diff --git a/src/libfourcc/lib.rs b/src/libfourcc/lib.rs
index 270416305dd1c..c465c8f1e1608 100644
--- a/src/libfourcc/lib.rs
+++ b/src/libfourcc/lib.rs
@@ -131,7 +131,11 @@ struct Ident {
 }
 
 fn parse_tts(cx: &ExtCtxt, tts: &[ast::TokenTree]) -> (@ast::Expr, Option<Ident>) {
-    let p = &mut parse::new_parser_from_tts(cx.parse_sess(), cx.cfg(), tts.to_owned());
+    let p = &mut parse::new_parser_from_tts(cx.parse_sess(),
+                                            cx.cfg(),
+                                            tts.iter()
+                                               .map(|x| (*x).clone())
+                                               .collect());
     let ex = p.parse_expr();
     let id = if p.token == token::EOF {
         None
@@ -151,7 +155,7 @@ fn parse_tts(cx: &ExtCtxt, tts: &[ast::TokenTree]) -> (@ast::Expr, Option<Ident>
 fn target_endian_little(cx: &ExtCtxt, sp: Span) -> bool {
     let meta = cx.meta_name_value(sp, InternedString::new("target_endian"),
         ast::LitStr(InternedString::new("little"), ast::CookedStr));
-    contains(cx.cfg(), meta)
+    contains(cx.cfg().as_slice(), meta)
 }
 
 // FIXME (10872): This is required to prevent an LLVM assert on Windows
diff --git a/src/librustc/back/link.rs b/src/librustc/back/link.rs
index bacc98a01356a..4d86848482e8d 100644
--- a/src/librustc/back/link.rs
+++ b/src/librustc/back/link.rs
@@ -519,7 +519,7 @@ pub fn crate_id_hash(crate_id: &CrateId) -> ~str {
 pub fn build_link_meta(krate: &ast::Crate,
                        output: &OutputFilenames) -> LinkMeta {
     let r = LinkMeta {
-        crateid: find_crate_id(krate.attrs, output),
+        crateid: find_crate_id(krate.attrs.as_slice(), output),
         crate_hash: Svh::calculate(krate),
     };
     info!("{}", r);
diff --git a/src/librustc/driver/driver.rs b/src/librustc/driver/driver.rs
index cd7d39e468810..88526dd15a913 100644
--- a/src/librustc/driver/driver.rs
+++ b/src/librustc/driver/driver.rs
@@ -35,6 +35,8 @@ use std::io::fs;
 use std::io::MemReader;
 use std::os;
 use std::vec;
+use std::vec_ng::Vec;
+use std::vec_ng;
 use collections::{HashMap, HashSet};
 use getopts::{optopt, optmulti, optflag, optflagopt};
 use getopts;
@@ -101,15 +103,15 @@ pub fn default_configuration(sess: Session) ->
     };
 
     let mk = attr::mk_name_value_item_str;
-    return ~[ // Target bindings.
+    return vec!(// Target bindings.
          attr::mk_word_item(fam.clone()),
          mk(InternedString::new("target_os"), tos),
          mk(InternedString::new("target_family"), fam),
          mk(InternedString::new("target_arch"), InternedString::new(arch)),
          mk(InternedString::new("target_endian"), InternedString::new(end)),
          mk(InternedString::new("target_word_size"),
-            InternedString::new(wordsz)),
-    ];
+            InternedString::new(wordsz))
+    );
 }
 
 pub fn append_configuration(cfg: &mut ast::CrateConfig,
@@ -119,8 +121,7 @@ pub fn append_configuration(cfg: &mut ast::CrateConfig,
     }
 }
 
-pub fn build_configuration(sess: Session) ->
-   ast::CrateConfig {
+pub fn build_configuration(sess: Session) -> ast::CrateConfig {
     // Combine the configuration requested by the session (command line) with
     // some default and generated configuration items
     let default_cfg = default_configuration(sess);
@@ -135,7 +136,8 @@ pub fn build_configuration(sess: Session) ->
     } else {
         InternedString::new("nogc")
     });
-    return vec::append(user_cfg, default_cfg);
+    return vec_ng::append(user_cfg.move_iter().collect(),
+                          default_cfg.as_slice());
 }
 
 // Convert strings provided as --cfg [cfgspec] into a crate_cfg
@@ -143,7 +145,10 @@ fn parse_cfgspecs(cfgspecs: ~[~str])
                   -> ast::CrateConfig {
     cfgspecs.move_iter().map(|s| {
         let sess = parse::new_parse_sess();
-        parse::parse_meta_from_source_str("cfgspec".to_str(), s, ~[], sess)
+        parse::parse_meta_from_source_str("cfgspec".to_str(),
+                                          s,
+                                          Vec::new(),
+                                          sess)
     }).collect::<ast::CrateConfig>()
 }
 
@@ -193,7 +198,9 @@ pub fn phase_2_configure_and_expand(sess: Session,
     let time_passes = sess.time_passes();
 
     sess.building_library.set(session::building_library(sess.opts, &krate));
-    sess.crate_types.set(session::collect_crate_types(&sess, krate.attrs));
+    sess.crate_types.set(session::collect_crate_types(&sess,
+                                                      krate.attrs
+                                                           .as_slice()));
 
     time(time_passes, "gated feature checking", (), |_|
          front::feature_gate::check_crate(sess, &krate));
@@ -472,7 +479,7 @@ fn write_out_deps(sess: Session,
                   input: &Input,
                   outputs: &OutputFilenames,
                   krate: &ast::Crate) -> io::IoResult<()> {
-    let id = link::find_crate_id(krate.attrs, outputs);
+    let id = link::find_crate_id(krate.attrs.as_slice(), outputs);
 
     let mut out_filenames = ~[];
     for output_type in sess.opts.output_types.iter() {
@@ -546,8 +553,11 @@ pub fn compile_input(sess: Session, cfg: ast::CrateConfig, input: &Input,
             let loader = &mut Loader::new(sess);
             phase_2_configure_and_expand(sess, loader, krate)
         };
-        let outputs = build_output_filenames(input, outdir, output,
-                                             expanded_crate.attrs, sess);
+        let outputs = build_output_filenames(input,
+                                             outdir,
+                                             output,
+                                             expanded_crate.attrs.as_slice(),
+                                             sess);
 
         write_out_deps(sess, input, &outputs, &expanded_crate).unwrap();
 
@@ -1180,7 +1190,7 @@ mod test {
         let sessopts = build_session_options(matches);
         let sess = build_session(sessopts, None);
         let cfg = build_configuration(sess);
-        assert!((attr::contains_name(cfg, "test")));
+        assert!((attr::contains_name(cfg.as_slice(), "test")));
     }
 
     // When the user supplies --test and --cfg test, don't implicitly add
diff --git a/src/librustc/driver/session.rs b/src/librustc/driver/session.rs
index 9a33c54d50f2b..d404360bf1499 100644
--- a/src/librustc/driver/session.rs
+++ b/src/librustc/driver/session.rs
@@ -27,6 +27,7 @@ use syntax::{abi, ast, codemap};
 use syntax;
 
 use std::cell::{Cell, RefCell};
+use std::vec_ng::Vec;
 use collections::{HashMap,HashSet};
 
 pub struct Config {
@@ -319,7 +320,7 @@ pub fn basic_options() -> @Options {
         addl_lib_search_paths: @RefCell::new(HashSet::new()),
         maybe_sysroot: None,
         target_triple: host_triple(),
-        cfg: ~[],
+        cfg: Vec::new(),
         test: false,
         parse_only: false,
         no_trans: false,
@@ -451,7 +452,8 @@ pub fn building_library(options: &Options, krate: &ast::Crate) -> bool {
             CrateTypeStaticlib | CrateTypeDylib | CrateTypeRlib => return true
         }
     }
-    match syntax::attr::first_attr_value_str_by_name(krate.attrs, "crate_type") {
+    match syntax::attr::first_attr_value_str_by_name(krate.attrs.as_slice(),
+                                                     "crate_type") {
         Some(s) => {
             s.equiv(&("lib")) ||
             s.equiv(&("rlib")) ||
diff --git a/src/librustc/front/config.rs b/src/librustc/front/config.rs
index f2130033eed92..26d72f843515e 100644
--- a/src/librustc/front/config.rs
+++ b/src/librustc/front/config.rs
@@ -21,7 +21,7 @@ struct Context<'a> {
 // any items that do not belong in the current configuration
 pub fn strip_unconfigured_items(krate: ast::Crate) -> ast::Crate {
     let config = krate.config.clone();
-    strip_items(krate, |attrs| in_cfg(config, attrs))
+    strip_items(krate, |attrs| in_cfg(config.as_slice(), attrs))
 }
 
 impl<'a> fold::Folder for Context<'a> {
@@ -117,7 +117,7 @@ fn fold_item_underscore(cx: &mut Context, item: &ast::Item_) -> ast::Item_ {
         ast::ItemEnum(ref def, ref generics) => {
             let mut variants = def.variants.iter().map(|c| c.clone()).
             filter_map(|v| {
-                if !(cx.in_cfg)(v.node.attrs) {
+                if !(cx.in_cfg)(v.node.attrs.as_slice()) {
                     None
                 } else {
                     Some(match v.node.kind {
@@ -147,7 +147,7 @@ fn fold_item_underscore(cx: &mut Context, item: &ast::Item_) -> ast::Item_ {
 
 fn fold_struct(cx: &Context, def: &ast::StructDef) -> @ast::StructDef {
     let mut fields = def.fields.iter().map(|c| c.clone()).filter(|m| {
-        (cx.in_cfg)(m.node.attrs)
+        (cx.in_cfg)(m.node.attrs.as_slice())
     });
     @ast::StructDef {
         fields: fields.collect(),
@@ -189,25 +189,25 @@ fn fold_block(cx: &mut Context, b: ast::P<ast::Block>) -> ast::P<ast::Block> {
 }
 
 fn item_in_cfg(cx: &Context, item: &ast::Item) -> bool {
-    return (cx.in_cfg)(item.attrs);
+    return (cx.in_cfg)(item.attrs.as_slice());
 }
 
 fn foreign_item_in_cfg(cx: &Context, item: &ast::ForeignItem) -> bool {
-    return (cx.in_cfg)(item.attrs);
+    return (cx.in_cfg)(item.attrs.as_slice());
 }
 
 fn view_item_in_cfg(cx: &Context, item: &ast::ViewItem) -> bool {
-    return (cx.in_cfg)(item.attrs);
+    return (cx.in_cfg)(item.attrs.as_slice());
 }
 
 fn method_in_cfg(cx: &Context, meth: &ast::Method) -> bool {
-    return (cx.in_cfg)(meth.attrs);
+    return (cx.in_cfg)(meth.attrs.as_slice());
 }
 
 fn trait_method_in_cfg(cx: &Context, meth: &ast::TraitMethod) -> bool {
     match *meth {
-        ast::Required(ref meth) => (cx.in_cfg)(meth.attrs),
-        ast::Provided(meth) => (cx.in_cfg)(meth.attrs)
+        ast::Required(ref meth) => (cx.in_cfg)(meth.attrs.as_slice()),
+        ast::Provided(meth) => (cx.in_cfg)(meth.attrs.as_slice())
     }
 }
 
diff --git a/src/librustc/front/feature_gate.rs b/src/librustc/front/feature_gate.rs
index 4450fbb04a931..b0a901f30be65 100644
--- a/src/librustc/front/feature_gate.rs
+++ b/src/librustc/front/feature_gate.rs
@@ -171,7 +171,7 @@ impl Visitor<()> for Context {
             }
 
             ast::ItemForeignMod(..) => {
-                if attr::contains_name(i.attrs, "link_args") {
+                if attr::contains_name(i.attrs.as_slice(), "link_args") {
                     self.gate_feature("link_args", i.span,
                                       "the `link_args` attribute is not portable \
                                        across platforms, it is recommended to \
@@ -180,7 +180,7 @@ impl Visitor<()> for Context {
             }
 
             ast::ItemFn(..) => {
-                if attr::contains_name(i.attrs, "macro_registrar") {
+                if attr::contains_name(i.attrs.as_slice(), "macro_registrar") {
                     self.gate_feature("macro_registrar", i.span,
                                       "cross-crate macro exports are \
                                        experimental and possibly buggy");
@@ -188,7 +188,7 @@ impl Visitor<()> for Context {
             }
 
             ast::ItemStruct(..) => {
-                if attr::contains_name(i.attrs, "simd") {
+                if attr::contains_name(i.attrs.as_slice(), "simd") {
                     self.gate_feature("simd", i.span,
                                       "SIMD types are experimental and possibly buggy");
                 }
diff --git a/src/librustc/front/std_inject.rs b/src/librustc/front/std_inject.rs
index f4bc1c1906353..eec44cc31b1a3 100644
--- a/src/librustc/front/std_inject.rs
+++ b/src/librustc/front/std_inject.rs
@@ -11,7 +11,8 @@
 
 use driver::session::Session;
 
-use std::vec;
+use std::vec_ng::Vec;
+use std::vec_ng;
 use syntax::ast;
 use syntax::attr;
 use syntax::codemap::DUMMY_SP;
@@ -43,11 +44,11 @@ pub fn maybe_inject_prelude(sess: Session, krate: ast::Crate) -> ast::Crate {
 }
 
 fn use_std(krate: &ast::Crate) -> bool {
-    !attr::contains_name(krate.attrs, "no_std")
+    !attr::contains_name(krate.attrs.as_slice(), "no_std")
 }
 
 fn use_uv(krate: &ast::Crate) -> bool {
-    !attr::contains_name(krate.attrs, "no_uv")
+    !attr::contains_name(krate.attrs.as_slice(), "no_uv")
 }
 
 fn no_prelude(attrs: &[ast::Attribute]) -> bool {
@@ -72,28 +73,27 @@ pub fn with_version(krate: &str) -> Option<(InternedString, ast::StrStyle)> {
 
 impl fold::Folder for StandardLibraryInjector {
     fn fold_crate(&mut self, krate: ast::Crate) -> ast::Crate {
-        let mut vis = ~[ast::ViewItem {
+        let mut vis = vec!(ast::ViewItem {
             node: ast::ViewItemExternMod(token::str_to_ident("std"),
                                          with_version("std"),
                                          ast::DUMMY_NODE_ID),
-            attrs: ~[
+            attrs: vec!(
                 attr::mk_attr(attr::mk_list_item(
                         InternedString::new("phase"),
-                        ~[
+                        vec!(
                             attr::mk_word_item(InternedString::new("syntax")),
                             attr::mk_word_item(InternedString::new("link")
-                        )]))
-            ],
+                        ))))),
             vis: ast::Inherited,
             span: DUMMY_SP
-        }];
+        });
 
         if use_uv(&krate) && !self.sess.building_library.get() {
             vis.push(ast::ViewItem {
                 node: ast::ViewItemExternMod(token::str_to_ident("green"),
                                              with_version("green"),
                                              ast::DUMMY_NODE_ID),
-                attrs: ~[],
+                attrs: Vec::new(),
                 vis: ast::Inherited,
                 span: DUMMY_SP
             });
@@ -101,13 +101,13 @@ impl fold::Folder for StandardLibraryInjector {
                 node: ast::ViewItemExternMod(token::str_to_ident("rustuv"),
                                              with_version("rustuv"),
                                              ast::DUMMY_NODE_ID),
-                attrs: ~[],
+                attrs: Vec::new(),
                 vis: ast::Inherited,
                 span: DUMMY_SP
             });
         }
 
-        vis.push_all(krate.module.view_items);
+        vis.push_all_move(krate.module.view_items.clone());
         let new_module = ast::Mod {
             view_items: vis,
             ..krate.module.clone()
@@ -134,7 +134,7 @@ struct PreludeInjector {
 
 impl fold::Folder for PreludeInjector {
     fn fold_crate(&mut self, krate: ast::Crate) -> ast::Crate {
-        if !no_prelude(krate.attrs) {
+        if !no_prelude(krate.attrs.as_slice()) {
             // only add `use std::prelude::*;` if there wasn't a
             // `#[no_implicit_prelude];` at the crate level.
             ast::Crate {
@@ -147,7 +147,7 @@ impl fold::Folder for PreludeInjector {
     }
 
     fn fold_item(&mut self, item: @ast::Item) -> SmallVector<@ast::Item> {
-        if !no_prelude(item.attrs) {
+        if !no_prelude(item.attrs.as_slice()) {
             // only recur if there wasn't `#[no_implicit_prelude];`
             // on this item, i.e. this means that the prelude is not
             // implicitly imported though the whole subtree
@@ -161,7 +161,7 @@ impl fold::Folder for PreludeInjector {
         let prelude_path = ast::Path {
             span: DUMMY_SP,
             global: false,
-            segments: ~[
+            segments: vec!(
                 ast::PathSegment {
                     identifier: token::str_to_ident("std"),
                     lifetimes: opt_vec::Empty,
@@ -171,19 +171,18 @@ impl fold::Folder for PreludeInjector {
                     identifier: token::str_to_ident("prelude"),
                     lifetimes: opt_vec::Empty,
                     types: opt_vec::Empty,
-                },
-            ],
+                }),
         };
 
         let vp = @codemap::dummy_spanned(ast::ViewPathGlob(prelude_path, ast::DUMMY_NODE_ID));
         let vi2 = ast::ViewItem {
-            node: ast::ViewItemUse(~[vp]),
-            attrs: ~[],
+            node: ast::ViewItemUse(vec!(vp)),
+            attrs: Vec::new(),
             vis: ast::Inherited,
             span: DUMMY_SP,
         };
 
-        let vis = vec::append(~[vi2], module.view_items);
+        let vis = vec_ng::append(vec!(vi2), module.view_items.as_slice());
 
         // FIXME #2543: Bad copy.
         let new_module = ast::Mod {
diff --git a/src/librustc/front/test.rs b/src/librustc/front/test.rs
index 45b1a42898c2a..333504b7e8247 100644
--- a/src/librustc/front/test.rs
+++ b/src/librustc/front/test.rs
@@ -10,6 +10,8 @@
 
 // Code that generates a test runner to run all the tests in a crate
 
+#[allow(dead_code)];
+#[allow(unused_imports)];
 
 use driver::session;
 use front::config;
@@ -18,6 +20,8 @@ use metadata::creader::Loader;
 
 use std::cell::RefCell;
 use std::vec;
+use std::vec_ng::Vec;
+use std::vec_ng;
 use syntax::ast_util::*;
 use syntax::attr::AttrMetaMethods;
 use syntax::attr;
@@ -57,7 +61,7 @@ pub fn modify_for_testing(sess: session::Session,
     // We generate the test harness when building in the 'test'
     // configuration, either with the '--test' or '--cfg test'
     // command line options.
-    let should_test = attr::contains_name(krate.config, "test");
+    let should_test = attr::contains_name(krate.config.as_slice(), "test");
 
     if should_test {
         generate_test_harness(sess, krate)
@@ -189,13 +193,13 @@ fn strip_test_functions(krate: ast::Crate) -> ast::Crate {
     // When not compiling with --test we should not compile the
     // #[test] functions
     config::strip_items(krate, |attrs| {
-        !attr::contains_name(attrs, "test") &&
-        !attr::contains_name(attrs, "bench")
+        !attr::contains_name(attrs.as_slice(), "test") &&
+        !attr::contains_name(attrs.as_slice(), "bench")
     })
 }
 
 fn is_test_fn(cx: &TestCtxt, i: @ast::Item) -> bool {
-    let has_test_attr = attr::contains_name(i.attrs, "test");
+    let has_test_attr = attr::contains_name(i.attrs.as_slice(), "test");
 
     fn has_test_signature(i: @ast::Item) -> bool {
         match &i.node {
@@ -224,7 +228,7 @@ fn is_test_fn(cx: &TestCtxt, i: @ast::Item) -> bool {
 }
 
 fn is_bench_fn(i: @ast::Item) -> bool {
-    let has_bench_attr = attr::contains_name(i.attrs, "bench");
+    let has_bench_attr = attr::contains_name(i.attrs.as_slice(), "bench");
 
     fn has_test_signature(i: @ast::Item) -> bool {
         match i.node {
@@ -251,20 +255,22 @@ fn is_ignored(cx: &TestCtxt, i: @ast::Item) -> bool {
     i.attrs.iter().any(|attr| {
         // check ignore(cfg(foo, bar))
         attr.name().equiv(&("ignore")) && match attr.meta_item_list() {
-            Some(ref cfgs) => attr::test_cfg(cx.config, cfgs.iter().map(|x| *x)),
+            Some(ref cfgs) => {
+                attr::test_cfg(cx.config.as_slice(), cfgs.iter().map(|x| *x))
+            }
             None => true
         }
     })
 }
 
 fn should_fail(i: @ast::Item) -> bool {
-    attr::contains_name(i.attrs, "should_fail")
+    attr::contains_name(i.attrs.as_slice(), "should_fail")
 }
 
 fn add_test_module(cx: &TestCtxt, m: &ast::Mod) -> ast::Mod {
     let testmod = mk_test_module(cx);
     ast::Mod {
-        items: vec::append_one(m.items.clone(), testmod),
+        items: vec_ng::append_one(m.items.clone(), testmod),
         ..(*m).clone()
     }
 }
@@ -291,9 +297,9 @@ fn mk_std(cx: &TestCtxt) -> ast::ViewItem {
     let id_test = token::str_to_ident("test");
     let vi = if cx.is_test_crate {
         ast::ViewItemUse(
-            ~[@nospan(ast::ViewPathSimple(id_test,
-                                          path_node(~[id_test]),
-                                          ast::DUMMY_NODE_ID))])
+            vec!(@nospan(ast::ViewPathSimple(id_test,
+                                             path_node(~[id_test]),
+                                             ast::DUMMY_NODE_ID))))
     } else {
         ast::ViewItemExternMod(id_test,
                                with_version("test"),
@@ -301,16 +307,21 @@ fn mk_std(cx: &TestCtxt) -> ast::ViewItem {
     };
     ast::ViewItem {
         node: vi,
-        attrs: ~[],
+        attrs: Vec::new(),
         vis: ast::Inherited,
         span: DUMMY_SP
     }
 }
 
-fn mk_test_module(cx: &TestCtxt) -> @ast::Item {
+#[cfg(stage0)]
+fn mk_test_module(_: &TestCtxt) -> @ast::Item {
+    fail!("test disabled in this stage due to quasiquoter")
+}
 
+#[cfg(not(stage0))]
+fn mk_test_module(cx: &TestCtxt) -> @ast::Item {
     // Link to test crate
-    let view_items = ~[mk_std(cx)];
+    let view_items = vec!(mk_std(cx));
 
     // A constant vector of test descriptors.
     let tests = mk_tests(cx);
@@ -326,7 +337,7 @@ fn mk_test_module(cx: &TestCtxt) -> @ast::Item {
 
     let testmod = ast::Mod {
         view_items: view_items,
-        items: ~[mainfn, tests],
+        items: vec!(mainfn, tests),
     };
     let item_ = ast::ItemMod(testmod);
 
@@ -337,7 +348,7 @@ fn mk_test_module(cx: &TestCtxt) -> @ast::Item {
 
     let item = ast::Item {
         ident: token::str_to_ident("__test"),
-        attrs: ~[resolve_unexported_attr],
+        attrs: vec!(resolve_unexported_attr),
         id: ast::DUMMY_NODE_ID,
         node: item_,
         vis: ast::Public,
@@ -377,6 +388,12 @@ fn path_node_global(ids: ~[ast::Ident]) -> ast::Path {
     }
 }
 
+#[cfg(stage0)]
+fn mk_tests(_: &TestCtxt) -> @ast::Item {
+    fail!("tests disabled in this stage due to quasiquoter")
+}
+
+#[cfg(not(stage0))]
 fn mk_tests(cx: &TestCtxt) -> @ast::Item {
     // The vector of test_descs for this crate
     let test_descs = mk_test_descs(cx);
@@ -389,14 +406,14 @@ fn mk_tests(cx: &TestCtxt) -> @ast::Item {
 }
 
 fn is_test_crate(krate: &ast::Crate) -> bool {
-    match attr::find_crateid(krate.attrs) {
+    match attr::find_crateid(krate.attrs.as_slice()) {
         Some(ref s) if "test" == s.name => true,
         _ => false
     }
 }
 
 fn mk_test_descs(cx: &TestCtxt) -> @ast::Expr {
-    let mut descs = ~[];
+    let mut descs = Vec::new();
     {
         let testfns = cx.testfns.borrow();
         debug!("building test vector from {} tests", testfns.get().len());
@@ -418,6 +435,12 @@ fn mk_test_descs(cx: &TestCtxt) -> @ast::Expr {
     }
 }
 
+#[cfg(stage0)]
+fn mk_test_desc_and_fn_rec(_: &TestCtxt, _: &Test) -> @ast::Expr {
+    fail!("tests disabled in this stage due to quasiquoter")
+}
+
+#[cfg(not(stage0))]
 fn mk_test_desc_and_fn_rec(cx: &TestCtxt, test: &Test) -> @ast::Expr {
     let span = test.span;
     let path = test.path.clone();
diff --git a/src/librustc/lib.rs b/src/librustc/lib.rs
index 2e3b9be5f9b86..235e1c72455c2 100644
--- a/src/librustc/lib.rs
+++ b/src/librustc/lib.rs
@@ -54,6 +54,7 @@ use std::os;
 use std::str;
 use std::task;
 use std::vec;
+use std::vec_ng::Vec;
 use syntax::ast;
 use syntax::diagnostic::Emitter;
 use syntax::diagnostic;
@@ -334,19 +335,22 @@ pub fn run_compiler(args: &[~str]) {
     d::compile_input(sess, cfg, &input, &odir, &ofile);
 }
 
-fn parse_crate_attrs(sess: session::Session,
-                     input: &d::Input) -> ~[ast::Attribute] {
-    match *input {
+fn parse_crate_attrs(sess: session::Session, input: &d::Input) ->
+                     ~[ast::Attribute] {
+    let result = match *input {
         d::FileInput(ref ifile) => {
-            parse::parse_crate_attrs_from_file(ifile, ~[], sess.parse_sess)
+            parse::parse_crate_attrs_from_file(ifile,
+                                               Vec::new(),
+                                               sess.parse_sess)
         }
         d::StrInput(ref src) => {
             parse::parse_crate_attrs_from_source_str(d::anon_src(),
                                                      (*src).clone(),
-                                                     ~[],
+                                                     Vec::new(),
                                                      sess.parse_sess)
         }
-    }
+    };
+    result.move_iter().collect()
 }
 
 /// Run a procedure which will detect failures in the compiler and print nicer
diff --git a/src/librustc/metadata/creader.rs b/src/librustc/metadata/creader.rs
index 165c1abdeedfa..58268d1169b2f 100644
--- a/src/librustc/metadata/creader.rs
+++ b/src/librustc/metadata/creader.rs
@@ -23,6 +23,7 @@ use metadata::loader;
 use metadata::loader::Os;
 
 use std::cell::RefCell;
+use std::vec_ng::Vec;
 use collections::HashMap;
 use syntax::ast;
 use syntax::abi;
@@ -140,7 +141,7 @@ fn visit_view_item(e: &mut Env, i: &ast::ViewItem) {
     let should_load = i.attrs.iter().all(|attr| {
         attr.name().get() != "phase" ||
             attr.meta_item_list().map_or(false, |phases| {
-                attr::contains_name(phases, "link")
+                attr::contains_name(phases.as_slice(), "link")
             })
     });
 
@@ -420,8 +421,9 @@ impl CrateLoader for Loader {
         }
     }
 
-    fn get_exported_macros(&mut self, cnum: ast::CrateNum) -> ~[~str] {
-        csearch::get_exported_macros(self.env.sess.cstore, cnum)
+    fn get_exported_macros(&mut self, cnum: ast::CrateNum) -> Vec<~str> {
+        csearch::get_exported_macros(self.env.sess.cstore, cnum).move_iter()
+                                                                .collect()
     }
 
     fn get_registrar_symbol(&mut self, cnum: ast::CrateNum) -> Option<~str> {
diff --git a/src/librustc/metadata/decoder.rs b/src/librustc/metadata/decoder.rs
index 42754aedba704..7e5c20fae65eb 100644
--- a/src/librustc/metadata/decoder.rs
+++ b/src/librustc/metadata/decoder.rs
@@ -1057,7 +1057,7 @@ fn get_meta_items(md: ebml::Doc) -> ~[@ast::MetaItem] {
         let nd = reader::get_doc(meta_item_doc, tag_meta_item_name);
         let n = token::intern_and_get_ident(nd.as_str_slice());
         let subitems = get_meta_items(meta_item_doc);
-        items.push(attr::mk_list_item(n, subitems));
+        items.push(attr::mk_list_item(n, subitems.move_iter().collect()));
         true
     });
     return items;
diff --git a/src/librustc/metadata/encoder.rs b/src/librustc/metadata/encoder.rs
index 5bcc113ef946b..3a490845c6098 100644
--- a/src/librustc/metadata/encoder.rs
+++ b/src/librustc/metadata/encoder.rs
@@ -349,7 +349,7 @@ fn encode_enum_variant_info(ecx: &EncodeContext,
         encode_name(ebml_w, variant.node.name.name);
         encode_parent_item(ebml_w, local_def(id));
         encode_visibility(ebml_w, variant.node.vis);
-        encode_attributes(ebml_w, variant.node.attrs);
+        encode_attributes(ebml_w, variant.node.attrs.as_slice());
         match variant.node.kind {
             ast::TupleVariantKind(ref args)
                     if args.len() > 0 && generics.ty_params.len() == 0 => {
@@ -357,7 +357,10 @@ fn encode_enum_variant_info(ecx: &EncodeContext,
             }
             ast::TupleVariantKind(_) => {},
             ast::StructVariantKind(def) => {
-                let idx = encode_info_for_struct(ecx, ebml_w, def.fields, index);
+                let idx = encode_info_for_struct(ecx,
+                                                 ebml_w,
+                                                 def.fields.as_slice(),
+                                                 index);
                 encode_struct_fields(ebml_w, def);
                 let bkts = create_index(idx);
                 encode_index(ebml_w, bkts, write_i64);
@@ -516,7 +519,7 @@ fn each_auxiliary_node_id(item: @Item, callback: |NodeId| -> bool) -> bool {
             // If this is a newtype struct, return the constructor.
             match struct_def.ctor_id {
                 Some(ctor_id) if struct_def.fields.len() > 0 &&
-                        struct_def.fields[0].node.kind ==
+                        struct_def.fields.get(0).node.kind ==
                         ast::UnnamedField => {
                     continue_ = callback(ctor_id);
                 }
@@ -799,13 +802,17 @@ fn encode_info_for_method(ecx: &EncodeContext,
     let elem = ast_map::PathName(m.ident.name);
     encode_path(ebml_w, impl_path.chain(Some(elem).move_iter()));
     match ast_method_opt {
-        Some(ast_method) => encode_attributes(ebml_w, ast_method.attrs),
+        Some(ast_method) => {
+            encode_attributes(ebml_w, ast_method.attrs.as_slice())
+        }
         None => ()
     }
 
     for &ast_method in ast_method_opt.iter() {
         let num_params = tpt.generics.type_param_defs().len();
-        if num_params > 0u || is_default_impl || should_inline(ast_method.attrs) {
+        if num_params > 0u ||
+                is_default_impl ||
+                should_inline(ast_method.attrs.as_slice()) {
             (ecx.encode_inlined_item)(
                 ecx, ebml_w, IIMethodRef(local_def(parent_id), false, ast_method));
         } else {
@@ -930,8 +937,8 @@ fn encode_info_for_item(ecx: &EncodeContext,
         encode_bounds_and_type(ebml_w, ecx, &lookup_item_type(tcx, def_id));
         encode_name(ebml_w, item.ident.name);
         encode_path(ebml_w, path);
-        encode_attributes(ebml_w, item.attrs);
-        if tps_len > 0u || should_inline(item.attrs) {
+        encode_attributes(ebml_w, item.attrs.as_slice());
+        if tps_len > 0u || should_inline(item.attrs.as_slice()) {
             (ecx.encode_inlined_item)(ecx, ebml_w, IIItemRef(item));
         } else {
             encode_symbol(ecx, ebml_w, item.id);
@@ -986,7 +993,7 @@ fn encode_info_for_item(ecx: &EncodeContext,
         encode_item_variances(ebml_w, ecx, item.id);
         encode_bounds_and_type(ebml_w, ecx, &lookup_item_type(tcx, def_id));
         encode_name(ebml_w, item.ident.name);
-        encode_attributes(ebml_w, item.attrs);
+        encode_attributes(ebml_w, item.attrs.as_slice());
         for v in (*enum_definition).variants.iter() {
             encode_variant_id(ebml_w, local_def(v.node.id));
         }
@@ -1002,7 +1009,7 @@ fn encode_info_for_item(ecx: &EncodeContext,
         encode_enum_variant_info(ecx,
                                  ebml_w,
                                  item.id,
-                                 (*enum_definition).variants,
+                                 (*enum_definition).variants.as_slice(),
                                  index,
                                  generics);
       }
@@ -1012,7 +1019,7 @@ fn encode_info_for_item(ecx: &EncodeContext,
            the index, and the index needs to be in the item for the
            class itself */
         let idx = encode_info_for_struct(ecx, ebml_w,
-                                         struct_def.fields, index);
+                                         struct_def.fields.as_slice(), index);
 
         /* Index the class*/
         add_to_index(item, ebml_w, index);
@@ -1025,7 +1032,7 @@ fn encode_info_for_item(ecx: &EncodeContext,
 
         encode_item_variances(ebml_w, ecx, item.id);
         encode_name(ebml_w, item.ident.name);
-        encode_attributes(ebml_w, item.attrs);
+        encode_attributes(ebml_w, item.attrs.as_slice());
         encode_path(ebml_w, path.clone());
         encode_visibility(ebml_w, vis);
 
@@ -1065,7 +1072,7 @@ fn encode_info_for_item(ecx: &EncodeContext,
         encode_family(ebml_w, 'i');
         encode_bounds_and_type(ebml_w, ecx, &lookup_item_type(tcx, def_id));
         encode_name(ebml_w, item.ident.name);
-        encode_attributes(ebml_w, item.attrs);
+        encode_attributes(ebml_w, item.attrs.as_slice());
         match ty.node {
             ast::TyPath(ref path, ref bounds, _) if path.segments
                                                         .len() == 1 => {
@@ -1097,7 +1104,7 @@ fn encode_info_for_item(ecx: &EncodeContext,
         let num_implemented_methods = ast_methods.len();
         for (i, m) in imp.methods.iter().enumerate() {
             let ast_method = if i < num_implemented_methods {
-                Some(ast_methods[i])
+                Some(*ast_methods.get(i))
             } else { None };
 
             {
@@ -1129,7 +1136,7 @@ fn encode_info_for_item(ecx: &EncodeContext,
         encode_region_param_defs(ebml_w, trait_def.generics.region_param_defs());
         encode_trait_ref(ebml_w, ecx, trait_def.trait_ref, tag_item_trait_ref);
         encode_name(ebml_w, item.ident.name);
-        encode_attributes(ebml_w, item.attrs);
+        encode_attributes(ebml_w, item.attrs.as_slice());
         encode_visibility(ebml_w, vis);
         for &method_def_id in ty::trait_method_def_ids(tcx, def_id).iter() {
             ebml_w.start_tag(tag_item_trait_method);
@@ -1195,14 +1202,14 @@ fn encode_info_for_item(ecx: &EncodeContext,
                 }
             }
 
-            match ms[i] {
-                Required(ref tm) => {
-                    encode_attributes(ebml_w, tm.attrs);
+            match ms.get(i) {
+                &Required(ref tm) => {
+                    encode_attributes(ebml_w, tm.attrs.as_slice());
                     encode_method_sort(ebml_w, 'r');
                 }
 
-                Provided(m) => {
-                    encode_attributes(ebml_w, m.attrs);
+                &Provided(m) => {
+                    encode_attributes(ebml_w, m.attrs.as_slice());
                     // If this is a static method, we've already encoded
                     // this.
                     if method_ty.explicit_self != SelfStatic {
diff --git a/src/librustc/middle/astencode.rs b/src/librustc/middle/astencode.rs
index 0ab826fb1ad96..3fb127f470e97 100644
--- a/src/librustc/middle/astencode.rs
+++ b/src/librustc/middle/astencode.rs
@@ -36,6 +36,7 @@ use std::libc;
 use std::cast;
 use std::io::Seek;
 use std::rc::Rc;
+use std::vec_ng::Vec;
 
 use serialize::ebml::reader;
 use serialize::ebml;
@@ -334,8 +335,8 @@ impl Folder for NestedItemsDropper {
             }
         }).collect();
         let blk_sans_items = ast::P(ast::Block {
-            view_items: ~[], // I don't know if we need the view_items here,
-                             // but it doesn't break tests!
+            view_items: Vec::new(), // I don't know if we need the view_items
+                                    // here, but it doesn't break tests!
             stmts: stmts_sans_items,
             expr: blk.expr,
             id: blk.id,
@@ -396,7 +397,10 @@ fn renumber_and_map_ast(xcx: @ExtendedDecodeContext,
                         map: &ast_map::Map,
                         path: ~[ast_map::PathElem],
                         ii: ast::InlinedItem) -> ast::InlinedItem {
-    ast_map::map_decoded_item(map, path, AstRenumberer { xcx: xcx }, |fld| {
+    ast_map::map_decoded_item(map,
+                              path.move_iter().collect(),
+                              AstRenumberer { xcx: xcx },
+                              |fld| {
         match ii {
             ast::IIItem(i) => {
                 ast::IIItem(fld.fold_item(i).expect_one("expected one item"))
@@ -1436,7 +1440,9 @@ trait fake_ext_ctxt {
 
 #[cfg(test)]
 impl fake_ext_ctxt for @parse::ParseSess {
-    fn cfg(&self) -> ast::CrateConfig { ~[] }
+    fn cfg(&self) -> ast::CrateConfig {
+        Vec::new()
+    }
     fn parse_sess(&self) -> @parse::ParseSess { *self }
     fn call_site(&self) -> Span {
         codemap::Span {
diff --git a/src/librustc/middle/borrowck/check_loans.rs b/src/librustc/middle/borrowck/check_loans.rs
index f974b324f0564..3a500a82664dd 100644
--- a/src/librustc/middle/borrowck/check_loans.rs
+++ b/src/librustc/middle/borrowck/check_loans.rs
@@ -831,10 +831,10 @@ fn check_loans_in_expr<'a>(this: &mut CheckLoanCtxt<'a>,
         this.check_assignment(dest);
       }
       ast::ExprCall(f, ref args) => {
-        this.check_call(expr, Some(f), f.span, *args);
+        this.check_call(expr, Some(f), f.span, args.as_slice());
       }
       ast::ExprMethodCall(_, _, ref args) => {
-        this.check_call(expr, None, expr.span, *args);
+        this.check_call(expr, None, expr.span, args.as_slice());
       }
       ast::ExprIndex(_, rval) | ast::ExprBinary(_, _, rval)
       if method_map.get().contains_key(&expr.id) => {
diff --git a/src/librustc/middle/cfg/construct.rs b/src/librustc/middle/cfg/construct.rs
index 12853fe6742da..b76d4cb858903 100644
--- a/src/librustc/middle/cfg/construct.rs
+++ b/src/librustc/middle/cfg/construct.rs
@@ -298,7 +298,8 @@ impl CFGBuilder {
                 let mut guard_exit = discr_exit;
                 for arm in arms.iter() {
                     guard_exit = self.opt_expr(arm.guard, guard_exit); // 2
-                    let pats_exit = self.pats_any(arm.pats, guard_exit); // 3
+                    let pats_exit = self.pats_any(arm.pats.as_slice(),
+                                                  guard_exit); // 3
                     let body_exit = self.block(arm.body, pats_exit);    // 4
                     self.add_contained_edge(body_exit, expr_exit);       // 5
                 }
@@ -348,15 +349,15 @@ impl CFGBuilder {
             }
 
             ast::ExprVec(ref elems, _) => {
-                self.straightline(expr, pred, *elems)
+                self.straightline(expr, pred, elems.as_slice())
             }
 
             ast::ExprCall(func, ref args) => {
-                self.call(expr, pred, func, *args)
+                self.call(expr, pred, func, args.as_slice())
             }
 
             ast::ExprMethodCall(_, _, ref args) => {
-                self.call(expr, pred, args[0], args.slice_from(1))
+                self.call(expr, pred, *args.get(0), args.slice_from(1))
             }
 
             ast::ExprIndex(l, r) |
@@ -369,7 +370,7 @@ impl CFGBuilder {
             }
 
             ast::ExprTup(ref exprs) => {
-                self.straightline(expr, pred, *exprs)
+                self.straightline(expr, pred, exprs.as_slice())
             }
 
             ast::ExprStruct(_, ref fields, base) => {
diff --git a/src/librustc/middle/check_match.rs b/src/librustc/middle/check_match.rs
index 7292633eec081..0ca5ad8b44c5a 100644
--- a/src/librustc/middle/check_match.rs
+++ b/src/librustc/middle/check_match.rs
@@ -76,10 +76,10 @@ fn check_expr(v: &mut CheckMatchVisitor,
         for arm in arms.iter() {
             check_legality_of_move_bindings(cx,
                                             arm.guard.is_some(),
-                                            arm.pats);
+                                            arm.pats.as_slice());
         }
 
-        check_arms(cx, *arms);
+        check_arms(cx, arms.as_slice());
         /* Check for exhaustiveness */
          // Check for empty enum, because is_useful only works on inhabited
          // types.
@@ -104,11 +104,15 @@ fn check_expr(v: &mut CheckMatchVisitor,
           }
           _ => { /* We assume only enum types can be uninhabited */ }
        }
-       let arms = arms.iter().filter_map(unguarded_pat).collect::<~[~[@Pat]]>().concat_vec();
-       if arms.is_empty() {
+
+       let pats: ~[@Pat] = arms.iter()
+                               .filter_map(unguarded_pat)
+                               .flat_map(|pats| pats.move_iter())
+                               .collect();
+       if pats.is_empty() {
            cx.tcx.sess.span_err(ex.span, "non-exhaustive patterns");
        } else {
-           check_exhaustive(cx, ex.span, arms);
+           check_exhaustive(cx, ex.span, pats);
        }
      }
      _ => ()
@@ -671,7 +675,7 @@ fn specialize(cx: &MatchCheckCtxt,
                     }
                     DefVariant(_, id, _) if variant(id) == *ctor_id => {
                         let args = match args {
-                            Some(args) => args,
+                            Some(args) => args.iter().map(|x| *x).collect(),
                             None => vec::from_elem(arity, wild())
                         };
                         Some(vec::append(args, r.tail()))
@@ -682,7 +686,9 @@ fn specialize(cx: &MatchCheckCtxt,
                     DefStruct(..) => {
                         let new_args;
                         match args {
-                            Some(args) => new_args = args,
+                            Some(args) => {
+                                new_args = args.iter().map(|x| *x).collect()
+                            }
                             None => new_args = vec::from_elem(arity, wild())
                         }
                         Some(vec::append(new_args, r.tail()))
@@ -741,7 +747,9 @@ fn specialize(cx: &MatchCheckCtxt,
                     }
                 }
             }
-            PatTup(args) => Some(vec::append(args, r.tail())),
+            PatTup(args) => {
+                Some(vec::append(args.iter().map(|x| *x).collect(), r.tail()))
+            }
             PatUniq(a) | PatRegion(a) => {
                 Some(vec::append(~[a], r.tail()))
             }
@@ -804,20 +812,32 @@ fn specialize(cx: &MatchCheckCtxt,
                     vec(_) => {
                         let num_elements = before.len() + after.len();
                         if num_elements < arity && slice.is_some() {
-                            Some(vec::append(
-                                [
-                                    before,
-                                    vec::from_elem(
-                                        arity - num_elements, wild()),
-                                    after
-                                ].concat_vec(),
-                                r.tail()
-                            ))
+                            let mut result = ~[];
+                            for pat in before.iter() {
+                                result.push((*pat).clone());
+                            }
+                            for _ in iter::range(0, arity - num_elements) {
+                                result.push(wild())
+                            }
+                            for pat in after.iter() {
+                                result.push((*pat).clone());
+                            }
+                            for pat in r.tail().iter() {
+                                result.push((*pat).clone());
+                            }
+                            Some(result)
                         } else if num_elements == arity {
-                            Some(vec::append(
-                                vec::append(before, after),
-                                r.tail()
-                            ))
+                            let mut result = ~[];
+                            for pat in before.iter() {
+                                result.push((*pat).clone());
+                            }
+                            for pat in after.iter() {
+                                result.push((*pat).clone());
+                            }
+                            for pat in r.tail().iter() {
+                                result.push((*pat).clone());
+                            }
+                            Some(result)
                         } else {
                             None
                         }
diff --git a/src/librustc/middle/const_eval.rs b/src/librustc/middle/const_eval.rs
index 0b516a7f05fcf..cd52f24b8eaee 100644
--- a/src/librustc/middle/const_eval.rs
+++ b/src/librustc/middle/const_eval.rs
@@ -117,7 +117,7 @@ pub fn lookup_variant_by_id(tcx: ty::ctxt,
                 None => None,
                 Some(ast_map::NodeItem(it)) => match it.node {
                     ItemEnum(ast::EnumDef { variants: ref variants }, _) => {
-                        variant_expr(*variants, variant_def.node)
+                        variant_expr(variants.as_slice(), variant_def.node)
                     }
                     _ => None
                 },
@@ -144,7 +144,7 @@ pub fn lookup_variant_by_id(tcx: ty::ctxt,
                                                         c, d)) {
             csearch::found(ast::IIItem(item)) => match item.node {
                 ItemEnum(ast::EnumDef { variants: ref variants }, _) => {
-                    variant_expr(*variants, variant_def.node)
+                    variant_expr(variants.as_slice(), variant_def.node)
                 }
                 _ => None
             },
@@ -509,7 +509,9 @@ pub fn eval_const_expr_partial<T: ty::ExprTyProvider>(tcx: &T, e: &Expr)
 pub fn lit_to_const(lit: &Lit) -> const_val {
     match lit.node {
         LitStr(ref s, _) => const_str((*s).clone()),
-        LitBinary(ref data) => const_binary(data.clone()),
+        LitBinary(ref data) => {
+            const_binary(Rc::new(data.borrow().iter().map(|x| *x).collect()))
+        }
         LitChar(n) => const_uint(n as u64),
         LitInt(n, _) => const_int(n),
         LitUint(n, _) => const_uint(n),
diff --git a/src/librustc/middle/dataflow.rs b/src/librustc/middle/dataflow.rs
index e81e6b0f96d2d..1e38f5d9bd7f5 100644
--- a/src/librustc/middle/dataflow.rs
+++ b/src/librustc/middle/dataflow.rs
@@ -531,7 +531,9 @@ impl<'a, O:DataFlowOperator> PropagationContext<'a, O> {
                     // determine the bits for the body and then union
                     // them into `in_out`, which reflects all bodies to date
                     let mut body = guards.to_owned();
-                    self.walk_pat_alternatives(arm.pats, body, loop_scopes);
+                    self.walk_pat_alternatives(arm.pats.as_slice(),
+                                               body,
+                                               loop_scopes);
                     self.walk_block(arm.body, body, loop_scopes);
                     join_bits(&self.dfcx.oper, body, in_out);
                 }
@@ -562,7 +564,7 @@ impl<'a, O:DataFlowOperator> PropagationContext<'a, O> {
             }
 
             ast::ExprVec(ref exprs, _) => {
-                self.walk_exprs(*exprs, in_out, loop_scopes)
+                self.walk_exprs(exprs.as_slice(), in_out, loop_scopes)
             }
 
             ast::ExprRepeat(l, r, _) => {
@@ -579,11 +581,11 @@ impl<'a, O:DataFlowOperator> PropagationContext<'a, O> {
 
             ast::ExprCall(f, ref args) => {
                 self.walk_expr(f, in_out, loop_scopes);
-                self.walk_call(expr.id, *args, in_out, loop_scopes);
+                self.walk_call(expr.id, args.as_slice(), in_out, loop_scopes);
             }
 
             ast::ExprMethodCall(_, _, ref args) => {
-                self.walk_call(expr.id, *args, in_out, loop_scopes);
+                self.walk_call(expr.id, args.as_slice(), in_out, loop_scopes);
             }
 
             ast::ExprIndex(l, r) |
@@ -596,7 +598,7 @@ impl<'a, O:DataFlowOperator> PropagationContext<'a, O> {
             }
 
             ast::ExprTup(ref exprs) => {
-                self.walk_exprs(*exprs, in_out, loop_scopes);
+                self.walk_exprs(exprs.as_slice(), in_out, loop_scopes);
             }
 
             ast::ExprBinary(op, l, r) if ast_util::lazy_binop(op) => {
diff --git a/src/librustc/middle/dead.rs b/src/librustc/middle/dead.rs
index 7d66c80dea08b..a0a34ff4f32b5 100644
--- a/src/librustc/middle/dead.rs
+++ b/src/librustc/middle/dead.rs
@@ -198,7 +198,7 @@ impl Visitor<()> for MarkSymbolVisitor {
 
 fn has_allow_dead_code_or_lang_attr(attrs: &[ast::Attribute]) -> bool {
     contains_lint(attrs, allow, DEAD_CODE_LINT_STR)
-    || attr::contains_name(attrs, "lang")
+    || attr::contains_name(attrs.as_slice(), "lang")
 }
 
 // This visitor seeds items that
@@ -220,7 +220,7 @@ struct LifeSeeder {
 
 impl Visitor<()> for LifeSeeder {
     fn visit_item(&mut self, item: &ast::Item, _: ()) {
-        if has_allow_dead_code_or_lang_attr(item.attrs) {
+        if has_allow_dead_code_or_lang_attr(item.attrs.as_slice()) {
             self.worklist.push(item.id);
         }
         match item.node {
@@ -240,7 +240,7 @@ impl Visitor<()> for LifeSeeder {
         // Check for method here because methods are not ast::Item
         match *fk {
             visit::FkMethod(_, _, method) => {
-                if has_allow_dead_code_or_lang_attr(method.attrs) {
+                if has_allow_dead_code_or_lang_attr(method.attrs.as_slice()) {
                     self.worklist.push(id);
                 }
             }
diff --git a/src/librustc/middle/entry.rs b/src/librustc/middle/entry.rs
index f6af8b86b5d45..2623ddb15297e 100644
--- a/src/librustc/middle/entry.rs
+++ b/src/librustc/middle/entry.rs
@@ -54,7 +54,7 @@ pub fn find_entry_point(session: Session, krate: &Crate, ast_map: &ast_map::Map)
     }
 
     // If the user wants no main function at all, then stop here.
-    if attr::contains_name(krate.attrs, "no_main") {
+    if attr::contains_name(krate.attrs.as_slice(), "no_main") {
         session.entry_type.set(Some(session::EntryNone));
         return
     }
@@ -95,7 +95,7 @@ fn find_item(item: &Item, ctxt: &mut EntryContext) {
                 });
             }
 
-            if attr::contains_name(item.attrs, "main") {
+            if attr::contains_name(item.attrs.as_slice(), "main") {
                 if ctxt.attr_main_fn.is_none() {
                     ctxt.attr_main_fn = Some((item.id, item.span));
                 } else {
@@ -105,7 +105,7 @@ fn find_item(item: &Item, ctxt: &mut EntryContext) {
                 }
             }
 
-            if attr::contains_name(item.attrs, "start") {
+            if attr::contains_name(item.attrs.as_slice(), "start") {
                 if ctxt.start_fn.is_none() {
                     ctxt.start_fn = Some((item.id, item.span));
                 } else {
diff --git a/src/librustc/middle/kind.rs b/src/librustc/middle/kind.rs
index 672a3e44ccba2..5b7ac704e2a22 100644
--- a/src/librustc/middle/kind.rs
+++ b/src/librustc/middle/kind.rs
@@ -160,7 +160,7 @@ fn check_impl_of_trait(cx: &mut Context, it: &Item, trait_ref: &TraitRef, self_t
 }
 
 fn check_item(cx: &mut Context, item: &Item) {
-    if !attr::contains_name(item.attrs, "unsafe_destructor") {
+    if !attr::contains_name(item.attrs.as_slice(), "unsafe_destructor") {
         match item.node {
             ItemImpl(_, Some(ref trait_ref), self_type, _) => {
                 check_impl_of_trait(cx, item, trait_ref, self_type);
diff --git a/src/librustc/middle/lang_items.rs b/src/librustc/middle/lang_items.rs
index 0194d4a251048..bedf8ed05290b 100644
--- a/src/librustc/middle/lang_items.rs
+++ b/src/librustc/middle/lang_items.rs
@@ -114,7 +114,7 @@ struct LanguageItemVisitor<'a> {
 
 impl<'a> Visitor<()> for LanguageItemVisitor<'a> {
     fn visit_item(&mut self, item: &ast::Item, _: ()) {
-        match extract(item.attrs) {
+        match extract(item.attrs.as_slice()) {
             Some(value) => {
                 let item_index = self.this.item_refs.find_equiv(&value).map(|x| *x);
 
diff --git a/src/librustc/middle/lint.rs b/src/librustc/middle/lint.rs
index 693f6fb35f4fc..cef32797ca268 100644
--- a/src/librustc/middle/lint.rs
+++ b/src/librustc/middle/lint.rs
@@ -548,7 +548,9 @@ impl<'a> Context<'a> {
                      attr.name().equiv(&("doc")) &&
                      match attr.meta_item_list() {
                          None => false,
-                         Some(l) => attr::contains_name(l, "hidden")
+                         Some(l) => {
+                             attr::contains_name(l.as_slice(), "hidden")
+                         }
                      }
                  });
 
@@ -1070,7 +1072,8 @@ fn check_unused_result(cx: &Context, s: &ast::Stmt) {
             if ast_util::is_local(did) {
                 match cx.tcx.map.get(did.node) {
                     ast_map::NodeItem(it) => {
-                        if attr::contains_name(it.attrs, "must_use") {
+                        if attr::contains_name(it.attrs.as_slice(),
+                                               "must_use") {
                             cx.span_lint(UnusedMustUse, s.span,
                                          "unused result which must be used");
                             warned = true;
@@ -1234,8 +1237,9 @@ fn check_unused_mut_pat(cx: &Context, p: &ast::Pat) {
                       ref path, _) if pat_util::pat_is_binding(cx.tcx.def_map, p)=> {
             // `let mut _a = 1;` doesn't need a warning.
             let initial_underscore = if path.segments.len() == 1 {
-                token::get_ident(path.segments[0].identifier).get()
-                                                             .starts_with("_")
+                token::get_ident(path.segments
+                                     .get(0)
+                                     .identifier).get().starts_with("_")
             } else {
                 cx.tcx.sess.span_bug(p.span,
                                      "mutable binding that doesn't consist \
@@ -1353,7 +1357,11 @@ fn check_missing_doc_item(cx: &Context, it: &ast::Item) {
         ast::ItemTrait(..) => "a trait",
         _ => return
     };
-    check_missing_doc_attrs(cx, Some(it.id), it.attrs, it.span, desc);
+    check_missing_doc_attrs(cx,
+                            Some(it.id),
+                            it.attrs.as_slice(),
+                            it.span,
+                            desc);
 }
 
 fn check_missing_doc_method(cx: &Context, m: &ast::Method) {
@@ -1386,24 +1394,39 @@ fn check_missing_doc_method(cx: &Context, m: &ast::Method) {
             }
         }
     }
-    check_missing_doc_attrs(cx, Some(m.id), m.attrs, m.span, "a method");
+    check_missing_doc_attrs(cx,
+                            Some(m.id),
+                            m.attrs.as_slice(),
+                            m.span,
+                            "a method");
 }
 
 fn check_missing_doc_ty_method(cx: &Context, tm: &ast::TypeMethod) {
-    check_missing_doc_attrs(cx, Some(tm.id), tm.attrs, tm.span, "a type method");
+    check_missing_doc_attrs(cx,
+                            Some(tm.id),
+                            tm.attrs.as_slice(),
+                            tm.span,
+                            "a type method");
 }
 
 fn check_missing_doc_struct_field(cx: &Context, sf: &ast::StructField) {
     match sf.node.kind {
         ast::NamedField(_, vis) if vis != ast::Private =>
-            check_missing_doc_attrs(cx, Some(cx.cur_struct_def_id), sf.node.attrs,
-                                    sf.span, "a struct field"),
+            check_missing_doc_attrs(cx,
+                                    Some(cx.cur_struct_def_id),
+                                    sf.node.attrs.as_slice(),
+                                    sf.span,
+                                    "a struct field"),
         _ => {}
     }
 }
 
 fn check_missing_doc_variant(cx: &Context, v: &ast::Variant) {
-    check_missing_doc_attrs(cx, Some(v.node.id), v.node.attrs, v.span, "a variant");
+    check_missing_doc_attrs(cx,
+                            Some(v.node.id),
+                            v.node.attrs.as_slice(),
+                            v.span,
+                            "a variant");
 }
 
 /// Checks for use of items with #[deprecated], #[experimental] and
@@ -1500,13 +1523,13 @@ fn check_stability(cx: &Context, e: &ast::Expr) {
 
 impl<'a> Visitor<()> for Context<'a> {
     fn visit_item(&mut self, it: &ast::Item, _: ()) {
-        self.with_lint_attrs(it.attrs, |cx| {
+        self.with_lint_attrs(it.attrs.as_slice(), |cx| {
             check_item_ctypes(cx, it);
             check_item_non_camel_case_types(cx, it);
             check_item_non_uppercase_statics(cx, it);
             check_heap_item(cx, it);
             check_missing_doc_item(cx, it);
-            check_attrs_usage(cx, it.attrs);
+            check_attrs_usage(cx, it.attrs.as_slice());
 
             cx.visit_ids(|v| v.visit_item(it, ()));
 
@@ -1515,15 +1538,15 @@ impl<'a> Visitor<()> for Context<'a> {
     }
 
     fn visit_foreign_item(&mut self, it: &ast::ForeignItem, _: ()) {
-        self.with_lint_attrs(it.attrs, |cx| {
-            check_attrs_usage(cx, it.attrs);
+        self.with_lint_attrs(it.attrs.as_slice(), |cx| {
+            check_attrs_usage(cx, it.attrs.as_slice());
             visit::walk_foreign_item(cx, it, ());
         })
     }
 
     fn visit_view_item(&mut self, i: &ast::ViewItem, _: ()) {
-        self.with_lint_attrs(i.attrs, |cx| {
-            check_attrs_usage(cx, i.attrs);
+        self.with_lint_attrs(i.attrs.as_slice(), |cx| {
+            check_attrs_usage(cx, i.attrs.as_slice());
             visit::walk_view_item(cx, i, ());
         })
     }
@@ -1579,9 +1602,9 @@ impl<'a> Visitor<()> for Context<'a> {
 
         match *fk {
             visit::FkMethod(_, _, m) => {
-                self.with_lint_attrs(m.attrs, |cx| {
+                self.with_lint_attrs(m.attrs.as_slice(), |cx| {
                     check_missing_doc_method(cx, m);
-                    check_attrs_usage(cx, m.attrs);
+                    check_attrs_usage(cx, m.attrs.as_slice());
 
                     cx.visit_ids(|v| {
                         v.visit_fn(fk, decl, body, span, id, ());
@@ -1595,9 +1618,9 @@ impl<'a> Visitor<()> for Context<'a> {
 
 
     fn visit_ty_method(&mut self, t: &ast::TypeMethod, _: ()) {
-        self.with_lint_attrs(t.attrs, |cx| {
+        self.with_lint_attrs(t.attrs.as_slice(), |cx| {
             check_missing_doc_ty_method(cx, t);
-            check_attrs_usage(cx, t.attrs);
+            check_attrs_usage(cx, t.attrs.as_slice());
 
             visit::walk_ty_method(cx, t, ());
         })
@@ -1616,18 +1639,18 @@ impl<'a> Visitor<()> for Context<'a> {
     }
 
     fn visit_struct_field(&mut self, s: &ast::StructField, _: ()) {
-        self.with_lint_attrs(s.node.attrs, |cx| {
+        self.with_lint_attrs(s.node.attrs.as_slice(), |cx| {
             check_missing_doc_struct_field(cx, s);
-            check_attrs_usage(cx, s.node.attrs);
+            check_attrs_usage(cx, s.node.attrs.as_slice());
 
             visit::walk_struct_field(cx, s, ());
         })
     }
 
     fn visit_variant(&mut self, v: &ast::Variant, g: &ast::Generics, _: ()) {
-        self.with_lint_attrs(v.node.attrs, |cx| {
+        self.with_lint_attrs(v.node.attrs.as_slice(), |cx| {
             check_missing_doc_variant(cx, v);
-            check_attrs_usage(cx, v.node.attrs);
+            check_attrs_usage(cx, v.node.attrs.as_slice());
 
             visit::walk_variant(cx, v, g, ());
         })
@@ -1675,17 +1698,21 @@ pub fn check_crate(tcx: ty::ctxt,
     for &(lint, level) in tcx.sess.opts.lint_opts.iter() {
         cx.set_level(lint, level, CommandLine);
     }
-    cx.with_lint_attrs(krate.attrs, |cx| {
+    cx.with_lint_attrs(krate.attrs.as_slice(), |cx| {
         cx.visit_id(ast::CRATE_NODE_ID);
         cx.visit_ids(|v| {
             v.visited_outermost = true;
             visit::walk_crate(v, krate, ());
         });
 
-        check_crate_attrs_usage(cx, krate.attrs);
+        check_crate_attrs_usage(cx, krate.attrs.as_slice());
         // since the root module isn't visited as an item (because it isn't an item), warn for it
         // here.
-        check_missing_doc_attrs(cx, None, krate.attrs, krate.span, "crate");
+        check_missing_doc_attrs(cx,
+                                None,
+                                krate.attrs.as_slice(),
+                                krate.span,
+                                "crate");
 
         visit::walk_crate(cx, krate, ());
     });
diff --git a/src/librustc/middle/liveness.rs b/src/librustc/middle/liveness.rs
index eb123a91119af..ab4de1ed71d79 100644
--- a/src/librustc/middle/liveness.rs
+++ b/src/librustc/middle/liveness.rs
@@ -1129,7 +1129,8 @@ impl Liveness {
                 let guard_succ =
                     self.propagate_through_opt_expr(arm.guard, body_succ);
                 let arm_succ =
-                    self.define_bindings_in_arm_pats(arm.pats, guard_succ);
+                    self.define_bindings_in_arm_pats(arm.pats.as_slice(),
+                                                     guard_succ);
                 self.merge_from_succ(ln, arm_succ, first_merge);
                 first_merge = false;
             };
@@ -1194,7 +1195,7 @@ impl Liveness {
           }
 
           ExprVec(ref exprs, _) => {
-            self.propagate_through_exprs(*exprs, succ)
+            self.propagate_through_exprs(exprs.as_slice(), succ)
           }
 
           ExprRepeat(element, count, _) => {
@@ -1215,7 +1216,7 @@ impl Liveness {
             let t_ret = ty::ty_fn_ret(ty::expr_ty(self.tcx, f));
             let succ = if ty::type_is_bot(t_ret) {self.s.exit_ln}
                        else {succ};
-            let succ = self.propagate_through_exprs(*args, succ);
+            let succ = self.propagate_through_exprs(args.as_slice(), succ);
             self.propagate_through_expr(f, succ)
           }
 
@@ -1225,11 +1226,11 @@ impl Liveness {
             let t_ret = ty::node_id_to_type(self.tcx, expr.id);
             let succ = if ty::type_is_bot(t_ret) {self.s.exit_ln}
                        else {succ};
-            self.propagate_through_exprs(*args, succ)
+            self.propagate_through_exprs(args.as_slice(), succ)
           }
 
           ExprTup(ref exprs) => {
-            self.propagate_through_exprs(*exprs, succ)
+            self.propagate_through_exprs(exprs.as_slice(), succ)
           }
 
           ExprBinary(op, l, r) if ast_util::lazy_binop(op) => {
@@ -1493,7 +1494,7 @@ fn check_local(this: &mut Liveness, local: &Local) {
 }
 
 fn check_arm(this: &mut Liveness, arm: &Arm) {
-    this.arm_pats_bindings(arm.pats, |ln, var, sp, id| {
+    this.arm_pats_bindings(arm.pats.as_slice(), |ln, var, sp, id| {
         this.warn_about_unused(sp, id, ln, var);
     });
     visit::walk_arm(this, arm, ());
diff --git a/src/librustc/middle/moves.rs b/src/librustc/middle/moves.rs
index 4864f72d8fcbd..b96a4e4c16064 100644
--- a/src/librustc/middle/moves.rs
+++ b/src/librustc/middle/moves.rs
@@ -409,11 +409,11 @@ impl VisitContext {
                     }
                 }
                 self.use_expr(callee, mode);
-                self.use_fn_args(*args);
+                self.use_fn_args(args.as_slice());
             }
 
             ExprMethodCall(_, _, ref args) => { // callee.m(args)
-                self.use_fn_args(*args);
+                self.use_fn_args(args.as_slice());
             }
 
             ExprStruct(_, ref fields, opt_with) => {
@@ -468,7 +468,7 @@ impl VisitContext {
             }
 
             ExprTup(ref exprs) => {
-                self.consume_exprs(*exprs);
+                self.consume_exprs(exprs.as_slice());
             }
 
             ExprIf(cond_expr, then_blk, opt_else_expr) => {
@@ -497,7 +497,7 @@ impl VisitContext {
             }
 
             ExprVec(ref exprs, _) => {
-                self.consume_exprs(*exprs);
+                self.consume_exprs(exprs.as_slice());
             }
 
             ExprAddrOf(_, base) => {   // &base
diff --git a/src/librustc/middle/privacy.rs b/src/librustc/middle/privacy.rs
index afe4d00103618..3d90566ee7931 100644
--- a/src/librustc/middle/privacy.rs
+++ b/src/librustc/middle/privacy.rs
@@ -759,7 +759,7 @@ impl<'a> Visitor<()> for PrivacyVisitor<'a> {
     fn visit_item(&mut self, item: &ast::Item, _: ()) {
         // Do not check privacy inside items with the resolve_unexported
         // attribute. This is used for the test runner.
-        if attr::contains_name(item.attrs, "!resolve_unexported") {
+        if attr::contains_name(item.attrs.as_slice(), "!resolve_unexported") {
             return;
         }
 
@@ -788,7 +788,8 @@ impl<'a> Visitor<()> for PrivacyVisitor<'a> {
             }
             ast::ExprMethodCall(ident, _, ref args) => {
                 // see above
-                let t = ty::type_autoderef(ty::expr_ty(self.tcx, args[0]));
+                let t = ty::type_autoderef(ty::expr_ty(self.tcx,
+                                                       *args.get(0)));
                 match ty::get(t).sty {
                     ty::ty_enum(_, _) | ty::ty_struct(_, _) => {
                         match self.method_map.borrow().get().find(&expr.id) {
@@ -857,7 +858,7 @@ impl<'a> Visitor<()> for PrivacyVisitor<'a> {
                                     lifetimes: opt_vec::Empty,
                                     types: opt_vec::Empty,
                                 };
-                                let segs = ~[seg];
+                                let segs = vec!(seg);
                                 let path = ast::Path {
                                     global: false,
                                     span: pid.span,
diff --git a/src/librustc/middle/reachable.rs b/src/librustc/middle/reachable.rs
index 4b2bc5c966f89..305c60d8215c9 100644
--- a/src/librustc/middle/reachable.rs
+++ b/src/librustc/middle/reachable.rs
@@ -44,7 +44,7 @@ fn generics_require_inlining(generics: &ast::Generics) -> bool {
 // monomorphized or it was marked with `#[inline]`. This will only return
 // true for functions.
 fn item_might_be_inlined(item: &ast::Item) -> bool {
-    if attributes_specify_inlining(item.attrs) {
+    if attributes_specify_inlining(item.attrs.as_slice()) {
         return true
     }
 
@@ -59,7 +59,7 @@ fn item_might_be_inlined(item: &ast::Item) -> bool {
 
 fn method_might_be_inlined(tcx: ty::ctxt, method: &ast::Method,
                            impl_src: ast::DefId) -> bool {
-    if attributes_specify_inlining(method.attrs) ||
+    if attributes_specify_inlining(method.attrs.as_slice()) ||
         generics_require_inlining(&method.generics) {
         return true
     }
@@ -217,7 +217,7 @@ impl ReachableContext {
             }
             Some(ast_map::NodeMethod(method)) => {
                 if generics_require_inlining(&method.generics) ||
-                        attributes_specify_inlining(method.attrs) {
+                        attributes_specify_inlining(method.attrs.as_slice()) {
                     true
                 } else {
                     let impl_did = tcx.map.get_parent_did(node_id);
@@ -324,7 +324,7 @@ impl ReachableContext {
                     // Statics with insignificant addresses are not reachable
                     // because they're inlined specially into all other crates.
                     ast::ItemStatic(..) => {
-                        if attr::contains_name(item.attrs,
+                        if attr::contains_name(item.attrs.as_slice(),
                                                "address_insignificant") {
                             let mut reachable_symbols =
                                 self.reachable_symbols.borrow_mut();
diff --git a/src/librustc/middle/resolve.rs b/src/librustc/middle/resolve.rs
index 8f0261dfb9170..58de36a796825 100644
--- a/src/librustc/middle/resolve.rs
+++ b/src/librustc/middle/resolve.rs
@@ -3690,7 +3690,7 @@ impl Resolver {
                                             generics,
                                             implemented_traits,
                                             self_type,
-                                            *methods);
+                                            methods.as_slice());
             }
 
             ItemTrait(ref generics, ref traits, ref methods) => {
@@ -3764,7 +3764,7 @@ impl Resolver {
             ItemStruct(ref struct_def, ref generics) => {
                 self.resolve_struct(item.id,
                                     generics,
-                                    struct_def.fields);
+                                    struct_def.fields.as_slice());
             }
 
             ItemMod(ref module_) => {
@@ -4187,8 +4187,10 @@ impl Resolver {
     // check that all of the arms in an or-pattern have exactly the
     // same set of bindings, with the same binding modes for each.
     fn check_consistent_bindings(&mut self, arm: &Arm) {
-        if arm.pats.len() == 0 { return; }
-        let map_0 = self.binding_mode_map(arm.pats[0]);
+        if arm.pats.len() == 0 {
+            return
+        }
+        let map_0 = self.binding_mode_map(*arm.pats.get(0));
         for (i, p) in arm.pats.iter().enumerate() {
             let map_i = self.binding_mode_map(*p);
 
@@ -4408,7 +4410,7 @@ impl Resolver {
                     // such a value is simply disallowed (since it's rarely
                     // what you want).
 
-                    let ident = path.segments[0].identifier;
+                    let ident = path.segments.get(0).identifier;
                     let renamed = mtwt_resolve(ident);
 
                     match self.resolve_bare_identifier_pattern(ident) {
diff --git a/src/librustc/middle/trans/_match.rs b/src/librustc/middle/trans/_match.rs
index 580a0fea90e43..d57557c5f1be3 100644
--- a/src/librustc/middle/trans/_match.rs
+++ b/src/librustc/middle/trans/_match.rs
@@ -652,7 +652,9 @@ fn enter_opt<'r,'b>(
                     // FIXME: Must we clone?
                     match *subpats {
                         None => Some(vec::from_elem(variant_size, dummy)),
-                        _ => (*subpats).clone(),
+                        Some(ref subpats) => {
+                            Some((*subpats).iter().map(|x| *x).collect())
+                        }
                     }
                 } else {
                     None
@@ -719,8 +721,15 @@ fn enter_opt<'r,'b>(
                         let this_opt = vec_len(n, vec_len_ge(before.len()),
                                                (lo, hi));
                         if opt_eq(tcx, &this_opt, opt) {
-                            Some(vec::append_one((*before).clone(), slice) +
-                                    *after)
+                            let mut new_before = ~[];
+                            for pat in before.iter() {
+                                new_before.push(*pat);
+                            }
+                            new_before.push(slice);
+                            for pat in after.iter() {
+                                new_before.push(*pat);
+                            }
+                            Some(new_before)
                         } else {
                             None
                         }
@@ -728,7 +737,11 @@ fn enter_opt<'r,'b>(
                     None if i >= lo && i <= hi => {
                         let n = before.len();
                         if opt_eq(tcx, &vec_len(n, vec_len_eq, (lo,hi)), opt) {
-                            Some((*before).clone())
+                            let mut new_before = ~[];
+                            for pat in before.iter() {
+                                new_before.push(*pat);
+                            }
+                            Some(new_before)
                         } else {
                             None
                         }
@@ -811,7 +824,13 @@ fn enter_tup<'r,'b>(
     let dummy = @ast::Pat {id: 0, node: ast::PatWild, span: DUMMY_SP};
     enter_match(bcx, dm, m, col, val, |p| {
         match p.node {
-            ast::PatTup(ref elts) => Some((*elts).clone()),
+            ast::PatTup(ref elts) => {
+                let mut new_elts = ~[];
+                for elt in elts.iter() {
+                    new_elts.push((*elt).clone())
+                }
+                Some(new_elts)
+            }
             _ => {
                 assert_is_binding_or_wild(bcx, p);
                 Some(vec::from_elem(n_elts, dummy))
@@ -838,7 +857,9 @@ fn enter_tuple_struct<'r,'b>(
     let dummy = @ast::Pat {id: 0, node: ast::PatWild, span: DUMMY_SP};
     enter_match(bcx, dm, m, col, val, |p| {
         match p.node {
-            ast::PatEnum(_, Some(ref elts)) => Some((*elts).clone()),
+            ast::PatEnum(_, Some(ref elts)) => {
+                Some(elts.iter().map(|x| (*x)).collect())
+            }
             _ => {
                 assert_is_binding_or_wild(bcx, p);
                 Some(vec::from_elem(n_elts, dummy))
@@ -1094,7 +1115,7 @@ fn collect_record_or_struct_fields<'a>(
           ast::PatStruct(_, ref fs, _) => {
             match ty::get(node_id_type(bcx, br.pats[col].id)).sty {
               ty::ty_struct(..) => {
-                   extend(&mut fields, *fs);
+                   extend(&mut fields, fs.as_slice());
                    found = true;
               }
               _ => ()
@@ -1866,7 +1887,7 @@ fn trans_match_inner<'a>(scope_cx: &'a Block<'a>,
     let mut matches = ~[];
     for arm in arms.iter() {
         let body = fcx.new_id_block("case_body", arm.body.id);
-        let bindings_map = create_bindings_map(bcx, arm.pats[0]);
+        let bindings_map = create_bindings_map(bcx, *arm.pats.get(0));
         let arm_data = ArmData {
             bodycx: body,
             arm: arm,
@@ -2172,7 +2193,7 @@ fn bind_irrefutable_pat<'a>(
                                                     val);
                     for sub_pat in sub_pats.iter() {
                         for (i, argval) in args.vals.iter().enumerate() {
-                            bcx = bind_irrefutable_pat(bcx, sub_pat[i],
+                            bcx = bind_irrefutable_pat(bcx, *sub_pat.get(i),
                                                        *argval, binding_mode,
                                                        cleanup_scope);
                         }
diff --git a/src/librustc/middle/trans/asm.rs b/src/librustc/middle/trans/asm.rs
index db99bd53704eb..130bcb4190224 100644
--- a/src/librustc/middle/trans/asm.rs
+++ b/src/librustc/middle/trans/asm.rs
@@ -100,13 +100,20 @@ pub fn trans_inline_asm<'a>(bcx: &'a Block<'a>, ia: &ast::InlineAsm)
 
     let r = ia.asm.get().with_c_str(|a| {
         constraints.with_c_str(|c| {
-            InlineAsmCall(bcx, a, c, inputs, output_type, ia.volatile, ia.alignstack, dialect)
+            InlineAsmCall(bcx,
+                          a,
+                          c,
+                          inputs.as_slice(),
+                          output_type,
+                          ia.volatile,
+                          ia.alignstack,
+                          dialect)
         })
     });
 
     // Again, based on how many outputs we have
     if numOutputs == 1 {
-        Store(bcx, r, outputs[0]);
+        Store(bcx, r, *outputs.get(0));
     } else {
         for (i, o) in outputs.iter().enumerate() {
             let v = ExtractValue(bcx, r, i);
diff --git a/src/librustc/middle/trans/base.rs b/src/librustc/middle/trans/base.rs
index 2bebba8c40463..b8301cbc33abf 100644
--- a/src/librustc/middle/trans/base.rs
+++ b/src/librustc/middle/trans/base.rs
@@ -1473,7 +1473,11 @@ pub fn trans_closure<'a>(ccx: @CrateContext,
     let arg_tys = ty::ty_fn_args(node_id_type(bcx, id));
     let arg_datums = create_datums_for_fn_args(&fcx, arg_tys);
 
-    bcx = copy_args_to_allocas(&fcx, arg_scope, bcx, decl.inputs, arg_datums);
+    bcx = copy_args_to_allocas(&fcx,
+                               arg_scope,
+                               bcx,
+                               decl.inputs.as_slice(),
+                               arg_datums);
 
     bcx = maybe_load_env(bcx);
 
@@ -1637,7 +1641,7 @@ pub fn trans_enum_def(ccx: @CrateContext, enum_definition: &ast::EnumDef,
         match variant.node.kind {
             ast::TupleVariantKind(ref args) if args.len() > 0 => {
                 let llfn = get_item_val(ccx, variant.node.id);
-                trans_enum_variant(ccx, id, variant, *args,
+                trans_enum_variant(ccx, id, variant, args.as_slice(),
                                    disr_val, None, llfn);
             }
             ast::TupleVariantKind(_) => {
@@ -1667,10 +1671,16 @@ pub fn trans_item(ccx: @CrateContext, item: &ast::Item) {
         if purity == ast::ExternFn  {
             let llfndecl = get_item_val(ccx, item.id);
             foreign::trans_rust_fn_with_foreign_abi(
-                ccx, decl, body, item.attrs, llfndecl, item.id);
+                ccx, decl, body, item.attrs.as_slice(), llfndecl, item.id);
         } else if !generics.is_type_parameterized() {
             let llfn = get_item_val(ccx, item.id);
-            trans_fn(ccx, decl, body, llfn, None, item.id, item.attrs);
+            trans_fn(ccx,
+                     decl,
+                     body,
+                     llfn,
+                     None,
+                     item.id,
+                     item.attrs.as_slice());
         } else {
             // Be sure to travel more than just one layer deep to catch nested
             // items in blocks and such.
@@ -1679,7 +1689,7 @@ pub fn trans_item(ccx: @CrateContext, item: &ast::Item) {
         }
       }
       ast::ItemImpl(ref generics, _, _, ref ms) => {
-        meth::trans_impl(ccx, item.ident, *ms, generics, item.id);
+        meth::trans_impl(ccx, item.ident, ms.as_slice(), generics, item.id);
       }
       ast::ItemMod(ref m) => {
         trans_mod(ccx, m);
@@ -1695,7 +1705,7 @@ pub fn trans_item(ccx: @CrateContext, item: &ast::Item) {
           consts::trans_const(ccx, m, item.id);
           // Do static_assert checking. It can't really be done much earlier
           // because we need to get the value of the bool out of LLVM
-          if attr::contains_name(item.attrs, "static_assert") {
+          if attr::contains_name(item.attrs.as_slice(), "static_assert") {
               if m == ast::MutMutable {
                   ccx.sess.span_fatal(expr.span,
                                       "cannot have static_assert on a mutable \
@@ -1738,7 +1748,7 @@ pub fn trans_struct_def(ccx: @CrateContext, struct_def: @ast::StructDef) {
         // otherwise this is a unit-like struct.
         Some(ctor_id) if struct_def.fields.len() > 0 => {
             let llfndecl = get_item_val(ccx, ctor_id);
-            trans_tuple_struct(ccx, struct_def.fields,
+            trans_tuple_struct(ccx, struct_def.fields.as_slice(),
                                ctor_id, None, llfndecl);
         }
         Some(_) | None => {}
@@ -1925,7 +1935,7 @@ pub fn get_item_val(ccx: @CrateContext, id: ast::NodeId) -> ValueRef {
             let val = match item {
                 ast_map::NodeItem(i) => {
                     let ty = ty::node_id_to_type(ccx.tcx, i.id);
-                    let sym = exported_name(ccx, id, ty, i.attrs);
+                    let sym = exported_name(ccx, id, ty, i.attrs.as_slice());
 
                     let v = match i.node {
                         ast::ItemStatic(_, _, expr) => {
@@ -1974,7 +1984,7 @@ pub fn get_item_val(ccx: @CrateContext, id: ast::NodeId) -> ValueRef {
 
                                 // Apply the `unnamed_addr` attribute if
                                 // requested
-                                if attr::contains_name(i.attrs,
+                                if attr::contains_name(i.attrs.as_slice(),
                                                        "address_insignificant"){
                                     {
                                         let reachable =
@@ -2006,7 +2016,8 @@ pub fn get_item_val(ccx: @CrateContext, id: ast::NodeId) -> ValueRef {
                                     inlineable = true;
                                 }
 
-                                if attr::contains_name(i.attrs, "thread_local") {
+                                if attr::contains_name(i.attrs.as_slice(),
+                                                       "thread_local") {
                                     lib::llvm::set_thread_local(g, true);
                                 }
 
@@ -2034,14 +2045,16 @@ pub fn get_item_val(ccx: @CrateContext, id: ast::NodeId) -> ValueRef {
                                                                            sym,
                                                                            i.id)
                             };
-                            set_llvm_fn_attrs(i.attrs, llfn);
+                            set_llvm_fn_attrs(i.attrs.as_slice(), llfn);
                             llfn
                         }
 
                         _ => fail!("get_item_val: weird result in table")
                     };
 
-                    match attr::first_attr_value_str_by_name(i.attrs, "link_section") {
+                    match attr::first_attr_value_str_by_name(i.attrs
+                                                              .as_slice(),
+                                                             "link_section") {
                         Some(sect) => unsafe {
                             sect.get().with_c_str(|buf| {
                                 llvm::LLVMSetSection(v, buf);
@@ -2087,7 +2100,8 @@ pub fn get_item_val(ccx: @CrateContext, id: ast::NodeId) -> ValueRef {
                             // with weak linkage, but if we're building a
                             // library then we've already declared the crate map
                             // so use that instead.
-                            if attr::contains_name(ni.attrs, "crate_map") {
+                            if attr::contains_name(ni.attrs.as_slice(),
+                                                   "crate_map") {
                                 if ccx.sess.building_library.get() {
                                     let s = "_rust_crate_map_toplevel";
                                     let g = unsafe {
@@ -2126,7 +2140,10 @@ pub fn get_item_val(ccx: @CrateContext, id: ast::NodeId) -> ValueRef {
                             let ty = ty::node_id_to_type(ccx.tcx, id);
                             let parent = ccx.tcx.map.get_parent(id);
                             let enm = ccx.tcx.map.expect_item(parent);
-                            let sym = exported_name(ccx, id, ty, enm.attrs);
+                            let sym = exported_name(ccx,
+                                                    id,
+                                                    ty,
+                                                    enm.attrs.as_slice());
 
                             llfn = match enm.node {
                                 ast::ItemEnum(_, _) => {
@@ -2154,7 +2171,11 @@ pub fn get_item_val(ccx: @CrateContext, id: ast::NodeId) -> ValueRef {
                             let parent = ccx.tcx.map.get_parent(id);
                             let struct_item = ccx.tcx.map.expect_item(parent);
                             let ty = ty::node_id_to_type(ccx.tcx, ctor_id);
-                            let sym = exported_name(ccx, id, ty, struct_item.attrs);
+                            let sym = exported_name(ccx,
+                                                    id,
+                                                    ty,
+                                                    struct_item.attrs
+                                                               .as_slice());
                             let llfn = register_fn(ccx, struct_item.span,
                                                    sym, ctor_id, ty);
                             set_inline_hint(llfn);
@@ -2190,10 +2211,10 @@ fn register_method(ccx: @CrateContext, id: ast::NodeId,
                    m: &ast::Method) -> ValueRef {
     let mty = ty::node_id_to_type(ccx.tcx, id);
 
-    let sym = exported_name(ccx, id, mty, m.attrs);
+    let sym = exported_name(ccx, id, mty, m.attrs.as_slice());
 
     let llfn = register_fn(ccx, m.span, sym, id, mty);
-    set_llvm_fn_attrs(m.attrs, llfn);
+    set_llvm_fn_attrs(m.attrs.as_slice(), llfn);
     llfn
 }
 
diff --git a/src/librustc/middle/trans/consts.rs b/src/librustc/middle/trans/consts.rs
index b3c3b22c1f5ba..793c70770a932 100644
--- a/src/librustc/middle/trans/consts.rs
+++ b/src/librustc/middle/trans/consts.rs
@@ -75,7 +75,9 @@ pub fn const_lit(cx: &CrateContext, e: &ast::Expr, lit: ast::Lit)
         ast::LitBool(b) => C_bool(b),
         ast::LitNil => C_nil(),
         ast::LitStr(ref s, _) => C_str_slice(cx, (*s).clone()),
-        ast::LitBinary(ref data) => C_binary_slice(cx, *data.borrow()),
+        ast::LitBinary(ref data) => {
+            C_binary_slice(cx, data.borrow().as_slice())
+        }
     }
 }
 
@@ -529,7 +531,7 @@ fn const_expr_unadjusted(cx: @CrateContext, e: &ast::Expr,
           ast::ExprTup(ref es) => {
               let ety = ty::expr_ty(cx.tcx, e);
               let repr = adt::represent_type(cx, ety);
-              let (vals, inlineable) = map_list(*es);
+              let (vals, inlineable) = map_list(es.as_slice());
               (adt::trans_const(cx, repr, 0, vals), inlineable)
           }
           ast::ExprStruct(_, ref fs, ref base_opt) => {
@@ -564,7 +566,10 @@ fn const_expr_unadjusted(cx: @CrateContext, e: &ast::Expr,
               })
           }
           ast::ExprVec(ref es, ast::MutImmutable) => {
-            let (v, _, inlineable) = const_vec(cx, e, *es, is_local);
+            let (v, _, inlineable) = const_vec(cx,
+                                               e,
+                                               es.as_slice(),
+                                               is_local);
             (v, inlineable)
           }
           ast::ExprVstore(sub, ast::ExprVstoreSlice) => {
@@ -576,7 +581,10 @@ fn const_expr_unadjusted(cx: @CrateContext, e: &ast::Expr,
                 }
               }
               ast::ExprVec(ref es, ast::MutImmutable) => {
-                let (cv, llunitty, _) = const_vec(cx, e, *es, is_local);
+                let (cv, llunitty, _) = const_vec(cx,
+                                                  e,
+                                                  es.as_slice(),
+                                                  is_local);
                 let llty = val_ty(cv);
                 let gv = "const".with_c_str(|name| {
                     llvm::LLVMAddGlobal(cx.llmod, llty.to_ref(), name)
@@ -657,7 +665,7 @@ fn const_expr_unadjusted(cx: @CrateContext, e: &ast::Expr,
                   Some(ast::DefStruct(_)) => {
                       let ety = ty::expr_ty(cx.tcx, e);
                       let repr = adt::represent_type(cx, ety);
-                      let (arg_vals, inlineable) = map_list(*args);
+                      let (arg_vals, inlineable) = map_list(args.as_slice());
                       (adt::trans_const(cx, repr, 0, arg_vals), inlineable)
                   }
                   Some(ast::DefVariant(enum_did, variant_did, _)) => {
@@ -666,7 +674,7 @@ fn const_expr_unadjusted(cx: @CrateContext, e: &ast::Expr,
                       let vinfo = ty::enum_variant_with_id(cx.tcx,
                                                            enum_did,
                                                            variant_did);
-                      let (arg_vals, inlineable) = map_list(*args);
+                      let (arg_vals, inlineable) = map_list(args.as_slice());
                       (adt::trans_const(cx, repr, vinfo.disr_val, arg_vals),
                        inlineable)
                   }
diff --git a/src/librustc/middle/trans/debuginfo.rs b/src/librustc/middle/trans/debuginfo.rs
index 9dc119b024f54..44e6bbf91cf7c 100644
--- a/src/librustc/middle/trans/debuginfo.rs
+++ b/src/librustc/middle/trans/debuginfo.rs
@@ -690,7 +690,7 @@ pub fn create_function_debug_context(cx: &CrateContext,
     {
         let mut scope_map = fn_debug_context.scope_map.borrow_mut();
         populate_scope_map(cx,
-                           arg_pats,
+                           arg_pats.as_slice(),
                            top_level_block,
                            fn_metadata,
                            scope_map.get());
@@ -2650,7 +2650,7 @@ fn populate_scope_map(cx: &CrateContext,
                 // they all must contain the same binding names
 
                 for arm_ref in arms.iter() {
-                    let arm_span = arm_ref.pats[0].span;
+                    let arm_span = arm_ref.pats.get(0).span;
 
                     with_new_scope(cx,
                                    arm_span,
diff --git a/src/librustc/middle/trans/expr.rs b/src/librustc/middle/trans/expr.rs
index 987d60957d175..b033086125dec 100644
--- a/src/librustc/middle/trans/expr.rs
+++ b/src/librustc/middle/trans/expr.rs
@@ -731,13 +731,18 @@ fn trans_rvalue_dps_unadjusted<'a>(bcx: &'a Block<'a>,
             controlflow::trans_if(bcx, expr.id, cond, thn, els, dest)
         }
         ast::ExprMatch(discr, ref arms) => {
-            _match::trans_match(bcx, expr, discr, *arms, dest)
+            _match::trans_match(bcx, expr, discr, arms.as_slice(), dest)
         }
         ast::ExprBlock(blk) => {
             controlflow::trans_block(bcx, blk, dest)
         }
         ast::ExprStruct(_, ref fields, base) => {
-            trans_rec_or_struct(bcx, (*fields), base, expr.span, expr.id, dest)
+            trans_rec_or_struct(bcx,
+                                fields.as_slice(),
+                                base,
+                                expr.span,
+                                expr.id,
+                                dest)
         }
         ast::ExprTup(ref args) => {
             let repr = adt::represent_type(bcx.ccx(), expr_ty(bcx, expr));
@@ -777,10 +782,19 @@ fn trans_rvalue_dps_unadjusted<'a>(bcx: &'a Block<'a>,
             closure::trans_expr_fn(bcx, sigil, decl, body, expr.id, dest)
         }
         ast::ExprCall(f, ref args) => {
-            callee::trans_call(bcx, expr, f, callee::ArgExprs(*args), expr.id, dest)
+            callee::trans_call(bcx,
+                               expr,
+                               f,
+                               callee::ArgExprs(args.as_slice()),
+                               expr.id,
+                               dest)
         }
         ast::ExprMethodCall(_, _, ref args) => {
-            callee::trans_method_call(bcx, expr, args[0], callee::ArgExprs(*args), dest)
+            callee::trans_method_call(bcx,
+                                      expr,
+                                      *args.get(0),
+                                      callee::ArgExprs(args.as_slice()),
+                                      dest)
         }
         ast::ExprBinary(_, lhs, rhs) => {
             // if not overloaded, would be RvalueDatumExpr
diff --git a/src/librustc/middle/trans/foreign.rs b/src/librustc/middle/trans/foreign.rs
index d0eef924356ab..7f90810bae48e 100644
--- a/src/librustc/middle/trans/foreign.rs
+++ b/src/librustc/middle/trans/foreign.rs
@@ -713,7 +713,8 @@ pub fn trans_rust_fn_with_foreign_abi(ccx: @CrateContext,
 // the massive simplifications that have occurred.
 
 pub fn link_name(i: @ast::ForeignItem) -> InternedString {
-     match attr::first_attr_value_str_by_name(i.attrs, "link_name") {
+     match attr::first_attr_value_str_by_name(i.attrs.as_slice(),
+                                              "link_name") {
         None => token::get_ident(i.ident),
         Some(ln) => ln.clone(),
     }
diff --git a/src/librustc/middle/trans/inline.rs b/src/librustc/middle/trans/inline.rs
index 878d7d9f39cad..896d97f037405 100644
--- a/src/librustc/middle/trans/inline.rs
+++ b/src/librustc/middle/trans/inline.rs
@@ -74,7 +74,7 @@ pub fn maybe_instantiate_inline(ccx: @CrateContext, fn_id: ast::DefId)
                     let g = get_item_val(ccx, item.id);
                     // see the comment in get_item_val() as to why this check is
                     // performed here.
-                    if !attr::contains_name(item.attrs,
+                    if !attr::contains_name(item.attrs.as_slice(),
                                             "address_insignificant") {
                         SetLinkage(g, AvailableExternallyLinkage);
                     }
diff --git a/src/librustc/middle/trans/monomorphize.rs b/src/librustc/middle/trans/monomorphize.rs
index 7e047ae8c105d..c76d1cbcd20a4 100644
--- a/src/librustc/middle/trans/monomorphize.rs
+++ b/src/librustc/middle/trans/monomorphize.rs
@@ -201,7 +201,7 @@ pub fn monomorphic_fn(ccx: @CrateContext,
                   ..
               } => {
                   let d = mk_lldecl();
-                  set_llvm_fn_attrs(i.attrs, d);
+                  set_llvm_fn_attrs(i.attrs.as_slice(), d);
                   trans_fn(ccx, decl, body, d, Some(psubsts), fn_id.node, []);
                   d
               }
@@ -232,7 +232,7 @@ pub fn monomorphic_fn(ccx: @CrateContext,
                     trans_enum_variant(ccx,
                                        parent,
                                        v,
-                                       (*args).clone(),
+                                       args.as_slice(),
                                        this_tv.disr_val,
                                        Some(psubsts),
                                        d);
@@ -244,7 +244,7 @@ pub fn monomorphic_fn(ccx: @CrateContext,
         }
         ast_map::NodeMethod(mth) => {
             let d = mk_lldecl();
-            set_llvm_fn_attrs(mth.attrs, d);
+            set_llvm_fn_attrs(mth.attrs.as_slice(), d);
             trans_fn(ccx, mth.decl, mth.body, d, Some(psubsts), mth.id, []);
             d
         }
@@ -252,7 +252,7 @@ pub fn monomorphic_fn(ccx: @CrateContext,
             match *method {
                 ast::Provided(mth) => {
                     let d = mk_lldecl();
-                    set_llvm_fn_attrs(mth.attrs, d);
+                    set_llvm_fn_attrs(mth.attrs.as_slice(), d);
                     trans_fn(ccx, mth.decl, mth.body, d, Some(psubsts), mth.id, []);
                     d
                 }
@@ -266,7 +266,7 @@ pub fn monomorphic_fn(ccx: @CrateContext,
             let d = mk_lldecl();
             set_inline_hint(d);
             base::trans_tuple_struct(ccx,
-                                     struct_def.fields,
+                                     struct_def.fields.as_slice(),
                                      struct_def.ctor_id.expect("ast-mapped tuple struct \
                                                                 didn't have a ctor id"),
                                      Some(psubsts),
diff --git a/src/librustc/middle/ty.rs b/src/librustc/middle/ty.rs
index 2ca19f0b61d82..210adc1d0a5ec 100644
--- a/src/librustc/middle/ty.rs
+++ b/src/librustc/middle/ty.rs
@@ -3730,8 +3730,11 @@ pub fn provided_trait_methods(cx: ctxt, id: ast::DefId) -> ~[@Method] {
                 Some(ast_map::NodeItem(item)) => {
                     match item.node {
                         ItemTrait(_, _, ref ms) => {
-                            let (_, p) = ast_util::split_trait_methods(*ms);
-                            p.map(|m| method(cx, ast_util::local_def(m.id)))
+                            let (_, p) =
+                                ast_util::split_trait_methods(ms.as_slice());
+                            p.iter()
+                             .map(|m| method(cx, ast_util::local_def(m.id)))
+                             .collect()
                         }
                         _ => {
                             cx.sess.bug(format!("provided_trait_methods: \
@@ -3947,7 +3950,7 @@ impl VariantInfo {
             },
             ast::StructVariantKind(ref struct_def) => {
 
-                let fields: &[StructField] = struct_def.fields;
+                let fields: &[StructField] = struct_def.fields.as_slice();
 
                 assert!(fields.len() > 0);
 
@@ -4280,7 +4283,7 @@ pub fn lookup_struct_fields(cx: ctxt, did: ast::DefId) -> ~[field_ty] {
            Some(ast_map::NodeItem(i)) => {
              match i.node {
                 ast::ItemStruct(struct_def, _) => {
-                   struct_field_tys(struct_def.fields)
+                   struct_field_tys(struct_def.fields.as_slice())
                 }
                 _ => cx.sess.bug("struct ID bound to non-struct")
              }
@@ -4288,7 +4291,7 @@ pub fn lookup_struct_fields(cx: ctxt, did: ast::DefId) -> ~[field_ty] {
            Some(ast_map::NodeVariant(ref variant)) => {
               match (*variant).node.kind {
                 ast::StructVariantKind(struct_def) => {
-                  struct_field_tys(struct_def.fields)
+                  struct_field_tys(struct_def.fields.as_slice())
                 }
                 _ => {
                   cx.sess.bug("struct ID bound to enum variant that isn't \
diff --git a/src/librustc/middle/typeck/astconv.rs b/src/librustc/middle/typeck/astconv.rs
index e569f0756e682..e1157d29d9d82 100644
--- a/src/librustc/middle/typeck/astconv.rs
+++ b/src/librustc/middle/typeck/astconv.rs
@@ -60,7 +60,7 @@ use middle::typeck::rscope::{RegionScope};
 use middle::typeck::lookup_def_tcx;
 use util::ppaux::Repr;
 
-use std::vec;
+use std::vec_ng::Vec;
 use syntax::abi::AbiSet;
 use syntax::{ast, ast_util};
 use syntax::codemap::Span;
@@ -186,8 +186,8 @@ fn ast_path_substs<AC:AstConv,RS:RegionScope>(
         }
 
         match anon_regions {
-            Ok(v) => opt_vec::from(v),
-            Err(()) => opt_vec::from(vec::from_fn(expected_num_region_params,
+            Ok(v) => opt_vec::from(v.move_iter().collect()),
+            Err(()) => opt_vec::from(Vec::from_fn(expected_num_region_params,
                                                   |_| ty::ReStatic)) // hokey
         }
     };
@@ -519,7 +519,9 @@ pub fn ast_ty_to_ty<AC:AstConv, RS:RegionScope>(
                            |tmt| ty::mk_rptr(tcx, r, tmt))
             }
             ast::TyTup(ref fields) => {
-                let flds = fields.map(|&t| ast_ty_to_ty(this, rscope, t));
+                let flds = fields.iter()
+                                 .map(|&t| ast_ty_to_ty(this, rscope, t))
+                                 .collect();
                 ty::mk_tup(tcx, flds)
             }
             ast::TyBareFn(ref bf) => {
diff --git a/src/librustc/middle/typeck/check/_match.rs b/src/librustc/middle/typeck/check/_match.rs
index 6620f8502edf3..def80e39821ee 100644
--- a/src/librustc/middle/typeck/check/_match.rs
+++ b/src/librustc/middle/typeck/check/_match.rs
@@ -20,6 +20,7 @@ use middle::typeck::infer;
 use middle::typeck::require_same_types;
 
 use collections::{HashMap, HashSet};
+use std::vec_ng::Vec;
 use syntax::ast;
 use syntax::ast_util;
 use syntax::parse::token;
@@ -40,7 +41,7 @@ pub fn check_match(fcx: @FnCtxt,
     for arm in arms.iter() {
         let mut pcx = pat_ctxt {
             fcx: fcx,
-            map: pat_id_map(tcx.def_map, arm.pats[0]),
+            map: pat_id_map(tcx.def_map, *arm.pats.get(0)),
         };
 
         for p in arm.pats.iter() { check_pat(&mut pcx, *p, discrim_ty);}
@@ -108,13 +109,13 @@ pub struct pat_ctxt {
 }
 
 pub fn check_pat_variant(pcx: &pat_ctxt, pat: &ast::Pat, path: &ast::Path,
-                         subpats: &Option<~[@ast::Pat]>, expected: ty::t) {
+                         subpats: &Option<Vec<@ast::Pat>>, expected: ty::t) {
 
     // Typecheck the path.
     let fcx = pcx.fcx;
     let tcx = pcx.fcx.ccx.tcx;
 
-    let arg_types;
+    let arg_types: ~[ty::t];
     let kind_name;
 
     // structure_of requires type variables to be resolved.
@@ -174,8 +175,10 @@ pub fn check_pat_variant(pcx: &pat_ctxt, pat: &ast::Pat, path: &ast::Path,
                     fcx.write_error(pat.id);
                     kind_name = "[error]";
                     arg_types = subpats.clone()
-                                          .unwrap_or_default()
-                                          .map(|_| ty::mk_err());
+                                       .unwrap_or_default()
+                                       .move_iter()
+                                       .map(|_| ty::mk_err())
+                                       .collect();
                 }
             }
         }
@@ -223,8 +226,10 @@ pub fn check_pat_variant(pcx: &pat_ctxt, pat: &ast::Pat, path: &ast::Path,
             fcx.write_error(pat.id);
             kind_name = "[error]";
             arg_types = subpats.clone()
-                                  .unwrap_or_default()
-                                  .map(|_| ty::mk_err());
+                               .unwrap_or_default()
+                               .iter()
+                               .map(|_| ty::mk_err())
+                               .collect();
         }
     }
 
@@ -509,7 +514,7 @@ pub fn check_pat(pcx: &pat_ctxt, pat: &ast::Pat, expected: ty::t) {
         }
       }
       ast::PatIdent(_, ref path, _) => {
-        check_pat_variant(pcx, pat, path, &Some(~[]), expected);
+        check_pat_variant(pcx, pat, path, &Some(Vec::new()), expected);
       }
       ast::PatEnum(ref path, ref subpats) => {
         check_pat_variant(pcx, pat, path, subpats, expected);
@@ -521,12 +526,18 @@ pub fn check_pat(pcx: &pat_ctxt, pat: &ast::Pat, expected: ty::t) {
         match *structure {
             ty::ty_struct(cid, ref substs) => {
                 check_struct_pat(pcx, pat.id, pat.span, expected, path,
-                                 *fields, etc, cid, substs);
+                                 fields.as_slice(), etc, cid, substs);
             }
             ty::ty_enum(eid, ref substs) => {
-                check_struct_like_enum_variant_pat(
-                    pcx, pat.id, pat.span, expected, path, *fields, etc, eid,
-                    substs);
+                check_struct_like_enum_variant_pat(pcx,
+                                                   pat.id,
+                                                   pat.span,
+                                                   expected,
+                                                   path,
+                                                   fields.as_slice(),
+                                                   etc,
+                                                   eid,
+                                                   substs);
             }
             _ => {
                // See [Note-Type-error-reporting] in middle/typeck/infer/mod.rs
@@ -540,9 +551,19 @@ pub fn check_pat(pcx: &pat_ctxt, pat: &ast::Pat, expected: ty::t) {
                 let def_map = tcx.def_map.borrow();
                 match def_map.get().find(&pat.id) {
                     Some(&ast::DefStruct(supplied_def_id)) => {
-                         check_struct_pat(pcx, pat.id, pat.span, ty::mk_err(), path, *fields, etc,
-                         supplied_def_id,
-                         &ty::substs { self_ty: None, tps: ~[], regions: ty::ErasedRegions} );
+                         check_struct_pat(pcx,
+                                          pat.id,
+                                          pat.span,
+                                          ty::mk_err(),
+                                          path,
+                                          fields.as_slice(),
+                                          etc,
+                                          supplied_def_id,
+                                          &ty::substs {
+                                              self_ty: None,
+                                              tps: ~[],
+                                              regions: ty::ErasedRegions,
+                                          });
                     }
                     _ => () // Error, but we're already in an error case
                 }
diff --git a/src/librustc/middle/typeck/check/mod.rs b/src/librustc/middle/typeck/check/mod.rs
index 4339d2c62be9f..6e9cfc9d0d2b0 100644
--- a/src/librustc/middle/typeck/check/mod.rs
+++ b/src/librustc/middle/typeck/check/mod.rs
@@ -387,7 +387,7 @@ impl Visitor<()> for GatherLocalsVisitor {
                 {
                     let locals = self.fcx.inh.locals.borrow();
                     debug!("Pattern binding {} is assigned to {}",
-                           token::get_ident(path.segments[0].identifier),
+                           token::get_ident(path.segments.get(0).identifier),
                            self.fcx.infcx().ty_to_str(
                                locals.get().get_copy(&p.id)));
                 }
@@ -554,7 +554,7 @@ pub fn check_item(ccx: @CrateCtxt, it: &ast::Item) {
       ast::ItemEnum(ref enum_definition, _) => {
         check_enum_variants(ccx,
                             it.span,
-                            enum_definition.variants,
+                            enum_definition.variants.as_slice(),
                             it.id);
       }
       ast::ItemFn(decl, _, _, _, body) => {
@@ -588,7 +588,7 @@ pub fn check_item(ccx: @CrateCtxt, it: &ast::Item) {
                                              &impl_tpt.generics,
                                              ast_trait_ref,
                                              impl_trait_ref,
-                                             *ms);
+                                             ms.as_slice());
                 vtable::resolve_impl(ccx.tcx, it, &impl_tpt.generics, impl_trait_ref);
             }
             None => { }
@@ -1397,9 +1397,12 @@ pub fn impl_self_ty(vcx: &VtableContext,
             n_rps);
     let tps = vcx.infcx.next_ty_vars(n_tps);
 
-    let substs = substs {regions: ty::NonerasedRegions(opt_vec::from(rps)),
-                         self_ty: None,
-                         tps: tps};
+    let substs = substs {
+        regions: ty::NonerasedRegions(opt_vec::from(rps.move_iter()
+                                                       .collect())),
+        self_ty: None,
+        tps: tps,
+    };
     let substd_ty = ty::subst(tcx, &substs, raw_ty);
 
     ty_param_substs_and_ty { substs: substs, ty: substd_ty }
@@ -1453,7 +1456,7 @@ fn check_type_parameter_positions_in_path(function_context: @FnCtxt,
     // Verify that no lifetimes or type parameters are present anywhere
     // except the final two elements of the path.
     for i in range(0, path.segments.len() - 2) {
-        for lifetime in path.segments[i].lifetimes.iter() {
+        for lifetime in path.segments.get(i).lifetimes.iter() {
             function_context.tcx()
                 .sess
                 .span_err(lifetime.span,
@@ -1462,7 +1465,7 @@ fn check_type_parameter_positions_in_path(function_context: @FnCtxt,
             break;
         }
 
-        for typ in path.segments[i].types.iter() {
+        for typ in path.segments.get(i).types.iter() {
             function_context.tcx()
                             .sess
                             .span_err(typ.span,
@@ -1493,7 +1496,7 @@ fn check_type_parameter_positions_in_path(function_context: @FnCtxt,
                 ast::FromImpl(_) => "impl",
             };
 
-            let trait_segment = &path.segments[path.segments.len() - 2];
+            let trait_segment = &path.segments.get(path.segments.len() - 2);
 
             // Make sure lifetime parameterization agrees with the trait or
             // implementation type.
@@ -1567,7 +1570,7 @@ fn check_type_parameter_positions_in_path(function_context: @FnCtxt,
         _ => {
             // Verify that no lifetimes or type parameters are present on
             // the penultimate segment of the path.
-            let segment = &path.segments[path.segments.len() - 2];
+            let segment = &path.segments.get(path.segments.len() - 2);
             for lifetime in segment.lifetimes.iter() {
                 function_context.tcx()
                     .sess
@@ -2415,7 +2418,7 @@ pub fn check_expr_with_unifier(fcx: @FnCtxt,
         // Generate the struct type.
         let regions = fcx.infcx().next_region_vars(
             infer::BoundRegionInTypeOrImpl(span),
-            region_parameter_count);
+            region_parameter_count).move_iter().collect();
         let type_parameters = fcx.infcx().next_ty_vars(type_parameter_count);
         let substitutions = substs {
             regions: ty::NonerasedRegions(opt_vec::from(regions)),
@@ -2473,7 +2476,7 @@ pub fn check_expr_with_unifier(fcx: @FnCtxt,
         // Generate the enum type.
         let regions = fcx.infcx().next_region_vars(
             infer::BoundRegionInTypeOrImpl(span),
-            region_parameter_count);
+            region_parameter_count).move_iter().collect();
         let type_parameters = fcx.infcx().next_ty_vars(type_parameter_count);
         let substitutions = substs {
             regions: ty::NonerasedRegions(opt_vec::from(regions)),
@@ -2866,7 +2869,7 @@ pub fn check_expr_with_unifier(fcx: @FnCtxt,
         }
       }
       ast::ExprMatch(discrim, ref arms) => {
-        _match::check_match(fcx, expr, discrim, *arms);
+        _match::check_match(fcx, expr, discrim, arms.as_slice());
       }
       ast::ExprFnBlock(decl, body) => {
         check_expr_fn(fcx,
@@ -2891,7 +2894,7 @@ pub fn check_expr_with_unifier(fcx: @FnCtxt,
         fcx.write_ty(id, fcx.node_ty(b.id));
       }
       ast::ExprCall(f, ref args) => {
-          check_call(fcx, expr, f, *args);
+          check_call(fcx, expr, f, args.as_slice());
           let f_ty = fcx.expr_ty(f);
           let (args_bot, args_err) = args.iter().fold((false, false),
              |(rest_bot, rest_err), a| {
@@ -2907,7 +2910,7 @@ pub fn check_expr_with_unifier(fcx: @FnCtxt,
           }
       }
       ast::ExprMethodCall(ident, ref tps, ref args) => {
-        check_method_call(fcx, expr, ident, *args, *tps);
+        check_method_call(fcx, expr, ident, args.as_slice(), tps.as_slice());
         let arg_tys = args.map(|a| fcx.expr_ty(*a));
         let (args_bot, args_err) = arg_tys.iter().fold((false, false),
              |(rest_bot, rest_err), a| {
@@ -3093,11 +3096,11 @@ pub fn check_expr_with_unifier(fcx: @FnCtxt,
         match def_map.get().find(&id) {
             Some(&ast::DefStruct(type_def_id)) => {
                 check_struct_constructor(fcx, id, expr.span, type_def_id,
-                                         *fields, base_expr);
+                                         fields.as_slice(), base_expr);
             }
             Some(&ast::DefVariant(enum_id, variant_id, _)) => {
                 check_struct_enum_variant(fcx, id, expr.span, enum_id,
-                                          variant_id, *fields);
+                                          variant_id, fields.as_slice());
             }
             _ => {
                 tcx.sess.span_bug(path.span,
@@ -3106,7 +3109,7 @@ pub fn check_expr_with_unifier(fcx: @FnCtxt,
         }
       }
       ast::ExprField(base, field, ref tys) => {
-        check_field(fcx, expr, base, field.name, *tys);
+        check_field(fcx, expr, base, field.name, tys.as_slice());
       }
       ast::ExprIndex(base, idx) => {
           check_expr(fcx, base);
@@ -3670,7 +3673,7 @@ pub fn instantiate_path(fcx: @FnCtxt,
 
         opt_vec::from(fcx.infcx().next_region_vars(
                 infer::BoundRegionInTypeOrImpl(span),
-                num_expected_regions))
+                num_expected_regions).move_iter().collect())
     };
     let regions = ty::NonerasedRegions(regions);
 
diff --git a/src/librustc/middle/typeck/check/regionck.rs b/src/librustc/middle/typeck/check/regionck.rs
index 5e2ad9fc35bd0..ed03ced5ca066 100644
--- a/src/librustc/middle/typeck/check/regionck.rs
+++ b/src/librustc/middle/typeck/check/regionck.rs
@@ -437,13 +437,18 @@ fn visit_expr(rcx: &mut Rcx, expr: &ast::Expr) {
     match expr.node {
         ast::ExprCall(callee, ref args) => {
             constrain_callee(rcx, callee.id, expr, callee);
-            constrain_call(rcx, Some(callee.id), expr, None, *args, false);
+            constrain_call(rcx,
+                           Some(callee.id),
+                           expr,
+                           None,
+                           args.as_slice(),
+                           false);
 
             visit::walk_expr(rcx, expr, ());
         }
 
         ast::ExprMethodCall(_, _, ref args) => {
-            constrain_call(rcx, None, expr, Some(args[0]),
+            constrain_call(rcx, None, expr, Some(*args.get(0)),
                            args.slice_from(1), false);
 
             visit::walk_expr(rcx, expr, ());
@@ -545,7 +550,7 @@ fn visit_expr(rcx: &mut Rcx, expr: &ast::Expr) {
         }
 
         ast::ExprMatch(discr, ref arms) => {
-            link_match(rcx, discr, *arms);
+            link_match(rcx, discr, arms.as_slice());
 
             visit::walk_expr(rcx, expr, ());
         }
diff --git a/src/librustc/middle/typeck/coherence.rs b/src/librustc/middle/typeck/coherence.rs
index 37929957ae6ba..e47b6e722f386 100644
--- a/src/librustc/middle/typeck/coherence.rs
+++ b/src/librustc/middle/typeck/coherence.rs
@@ -524,7 +524,8 @@ impl CoherenceChecker {
         let type_parameters = self.inference_context.next_ty_vars(bounds_count);
 
         let substitutions = substs {
-            regions: ty::NonerasedRegions(opt_vec::from(region_parameters)),
+            regions: ty::NonerasedRegions(opt_vec::from(
+                             region_parameters.move_iter().collect())),
             self_ty: None,
             tps: type_parameters
         };
diff --git a/src/librustc/middle/typeck/collect.rs b/src/librustc/middle/typeck/collect.rs
index f048637d68fb0..f7733335c9177 100644
--- a/src/librustc/middle/typeck/collect.rs
+++ b/src/librustc/middle/typeck/collect.rs
@@ -149,7 +149,7 @@ pub fn get_enum_variant_types(ccx: &CrateCtxt,
             ast::TupleVariantKind(ref args) if args.len() > 0 => {
                 let rs = ExplicitRscope;
                 let input_tys = args.map(|va| ccx.to_ty(&rs, va.ty));
-                ty::mk_ctor_fn(tcx, scope, input_tys, enum_ty)
+                ty::mk_ctor_fn(tcx, scope, input_tys.as_slice(), enum_ty)
             }
 
             ast::TupleVariantKind(_) => {
@@ -166,7 +166,7 @@ pub fn get_enum_variant_types(ccx: &CrateCtxt,
 
                 let input_tys = struct_def.fields.map(
                     |f| ty::node_id_to_type(ccx.tcx, f.node.id));
-                ty::mk_ctor_fn(tcx, scope, input_tys, enum_ty)
+                ty::mk_ctor_fn(tcx, scope, input_tys.as_slice(), enum_ty)
             }
         };
 
@@ -235,8 +235,11 @@ pub fn ensure_trait_methods(ccx: &CrateCtxt, trait_id: ast::NodeId) {
                     let trait_def_id = local_def(trait_id);
                     let mut trait_method_def_ids = tcx.trait_method_def_ids
                                                       .borrow_mut();
-                    trait_method_def_ids.get().insert(trait_def_id,
-                                                      method_def_ids);
+                    trait_method_def_ids.get()
+                                        .insert(trait_def_id,
+                                                @method_def_ids.iter()
+                                                               .map(|x| *x)
+                                                               .collect());
                 }
                 _ => {} // Ignore things that aren't traits.
             }
@@ -575,7 +578,7 @@ pub fn convert(ccx: &CrateCtxt, it: &ast::Item) {
             write_ty_to_tcx(tcx, it.id, tpt.ty);
             get_enum_variant_types(ccx,
                                    tpt.ty,
-                                   enum_definition.variants,
+                                   enum_definition.variants.as_slice(),
                                    generics);
         },
         ast::ItemImpl(ref generics, ref opt_trait_ref, selfty, ref ms) => {
@@ -604,7 +607,7 @@ pub fn convert(ccx: &CrateCtxt, it: &ast::Item) {
 
             convert_methods(ccx,
                             ImplContainer(local_def(it.id)),
-                            *ms,
+                            ms.as_slice(),
                             selfty,
                             &i_ty_generics,
                             generics,
@@ -626,11 +629,11 @@ pub fn convert(ccx: &CrateCtxt, it: &ast::Item) {
 
             // Run convert_methods on the provided methods.
             let (_, provided_methods) =
-                split_trait_methods(*trait_methods);
+                split_trait_methods(trait_methods.as_slice());
             let untransformed_rcvr_ty = ty::mk_self(tcx, local_def(it.id));
             convert_methods(ccx,
                             TraitContainer(local_def(it.id)),
-                            provided_methods,
+                            provided_methods.as_slice(),
                             untransformed_rcvr_ty,
                             &trait_def.generics,
                             generics,
@@ -701,7 +704,8 @@ pub fn convert_struct(ccx: &CrateCtxt,
                     let mut tcache = tcx.tcache.borrow_mut();
                     tcache.get().insert(local_def(ctor_id), tpt);
                 }
-            } else if struct_def.fields[0].node.kind == ast::UnnamedField {
+            } else if struct_def.fields.get(0).node.kind ==
+                    ast::UnnamedField {
                 // Tuple-like.
                 let inputs = {
                     let tcache = tcx.tcache.borrow();
@@ -709,7 +713,10 @@ pub fn convert_struct(ccx: &CrateCtxt,
                         |field| tcache.get().get(
                             &local_def(field.node.id)).ty)
                 };
-                let ctor_fn_ty = ty::mk_ctor_fn(tcx, ctor_id, inputs, selfty);
+                let ctor_fn_ty = ty::mk_ctor_fn(tcx,
+                                                ctor_id,
+                                                inputs.as_slice(),
+                                                selfty);
                 write_ty_to_tcx(tcx, ctor_id, ctor_fn_ty);
                 {
                     let mut tcache = tcx.tcache.borrow_mut();
@@ -802,7 +809,10 @@ pub fn trait_def_of_item(ccx: &CrateCtxt, it: &ast::Item) -> @ty::TraitDef {
             let self_ty = ty::mk_self(tcx, def_id);
             let ty_generics = ty_generics(ccx, generics, 0);
             let substs = mk_item_substs(ccx, &ty_generics, Some(self_ty));
-            let bounds = ensure_supertraits(ccx, it.id, it.span, *supertraits);
+            let bounds = ensure_supertraits(ccx,
+                                            it.id,
+                                            it.span,
+                                            supertraits.as_slice());
             let trait_ref = @ty::TraitRef {def_id: def_id,
                                            substs: substs};
             let trait_def = @ty::TraitDef {generics: ty_generics,
@@ -980,7 +990,7 @@ pub fn ty_generics(ccx: &CrateCtxt,
                     def
                 }
             }
-        }))
+        }).move_iter().collect())
     };
 
     fn compute_bounds(
@@ -1032,7 +1042,10 @@ pub fn ty_of_foreign_fn_decl(ccx: &CrateCtxt,
                           -> ty::ty_param_bounds_and_ty {
     let ty_generics = ty_generics(ccx, ast_generics, 0);
     let rb = BindingRscope::new(def_id.node);
-    let input_tys = decl.inputs.map(|a| ty_of_arg(ccx, &rb, a, None) );
+    let input_tys = decl.inputs
+                        .iter()
+                        .map(|a| ty_of_arg(ccx, &rb, a, None))
+                        .collect();
     let output_ty = ast_ty_to_ty(ccx, &rb, decl.output);
 
     let t_fn = ty::mk_bare_fn(
diff --git a/src/librustc/util/ppaux.rs b/src/librustc/util/ppaux.rs
index b47143869e9fc..1384bf182a762 100644
--- a/src/librustc/util/ppaux.rs
+++ b/src/librustc/util/ppaux.rs
@@ -603,7 +603,7 @@ impl<T:Repr> Repr for OptVec<T> {
     fn repr(&self, tcx: ctxt) -> ~str {
         match *self {
             opt_vec::Empty => ~"[]",
-            opt_vec::Vec(ref v) => repr_vec(tcx, *v)
+            opt_vec::Vec(ref v) => repr_vec(tcx, v.as_slice())
         }
     }
 }
diff --git a/src/librustdoc/clean.rs b/src/librustdoc/clean.rs
index fc517a8c2e8da..ce922e7d6951f 100644
--- a/src/librustdoc/clean.rs
+++ b/src/librustdoc/clean.rs
@@ -29,6 +29,7 @@ use std;
 use doctree;
 use visit_ast;
 use std::local_data;
+use std::vec_ng::Vec;
 
 pub trait Clean<T> {
     fn clean(&self) -> T;
@@ -39,6 +40,13 @@ impl<T: Clean<U>, U> Clean<~[U]> for ~[T] {
         self.iter().map(|x| x.clean()).collect()
     }
 }
+
+impl<T: Clean<U>, U> Clean<Vec<U>> for Vec<T> {
+    fn clean(&self) -> Vec<U> {
+        self.iter().map(|x| x.clean()).collect()
+    }
+}
+
 impl<T: Clean<U>, U> Clean<U> for @T {
     fn clean(&self) -> U {
         (**self).clean()
@@ -54,10 +62,10 @@ impl<T: Clean<U>, U> Clean<Option<U>> for Option<T> {
     }
 }
 
-impl<T: Clean<U>, U> Clean<~[U]> for syntax::opt_vec::OptVec<T> {
-    fn clean(&self) -> ~[U] {
+impl<T: Clean<U>, U> Clean<Vec<U>> for syntax::opt_vec::OptVec<T> {
+    fn clean(&self) -> Vec<U> {
         match self {
-            &syntax::opt_vec::Empty => ~[],
+            &syntax::opt_vec::Empty => Vec::new(),
             &syntax::opt_vec::Vec(ref v) => v.clean()
         }
     }
@@ -196,6 +204,25 @@ impl Clean<Item> for doctree::Module {
         } else {
             ~""
         };
+        let mut foreigns = ~[];
+        for subforeigns in self.foreigns.clean().move_iter() {
+            for foreign in subforeigns.move_iter() {
+                foreigns.push(foreign)
+            }
+        }
+        let items: ~[~[Item]] = ~[
+            self.structs.clean().move_iter().collect(),
+            self.enums.clean().move_iter().collect(),
+            self.fns.clean().move_iter().collect(),
+            foreigns,
+            self.mods.clean().move_iter().collect(),
+            self.typedefs.clean().move_iter().collect(),
+            self.statics.clean().move_iter().collect(),
+            self.traits.clean().move_iter().collect(),
+            self.impls.clean().move_iter().collect(),
+            self.view_items.clean().move_iter().collect(),
+            self.macros.clean().move_iter().collect()
+        ];
         Item {
             name: Some(name),
             attrs: self.attrs.clean(),
@@ -204,12 +231,7 @@ impl Clean<Item> for doctree::Module {
             id: self.id,
             inner: ModuleItem(Module {
                is_crate: self.is_crate,
-               items: [self.structs.clean(), self.enums.clean(),
-                       self.fns.clean(), self.foreigns.clean().concat_vec(),
-                       self.mods.clean(), self.typedefs.clean(),
-                       self.statics.clean(), self.traits.clean(),
-                       self.impls.clean(), self.view_items.clean(),
-                       self.macros.clean()].concat_vec()
+               items: items.concat_vec(),
             })
         }
     }
@@ -227,7 +249,7 @@ impl Clean<Attribute> for ast::MetaItem {
         match self.node {
             ast::MetaWord(ref s) => Word(s.get().to_owned()),
             ast::MetaList(ref s, ref l) => {
-                List(s.get().to_owned(), l.clean())
+                List(s.get().to_owned(), l.clean().move_iter().collect())
             }
             ast::MetaNameValue(ref s, ref v) => {
                 NameValue(s.get().to_owned(), lit_to_str(v))
@@ -276,7 +298,7 @@ impl Clean<TyParam> for ast::TyParam {
         TyParam {
             name: self.ident.clean(),
             id: self.id,
-            bounds: self.bounds.clean(),
+            bounds: self.bounds.clean().move_iter().collect(),
         }
     }
 }
@@ -323,8 +345,8 @@ pub struct Generics {
 impl Clean<Generics> for ast::Generics {
     fn clean(&self) -> Generics {
         Generics {
-            lifetimes: self.lifetimes.clean(),
-            type_params: self.ty_params.clean(),
+            lifetimes: self.lifetimes.clean().move_iter().collect(),
+            type_params: self.ty_params.clean().move_iter().collect(),
         }
     }
 }
@@ -353,7 +375,7 @@ impl Clean<Item> for ast::Method {
         };
         Item {
             name: Some(self.ident.clean()),
-            attrs: self.attrs.clean(),
+            attrs: self.attrs.clean().move_iter().collect(),
             source: self.span.clean(),
             id: self.id.clone(),
             visibility: self.vis.clean(),
@@ -391,7 +413,7 @@ impl Clean<Item> for ast::TypeMethod {
         };
         Item {
             name: Some(self.ident.clean()),
-            attrs: self.attrs.clean(),
+            attrs: self.attrs.clean().move_iter().collect(),
             source: self.span.clean(),
             id: self.id,
             visibility: None,
@@ -464,12 +486,12 @@ impl Clean<ClosureDecl> for ast::ClosureTy {
         ClosureDecl {
             sigil: self.sigil,
             region: self.region.clean(),
-            lifetimes: self.lifetimes.clean(),
+            lifetimes: self.lifetimes.clean().move_iter().collect(),
             decl: self.decl.clean(),
             onceness: self.onceness,
             purity: self.purity,
             bounds: match self.bounds {
-                Some(ref x) => x.clean(),
+                Some(ref x) => x.clean().move_iter().collect(),
                 None        => ~[]
             },
         }
@@ -673,8 +695,11 @@ impl Clean<Type> for ast::Ty {
             TyFixedLengthVec(ty, ref e) => FixedVector(~ty.clean(),
                                                        e.span.to_src()),
             TyTup(ref tys) => Tuple(tys.iter().map(|x| x.clean()).collect()),
-            TyPath(ref p, ref tpbs, id) =>
-                resolve_type(p.clean(), tpbs.clean(), id),
+            TyPath(ref p, ref tpbs, id) => {
+                resolve_type(p.clean(),
+                             tpbs.clean().map(|x| x.move_iter().collect()),
+                             id)
+            }
             TyClosure(ref c) => Closure(~c.clean()),
             TyBareFn(ref barefn) => BareFunction(~barefn.clean()),
             TyBot => Bottom,
@@ -696,7 +721,7 @@ impl Clean<Item> for ast::StructField {
         };
         Item {
             name: name.clean(),
-            attrs: self.node.attrs.clean(),
+            attrs: self.node.attrs.clean().move_iter().collect(),
             source: self.span.clean(),
             visibility: vis,
             id: self.node.id,
@@ -755,7 +780,7 @@ impl Clean<VariantStruct> for syntax::ast::StructDef {
     fn clean(&self) -> VariantStruct {
         VariantStruct {
             struct_type: doctree::struct_type_from_def(self),
-            fields: self.fields.clean(),
+            fields: self.fields.clean().move_iter().collect(),
             fields_stripped: false,
         }
     }
@@ -862,7 +887,7 @@ impl Clean<Path> for ast::Path {
     fn clean(&self) -> Path {
         Path {
             global: self.global,
-            segments: self.segments.clean()
+            segments: self.segments.clean().move_iter().collect(),
         }
     }
 }
@@ -878,8 +903,8 @@ impl Clean<PathSegment> for ast::PathSegment {
     fn clean(&self) -> PathSegment {
         PathSegment {
             name: self.identifier.clean(),
-            lifetimes: self.lifetimes.clean(),
-            types: self.types.clean()
+            lifetimes: self.lifetimes.clean().move_iter().collect(),
+            types: self.types.clean().move_iter().collect()
         }
     }
 }
@@ -941,7 +966,7 @@ impl Clean<BareFunctionDecl> for ast::BareFnTy {
         BareFunctionDecl {
             purity: self.purity,
             generics: Generics {
-                lifetimes: self.lifetimes.clean(),
+                lifetimes: self.lifetimes.clean().move_iter().collect(),
                 type_params: ~[],
             },
             decl: self.decl.clean(),
@@ -1028,7 +1053,7 @@ impl Clean<Item> for ast::ViewItem {
     fn clean(&self) -> Item {
         Item {
             name: None,
-            attrs: self.attrs.clean(),
+            attrs: self.attrs.clean().move_iter().collect(),
             source: self.span.clean(),
             id: 0,
             visibility: self.vis.clean(),
@@ -1055,7 +1080,9 @@ impl Clean<ViewItemInner> for ast::ViewItem_ {
                 };
                 ExternMod(i.clean(), string, *id)
             }
-            &ast::ViewItemUse(ref vp) => Import(vp.clean())
+            &ast::ViewItemUse(ref vp) => {
+                Import(vp.clean().move_iter().collect())
+            }
         }
     }
 }
@@ -1083,8 +1110,10 @@ impl Clean<ViewPath> for ast::ViewPath {
                 SimpleImport(i.clean(), resolve_use_source(p.clean(), id)),
             ast::ViewPathGlob(ref p, id) =>
                 GlobImport(resolve_use_source(p.clean(), id)),
-            ast::ViewPathList(ref p, ref pl, id) =>
-                ImportList(resolve_use_source(p.clean(), id), pl.clean()),
+            ast::ViewPathList(ref p, ref pl, id) => {
+                ImportList(resolve_use_source(p.clean(), id),
+                           pl.clean().move_iter().collect())
+            }
         }
     }
 }
@@ -1104,8 +1133,8 @@ impl Clean<ViewListIdent> for ast::PathListIdent {
     }
 }
 
-impl Clean<~[Item]> for ast::ForeignMod {
-    fn clean(&self) -> ~[Item] {
+impl Clean<Vec<Item>> for ast::ForeignMod {
+    fn clean(&self) -> Vec<Item> {
         self.items.clean()
     }
 }
@@ -1130,7 +1159,7 @@ impl Clean<Item> for ast::ForeignItem {
         };
         Item {
             name: Some(self.ident.clean()),
-            attrs: self.attrs.clean(),
+            attrs: self.attrs.clean().move_iter().collect(),
             source: self.span.clean(),
             id: self.id,
             visibility: self.vis.clean(),
diff --git a/src/librustdoc/visit_ast.rs b/src/librustdoc/visit_ast.rs
index 994ee7ea03ef0..dc15b7f73a9ba 100644
--- a/src/librustdoc/visit_ast.rs
+++ b/src/librustdoc/visit_ast.rs
@@ -11,6 +11,7 @@
 //! Rust AST Visitor. Extracts useful information and massages it into a form
 //! usable for clean
 
+use std::vec_ng::Vec;
 use syntax::abi::AbiSet;
 use syntax::ast;
 use syntax::ast_util;
@@ -39,11 +40,17 @@ impl<'a> RustdocVisitor<'a> {
     }
 
     pub fn visit(&mut self, krate: &ast::Crate) {
-        self.attrs = krate.attrs.clone();
+        self.attrs = krate.attrs.iter().map(|x| (*x).clone()).collect();
 
-        self.module = self.visit_mod_contents(krate.span, krate.attrs.clone(),
-                                              ast::Public, ast::CRATE_NODE_ID,
-                                              &krate.module, None);
+        self.module = self.visit_mod_contents(krate.span,
+                                              krate.attrs
+                                                   .iter()
+                                                   .map(|x| *x)
+                                                   .collect(),
+                                              ast::Public,
+                                              ast::CRATE_NODE_ID,
+                                              &krate.module,
+                                              None);
         self.module.is_crate = true;
     }
 
@@ -56,9 +63,9 @@ impl<'a> RustdocVisitor<'a> {
             struct_type: struct_type,
             name: item.ident,
             vis: item.vis,
-            attrs: item.attrs.clone(),
+            attrs: item.attrs.iter().map(|x| *x).collect(),
             generics: generics.clone(),
-            fields: sd.fields.clone(),
+            fields: sd.fields.iter().map(|x| (*x).clone()).collect(),
             where: item.span
         }
     }
@@ -70,7 +77,7 @@ impl<'a> RustdocVisitor<'a> {
         for x in def.variants.iter() {
             vars.push(Variant {
                 name: x.node.name,
-                attrs: x.node.attrs.clone(),
+                attrs: x.node.attrs.iter().map(|x| *x).collect(),
                 vis: x.node.vis,
                 id: x.node.id,
                 kind: x.node.kind.clone(),
@@ -82,7 +89,7 @@ impl<'a> RustdocVisitor<'a> {
             variants: vars,
             vis: it.vis,
             generics: params.clone(),
-            attrs: it.attrs.clone(),
+            attrs: it.attrs.iter().map(|x| *x).collect(),
             id: it.id,
             where: it.span,
         }
@@ -95,7 +102,7 @@ impl<'a> RustdocVisitor<'a> {
         Function {
             id: item.id,
             vis: item.vis,
-            attrs: item.attrs.clone(),
+            attrs: item.attrs.iter().map(|x| *x).collect(),
             decl: fd.clone(),
             name: item.ident,
             where: item.span,
@@ -130,11 +137,11 @@ impl<'a> RustdocVisitor<'a> {
             ast::ViewItemUse(ref paths) => {
                 // rustc no longer supports "use foo, bar;"
                 assert_eq!(paths.len(), 1);
-                match self.visit_view_path(paths[0], om) {
+                match self.visit_view_path(*paths.get(0), om) {
                     None => return,
                     Some(path) => {
                         ast::ViewItem {
-                            node: ast::ViewItemUse(~[path]),
+                            node: ast::ViewItemUse(vec!(path)),
                             .. item.clone()
                         }
                     }
@@ -152,7 +159,7 @@ impl<'a> RustdocVisitor<'a> {
                 if self.resolve_id(id, false, om) { return None }
             }
             ast::ViewPathList(ref p, ref paths, ref b) => {
-                let mut mine = ~[];
+                let mut mine = Vec::new();
                 for path in paths.iter() {
                     if !self.resolve_id(path.node.id, false, om) {
                         mine.push(path.clone());
@@ -217,9 +224,15 @@ impl<'a> RustdocVisitor<'a> {
         debug!("Visiting item {:?}", item);
         match item.node {
             ast::ItemMod(ref m) => {
-                om.mods.push(self.visit_mod_contents(item.span, item.attrs.clone(),
-                                                item.vis, item.id, m,
-                                                Some(item.ident)));
+                om.mods.push(self.visit_mod_contents(item.span,
+                                                     item.attrs
+                                                         .iter()
+                                                         .map(|x| *x)
+                                                         .collect(),
+                                                     item.vis,
+                                                     item.id,
+                                                     m,
+                                                     Some(item.ident)));
             },
             ast::ItemEnum(ref ed, ref gen) =>
                 om.enums.push(self.visit_enum_def(item, ed, gen)),
@@ -233,7 +246,7 @@ impl<'a> RustdocVisitor<'a> {
                     gen: gen.clone(),
                     name: item.ident,
                     id: item.id,
-                    attrs: item.attrs.clone(),
+                    attrs: item.attrs.iter().map(|x| *x).collect(),
                     where: item.span,
                     vis: item.vis,
                 };
@@ -246,7 +259,7 @@ impl<'a> RustdocVisitor<'a> {
                     expr: exp.clone(),
                     id: item.id,
                     name: item.ident,
-                    attrs: item.attrs.clone(),
+                    attrs: item.attrs.iter().map(|x| *x).collect(),
                     where: item.span,
                     vis: item.vis,
                 };
@@ -255,11 +268,11 @@ impl<'a> RustdocVisitor<'a> {
             ast::ItemTrait(ref gen, ref tr, ref met) => {
                 let t = Trait {
                     name: item.ident,
-                    methods: met.clone(),
+                    methods: met.iter().map(|x| (*x).clone()).collect(),
                     generics: gen.clone(),
-                    parents: tr.clone(),
+                    parents: tr.iter().map(|x| (*x).clone()).collect(),
                     id: item.id,
-                    attrs: item.attrs.clone(),
+                    attrs: item.attrs.iter().map(|x| *x).collect(),
                     where: item.span,
                     vis: item.vis,
                 };
@@ -270,8 +283,8 @@ impl<'a> RustdocVisitor<'a> {
                     generics: gen.clone(),
                     trait_: tr.clone(),
                     for_: ty,
-                    methods: meths.clone(),
-                    attrs: item.attrs.clone(),
+                    methods: meths.iter().map(|x| *x).collect(),
+                    attrs: item.attrs.iter().map(|x| *x).collect(),
                     id: item.id,
                     where: item.span,
                     vis: item.vis,
@@ -284,7 +297,7 @@ impl<'a> RustdocVisitor<'a> {
             ast::ItemMac(ref _m) => {
                 om.macros.push(Macro {
                     id: item.id,
-                    attrs: item.attrs.clone(),
+                    attrs: item.attrs.iter().map(|x| *x).collect(),
                     name: item.ident,
                     where: item.span,
                 })
diff --git a/src/libstd/hash/mod.rs b/src/libstd/hash/mod.rs
index 027a1d9010e3e..0d319c5d74ef9 100644
--- a/src/libstd/hash/mod.rs
+++ b/src/libstd/hash/mod.rs
@@ -70,6 +70,7 @@ use option::{Option, Some, None};
 use rc::Rc;
 use str::{Str, StrSlice};
 use vec::{Vector, ImmutableVector};
+use vec_ng::Vec;
 
 /// Reexport the `sip::hash` function as our default hasher.
 pub use hash = self::sip::hash;
@@ -207,6 +208,13 @@ impl<S: Writer, T: Hash<S>> Hash<S> for ~[T] {
     }
 }
 
+impl<S: Writer, T: Hash<S>> Hash<S> for Vec<T> {
+    #[inline]
+    fn hash(&self, state: &mut S) {
+        self.as_slice().hash(state);
+    }
+}
+
 impl<'a, S: Writer, T: Hash<S>> Hash<S> for &'a T {
     #[inline]
     fn hash(&self, state: &mut S) {
diff --git a/src/libstd/vec_ng.rs b/src/libstd/vec_ng.rs
index 52d3405f8c148..9b6acdd9b9ee5 100644
--- a/src/libstd/vec_ng.rs
+++ b/src/libstd/vec_ng.rs
@@ -15,6 +15,8 @@ use cast::{forget, transmute};
 use clone::Clone;
 use cmp::{Eq, Ordering, TotalEq, TotalOrd};
 use container::Container;
+use default::Default;
+use fmt;
 use iter::{DoubleEndedIterator, FromIterator, Iterator};
 use libc::{free, c_void};
 use mem::{size_of, move_val_init};
@@ -26,7 +28,8 @@ use ptr::RawPtr;
 use ptr;
 use rt::global_heap::{malloc_raw, realloc_raw};
 use raw::Slice;
-use vec::{ImmutableVector, Items, MutItems, MutableVector, RevItems};
+use vec::{ImmutableEqVector, ImmutableVector, Items, MutItems, MutableVector};
+use vec::{RevItems};
 
 pub struct Vec<T> {
     priv len: uint,
@@ -80,6 +83,26 @@ impl<T: Clone> Vec<T> {
             self.push((*element).clone())
         }
     }
+
+
+    pub fn grow(&mut self, n: uint, initval: &T) {
+        let new_len = self.len() + n;
+        self.reserve(new_len);
+        let mut i: uint = 0u;
+
+        while i < n {
+            self.push((*initval).clone());
+            i += 1u;
+        }
+    }
+
+    pub fn grow_set(&mut self, index: uint, initval: &T, val: T) {
+        let l = self.len();
+        if index >= l {
+            self.grow(index - l + 1u, initval);
+        }
+        *self.get_mut(index) = val;
+    }
 }
 
 impl<T:Clone> Clone for Vec<T> {
@@ -340,6 +363,18 @@ impl<T> Vec<T> {
     pub fn slice_from<'a>(&'a self, start: uint) -> &'a [T] {
         self.as_slice().slice_from(start)
     }
+
+    #[inline]
+    pub fn init<'a>(&'a self) -> &'a [T] {
+        self.slice(0, self.len() - 1)
+    }
+}
+
+impl<T:Eq> Vec<T> {
+    /// Return true if a vector contains an element with the given value
+    pub fn contains(&self, x: &T) -> bool {
+        self.as_slice().contains(x)
+    }
 }
 
 #[inline]
@@ -348,6 +383,14 @@ pub fn append<T:Clone>(mut first: Vec<T>, second: &[T]) -> Vec<T> {
     first
 }
 
+/// Appends one element to the vector provided. The vector itself is then
+/// returned for use again.
+#[inline]
+pub fn append_one<T>(mut lhs: Vec<T>, x: T) -> Vec<T> {
+    lhs.push(x);
+    lhs
+}
+
 #[unsafe_destructor]
 impl<T> Drop for Vec<T> {
     fn drop(&mut self) {
@@ -360,6 +403,18 @@ impl<T> Drop for Vec<T> {
     }
 }
 
+impl<T> Default for Vec<T> {
+    fn default() -> Vec<T> {
+        Vec::new()
+    }
+}
+
+impl<T:fmt::Show> fmt::Show for Vec<T> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        self.as_slice().fmt(f)
+    }
+}
+
 pub struct MoveItems<T> {
     priv allocation: *mut c_void, // the block of memory allocated for the vector
     priv iter: Items<'static, T>
diff --git a/src/libsyntax/abi.rs b/src/libsyntax/abi.rs
index 861cd8ae7d301..a06415bc083a8 100644
--- a/src/libsyntax/abi.rs
+++ b/src/libsyntax/abi.rs
@@ -9,6 +9,7 @@
 // except according to those terms.
 
 use std::fmt;
+use std::vec_ng::Vec;
 use std::fmt::Show;
 
 #[deriving(Eq)]
@@ -117,8 +118,8 @@ pub fn lookup(name: &str) -> Option<Abi> {
     res
 }
 
-pub fn all_names() -> ~[&'static str] {
-    AbiDatas.map(|d| d.name)
+pub fn all_names() -> Vec<&'static str> {
+    AbiDatas.iter().map(|d| d.name).collect()
 }
 
 impl Abi {
@@ -232,7 +233,7 @@ impl AbiSet {
     }
 
     pub fn check_valid(&self) -> Option<(Abi, Abi)> {
-        let mut abis = ~[];
+        let mut abis = Vec::new();
         self.each(|abi| { abis.push(abi); true });
 
         for (i, abi) in abis.iter().enumerate() {
diff --git a/src/libsyntax/ast.rs b/src/libsyntax/ast.rs
index f6dca713e711e..947463d8f47b1 100644
--- a/src/libsyntax/ast.rs
+++ b/src/libsyntax/ast.rs
@@ -23,6 +23,7 @@ use std::cell::RefCell;
 use collections::HashMap;
 use std::option::Option;
 use std::rc::Rc;
+use std::vec_ng::Vec;
 use serialize::{Encodable, Decodable, Encoder, Decoder};
 
 /// A pointer abstraction. FIXME(eddyb) #10676 use Rc<T> in the future.
@@ -98,7 +99,7 @@ pub type SyntaxContext = u32;
 // it should cut down on memory use *a lot*; applying a mark
 // to a tree containing 50 identifiers would otherwise generate
 pub struct SCTable {
-    table: RefCell<~[SyntaxContext_]>,
+    table: RefCell<Vec<SyntaxContext_> >,
     mark_memo: RefCell<HashMap<(SyntaxContext,Mrk),SyntaxContext>>,
     rename_memo: RefCell<HashMap<(SyntaxContext,Ident,Name),SyntaxContext>>,
 }
@@ -164,7 +165,7 @@ pub struct Path {
     /// module (like paths in an import).
     global: bool,
     /// The segments in the path: the things separated by `::`.
-    segments: ~[PathSegment],
+    segments: Vec<PathSegment> ,
 }
 
 /// A segment of a path: an identifier, an optional lifetime, and a set of
@@ -288,12 +289,12 @@ pub enum DefRegion {
 
 // The set of MetaItems that define the compilation environment of the crate,
 // used to drive conditional compilation
-pub type CrateConfig = ~[@MetaItem];
+pub type CrateConfig = Vec<@MetaItem> ;
 
 #[deriving(Clone, Eq, Encodable, Decodable, Hash)]
 pub struct Crate {
     module: Mod,
-    attrs: ~[Attribute],
+    attrs: Vec<Attribute> ,
     config: CrateConfig,
     span: Span,
 }
@@ -303,7 +304,7 @@ pub type MetaItem = Spanned<MetaItem_>;
 #[deriving(Clone, Encodable, Decodable, Hash)]
 pub enum MetaItem_ {
     MetaWord(InternedString),
-    MetaList(InternedString, ~[@MetaItem]),
+    MetaList(InternedString, Vec<@MetaItem> ),
     MetaNameValue(InternedString, Lit),
 }
 
@@ -334,8 +335,8 @@ impl Eq for MetaItem_ {
 
 #[deriving(Clone, Eq, Encodable, Decodable, Hash)]
 pub struct Block {
-    view_items: ~[ViewItem],
-    stmts: ~[@Stmt],
+    view_items: Vec<ViewItem> ,
+    stmts: Vec<@Stmt> ,
     expr: Option<@Expr>,
     id: NodeId,
     rules: BlockCheckMode,
@@ -373,17 +374,17 @@ pub enum Pat_ {
     // records this pattern's NodeId in an auxiliary
     // set (of "pat_idents that refer to nullary enums")
     PatIdent(BindingMode, Path, Option<@Pat>),
-    PatEnum(Path, Option<~[@Pat]>), /* "none" means a * pattern where
+    PatEnum(Path, Option<Vec<@Pat> >), /* "none" means a * pattern where
                                      * we don't bind the fields to names */
-    PatStruct(Path, ~[FieldPat], bool),
-    PatTup(~[@Pat]),
+    PatStruct(Path, Vec<FieldPat> , bool),
+    PatTup(Vec<@Pat> ),
     PatUniq(@Pat),
     PatRegion(@Pat), // reference pattern
     PatLit(@Expr),
     PatRange(@Expr, @Expr),
     // [a, b, ..i, y, z] is represented as
     // PatVec(~[a, b], Some(i), ~[y, z])
-    PatVec(~[@Pat], Option<@Pat>, ~[@Pat])
+    PatVec(Vec<@Pat> , Option<@Pat>, Vec<@Pat> )
 }
 
 #[deriving(Clone, Eq, Encodable, Decodable, Hash)]
@@ -488,7 +489,7 @@ pub enum Decl_ {
 
 #[deriving(Clone, Eq, Encodable, Decodable, Hash)]
 pub struct Arm {
-    pats: ~[@Pat],
+    pats: Vec<@Pat> ,
     guard: Option<@Expr>,
     body: P<Block>,
 }
@@ -526,10 +527,10 @@ pub enum Expr_ {
     ExprVstore(@Expr, ExprVstore),
     // First expr is the place; second expr is the value.
     ExprBox(@Expr, @Expr),
-    ExprVec(~[@Expr], Mutability),
-    ExprCall(@Expr, ~[@Expr]),
-    ExprMethodCall(Ident, ~[P<Ty>], ~[@Expr]),
-    ExprTup(~[@Expr]),
+    ExprVec(Vec<@Expr> , Mutability),
+    ExprCall(@Expr, Vec<@Expr> ),
+    ExprMethodCall(Ident, Vec<P<Ty>> , Vec<@Expr> ),
+    ExprTup(Vec<@Expr> ),
     ExprBinary(BinOp, @Expr, @Expr),
     ExprUnary(UnOp, @Expr),
     ExprLit(@Lit),
@@ -541,14 +542,14 @@ pub enum Expr_ {
     // Conditionless loop (can be exited with break, cont, or ret)
     // FIXME #6993: change to Option<Name>
     ExprLoop(P<Block>, Option<Ident>),
-    ExprMatch(@Expr, ~[Arm]),
+    ExprMatch(@Expr, Vec<Arm> ),
     ExprFnBlock(P<FnDecl>, P<Block>),
     ExprProc(P<FnDecl>, P<Block>),
     ExprBlock(P<Block>),
 
     ExprAssign(@Expr, @Expr),
     ExprAssignOp(BinOp, @Expr, @Expr),
-    ExprField(@Expr, Ident, ~[P<Ty>]),
+    ExprField(@Expr, Ident, Vec<P<Ty>> ),
     ExprIndex(@Expr, @Expr),
 
     /// Expression that looks like a "name". For example,
@@ -569,7 +570,7 @@ pub enum Expr_ {
     ExprMac(Mac),
 
     // A struct literal expression.
-    ExprStruct(Path, ~[Field], Option<@Expr> /* base */),
+    ExprStruct(Path, Vec<Field> , Option<@Expr> /* base */),
 
     // A vector literal constructed from one repeated element.
     ExprRepeat(@Expr /* element */, @Expr /* count */, Mutability),
@@ -600,14 +601,14 @@ pub enum TokenTree {
     TTTok(Span, ::parse::token::Token),
     // a delimited sequence (the delimiters appear as the first
     // and last elements of the vector)
-    TTDelim(@~[TokenTree]),
+    TTDelim(@Vec<TokenTree> ),
 
     // These only make sense for right-hand-sides of MBE macros:
 
     // a kleene-style repetition sequence with a span, a TTForest,
     // an optional separator, and a boolean where true indicates
     // zero or more (..), and false indicates one or more (+).
-    TTSeq(Span, @~[TokenTree], Option<::parse::token::Token>, bool),
+    TTSeq(Span, @Vec<TokenTree> , Option<::parse::token::Token>, bool),
 
     // a syntactic variable that will be filled in by macro expansion.
     TTNonterminal(Span, Ident)
@@ -673,7 +674,7 @@ pub enum Matcher_ {
     MatchTok(::parse::token::Token),
     // match repetitions of a sequence: body, separator, zero ok?,
     // lo, hi position-in-match-array used:
-    MatchSeq(~[Matcher], Option<::parse::token::Token>, bool, uint, uint),
+    MatchSeq(Vec<Matcher> , Option<::parse::token::Token>, bool, uint, uint),
     // parse a Rust NT: name to bind, name of NT, position in match array:
     MatchNonterminal(Ident, Ident, uint)
 }
@@ -686,7 +687,7 @@ pub type Mac = Spanned<Mac_>;
 // There's only one flavor, now, so this could presumably be simplified.
 #[deriving(Clone, Eq, Encodable, Decodable, Hash)]
 pub enum Mac_ {
-    MacInvocTT(Path, ~[TokenTree], SyntaxContext),   // new macro-invocation
+    MacInvocTT(Path, Vec<TokenTree> , SyntaxContext),   // new macro-invocation
 }
 
 #[deriving(Clone, Eq, Encodable, Decodable, Hash)]
@@ -700,7 +701,7 @@ pub type Lit = Spanned<Lit_>;
 #[deriving(Clone, Eq, Encodable, Decodable, Hash)]
 pub enum Lit_ {
     LitStr(InternedString, StrStyle),
-    LitBinary(Rc<~[u8]>),
+    LitBinary(Rc<Vec<u8> >),
     LitChar(u32),
     LitInt(i64, IntTy),
     LitUint(u64, UintTy),
@@ -729,7 +730,7 @@ pub struct TypeField {
 #[deriving(Clone, Eq, Encodable, Decodable, Hash)]
 pub struct TypeMethod {
     ident: Ident,
-    attrs: ~[Attribute],
+    attrs: Vec<Attribute> ,
     purity: Purity,
     decl: P<FnDecl>,
     generics: Generics,
@@ -858,7 +859,7 @@ pub enum Ty_ {
     TyRptr(Option<Lifetime>, MutTy),
     TyClosure(@ClosureTy),
     TyBareFn(@BareFnTy),
-    TyTup(~[P<Ty>]),
+    TyTup(Vec<P<Ty>> ),
     TyPath(Path, Option<OptVec<TyParamBound>>, NodeId), // for #7264; see above
     TyTypeof(@Expr),
     // TyInfer means the type should be inferred instead of it having been
@@ -878,8 +879,8 @@ pub struct InlineAsm {
     asm: InternedString,
     asm_str_style: StrStyle,
     clobbers: InternedString,
-    inputs: ~[(InternedString, @Expr)],
-    outputs: ~[(InternedString, @Expr)],
+    inputs: Vec<(InternedString, @Expr)> ,
+    outputs: Vec<(InternedString, @Expr)> ,
     volatile: bool,
     alignstack: bool,
     dialect: AsmDialect
@@ -914,7 +915,7 @@ impl Arg {
 
 #[deriving(Clone, Eq, Encodable, Decodable, Hash)]
 pub struct FnDecl {
-    inputs: ~[Arg],
+    inputs: Vec<Arg> ,
     output: P<Ty>,
     cf: RetStyle,
     variadic: bool
@@ -957,7 +958,7 @@ pub type ExplicitSelf = Spanned<ExplicitSelf_>;
 #[deriving(Eq, Encodable, Decodable, Hash)]
 pub struct Method {
     ident: Ident,
-    attrs: ~[Attribute],
+    attrs: Vec<Attribute> ,
     generics: Generics,
     explicit_self: ExplicitSelf,
     purity: Purity,
@@ -970,15 +971,15 @@ pub struct Method {
 
 #[deriving(Clone, Eq, Encodable, Decodable, Hash)]
 pub struct Mod {
-    view_items: ~[ViewItem],
-    items: ~[@Item],
+    view_items: Vec<ViewItem> ,
+    items: Vec<@Item> ,
 }
 
 #[deriving(Clone, Eq, Encodable, Decodable, Hash)]
 pub struct ForeignMod {
     abis: AbiSet,
-    view_items: ~[ViewItem],
-    items: ~[@ForeignItem],
+    view_items: Vec<ViewItem> ,
+    items: Vec<@ForeignItem> ,
 }
 
 #[deriving(Clone, Eq, Encodable, Decodable, Hash)]
@@ -989,19 +990,19 @@ pub struct VariantArg {
 
 #[deriving(Clone, Eq, Encodable, Decodable, Hash)]
 pub enum VariantKind {
-    TupleVariantKind(~[VariantArg]),
+    TupleVariantKind(Vec<VariantArg> ),
     StructVariantKind(@StructDef),
 }
 
 #[deriving(Clone, Eq, Encodable, Decodable, Hash)]
 pub struct EnumDef {
-    variants: ~[P<Variant>],
+    variants: Vec<P<Variant>> ,
 }
 
 #[deriving(Clone, Eq, Encodable, Decodable, Hash)]
 pub struct Variant_ {
     name: Ident,
-    attrs: ~[Attribute],
+    attrs: Vec<Attribute> ,
     kind: VariantKind,
     id: NodeId,
     disr_expr: Option<@Expr>,
@@ -1034,13 +1035,13 @@ pub enum ViewPath_ {
     ViewPathGlob(Path, NodeId),
 
     // foo::bar::{a,b,c}
-    ViewPathList(Path, ~[PathListIdent], NodeId)
+    ViewPathList(Path, Vec<PathListIdent> , NodeId)
 }
 
 #[deriving(Clone, Eq, Encodable, Decodable, Hash)]
 pub struct ViewItem {
     node: ViewItem_,
-    attrs: ~[Attribute],
+    attrs: Vec<Attribute> ,
     vis: Visibility,
     span: Span,
 }
@@ -1052,7 +1053,7 @@ pub enum ViewItem_ {
     // (containing arbitrary characters) from which to fetch the crate sources
     // For example, extern crate whatever = "github.com/mozilla/rust"
     ViewItemExternMod(Ident, Option<(InternedString,StrStyle)>, NodeId),
-    ViewItemUse(~[@ViewPath]),
+    ViewItemUse(Vec<@ViewPath> ),
 }
 
 // Meta-data associated with an item
@@ -1109,7 +1110,7 @@ pub struct StructField_ {
     kind: StructFieldKind,
     id: NodeId,
     ty: P<Ty>,
-    attrs: ~[Attribute],
+    attrs: Vec<Attribute> ,
 }
 
 pub type StructField = Spanned<StructField_>;
@@ -1122,7 +1123,7 @@ pub enum StructFieldKind {
 
 #[deriving(Eq, Encodable, Decodable, Hash)]
 pub struct StructDef {
-    fields: ~[StructField], /* fields, not including ctor */
+    fields: Vec<StructField> , /* fields, not including ctor */
     /* ID of the constructor. This is only used for tuple- or enum-like
      * structs. */
     ctor_id: Option<NodeId>
@@ -1135,7 +1136,7 @@ pub struct StructDef {
 #[deriving(Clone, Eq, Encodable, Decodable, Hash)]
 pub struct Item {
     ident: Ident,
-    attrs: ~[Attribute],
+    attrs: Vec<Attribute> ,
     id: NodeId,
     node: Item_,
     vis: Visibility,
@@ -1151,11 +1152,11 @@ pub enum Item_ {
     ItemTy(P<Ty>, Generics),
     ItemEnum(EnumDef, Generics),
     ItemStruct(@StructDef, Generics),
-    ItemTrait(Generics, ~[TraitRef], ~[TraitMethod]),
+    ItemTrait(Generics, Vec<TraitRef> , Vec<TraitMethod> ),
     ItemImpl(Generics,
              Option<TraitRef>, // (optional) trait this impl implements
              P<Ty>, // self
-             ~[@Method]),
+             Vec<@Method> ),
     // a macro invocation (which includes macro definition)
     ItemMac(Mac),
 }
@@ -1163,7 +1164,7 @@ pub enum Item_ {
 #[deriving(Eq, Encodable, Decodable, Hash)]
 pub struct ForeignItem {
     ident: Ident,
-    attrs: ~[Attribute],
+    attrs: Vec<Attribute> ,
     node: ForeignItem_,
     id: NodeId,
     span: Span,
@@ -1193,6 +1194,8 @@ mod test {
     use codemap::*;
     use super::*;
 
+    use std::vec_ng::Vec;
+
     fn is_freeze<T: Freeze>() {}
 
     // Assert that the AST remains Freeze (#10693).
@@ -1205,9 +1208,9 @@ mod test {
     #[test]
     fn check_asts_encodable() {
         let e = Crate {
-            module: Mod {view_items: ~[], items: ~[]},
-            attrs: ~[],
-            config: ~[],
+            module: Mod {view_items: Vec::new(), items: Vec::new()},
+            attrs: Vec::new(),
+            config: Vec::new(),
             span: Span {
                 lo: BytePos(10),
                 hi: BytePos(20),
diff --git a/src/libsyntax/ast_map.rs b/src/libsyntax/ast_map.rs
index 31c258b36c02b..56a99736866f6 100644
--- a/src/libsyntax/ast_map.rs
+++ b/src/libsyntax/ast_map.rs
@@ -23,6 +23,7 @@ use std::cell::RefCell;
 use std::iter;
 use std::vec;
 use std::fmt;
+use std::vec_ng::Vec;
 
 #[deriving(Clone, Eq)]
 pub enum PathElem {
@@ -134,7 +135,7 @@ enum MapEntry {
 }
 
 struct InlinedParent {
-    path: ~[PathElem],
+    path: Vec<PathElem> ,
     // Required by NodeTraitMethod and NodeMethod.
     def_id: DefId
 }
@@ -185,13 +186,17 @@ pub struct Map {
     ///
     /// Also, indexing is pretty quick when you've got a vector and
     /// plain old integers.
-    priv map: RefCell<~[MapEntry]>
+    priv map: RefCell<Vec<MapEntry> >
 }
 
 impl Map {
     fn find_entry(&self, id: NodeId) -> Option<MapEntry> {
         let map = self.map.borrow();
-        map.get().get(id as uint).map(|x| *x)
+        if map.get().len() > id as uint {
+            Some(*map.get().get(id as uint))
+        } else {
+            None
+        }
     }
 
     /// Retrieve the Node corresponding to `id`, failing if it cannot
@@ -522,7 +527,7 @@ impl<'a, F: FoldOps> Folder for Ctx<'a, F> {
 }
 
 pub fn map_crate<F: FoldOps>(krate: Crate, fold_ops: F) -> (Crate, Map) {
-    let map = Map { map: RefCell::new(~[]) };
+    let map = Map { map: RefCell::new(Vec::new()) };
     let krate = {
         let mut cx = Ctx {
             map: &map,
@@ -557,7 +562,7 @@ pub fn map_crate<F: FoldOps>(krate: Crate, fold_ops: F) -> (Crate, Map) {
 // crate.  The `path` should be the path to the item but should not include
 // the item itself.
 pub fn map_decoded_item<F: FoldOps>(map: &Map,
-                                    path: ~[PathElem],
+                                    path: Vec<PathElem> ,
                                     fold_ops: F,
                                     fold: |&mut Ctx<F>| -> InlinedItem)
                                     -> InlinedItem {
diff --git a/src/libsyntax/ast_util.rs b/src/libsyntax/ast_util.rs
index 4cf4aefa0e2a8..db9ea480e9620 100644
--- a/src/libsyntax/ast_util.rs
+++ b/src/libsyntax/ast_util.rs
@@ -23,6 +23,7 @@ use std::cmp;
 use collections::HashMap;
 use std::u32;
 use std::local_data;
+use std::vec_ng::Vec;
 
 pub fn path_name_i(idents: &[Ident]) -> ~str {
     // FIXME: Bad copies (#2543 -- same for everything else that says "bad")
@@ -180,8 +181,8 @@ pub fn is_call_expr(e: @Expr) -> bool {
 
 pub fn block_from_expr(e: @Expr) -> P<Block> {
     P(Block {
-        view_items: ~[],
-        stmts: ~[],
+        view_items: Vec::new(),
+        stmts: Vec::new(),
         expr: Some(e),
         id: e.id,
         rules: DefaultBlock,
@@ -193,13 +194,13 @@ pub fn ident_to_path(s: Span, identifier: Ident) -> Path {
     ast::Path {
         span: s,
         global: false,
-        segments: ~[
+        segments: vec!(
             ast::PathSegment {
                 identifier: identifier,
                 lifetimes: opt_vec::Empty,
                 types: opt_vec::Empty,
             }
-        ],
+        ),
     }
 }
 
@@ -216,7 +217,7 @@ pub fn is_unguarded(a: &Arm) -> bool {
     }
 }
 
-pub fn unguarded_pat(a: &Arm) -> Option<~[@Pat]> {
+pub fn unguarded_pat(a: &Arm) -> Option<Vec<@Pat> > {
     if is_unguarded(a) {
         Some(/* FIXME (#2543) */ a.pats.clone())
     } else {
@@ -241,7 +242,7 @@ pub fn impl_pretty_name(trait_ref: &Option<TraitRef>, ty: &Ty) -> Ident {
     token::gensym_ident(pretty)
 }
 
-pub fn public_methods(ms: ~[@Method]) -> ~[@Method] {
+pub fn public_methods(ms: Vec<@Method> ) -> Vec<@Method> {
     ms.move_iter().filter(|m| {
         match m.vis {
             Public => true,
@@ -271,9 +272,9 @@ pub fn trait_method_to_ty_method(method: &TraitMethod) -> TypeMethod {
 }
 
 pub fn split_trait_methods(trait_methods: &[TraitMethod])
-    -> (~[TypeMethod], ~[@Method]) {
-    let mut reqd = ~[];
-    let mut provd = ~[];
+    -> (Vec<TypeMethod> , Vec<@Method> ) {
+    let mut reqd = Vec::new();
+    let mut provd = Vec::new();
     for trt_method in trait_methods.iter() {
         match *trt_method {
             Required(ref tm) => reqd.push((*tm).clone()),
@@ -724,7 +725,7 @@ pub fn new_rename_internal(id: Ident,
 // FIXME #8215 : currently pub to allow testing
 pub fn new_sctable_internal() -> SCTable {
     SCTable {
-        table: RefCell::new(~[EmptyCtxt,IllegalCtxt]),
+        table: RefCell::new(vec!(EmptyCtxt,IllegalCtxt)),
         mark_memo: RefCell::new(HashMap::new()),
         rename_memo: RefCell::new(HashMap::new()),
     }
@@ -754,7 +755,7 @@ pub fn display_sctable(table : &SCTable) {
 
 
 /// Add a value to the end of a vec, return its index
-fn idx_push<T>(vec: &mut ~[T], val: T) -> u32 {
+fn idx_push<T>(vec: &mut Vec<T> , val: T) -> u32 {
     vec.push(val);
     (vec.len() - 1) as u32
 }
@@ -795,7 +796,7 @@ pub fn resolve_internal(id : Ident,
             let resolved = {
                 let result = {
                     let table = table.table.borrow();
-                    table.get()[id.ctxt]
+                    *table.get().get(id.ctxt as uint)
                 };
                 match result {
                     EmptyCtxt => id.name,
@@ -831,20 +832,20 @@ pub fn resolve_internal(id : Ident,
 }
 
 /// Compute the marks associated with a syntax context.
-pub fn mtwt_marksof(ctxt: SyntaxContext, stopname: Name) -> ~[Mrk] {
+pub fn mtwt_marksof(ctxt: SyntaxContext, stopname: Name) -> Vec<Mrk> {
     marksof(ctxt, stopname, get_sctable())
 }
 
 // the internal function for computing marks
 // it's not clear to me whether it's better to use a [] mutable
 // vector or a cons-list for this.
-pub fn marksof(ctxt: SyntaxContext, stopname: Name, table: &SCTable) -> ~[Mrk] {
-    let mut result = ~[];
+pub fn marksof(ctxt: SyntaxContext, stopname: Name, table: &SCTable) -> Vec<Mrk> {
+    let mut result = Vec::new();
     let mut loopvar = ctxt;
     loop {
         let table_entry = {
             let table = table.table.borrow();
-            table.get()[loopvar]
+            *table.get().get(loopvar as uint)
         };
         match table_entry {
             EmptyCtxt => {
@@ -873,7 +874,7 @@ pub fn marksof(ctxt: SyntaxContext, stopname: Name, table: &SCTable) -> ~[Mrk] {
 pub fn mtwt_outer_mark(ctxt: SyntaxContext) -> Mrk {
     let sctable = get_sctable();
     let table = sctable.table.borrow();
-    match table.get()[ctxt] {
+    match *table.get().get(ctxt as uint) {
         ast::Mark(mrk,_) => mrk,
         _ => fail!("can't retrieve outer mark when outside is not a mark")
     }
@@ -881,7 +882,7 @@ pub fn mtwt_outer_mark(ctxt: SyntaxContext) -> Mrk {
 
 /// Push a name... unless it matches the one on top, in which
 /// case pop and discard (so two of the same marks cancel)
-pub fn xorPush(marks: &mut ~[Mrk], mark: Mrk) {
+pub fn xorPush(marks: &mut Vec<Mrk> , mark: Mrk) {
     if (marks.len() > 0) && (getLast(marks) == mark) {
         marks.pop().unwrap();
     } else {
@@ -891,7 +892,7 @@ pub fn xorPush(marks: &mut ~[Mrk], mark: Mrk) {
 
 // get the last element of a mutable array.
 // FIXME #4903: , must be a separate procedure for now.
-pub fn getLast(arr: &~[Mrk]) -> Mrk {
+pub fn getLast(arr: &Vec<Mrk> ) -> Mrk {
     *arr.last().unwrap()
 }
 
@@ -901,7 +902,7 @@ pub fn getLast(arr: &~[Mrk]) -> Mrk {
 pub fn path_name_eq(a : &ast::Path, b : &ast::Path) -> bool {
     (a.span == b.span)
     && (a.global == b.global)
-    && (segments_name_eq(a.segments, b.segments))
+    && (segments_name_eq(a.segments.as_slice(), b.segments.as_slice()))
 }
 
 // are two arrays of segments equal when compared unhygienically?
@@ -938,6 +939,8 @@ mod test {
     use opt_vec;
     use collections::HashMap;
 
+    use std::vec_ng::Vec;
+
     fn ident_to_segment(id : &Ident) -> PathSegment {
         PathSegment {identifier:id.clone(),
                      lifetimes: opt_vec::Empty,
@@ -956,21 +959,21 @@ mod test {
     }
 
     #[test] fn xorpush_test () {
-        let mut s = ~[];
+        let mut s = Vec::new();
         xorPush(&mut s, 14);
-        assert_eq!(s.clone(), ~[14]);
+        assert_eq!(s.clone(), vec!(14));
         xorPush(&mut s, 14);
-        assert_eq!(s.clone(), ~[]);
+        assert_eq!(s.clone(), Vec::new());
         xorPush(&mut s, 14);
-        assert_eq!(s.clone(), ~[14]);
+        assert_eq!(s.clone(), vec!(14));
         xorPush(&mut s, 15);
-        assert_eq!(s.clone(), ~[14, 15]);
+        assert_eq!(s.clone(), vec!(14, 15));
         xorPush(&mut s, 16);
-        assert_eq!(s.clone(), ~[14, 15, 16]);
+        assert_eq!(s.clone(), vec!(14, 15, 16));
         xorPush(&mut s, 16);
-        assert_eq!(s.clone(), ~[14, 15]);
+        assert_eq!(s.clone(), vec!(14, 15));
         xorPush(&mut s, 15);
-        assert_eq!(s.clone(), ~[14]);
+        assert_eq!(s.clone(), vec!(14));
     }
 
     fn id(n: Name, s: SyntaxContext) -> Ident {
@@ -987,7 +990,7 @@ mod test {
 
     // unfold a vector of TestSC values into a SCTable,
     // returning the resulting index
-    fn unfold_test_sc(tscs : ~[TestSC], tail: SyntaxContext, table: &SCTable)
+    fn unfold_test_sc(tscs : Vec<TestSC> , tail: SyntaxContext, table: &SCTable)
         -> SyntaxContext {
         tscs.rev_iter().fold(tail, |tail : SyntaxContext, tsc : &TestSC|
                   {match *tsc {
@@ -996,11 +999,11 @@ mod test {
     }
 
     // gather a SyntaxContext back into a vector of TestSCs
-    fn refold_test_sc(mut sc: SyntaxContext, table : &SCTable) -> ~[TestSC] {
-        let mut result = ~[];
+    fn refold_test_sc(mut sc: SyntaxContext, table : &SCTable) -> Vec<TestSC> {
+        let mut result = Vec::new();
         loop {
             let table = table.table.borrow();
-            match table.get()[sc] {
+            match *table.get().get(sc as uint) {
                 EmptyCtxt => {return result;},
                 Mark(mrk,tail) => {
                     result.push(M(mrk));
@@ -1020,20 +1023,20 @@ mod test {
     #[test] fn test_unfold_refold(){
         let mut t = new_sctable_internal();
 
-        let test_sc = ~[M(3),R(id(101,0),14),M(9)];
+        let test_sc = vec!(M(3),R(id(101,0),14),M(9));
         assert_eq!(unfold_test_sc(test_sc.clone(),EMPTY_CTXT,&mut t),4);
         {
             let table = t.table.borrow();
-            assert!(table.get()[2] == Mark(9,0));
-            assert!(table.get()[3] == Rename(id(101,0),14,2));
-            assert!(table.get()[4] == Mark(3,3));
+            assert!(*table.get().get(2) == Mark(9,0));
+            assert!(*table.get().get(3) == Rename(id(101,0),14,2));
+            assert!(*table.get().get(4) == Mark(3,3));
         }
         assert_eq!(refold_test_sc(4,&t),test_sc);
     }
 
     // extend a syntax context with a sequence of marks given
     // in a vector. v[0] will be the outermost mark.
-    fn unfold_marks(mrks: ~[Mrk], tail: SyntaxContext, table: &SCTable)
+    fn unfold_marks(mrks: Vec<Mrk> , tail: SyntaxContext, table: &SCTable)
                     -> SyntaxContext {
         mrks.rev_iter().fold(tail, |tail:SyntaxContext, mrk:&Mrk|
                    {new_mark_internal(*mrk,tail,table)})
@@ -1042,11 +1045,11 @@ mod test {
     #[test] fn unfold_marks_test() {
         let mut t = new_sctable_internal();
 
-        assert_eq!(unfold_marks(~[3,7],EMPTY_CTXT,&mut t),3);
+        assert_eq!(unfold_marks(vec!(3,7),EMPTY_CTXT,&mut t),3);
         {
             let table = t.table.borrow();
-            assert!(table.get()[2] == Mark(7,0));
-            assert!(table.get()[3] == Mark(3,2));
+            assert!(*table.get().get(2) == Mark(7,0));
+            assert!(*table.get().get(3) == Mark(3,2));
         }
     }
 
@@ -1054,32 +1057,32 @@ mod test {
         let stopname = 242;
         let name1 = 243;
         let mut t = new_sctable_internal();
-        assert_eq!(marksof (EMPTY_CTXT,stopname,&t),~[]);
+        assert_eq!(marksof (EMPTY_CTXT,stopname,&t),Vec::new());
         // FIXME #5074: ANF'd to dodge nested calls
-        { let ans = unfold_marks(~[4,98],EMPTY_CTXT,&mut t);
-         assert_eq! (marksof (ans,stopname,&t),~[4,98]);}
+        { let ans = unfold_marks(vec!(4,98),EMPTY_CTXT,&mut t);
+         assert_eq! (marksof (ans,stopname,&t),vec!(4,98));}
         // does xoring work?
-        { let ans = unfold_marks(~[5,5,16],EMPTY_CTXT,&mut t);
-         assert_eq! (marksof (ans,stopname,&t), ~[16]);}
+        { let ans = unfold_marks(vec!(5,5,16),EMPTY_CTXT,&mut t);
+         assert_eq! (marksof (ans,stopname,&t), vec!(16));}
         // does nested xoring work?
-        { let ans = unfold_marks(~[5,10,10,5,16],EMPTY_CTXT,&mut t);
-         assert_eq! (marksof (ans, stopname,&t), ~[16]);}
+        { let ans = unfold_marks(vec!(5,10,10,5,16),EMPTY_CTXT,&mut t);
+         assert_eq! (marksof (ans, stopname,&t), vec!(16));}
         // rename where stop doesn't match:
-        { let chain = ~[M(9),
+        { let chain = vec!(M(9),
                         R(id(name1,
                              new_mark_internal (4, EMPTY_CTXT,&mut t)),
                           100101102),
-                        M(14)];
+                        M(14));
          let ans = unfold_test_sc(chain,EMPTY_CTXT,&mut t);
-         assert_eq! (marksof (ans, stopname, &t), ~[9,14]);}
+         assert_eq! (marksof (ans, stopname, &t), vec!(9,14));}
         // rename where stop does match
         { let name1sc = new_mark_internal(4, EMPTY_CTXT, &mut t);
-         let chain = ~[M(9),
+         let chain = vec!(M(9),
                        R(id(name1, name1sc),
                          stopname),
-                       M(14)];
+                       M(14));
          let ans = unfold_test_sc(chain,EMPTY_CTXT,&mut t);
-         assert_eq! (marksof (ans, stopname, &t), ~[9]); }
+         assert_eq! (marksof (ans, stopname, &t), vec!(9)); }
     }
 
 
@@ -1090,32 +1093,32 @@ mod test {
         // - ctxt is MT
         assert_eq!(resolve_internal(id(a,EMPTY_CTXT),&mut t, &mut rt),a);
         // - simple ignored marks
-        { let sc = unfold_marks(~[1,2,3],EMPTY_CTXT,&mut t);
+        { let sc = unfold_marks(vec!(1,2,3),EMPTY_CTXT,&mut t);
          assert_eq!(resolve_internal(id(a,sc),&mut t, &mut rt),a);}
         // - orthogonal rename where names don't match
-        { let sc = unfold_test_sc(~[R(id(50,EMPTY_CTXT),51),M(12)],EMPTY_CTXT,&mut t);
+        { let sc = unfold_test_sc(vec!(R(id(50,EMPTY_CTXT),51),M(12)),EMPTY_CTXT,&mut t);
          assert_eq!(resolve_internal(id(a,sc),&mut t, &mut rt),a);}
         // - rename where names do match, but marks don't
         { let sc1 = new_mark_internal(1,EMPTY_CTXT,&mut t);
-         let sc = unfold_test_sc(~[R(id(a,sc1),50),
+         let sc = unfold_test_sc(vec!(R(id(a,sc1),50),
                                    M(1),
-                                   M(2)],
+                                   M(2)),
                                  EMPTY_CTXT,&mut t);
         assert_eq!(resolve_internal(id(a,sc),&mut t, &mut rt), a);}
         // - rename where names and marks match
-        { let sc1 = unfold_test_sc(~[M(1),M(2)],EMPTY_CTXT,&mut t);
-         let sc = unfold_test_sc(~[R(id(a,sc1),50),M(1),M(2)],EMPTY_CTXT,&mut t);
+        { let sc1 = unfold_test_sc(vec!(M(1),M(2)),EMPTY_CTXT,&mut t);
+         let sc = unfold_test_sc(vec!(R(id(a,sc1),50),M(1),M(2)),EMPTY_CTXT,&mut t);
          assert_eq!(resolve_internal(id(a,sc),&mut t, &mut rt), 50); }
         // - rename where names and marks match by literal sharing
-        { let sc1 = unfold_test_sc(~[M(1),M(2)],EMPTY_CTXT,&mut t);
-         let sc = unfold_test_sc(~[R(id(a,sc1),50)],sc1,&mut t);
+        { let sc1 = unfold_test_sc(vec!(M(1),M(2)),EMPTY_CTXT,&mut t);
+         let sc = unfold_test_sc(vec!(R(id(a,sc1),50)),sc1,&mut t);
          assert_eq!(resolve_internal(id(a,sc),&mut t, &mut rt), 50); }
         // - two renames of the same var.. can only happen if you use
         // local-expand to prevent the inner binding from being renamed
         // during the rename-pass caused by the first:
         println!("about to run bad test");
-        { let sc = unfold_test_sc(~[R(id(a,EMPTY_CTXT),50),
-                                    R(id(a,EMPTY_CTXT),51)],
+        { let sc = unfold_test_sc(vec!(R(id(a,EMPTY_CTXT),50),
+                                    R(id(a,EMPTY_CTXT),51)),
                                   EMPTY_CTXT,&mut t);
          assert_eq!(resolve_internal(id(a,sc),&mut t, &mut rt), 51); }
         // the simplest double-rename:
@@ -1126,8 +1129,8 @@ mod test {
          let sc = new_mark_internal(9,a50_to_a51,&mut t);
          assert_eq!(resolve_internal(id(a,sc),&mut t, &mut rt),51);
          // but mark on the inside does:
-         let a50_to_a51_b = unfold_test_sc(~[R(id(a,a_to_a50),51),
-                                              M(9)],
+         let a50_to_a51_b = unfold_test_sc(vec!(R(id(a,a_to_a50),51),
+                                              M(9)),
                                            a_to_a50,
                                            &mut t);
          assert_eq!(resolve_internal(id(a,a50_to_a51_b),&mut t, &mut rt),50);}
diff --git a/src/libsyntax/attr.rs b/src/libsyntax/attr.rs
index 6a3ca911d7657..ed56ef15a1c8b 100644
--- a/src/libsyntax/attr.rs
+++ b/src/libsyntax/attr.rs
@@ -21,6 +21,7 @@ use parse::token;
 use crateid::CrateId;
 
 use collections::HashSet;
+use std::vec_ng::Vec;
 
 pub trait AttrMetaMethods {
     // This could be changed to `fn check_name(&self, name: InternedString) ->
@@ -146,7 +147,7 @@ pub fn mk_name_value_item(name: InternedString, value: ast::Lit)
     @dummy_spanned(MetaNameValue(name, value))
 }
 
-pub fn mk_list_item(name: InternedString, items: ~[@MetaItem]) -> @MetaItem {
+pub fn mk_list_item(name: InternedString, items: Vec<@MetaItem> ) -> @MetaItem {
     @dummy_spanned(MetaList(name, items))
 }
 
@@ -212,12 +213,12 @@ pub fn last_meta_item_value_str_by_name(items: &[@MetaItem], name: &str)
 
 /* Higher-level applications */
 
-pub fn sort_meta_items(items: &[@MetaItem]) -> ~[@MetaItem] {
+pub fn sort_meta_items(items: &[@MetaItem]) -> Vec<@MetaItem> {
     // This is sort of stupid here, but we need to sort by
     // human-readable strings.
     let mut v = items.iter()
         .map(|&mi| (mi.name(), mi))
-        .collect::<~[(InternedString, @MetaItem)]>();
+        .collect::<Vec<(InternedString, @MetaItem)> >();
 
     v.sort_by(|&(ref a, _), &(ref b, _)| a.cmp(b));
 
@@ -226,7 +227,8 @@ pub fn sort_meta_items(items: &[@MetaItem]) -> ~[@MetaItem] {
         match m.node {
             MetaList(ref n, ref mis) => {
                 @Spanned {
-                    node: MetaList((*n).clone(), sort_meta_items(*mis)),
+                    node: MetaList((*n).clone(),
+                                   sort_meta_items(mis.as_slice())),
                     .. /*bad*/ (*m).clone()
                 }
             }
@@ -239,11 +241,11 @@ pub fn sort_meta_items(items: &[@MetaItem]) -> ~[@MetaItem] {
  * From a list of crate attributes get only the meta_items that affect crate
  * linkage
  */
-pub fn find_linkage_metas(attrs: &[Attribute]) -> ~[@MetaItem] {
-    let mut result = ~[];
+pub fn find_linkage_metas(attrs: &[Attribute]) -> Vec<@MetaItem> {
+    let mut result = Vec::new();
     for attr in attrs.iter().filter(|at| at.name().equiv(&("link"))) {
         match attr.meta().node {
-            MetaList(_, ref items) => result.push_all(*items),
+            MetaList(_, ref items) => result.push_all(items.as_slice()),
             _ => ()
         }
     }
@@ -272,9 +274,9 @@ pub fn find_inline_attr(attrs: &[Attribute]) -> InlineAttr {
         match attr.node.value.node {
           MetaWord(ref n) if n.equiv(&("inline")) => InlineHint,
           MetaList(ref n, ref items) if n.equiv(&("inline")) => {
-            if contains_name(*items, "always") {
+            if contains_name(items.as_slice(), "always") {
                 InlineAlways
-            } else if contains_name(*items, "never") {
+            } else if contains_name(items.as_slice(), "never") {
                 InlineNever
             } else {
                 InlineHint
diff --git a/src/libsyntax/codemap.rs b/src/libsyntax/codemap.rs
index d114d8971f747..6f17505c90227 100644
--- a/src/libsyntax/codemap.rs
+++ b/src/libsyntax/codemap.rs
@@ -23,6 +23,7 @@ source code snippets, etc.
 
 use std::cell::RefCell;
 use std::cmp;
+use std::vec_ng::Vec;
 use serialize::{Encodable, Decodable, Encoder, Decoder};
 
 pub trait Pos {
@@ -188,8 +189,7 @@ pub type FileName = ~str;
 pub struct FileLines
 {
     file: @FileMap,
-    lines: ~[uint]
-}
+    lines: Vec<uint> }
 
 /// Identifies an offset of a multi-byte character in a FileMap
 pub struct MultiByteChar {
@@ -210,9 +210,9 @@ pub struct FileMap {
     /// The start position of this source in the CodeMap
     start_pos: BytePos,
     /// Locations of lines beginnings in the source code
-    lines: RefCell<~[BytePos]>,
+    lines: RefCell<Vec<BytePos> >,
     /// Locations of multi-byte characters in the source code
-    multibyte_chars: RefCell<~[MultiByteChar]>,
+    multibyte_chars: RefCell<Vec<MultiByteChar> >,
 }
 
 impl FileMap {
@@ -225,14 +225,14 @@ impl FileMap {
         // the new charpos must be > the last one (or it's the first one).
         let mut lines = self.lines.borrow_mut();;
         let line_len = lines.get().len();
-        assert!(line_len == 0 || (lines.get()[line_len - 1] < pos))
+        assert!(line_len == 0 || (*lines.get().get(line_len - 1) < pos))
         lines.get().push(pos);
     }
 
     // get a line from the list of pre-computed line-beginnings
     pub fn get_line(&self, line: int) -> ~str {
         let mut lines = self.lines.borrow_mut();
-        let begin: BytePos = lines.get()[line] - self.start_pos;
+        let begin: BytePos = *lines.get().get(line as uint) - self.start_pos;
         let begin = begin.to_uint();
         let slice = self.src.slice_from(begin);
         match slice.find('\n') {
@@ -257,13 +257,13 @@ impl FileMap {
 }
 
 pub struct CodeMap {
-    files: RefCell<~[@FileMap]>
+    files: RefCell<Vec<@FileMap> >
 }
 
 impl CodeMap {
     pub fn new() -> CodeMap {
         CodeMap {
-            files: RefCell::new(~[]),
+            files: RefCell::new(Vec::new()),
         }
     }
 
@@ -278,8 +278,8 @@ impl CodeMap {
             name: filename,
             src: src,
             start_pos: Pos::from_uint(start_pos),
-            lines: RefCell::new(~[]),
-            multibyte_chars: RefCell::new(~[]),
+            lines: RefCell::new(Vec::new()),
+            multibyte_chars: RefCell::new(Vec::new()),
         };
 
         files.get().push(filemap);
@@ -330,7 +330,7 @@ impl CodeMap {
     pub fn span_to_lines(&self, sp: Span) -> @FileLines {
         let lo = self.lookup_char_pos(sp.lo);
         let hi = self.lookup_char_pos(sp.hi);
-        let mut lines = ~[];
+        let mut lines = Vec::new();
         for i in range(lo.line - 1u, hi.line as uint) {
             lines.push(i);
         };
@@ -374,7 +374,7 @@ impl CodeMap {
         let mut b = len;
         while b - a > 1u {
             let m = (a + b) / 2u;
-            if files[m].start_pos > pos {
+            if files.get(m).start_pos > pos {
                 b = m;
             } else {
                 a = m;
@@ -384,7 +384,7 @@ impl CodeMap {
         // filemap, but are not the filemaps we want (because they are length 0, they cannot
         // contain what we are looking for). So, rewind until we find a useful filemap.
         loop {
-            let lines = files[a].lines.borrow();
+            let lines = files.get(a).lines.borrow();
             let lines = lines.get();
             if lines.len() > 0 {
                 break;
@@ -406,13 +406,13 @@ impl CodeMap {
         let idx = self.lookup_filemap_idx(pos);
 
         let files = self.files.borrow();
-        let f = files.get()[idx];
+        let f = *files.get().get(idx);
         let mut a = 0u;
         let mut lines = f.lines.borrow_mut();
         let mut b = lines.get().len();
         while b - a > 1u {
             let m = (a + b) / 2u;
-            if lines.get()[m] > pos { b = m; } else { a = m; }
+            if *lines.get().get(m) > pos { b = m; } else { a = m; }
         }
         return FileMapAndLine {fm: f, line: a};
     }
@@ -422,7 +422,7 @@ impl CodeMap {
         let line = a + 1u; // Line numbers start at 1
         let chpos = self.bytepos_to_file_charpos(pos);
         let lines = f.lines.borrow();
-        let linebpos = lines.get()[a];
+        let linebpos = *lines.get().get(a);
         let linechpos = self.bytepos_to_file_charpos(linebpos);
         debug!("codemap: byte pos {:?} is on the line at byte pos {:?}",
                pos, linebpos);
@@ -441,7 +441,7 @@ impl CodeMap {
         -> FileMapAndBytePos {
         let idx = self.lookup_filemap_idx(bpos);
         let files = self.files.borrow();
-        let fm = files.get()[idx];
+        let fm = *files.get().get(idx);
         let offset = bpos - fm.start_pos;
         return FileMapAndBytePos {fm: fm, pos: offset};
     }
@@ -451,7 +451,7 @@ impl CodeMap {
         debug!("codemap: converting {:?} to char pos", bpos);
         let idx = self.lookup_filemap_idx(bpos);
         let files = self.files.borrow();
-        let map = files.get()[idx];
+        let map = files.get().get(idx);
 
         // The number of extra bytes due to multibyte chars in the FileMap
         let mut total_extra_bytes = 0;
diff --git a/src/libsyntax/crateid.rs b/src/libsyntax/crateid.rs
index b5f02fb7e6441..e5136b7081b33 100644
--- a/src/libsyntax/crateid.rs
+++ b/src/libsyntax/crateid.rs
@@ -19,6 +19,7 @@ use std::fmt;
 /// to be `0.0`.
 
 use std::from_str::FromStr;
+use std::vec_ng::Vec;
 
 #[deriving(Clone, Eq)]
 pub struct CrateId {
@@ -48,25 +49,27 @@ impl fmt::Show for CrateId {
 
 impl FromStr for CrateId {
     fn from_str(s: &str) -> Option<CrateId> {
-        let pieces: ~[&str] = s.splitn('#', 1).collect();
-        let path = pieces[0].to_owned();
+        let pieces: Vec<&str> = s.splitn('#', 1).collect();
+        let path = pieces.get(0).to_owned();
 
         if path.starts_with("/") || path.ends_with("/") ||
             path.starts_with(".") || path.is_empty() {
             return None;
         }
 
-        let path_pieces: ~[&str] = path.rsplitn('/', 1).collect();
-        let inferred_name = path_pieces[0];
+        let path_pieces: Vec<&str> = path.rsplitn('/', 1).collect();
+        let inferred_name = *path_pieces.get(0);
 
         let (name, version) = if pieces.len() == 1 {
             (inferred_name.to_owned(), None)
         } else {
-            let hash_pieces: ~[&str] = pieces[1].splitn(':', 1).collect();
+            let hash_pieces: Vec<&str> = pieces.get(1)
+                                               .splitn(':', 1)
+                                               .collect();
             let (hash_name, hash_version) = if hash_pieces.len() == 1 {
-                ("", hash_pieces[0])
+                ("", *hash_pieces.get(0))
             } else {
-                (hash_pieces[0], hash_pieces[1])
+                (*hash_pieces.get(0), *hash_pieces.get(1))
             };
 
             let name = if !hash_name.is_empty() {
@@ -89,7 +92,7 @@ impl FromStr for CrateId {
         };
 
         Some(CrateId {
-            path: path,
+            path: path.clone(),
             name: name,
             version: version,
         })
diff --git a/src/libsyntax/diagnostic.rs b/src/libsyntax/diagnostic.rs
index cb7034a375dd0..c0c64d6fd60b2 100644
--- a/src/libsyntax/diagnostic.rs
+++ b/src/libsyntax/diagnostic.rs
@@ -325,7 +325,7 @@ fn highlight_lines(err: &mut EmitterWriter,
     if lines.lines.len() == 1u {
         let lo = cm.lookup_char_pos(sp.lo);
         let mut digits = 0u;
-        let mut num = (lines.lines[0] + 1u) / 10u;
+        let mut num = (*lines.lines.get(0) + 1u) / 10u;
 
         // how many digits must be indent past?
         while num > 0u { num /= 10u; digits += 1u; }
@@ -337,7 +337,7 @@ fn highlight_lines(err: &mut EmitterWriter,
         // part of the 'filename:line ' part of the previous line.
         let skip = fm.name.len() + digits + 3u;
         for _ in range(0, skip) { s.push_char(' '); }
-        let orig = fm.get_line(lines.lines[0] as int);
+        let orig = fm.get_line(*lines.lines.get(0) as int);
         for pos in range(0u, left-skip) {
             let curChar = orig[pos] as char;
             // Whenever a tab occurs on the previous line, we insert one on
diff --git a/src/libsyntax/ext/asm.rs b/src/libsyntax/ext/asm.rs
index 1bf82573c4949..6080613460da2 100644
--- a/src/libsyntax/ext/asm.rs
+++ b/src/libsyntax/ext/asm.rs
@@ -20,6 +20,8 @@ use parse;
 use parse::token::InternedString;
 use parse::token;
 
+use std::vec_ng::Vec;
+
 enum State {
     Asm,
     Outputs,
@@ -42,12 +44,14 @@ pub fn expand_asm(cx: &mut ExtCtxt, sp: Span, tts: &[ast::TokenTree])
                -> base::MacResult {
     let mut p = parse::new_parser_from_tts(cx.parse_sess(),
                                            cx.cfg(),
-                                           tts.to_owned());
+                                           tts.iter()
+                                              .map(|x| (*x).clone())
+                                              .collect());
 
     let mut asm = InternedString::new("");
     let mut asm_str_style = None;
-    let mut outputs = ~[];
-    let mut inputs = ~[];
+    let mut outputs = Vec::new();
+    let mut inputs = Vec::new();
     let mut cons = ~"";
     let mut volatile = false;
     let mut alignstack = false;
@@ -119,7 +123,7 @@ pub fn expand_asm(cx: &mut ExtCtxt, sp: Span, tts: &[ast::TokenTree])
                 }
             }
             Clobbers => {
-                let mut clobs = ~[];
+                let mut clobs = Vec::new();
                 while p.token != token::EOF &&
                       p.token != token::COLON &&
                       p.token != token::MOD_SEP {
diff --git a/src/libsyntax/ext/base.rs b/src/libsyntax/ext/base.rs
index 0636d19163e12..e9fe21eded60c 100644
--- a/src/libsyntax/ext/base.rs
+++ b/src/libsyntax/ext/base.rs
@@ -20,6 +20,7 @@ use parse::token::{InternedString, intern, str_to_ident};
 use util::small_vector::SmallVector;
 
 use collections::HashMap;
+use std::vec_ng::Vec;
 
 // new-style macro! tt code:
 //
@@ -74,7 +75,7 @@ pub trait IdentMacroExpander {
               cx: &mut ExtCtxt,
               sp: Span,
               ident: ast::Ident,
-              token_tree: ~[ast::TokenTree])
+              token_tree: Vec<ast::TokenTree> )
               -> MacResult;
 }
 
@@ -83,14 +84,14 @@ impl IdentMacroExpander for BasicIdentMacroExpander {
               cx: &mut ExtCtxt,
               sp: Span,
               ident: ast::Ident,
-              token_tree: ~[ast::TokenTree])
+              token_tree: Vec<ast::TokenTree> )
               -> MacResult {
         (self.expander)(cx, sp, ident, token_tree)
     }
 }
 
 pub type IdentMacroExpanderFn =
-    fn(&mut ExtCtxt, Span, ast::Ident, ~[ast::TokenTree]) -> MacResult;
+    fn(&mut ExtCtxt, Span, ast::Ident, Vec<ast::TokenTree> ) -> MacResult;
 
 pub type MacroCrateRegistrationFun =
     fn(|ast::Name, SyntaxExtension|);
@@ -154,13 +155,13 @@ impl BlockInfo {
     pub fn new() -> BlockInfo {
         BlockInfo {
             macros_escape: false,
-            pending_renames: ~[],
+            pending_renames: Vec::new(),
         }
     }
 }
 
 // a list of ident->name renamings
-pub type RenameList = ~[(ast::Ident,Name)];
+pub type RenameList = Vec<(ast::Ident,Name)> ;
 
 // The base map of methods for expanding syntax extension
 // AST nodes into full ASTs
@@ -271,7 +272,7 @@ pub struct MacroCrate {
 
 pub trait CrateLoader {
     fn load_crate(&mut self, krate: &ast::ViewItem) -> MacroCrate;
-    fn get_exported_macros(&mut self, crate_num: ast::CrateNum) -> ~[~str];
+    fn get_exported_macros(&mut self, crate_num: ast::CrateNum) -> Vec<~str> ;
     fn get_registrar_symbol(&mut self, crate_num: ast::CrateNum) -> Option<~str>;
 }
 
@@ -284,7 +285,7 @@ pub struct ExtCtxt<'a> {
     backtrace: Option<@ExpnInfo>,
     loader: &'a mut CrateLoader,
 
-    mod_path: ~[ast::Ident],
+    mod_path: Vec<ast::Ident> ,
     trace_mac: bool
 }
 
@@ -296,7 +297,7 @@ impl<'a> ExtCtxt<'a> {
             cfg: cfg,
             backtrace: None,
             loader: loader,
-            mod_path: ~[],
+            mod_path: Vec::new(),
             trace_mac: false
         }
     }
@@ -329,7 +330,7 @@ impl<'a> ExtCtxt<'a> {
     pub fn backtrace(&self) -> Option<@ExpnInfo> { self.backtrace }
     pub fn mod_push(&mut self, i: ast::Ident) { self.mod_path.push(i); }
     pub fn mod_pop(&mut self) { self.mod_path.pop().unwrap(); }
-    pub fn mod_path(&self) -> ~[ast::Ident] { self.mod_path.clone() }
+    pub fn mod_path(&self) -> Vec<ast::Ident> { self.mod_path.clone() }
     pub fn bt_push(&mut self, ei: codemap::ExpnInfo) {
         match ei {
             ExpnInfo {call_site: cs, callee: ref callee} => {
@@ -458,11 +459,13 @@ pub fn get_single_str_from_tts(cx: &ExtCtxt,
 /// parsing error, emit a non-fatal error and return None.
 pub fn get_exprs_from_tts(cx: &ExtCtxt,
                           sp: Span,
-                          tts: &[ast::TokenTree]) -> Option<~[@ast::Expr]> {
+                          tts: &[ast::TokenTree]) -> Option<Vec<@ast::Expr> > {
     let mut p = parse::new_parser_from_tts(cx.parse_sess(),
                                            cx.cfg(),
-                                           tts.to_owned());
-    let mut es = ~[];
+                                           tts.iter()
+                                              .map(|x| (*x).clone())
+                                              .collect());
+    let mut es = Vec::new();
     while p.token != token::EOF {
         if es.len() != 0 && !p.eat(&token::COMMA) {
             cx.span_err(sp, "expected token: `,`");
@@ -507,12 +510,12 @@ impl Drop for MapChainFrame {
 
 // Only generic to make it easy to test
 pub struct SyntaxEnv {
-    priv chain: ~[MapChainFrame],
+    priv chain: Vec<MapChainFrame> ,
 }
 
 impl SyntaxEnv {
     pub fn new() -> SyntaxEnv {
-        let mut map = SyntaxEnv { chain: ~[] };
+        let mut map = SyntaxEnv { chain: Vec::new() };
         map.push_frame();
         map
     }
@@ -553,6 +556,7 @@ impl SyntaxEnv {
     }
 
     pub fn info<'a>(&'a mut self) -> &'a mut BlockInfo {
-        &mut self.chain[self.chain.len()-1].info
+        let last_chain_index = self.chain.len() - 1;
+        &mut self.chain.get_mut(last_chain_index).info
     }
 }
diff --git a/src/libsyntax/ext/build.rs b/src/libsyntax/ext/build.rs
index 1ddd579a2f112..34625923ea1f6 100644
--- a/src/libsyntax/ext/build.rs
+++ b/src/libsyntax/ext/build.rs
@@ -21,6 +21,8 @@ use opt_vec::OptVec;
 use parse::token::special_idents;
 use parse::token;
 
+use std::vec_ng::Vec;
+
 pub struct Field {
     ident: ast::Ident,
     ex: @ast::Expr
@@ -34,14 +36,14 @@ mod syntax {
 
 pub trait AstBuilder {
     // paths
-    fn path(&self, span: Span, strs: ~[ast::Ident]) -> ast::Path;
+    fn path(&self, span: Span, strs: Vec<ast::Ident> ) -> ast::Path;
     fn path_ident(&self, span: Span, id: ast::Ident) -> ast::Path;
-    fn path_global(&self, span: Span, strs: ~[ast::Ident]) -> ast::Path;
+    fn path_global(&self, span: Span, strs: Vec<ast::Ident> ) -> ast::Path;
     fn path_all(&self, sp: Span,
                 global: bool,
-                idents: ~[ast::Ident],
+                idents: Vec<ast::Ident> ,
                 lifetimes: OptVec<ast::Lifetime>,
-                types: ~[P<ast::Ty>])
+                types: Vec<P<ast::Ty>> )
         -> ast::Path;
 
     // types
@@ -61,8 +63,8 @@ pub trait AstBuilder {
     fn ty_infer(&self, sp: Span) -> P<ast::Ty>;
     fn ty_nil(&self) -> P<ast::Ty>;
 
-    fn ty_vars(&self, ty_params: &OptVec<ast::TyParam>) -> ~[P<ast::Ty>];
-    fn ty_vars_global(&self, ty_params: &OptVec<ast::TyParam>) -> ~[P<ast::Ty>];
+    fn ty_vars(&self, ty_params: &OptVec<ast::TyParam>) -> Vec<P<ast::Ty>> ;
+    fn ty_vars_global(&self, ty_params: &OptVec<ast::TyParam>) -> Vec<P<ast::Ty>> ;
     fn ty_field_imm(&self, span: Span, name: Ident, ty: P<ast::Ty>) -> ast::TypeField;
     fn strip_bounds(&self, bounds: &Generics) -> Generics;
 
@@ -87,11 +89,11 @@ pub trait AstBuilder {
                       -> @ast::Stmt;
 
     // blocks
-    fn block(&self, span: Span, stmts: ~[@ast::Stmt], expr: Option<@ast::Expr>) -> P<ast::Block>;
+    fn block(&self, span: Span, stmts: Vec<@ast::Stmt> , expr: Option<@ast::Expr>) -> P<ast::Block>;
     fn block_expr(&self, expr: @ast::Expr) -> P<ast::Block>;
     fn block_all(&self, span: Span,
-                 view_items: ~[ast::ViewItem],
-                 stmts: ~[@ast::Stmt],
+                 view_items: Vec<ast::ViewItem> ,
+                 stmts: Vec<@ast::Stmt> ,
                  expr: Option<@ast::Expr>) -> P<ast::Block>;
 
     // expressions
@@ -109,19 +111,19 @@ pub trait AstBuilder {
     fn expr_addr_of(&self, sp: Span, e: @ast::Expr) -> @ast::Expr;
     fn expr_mut_addr_of(&self, sp: Span, e: @ast::Expr) -> @ast::Expr;
     fn expr_field_access(&self, span: Span, expr: @ast::Expr, ident: ast::Ident) -> @ast::Expr;
-    fn expr_call(&self, span: Span, expr: @ast::Expr, args: ~[@ast::Expr]) -> @ast::Expr;
-    fn expr_call_ident(&self, span: Span, id: ast::Ident, args: ~[@ast::Expr]) -> @ast::Expr;
-    fn expr_call_global(&self, sp: Span, fn_path: ~[ast::Ident],
-                        args: ~[@ast::Expr]) -> @ast::Expr;
+    fn expr_call(&self, span: Span, expr: @ast::Expr, args: Vec<@ast::Expr> ) -> @ast::Expr;
+    fn expr_call_ident(&self, span: Span, id: ast::Ident, args: Vec<@ast::Expr> ) -> @ast::Expr;
+    fn expr_call_global(&self, sp: Span, fn_path: Vec<ast::Ident> ,
+                        args: Vec<@ast::Expr> ) -> @ast::Expr;
     fn expr_method_call(&self, span: Span,
                         expr: @ast::Expr, ident: ast::Ident,
-                        args: ~[@ast::Expr]) -> @ast::Expr;
+                        args: Vec<@ast::Expr> ) -> @ast::Expr;
     fn expr_block(&self, b: P<ast::Block>) -> @ast::Expr;
     fn expr_cast(&self, sp: Span, expr: @ast::Expr, ty: P<ast::Ty>) -> @ast::Expr;
 
     fn field_imm(&self, span: Span, name: Ident, e: @ast::Expr) -> ast::Field;
-    fn expr_struct(&self, span: Span, path: ast::Path, fields: ~[ast::Field]) -> @ast::Expr;
-    fn expr_struct_ident(&self, span: Span, id: ast::Ident, fields: ~[ast::Field]) -> @ast::Expr;
+    fn expr_struct(&self, span: Span, path: ast::Path, fields: Vec<ast::Field> ) -> @ast::Expr;
+    fn expr_struct_ident(&self, span: Span, id: ast::Ident, fields: Vec<ast::Field> ) -> @ast::Expr;
 
     fn expr_lit(&self, sp: Span, lit: ast::Lit_) -> @ast::Expr;
 
@@ -131,9 +133,9 @@ pub trait AstBuilder {
     fn expr_bool(&self, sp: Span, value: bool) -> @ast::Expr;
 
     fn expr_vstore(&self, sp: Span, expr: @ast::Expr, vst: ast::ExprVstore) -> @ast::Expr;
-    fn expr_vec(&self, sp: Span, exprs: ~[@ast::Expr]) -> @ast::Expr;
-    fn expr_vec_uniq(&self, sp: Span, exprs: ~[@ast::Expr]) -> @ast::Expr;
-    fn expr_vec_slice(&self, sp: Span, exprs: ~[@ast::Expr]) -> @ast::Expr;
+    fn expr_vec(&self, sp: Span, exprs: Vec<@ast::Expr> ) -> @ast::Expr;
+    fn expr_vec_ng(&self, sp: Span) -> @ast::Expr;
+    fn expr_vec_slice(&self, sp: Span, exprs: Vec<@ast::Expr> ) -> @ast::Expr;
     fn expr_str(&self, sp: Span, s: InternedString) -> @ast::Expr;
     fn expr_str_uniq(&self, sp: Span, s: InternedString) -> @ast::Expr;
 
@@ -152,55 +154,55 @@ pub trait AstBuilder {
                               span: Span,
                               ident: ast::Ident,
                               bm: ast::BindingMode) -> @ast::Pat;
-    fn pat_enum(&self, span: Span, path: ast::Path, subpats: ~[@ast::Pat]) -> @ast::Pat;
+    fn pat_enum(&self, span: Span, path: ast::Path, subpats: Vec<@ast::Pat> ) -> @ast::Pat;
     fn pat_struct(&self, span: Span,
-                  path: ast::Path, field_pats: ~[ast::FieldPat]) -> @ast::Pat;
+                  path: ast::Path, field_pats: Vec<ast::FieldPat> ) -> @ast::Pat;
 
-    fn arm(&self, span: Span, pats: ~[@ast::Pat], expr: @ast::Expr) -> ast::Arm;
+    fn arm(&self, span: Span, pats: Vec<@ast::Pat> , expr: @ast::Expr) -> ast::Arm;
     fn arm_unreachable(&self, span: Span) -> ast::Arm;
 
-    fn expr_match(&self, span: Span, arg: @ast::Expr, arms: ~[ast::Arm]) -> @ast::Expr;
+    fn expr_match(&self, span: Span, arg: @ast::Expr, arms: Vec<ast::Arm> ) -> @ast::Expr;
     fn expr_if(&self, span: Span,
                cond: @ast::Expr, then: @ast::Expr, els: Option<@ast::Expr>) -> @ast::Expr;
 
     fn lambda_fn_decl(&self, span: Span,
                       fn_decl: P<ast::FnDecl>, blk: P<ast::Block>) -> @ast::Expr;
 
-    fn lambda(&self, span: Span, ids: ~[ast::Ident], blk: P<ast::Block>) -> @ast::Expr;
+    fn lambda(&self, span: Span, ids: Vec<ast::Ident> , blk: P<ast::Block>) -> @ast::Expr;
     fn lambda0(&self, span: Span, blk: P<ast::Block>) -> @ast::Expr;
     fn lambda1(&self, span: Span, blk: P<ast::Block>, ident: ast::Ident) -> @ast::Expr;
 
-    fn lambda_expr(&self, span: Span, ids: ~[ast::Ident], blk: @ast::Expr) -> @ast::Expr;
+    fn lambda_expr(&self, span: Span, ids: Vec<ast::Ident> , blk: @ast::Expr) -> @ast::Expr;
     fn lambda_expr_0(&self, span: Span, expr: @ast::Expr) -> @ast::Expr;
     fn lambda_expr_1(&self, span: Span, expr: @ast::Expr, ident: ast::Ident) -> @ast::Expr;
 
-    fn lambda_stmts(&self, span: Span, ids: ~[ast::Ident], blk: ~[@ast::Stmt]) -> @ast::Expr;
-    fn lambda_stmts_0(&self, span: Span, stmts: ~[@ast::Stmt]) -> @ast::Expr;
-    fn lambda_stmts_1(&self, span: Span, stmts: ~[@ast::Stmt], ident: ast::Ident) -> @ast::Expr;
+    fn lambda_stmts(&self, span: Span, ids: Vec<ast::Ident> , blk: Vec<@ast::Stmt> ) -> @ast::Expr;
+    fn lambda_stmts_0(&self, span: Span, stmts: Vec<@ast::Stmt> ) -> @ast::Expr;
+    fn lambda_stmts_1(&self, span: Span, stmts: Vec<@ast::Stmt> , ident: ast::Ident) -> @ast::Expr;
 
     // items
     fn item(&self, span: Span,
-            name: Ident, attrs: ~[ast::Attribute], node: ast::Item_) -> @ast::Item;
+            name: Ident, attrs: Vec<ast::Attribute> , node: ast::Item_) -> @ast::Item;
 
     fn arg(&self, span: Span, name: Ident, ty: P<ast::Ty>) -> ast::Arg;
     // FIXME unused self
-    fn fn_decl(&self, inputs: ~[ast::Arg], output: P<ast::Ty>) -> P<ast::FnDecl>;
+    fn fn_decl(&self, inputs: Vec<ast::Arg> , output: P<ast::Ty>) -> P<ast::FnDecl>;
 
     fn item_fn_poly(&self,
                     span: Span,
                     name: Ident,
-                    inputs: ~[ast::Arg],
+                    inputs: Vec<ast::Arg> ,
                     output: P<ast::Ty>,
                     generics: Generics,
                     body: P<ast::Block>) -> @ast::Item;
     fn item_fn(&self,
                span: Span,
                name: Ident,
-               inputs: ~[ast::Arg],
+               inputs: Vec<ast::Arg> ,
                output: P<ast::Ty>,
                body: P<ast::Block>) -> @ast::Item;
 
-    fn variant(&self, span: Span, name: Ident, tys: ~[P<ast::Ty>]) -> ast::Variant;
+    fn variant(&self, span: Span, name: Ident, tys: Vec<P<ast::Ty>> ) -> ast::Variant;
     fn item_enum_poly(&self,
                       span: Span,
                       name: Ident,
@@ -216,8 +218,8 @@ pub trait AstBuilder {
     fn item_struct(&self, span: Span, name: Ident, struct_def: ast::StructDef) -> @ast::Item;
 
     fn item_mod(&self, span: Span,
-                name: Ident, attrs: ~[ast::Attribute],
-                vi: ~[ast::ViewItem], items: ~[@ast::Item]) -> @ast::Item;
+                name: Ident, attrs: Vec<ast::Attribute> ,
+                vi: Vec<ast::ViewItem> , items: Vec<@ast::Item> ) -> @ast::Item;
 
     fn item_ty_poly(&self,
                     span: Span,
@@ -232,7 +234,7 @@ pub trait AstBuilder {
     fn meta_list(&self,
                  sp: Span,
                  name: InternedString,
-                 mis: ~[@ast::MetaItem])
+                 mis: Vec<@ast::MetaItem> )
                  -> @ast::MetaItem;
     fn meta_name_value(&self,
                        sp: Span,
@@ -241,35 +243,35 @@ pub trait AstBuilder {
                        -> @ast::MetaItem;
 
     fn view_use(&self, sp: Span,
-                vis: ast::Visibility, vp: ~[@ast::ViewPath]) -> ast::ViewItem;
+                vis: ast::Visibility, vp: Vec<@ast::ViewPath> ) -> ast::ViewItem;
     fn view_use_simple(&self, sp: Span, vis: ast::Visibility, path: ast::Path) -> ast::ViewItem;
     fn view_use_simple_(&self, sp: Span, vis: ast::Visibility,
                         ident: ast::Ident, path: ast::Path) -> ast::ViewItem;
     fn view_use_list(&self, sp: Span, vis: ast::Visibility,
-                     path: ~[ast::Ident], imports: &[ast::Ident]) -> ast::ViewItem;
+                     path: Vec<ast::Ident> , imports: &[ast::Ident]) -> ast::ViewItem;
     fn view_use_glob(&self, sp: Span,
-                     vis: ast::Visibility, path: ~[ast::Ident]) -> ast::ViewItem;
+                     vis: ast::Visibility, path: Vec<ast::Ident> ) -> ast::ViewItem;
 }
 
 impl<'a> AstBuilder for ExtCtxt<'a> {
-    fn path(&self, span: Span, strs: ~[ast::Ident]) -> ast::Path {
-        self.path_all(span, false, strs, opt_vec::Empty, ~[])
+    fn path(&self, span: Span, strs: Vec<ast::Ident> ) -> ast::Path {
+        self.path_all(span, false, strs, opt_vec::Empty, Vec::new())
     }
     fn path_ident(&self, span: Span, id: ast::Ident) -> ast::Path {
-        self.path(span, ~[id])
+        self.path(span, vec!(id))
     }
-    fn path_global(&self, span: Span, strs: ~[ast::Ident]) -> ast::Path {
-        self.path_all(span, true, strs, opt_vec::Empty, ~[])
+    fn path_global(&self, span: Span, strs: Vec<ast::Ident> ) -> ast::Path {
+        self.path_all(span, true, strs, opt_vec::Empty, Vec::new())
     }
     fn path_all(&self,
                 sp: Span,
                 global: bool,
-                mut idents: ~[ast::Ident],
+                mut idents: Vec<ast::Ident> ,
                 lifetimes: OptVec<ast::Lifetime>,
-                types: ~[P<ast::Ty>])
+                types: Vec<P<ast::Ty>> )
                 -> ast::Path {
         let last_identifier = idents.pop().unwrap();
-        let mut segments: ~[ast::PathSegment] = idents.move_iter()
+        let mut segments: Vec<ast::PathSegment> = idents.move_iter()
                                                       .map(|ident| {
             ast::PathSegment {
                 identifier: ident,
@@ -335,13 +337,13 @@ impl<'a> AstBuilder for ExtCtxt<'a> {
         self.ty_path(
             self.path_all(DUMMY_SP,
                           true,
-                          ~[
+                          vec!(
                               self.ident_of("std"),
                               self.ident_of("option"),
                               self.ident_of("Option")
-                          ],
+                          ),
                           opt_vec::Empty,
-                          ~[ ty ]), None)
+                          vec!( ty )), None)
     }
 
     fn ty_field_imm(&self, span: Span, name: Ident, ty: P<ast::Ty>) -> ast::TypeField {
@@ -379,15 +381,15 @@ impl<'a> AstBuilder for ExtCtxt<'a> {
     // these are strange, and probably shouldn't be used outside of
     // pipes. Specifically, the global version possible generates
     // incorrect code.
-    fn ty_vars(&self, ty_params: &OptVec<ast::TyParam>) -> ~[P<ast::Ty>] {
+    fn ty_vars(&self, ty_params: &OptVec<ast::TyParam>) -> Vec<P<ast::Ty>> {
         opt_vec::take_vec(
             ty_params.map(|p| self.ty_ident(DUMMY_SP, p.ident)))
     }
 
-    fn ty_vars_global(&self, ty_params: &OptVec<ast::TyParam>) -> ~[P<ast::Ty>] {
+    fn ty_vars_global(&self, ty_params: &OptVec<ast::TyParam>) -> Vec<P<ast::Ty>> {
         opt_vec::take_vec(
             ty_params.map(|p| self.ty_path(
-                self.path_global(DUMMY_SP, ~[p.ident]), None)))
+                self.path_global(DUMMY_SP, vec!(p.ident)), None)))
     }
 
     fn strip_bounds(&self, generics: &Generics) -> Generics {
@@ -459,17 +461,17 @@ impl<'a> AstBuilder for ExtCtxt<'a> {
         @respan(sp, ast::StmtDecl(@decl, ast::DUMMY_NODE_ID))
     }
 
-    fn block(&self, span: Span, stmts: ~[@ast::Stmt], expr: Option<@Expr>) -> P<ast::Block> {
-        self.block_all(span, ~[], stmts, expr)
+    fn block(&self, span: Span, stmts: Vec<@ast::Stmt> , expr: Option<@Expr>) -> P<ast::Block> {
+        self.block_all(span, Vec::new(), stmts, expr)
     }
 
     fn block_expr(&self, expr: @ast::Expr) -> P<ast::Block> {
-        self.block_all(expr.span, ~[], ~[], Some(expr))
+        self.block_all(expr.span, Vec::new(), Vec::new(), Some(expr))
     }
     fn block_all(&self,
                  span: Span,
-                 view_items: ~[ast::ViewItem],
-                 stmts: ~[@ast::Stmt],
+                 view_items: Vec<ast::ViewItem> ,
+                 stmts: Vec<@ast::Stmt> ,
                  expr: Option<@ast::Expr>) -> P<ast::Block> {
             P(ast::Block {
                view_items: view_items,
@@ -517,7 +519,7 @@ impl<'a> AstBuilder for ExtCtxt<'a> {
     }
 
     fn expr_field_access(&self, sp: Span, expr: @ast::Expr, ident: ast::Ident) -> @ast::Expr {
-        self.expr(sp, ast::ExprField(expr, ident, ~[]))
+        self.expr(sp, ast::ExprField(expr, ident, Vec::new()))
     }
     fn expr_addr_of(&self, sp: Span, e: @ast::Expr) -> @ast::Expr {
         self.expr(sp, ast::ExprAddrOf(ast::MutImmutable, e))
@@ -526,23 +528,23 @@ impl<'a> AstBuilder for ExtCtxt<'a> {
         self.expr(sp, ast::ExprAddrOf(ast::MutMutable, e))
     }
 
-    fn expr_call(&self, span: Span, expr: @ast::Expr, args: ~[@ast::Expr]) -> @ast::Expr {
+    fn expr_call(&self, span: Span, expr: @ast::Expr, args: Vec<@ast::Expr> ) -> @ast::Expr {
         self.expr(span, ast::ExprCall(expr, args))
     }
-    fn expr_call_ident(&self, span: Span, id: ast::Ident, args: ~[@ast::Expr]) -> @ast::Expr {
+    fn expr_call_ident(&self, span: Span, id: ast::Ident, args: Vec<@ast::Expr> ) -> @ast::Expr {
         self.expr(span, ast::ExprCall(self.expr_ident(span, id), args))
     }
-    fn expr_call_global(&self, sp: Span, fn_path: ~[ast::Ident],
-                      args: ~[@ast::Expr]) -> @ast::Expr {
+    fn expr_call_global(&self, sp: Span, fn_path: Vec<ast::Ident> ,
+                      args: Vec<@ast::Expr> ) -> @ast::Expr {
         let pathexpr = self.expr_path(self.path_global(sp, fn_path));
         self.expr_call(sp, pathexpr, args)
     }
     fn expr_method_call(&self, span: Span,
                         expr: @ast::Expr,
                         ident: ast::Ident,
-                        mut args: ~[@ast::Expr]) -> @ast::Expr {
+                        mut args: Vec<@ast::Expr> ) -> @ast::Expr {
         args.unshift(expr);
-        self.expr(span, ast::ExprMethodCall(ident, ~[], args))
+        self.expr(span, ast::ExprMethodCall(ident, Vec::new(), args))
     }
     fn expr_block(&self, b: P<ast::Block>) -> @ast::Expr {
         self.expr(b.span, ast::ExprBlock(b))
@@ -550,11 +552,11 @@ impl<'a> AstBuilder for ExtCtxt<'a> {
     fn field_imm(&self, span: Span, name: Ident, e: @ast::Expr) -> ast::Field {
         ast::Field { ident: respan(span, name), expr: e, span: span }
     }
-    fn expr_struct(&self, span: Span, path: ast::Path, fields: ~[ast::Field]) -> @ast::Expr {
+    fn expr_struct(&self, span: Span, path: ast::Path, fields: Vec<ast::Field> ) -> @ast::Expr {
         self.expr(span, ast::ExprStruct(path, fields, None))
     }
     fn expr_struct_ident(&self, span: Span,
-                         id: ast::Ident, fields: ~[ast::Field]) -> @ast::Expr {
+                         id: ast::Ident, fields: Vec<ast::Field> ) -> @ast::Expr {
         self.expr_struct(span, self.path_ident(span, id), fields)
     }
 
@@ -577,13 +579,18 @@ impl<'a> AstBuilder for ExtCtxt<'a> {
     fn expr_vstore(&self, sp: Span, expr: @ast::Expr, vst: ast::ExprVstore) -> @ast::Expr {
         self.expr(sp, ast::ExprVstore(expr, vst))
     }
-    fn expr_vec(&self, sp: Span, exprs: ~[@ast::Expr]) -> @ast::Expr {
+    fn expr_vec(&self, sp: Span, exprs: Vec<@ast::Expr> ) -> @ast::Expr {
         self.expr(sp, ast::ExprVec(exprs, ast::MutImmutable))
     }
-    fn expr_vec_uniq(&self, sp: Span, exprs: ~[@ast::Expr]) -> @ast::Expr {
-        self.expr_vstore(sp, self.expr_vec(sp, exprs), ast::ExprVstoreUniq)
+    fn expr_vec_ng(&self, sp: Span) -> @ast::Expr {
+        self.expr_call_global(sp,
+                              vec!(self.ident_of("std"),
+                                   self.ident_of("vec_ng"),
+                                   self.ident_of("Vec"),
+                                   self.ident_of("new")),
+                              Vec::new())
     }
-    fn expr_vec_slice(&self, sp: Span, exprs: ~[@ast::Expr]) -> @ast::Expr {
+    fn expr_vec_slice(&self, sp: Span, exprs: Vec<@ast::Expr> ) -> @ast::Expr {
         self.expr_vstore(sp, self.expr_vec(sp, exprs), ast::ExprVstoreSlice)
     }
     fn expr_str(&self, sp: Span, s: InternedString) -> @ast::Expr {
@@ -600,20 +607,18 @@ impl<'a> AstBuilder for ExtCtxt<'a> {
 
 
     fn expr_some(&self, sp: Span, expr: @ast::Expr) -> @ast::Expr {
-        let some = ~[
+        let some = vec!(
             self.ident_of("std"),
             self.ident_of("option"),
-            self.ident_of("Some"),
-        ];
-        self.expr_call_global(sp, some, ~[expr])
+            self.ident_of("Some"));
+        self.expr_call_global(sp, some, vec!(expr))
     }
 
     fn expr_none(&self, sp: Span) -> @ast::Expr {
-        let none = self.path_global(sp, ~[
+        let none = self.path_global(sp, vec!(
             self.ident_of("std"),
             self.ident_of("option"),
-            self.ident_of("None"),
-        ]);
+            self.ident_of("None")));
         self.expr_path(none)
     }
 
@@ -621,17 +626,15 @@ impl<'a> AstBuilder for ExtCtxt<'a> {
         let loc = self.codemap().lookup_char_pos(span.lo);
         self.expr_call_global(
             span,
-            ~[
+            vec!(
                 self.ident_of("std"),
                 self.ident_of("rt"),
-                self.ident_of("begin_unwind"),
-            ],
-            ~[
+                self.ident_of("begin_unwind")),
+            vec!(
                 self.expr_str(span, msg),
                 self.expr_str(span,
                               token::intern_and_get_ident(loc.file.name)),
-                self.expr_uint(span, loc.line),
-            ])
+                self.expr_uint(span, loc.line)))
     }
 
     fn expr_unreachable(&self, span: Span) -> @ast::Expr {
@@ -662,17 +665,17 @@ impl<'a> AstBuilder for ExtCtxt<'a> {
         let pat = ast::PatIdent(bm, path, None);
         self.pat(span, pat)
     }
-    fn pat_enum(&self, span: Span, path: ast::Path, subpats: ~[@ast::Pat]) -> @ast::Pat {
+    fn pat_enum(&self, span: Span, path: ast::Path, subpats: Vec<@ast::Pat> ) -> @ast::Pat {
         let pat = ast::PatEnum(path, Some(subpats));
         self.pat(span, pat)
     }
     fn pat_struct(&self, span: Span,
-                  path: ast::Path, field_pats: ~[ast::FieldPat]) -> @ast::Pat {
+                  path: ast::Path, field_pats: Vec<ast::FieldPat> ) -> @ast::Pat {
         let pat = ast::PatStruct(path, field_pats, false);
         self.pat(span, pat)
     }
 
-    fn arm(&self, _span: Span, pats: ~[@ast::Pat], expr: @ast::Expr) -> ast::Arm {
+    fn arm(&self, _span: Span, pats: Vec<@ast::Pat> , expr: @ast::Expr) -> ast::Arm {
         ast::Arm {
             pats: pats,
             guard: None,
@@ -681,10 +684,10 @@ impl<'a> AstBuilder for ExtCtxt<'a> {
     }
 
     fn arm_unreachable(&self, span: Span) -> ast::Arm {
-        self.arm(span, ~[self.pat_wild(span)], self.expr_unreachable(span))
+        self.arm(span, vec!(self.pat_wild(span)), self.expr_unreachable(span))
     }
 
-    fn expr_match(&self, span: Span, arg: @ast::Expr, arms: ~[ast::Arm]) -> @Expr {
+    fn expr_match(&self, span: Span, arg: @ast::Expr, arms: Vec<ast::Arm> ) -> @Expr {
         self.expr(span, ast::ExprMatch(arg, arms))
     }
 
@@ -698,24 +701,22 @@ impl<'a> AstBuilder for ExtCtxt<'a> {
                       fn_decl: P<ast::FnDecl>, blk: P<ast::Block>) -> @ast::Expr {
         self.expr(span, ast::ExprFnBlock(fn_decl, blk))
     }
-    fn lambda(&self, span: Span, ids: ~[ast::Ident], blk: P<ast::Block>) -> @ast::Expr {
+    fn lambda(&self, span: Span, ids: Vec<ast::Ident> , blk: P<ast::Block>) -> @ast::Expr {
         let fn_decl = self.fn_decl(
             ids.map(|id| self.arg(span, *id, self.ty_infer(span))),
             self.ty_infer(span));
 
         self.expr(span, ast::ExprFnBlock(fn_decl, blk))
     }
-    fn lambda0(&self, _span: Span, blk: P<ast::Block>) -> @ast::Expr {
-        let blk_e = self.expr(blk.span, ast::ExprBlock(blk));
-        quote_expr!(self, || $blk_e )
+    fn lambda0(&self, span: Span, blk: P<ast::Block>) -> @ast::Expr {
+        self.lambda(span, Vec::new(), blk)
     }
 
-    fn lambda1(&self, _span: Span, blk: P<ast::Block>, ident: ast::Ident) -> @ast::Expr {
-        let blk_e = self.expr(blk.span, ast::ExprBlock(blk));
-        quote_expr!(self, |$ident| $blk_e )
+    fn lambda1(&self, span: Span, blk: P<ast::Block>, ident: ast::Ident) -> @ast::Expr {
+        self.lambda(span, vec!(ident), blk)
     }
 
-    fn lambda_expr(&self, span: Span, ids: ~[ast::Ident], expr: @ast::Expr) -> @ast::Expr {
+    fn lambda_expr(&self, span: Span, ids: Vec<ast::Ident> , expr: @ast::Expr) -> @ast::Expr {
         self.lambda(span, ids, self.block_expr(expr))
     }
     fn lambda_expr_0(&self, span: Span, expr: @ast::Expr) -> @ast::Expr {
@@ -725,13 +726,17 @@ impl<'a> AstBuilder for ExtCtxt<'a> {
         self.lambda1(span, self.block_expr(expr), ident)
     }
 
-    fn lambda_stmts(&self, span: Span, ids: ~[ast::Ident], stmts: ~[@ast::Stmt]) -> @ast::Expr {
+    fn lambda_stmts(&self,
+                    span: Span,
+                    ids: Vec<ast::Ident>,
+                    stmts: Vec<@ast::Stmt>)
+                    -> @ast::Expr {
         self.lambda(span, ids, self.block(span, stmts, None))
     }
-    fn lambda_stmts_0(&self, span: Span, stmts: ~[@ast::Stmt]) -> @ast::Expr {
+    fn lambda_stmts_0(&self, span: Span, stmts: Vec<@ast::Stmt> ) -> @ast::Expr {
         self.lambda0(span, self.block(span, stmts, None))
     }
-    fn lambda_stmts_1(&self, span: Span, stmts: ~[@ast::Stmt], ident: ast::Ident) -> @ast::Expr {
+    fn lambda_stmts_1(&self, span: Span, stmts: Vec<@ast::Stmt> , ident: ast::Ident) -> @ast::Expr {
         self.lambda1(span, self.block(span, stmts, None), ident)
     }
 
@@ -745,7 +750,7 @@ impl<'a> AstBuilder for ExtCtxt<'a> {
     }
 
     // FIXME unused self
-    fn fn_decl(&self, inputs: ~[ast::Arg], output: P<ast::Ty>) -> P<ast::FnDecl> {
+    fn fn_decl(&self, inputs: Vec<ast::Arg> , output: P<ast::Ty>) -> P<ast::FnDecl> {
         P(ast::FnDecl {
             inputs: inputs,
             output: output,
@@ -755,7 +760,7 @@ impl<'a> AstBuilder for ExtCtxt<'a> {
     }
 
     fn item(&self, span: Span,
-            name: Ident, attrs: ~[ast::Attribute], node: ast::Item_) -> @ast::Item {
+            name: Ident, attrs: Vec<ast::Attribute> , node: ast::Item_) -> @ast::Item {
         // FIXME: Would be nice if our generated code didn't violate
         // Rust coding conventions
         @ast::Item { ident: name,
@@ -769,13 +774,13 @@ impl<'a> AstBuilder for ExtCtxt<'a> {
     fn item_fn_poly(&self,
                     span: Span,
                     name: Ident,
-                    inputs: ~[ast::Arg],
+                    inputs: Vec<ast::Arg> ,
                     output: P<ast::Ty>,
                     generics: Generics,
                     body: P<ast::Block>) -> @ast::Item {
         self.item(span,
                   name,
-                  ~[],
+                  Vec::new(),
                   ast::ItemFn(self.fn_decl(inputs, output),
                               ast::ImpureFn,
                               AbiSet::Rust(),
@@ -786,7 +791,7 @@ impl<'a> AstBuilder for ExtCtxt<'a> {
     fn item_fn(&self,
                span: Span,
                name: Ident,
-               inputs: ~[ast::Arg],
+               inputs: Vec<ast::Arg> ,
                output: P<ast::Ty>,
                body: P<ast::Block>
               ) -> @ast::Item {
@@ -799,7 +804,7 @@ impl<'a> AstBuilder for ExtCtxt<'a> {
             body)
     }
 
-    fn variant(&self, span: Span, name: Ident, tys: ~[P<ast::Ty>]) -> ast::Variant {
+    fn variant(&self, span: Span, name: Ident, tys: Vec<P<ast::Ty>> ) -> ast::Variant {
         let args = tys.move_iter().map(|ty| {
             ast::VariantArg { ty: ty, id: ast::DUMMY_NODE_ID }
         }).collect();
@@ -807,7 +812,7 @@ impl<'a> AstBuilder for ExtCtxt<'a> {
         respan(span,
                ast::Variant_ {
                    name: name,
-                   attrs: ~[],
+                   attrs: Vec::new(),
                    kind: ast::TupleVariantKind(args),
                    id: ast::DUMMY_NODE_ID,
                    disr_expr: None,
@@ -818,7 +823,7 @@ impl<'a> AstBuilder for ExtCtxt<'a> {
     fn item_enum_poly(&self, span: Span, name: Ident,
                       enum_definition: ast::EnumDef,
                       generics: Generics) -> @ast::Item {
-        self.item(span, name, ~[], ast::ItemEnum(enum_definition, generics))
+        self.item(span, name, Vec::new(), ast::ItemEnum(enum_definition, generics))
     }
 
     fn item_enum(&self, span: Span, name: Ident,
@@ -839,13 +844,13 @@ impl<'a> AstBuilder for ExtCtxt<'a> {
 
     fn item_struct_poly(&self, span: Span, name: Ident,
         struct_def: ast::StructDef, generics: Generics) -> @ast::Item {
-        self.item(span, name, ~[], ast::ItemStruct(@struct_def, generics))
+        self.item(span, name, Vec::new(), ast::ItemStruct(@struct_def, generics))
     }
 
     fn item_mod(&self, span: Span, name: Ident,
-                attrs: ~[ast::Attribute],
-                vi: ~[ast::ViewItem],
-                items: ~[@ast::Item]) -> @ast::Item {
+                attrs: Vec<ast::Attribute> ,
+                vi: Vec<ast::ViewItem> ,
+                items: Vec<@ast::Item> ) -> @ast::Item {
         self.item(
             span,
             name,
@@ -859,7 +864,7 @@ impl<'a> AstBuilder for ExtCtxt<'a> {
 
     fn item_ty_poly(&self, span: Span, name: Ident, ty: P<ast::Ty>,
                     generics: Generics) -> @ast::Item {
-        self.item(span, name, ~[], ast::ItemTy(ty, generics))
+        self.item(span, name, Vec::new(), ast::ItemTy(ty, generics))
     }
 
     fn item_ty(&self, span: Span, name: Ident, ty: P<ast::Ty>) -> @ast::Item {
@@ -880,7 +885,7 @@ impl<'a> AstBuilder for ExtCtxt<'a> {
     fn meta_list(&self,
                  sp: Span,
                  name: InternedString,
-                 mis: ~[@ast::MetaItem])
+                 mis: Vec<@ast::MetaItem> )
                  -> @ast::MetaItem {
         @respan(sp, ast::MetaList(name, mis))
     }
@@ -893,10 +898,10 @@ impl<'a> AstBuilder for ExtCtxt<'a> {
     }
 
     fn view_use(&self, sp: Span,
-                vis: ast::Visibility, vp: ~[@ast::ViewPath]) -> ast::ViewItem {
+                vis: ast::Visibility, vp: Vec<@ast::ViewPath> ) -> ast::ViewItem {
         ast::ViewItem {
             node: ast::ViewItemUse(vp),
-            attrs: ~[],
+            attrs: Vec::new(),
             vis: vis,
             span: sp
         }
@@ -910,30 +915,32 @@ impl<'a> AstBuilder for ExtCtxt<'a> {
     fn view_use_simple_(&self, sp: Span, vis: ast::Visibility,
                         ident: ast::Ident, path: ast::Path) -> ast::ViewItem {
         self.view_use(sp, vis,
-                      ~[@respan(sp,
+                      vec!(@respan(sp,
                                 ast::ViewPathSimple(ident,
                                                     path,
-                                                    ast::DUMMY_NODE_ID))])
+                                                    ast::DUMMY_NODE_ID))))
     }
 
     fn view_use_list(&self, sp: Span, vis: ast::Visibility,
-                     path: ~[ast::Ident], imports: &[ast::Ident]) -> ast::ViewItem {
+                     path: Vec<ast::Ident> , imports: &[ast::Ident]) -> ast::ViewItem {
         let imports = imports.map(|id| {
             respan(sp, ast::PathListIdent_ { name: *id, id: ast::DUMMY_NODE_ID })
         });
 
         self.view_use(sp, vis,
-                      ~[@respan(sp,
+                      vec!(@respan(sp,
                                 ast::ViewPathList(self.path(sp, path),
-                                                  imports,
-                                                  ast::DUMMY_NODE_ID))])
+                                                  imports.iter()
+                                                         .map(|x| *x)
+                                                         .collect(),
+                                                  ast::DUMMY_NODE_ID))))
     }
 
     fn view_use_glob(&self, sp: Span,
-                     vis: ast::Visibility, path: ~[ast::Ident]) -> ast::ViewItem {
+                     vis: ast::Visibility, path: Vec<ast::Ident> ) -> ast::ViewItem {
         self.view_use(sp, vis,
-                      ~[@respan(sp,
-                                ast::ViewPathGlob(self.path(sp, path), ast::DUMMY_NODE_ID))])
+                      vec!(@respan(sp,
+                                ast::ViewPathGlob(self.path(sp, path), ast::DUMMY_NODE_ID))))
     }
 }
 
diff --git a/src/libsyntax/ext/bytes.rs b/src/libsyntax/ext/bytes.rs
index 68aa757c524fb..6123fd4d3d490 100644
--- a/src/libsyntax/ext/bytes.rs
+++ b/src/libsyntax/ext/bytes.rs
@@ -17,6 +17,7 @@ use ext::base;
 use ext::build::AstBuilder;
 
 use std::char;
+use std::vec_ng::Vec;
 
 pub fn expand_syntax_ext(cx: &mut ExtCtxt, sp: Span, tts: &[ast::TokenTree]) -> base::MacResult {
     // Gather all argument expressions
@@ -24,7 +25,7 @@ pub fn expand_syntax_ext(cx: &mut ExtCtxt, sp: Span, tts: &[ast::TokenTree]) ->
         None => return MacResult::dummy_expr(sp),
         Some(e) => e,
     };
-    let mut bytes = ~[];
+    let mut bytes = Vec::new();
 
     for expr in exprs.iter() {
         match expr.node {
diff --git a/src/libsyntax/ext/cfg.rs b/src/libsyntax/ext/cfg.rs
index 295c456c9d0bc..5d11a0d1e2ff2 100644
--- a/src/libsyntax/ext/cfg.rs
+++ b/src/libsyntax/ext/cfg.rs
@@ -26,12 +26,16 @@ use parse::token::InternedString;
 use parse::token;
 use parse;
 
+use std::vec_ng::Vec;
+
 pub fn expand_cfg(cx: &mut ExtCtxt, sp: Span, tts: &[ast::TokenTree]) -> base::MacResult {
     let mut p = parse::new_parser_from_tts(cx.parse_sess(),
                                            cx.cfg(),
-                                           tts.to_owned());
+                                           tts.iter()
+                                              .map(|x| (*x).clone())
+                                              .collect());
 
-    let mut cfgs = ~[];
+    let mut cfgs = Vec::new();
     // parse `cfg!(meta_item, meta_item(x,y), meta_item="foo", ...)`
     while p.token != token::EOF {
         cfgs.push(p.parse_meta_item());
@@ -42,7 +46,8 @@ pub fn expand_cfg(cx: &mut ExtCtxt, sp: Span, tts: &[ast::TokenTree]) -> base::M
     // test_cfg searches for meta items looking like `cfg(foo, ...)`
     let in_cfg = &[cx.meta_list(sp, InternedString::new("cfg"), cfgs)];
 
-    let matches_cfg = attr::test_cfg(cx.cfg(), in_cfg.iter().map(|&x| x));
+    let matches_cfg = attr::test_cfg(cx.cfg().as_slice(),
+                                     in_cfg.iter().map(|&x| x));
     let e = cx.expr_bool(sp, matches_cfg);
     MRExpr(e)
 }
diff --git a/src/libsyntax/ext/concat_idents.rs b/src/libsyntax/ext/concat_idents.rs
index 85cfd4f61e414..2552586939811 100644
--- a/src/libsyntax/ext/concat_idents.rs
+++ b/src/libsyntax/ext/concat_idents.rs
@@ -48,13 +48,13 @@ pub fn expand_syntax_ext(cx: &mut ExtCtxt, sp: Span, tts: &[ast::TokenTree])
             ast::Path {
                  span: sp,
                  global: false,
-                 segments: ~[
+                 segments: vec!(
                     ast::PathSegment {
                         identifier: res,
                         lifetimes: opt_vec::Empty,
                         types: opt_vec::Empty,
                     }
-                ]
+                )
             }
         ),
         span: sp,
diff --git a/src/libsyntax/ext/deriving/clone.rs b/src/libsyntax/ext/deriving/clone.rs
index f52a2accd8d82..feda1694ff193 100644
--- a/src/libsyntax/ext/deriving/clone.rs
+++ b/src/libsyntax/ext/deriving/clone.rs
@@ -14,6 +14,8 @@ use ext::base::ExtCtxt;
 use ext::build::AstBuilder;
 use ext::deriving::generic::*;
 
+use std::vec_ng::Vec;
+
 pub fn expand_deriving_clone(cx: &mut ExtCtxt,
                              span: Span,
                              mitem: @MetaItem,
@@ -21,22 +23,22 @@ pub fn expand_deriving_clone(cx: &mut ExtCtxt,
                              push: |@Item|) {
     let trait_def = TraitDef {
         span: span,
-        attributes: ~[],
-        path: Path::new(~["std", "clone", "Clone"]),
-        additional_bounds: ~[],
+        attributes: Vec::new(),
+        path: Path::new(vec!("std", "clone", "Clone")),
+        additional_bounds: Vec::new(),
         generics: LifetimeBounds::empty(),
-        methods: ~[
+        methods: vec!(
             MethodDef {
                 name: "clone",
                 generics: LifetimeBounds::empty(),
                 explicit_self: borrowed_explicit_self(),
-                args: ~[],
+                args: Vec::new(),
                 ret_ty: Self,
                 inline: true,
                 const_nonmatching: false,
                 combine_substructure: |c, s, sub| cs_clone("Clone", c, s, sub)
             }
-        ]
+        )
     };
 
     trait_def.expand(cx, mitem, item, push)
@@ -49,16 +51,16 @@ pub fn expand_deriving_deep_clone(cx: &mut ExtCtxt,
                                   push: |@Item|) {
     let trait_def = TraitDef {
         span: span,
-        attributes: ~[],
-        path: Path::new(~["std", "clone", "DeepClone"]),
-        additional_bounds: ~[],
+        attributes: Vec::new(),
+        path: Path::new(vec!("std", "clone", "DeepClone")),
+        additional_bounds: Vec::new(),
         generics: LifetimeBounds::empty(),
-        methods: ~[
+        methods: vec!(
             MethodDef {
                 name: "deep_clone",
                 generics: LifetimeBounds::empty(),
                 explicit_self: borrowed_explicit_self(),
-                args: ~[],
+                args: Vec::new(),
                 ret_ty: Self,
                 inline: true,
                 const_nonmatching: false,
@@ -66,7 +68,7 @@ pub fn expand_deriving_deep_clone(cx: &mut ExtCtxt,
                 // call deep_clone (not clone) here.
                 combine_substructure: |c, s, sub| cs_clone("DeepClone", c, s, sub)
             }
-        ]
+        )
     };
 
     trait_def.expand(cx, mitem, item, push)
@@ -80,7 +82,7 @@ fn cs_clone(
     let ctor_ident;
     let all_fields;
     let subcall = |field: &FieldInfo|
-        cx.expr_method_call(field.span, field.self_, clone_ident, ~[]);
+        cx.expr_method_call(field.span, field.self_, clone_ident, Vec::new());
 
     match *substr.fields {
         Struct(ref af) => {
@@ -99,7 +101,7 @@ fn cs_clone(
                                                                  name))
     }
 
-    if all_fields.len() >= 1 && all_fields[0].name.is_none() {
+    if all_fields.len() >= 1 && all_fields.get(0).name.is_none() {
         // enum-like
         let subcalls = all_fields.map(subcall);
         cx.expr_call_ident(trait_span, ctor_ident, subcalls)
diff --git a/src/libsyntax/ext/deriving/cmp/eq.rs b/src/libsyntax/ext/deriving/cmp/eq.rs
index b031f69084d33..1e7199ccc9557 100644
--- a/src/libsyntax/ext/deriving/cmp/eq.rs
+++ b/src/libsyntax/ext/deriving/cmp/eq.rs
@@ -14,6 +14,8 @@ use ext::base::ExtCtxt;
 use ext::build::AstBuilder;
 use ext::deriving::generic::*;
 
+use std::vec_ng::Vec;
+
 pub fn expand_deriving_eq(cx: &mut ExtCtxt,
                           span: Span,
                           mitem: @MetaItem,
@@ -36,8 +38,8 @@ pub fn expand_deriving_eq(cx: &mut ExtCtxt,
                 name: $name,
                 generics: LifetimeBounds::empty(),
                 explicit_self: borrowed_explicit_self(),
-                args: ~[borrowed_self()],
-                ret_ty: Literal(Path::new(~["bool"])),
+                args: vec!(borrowed_self()),
+                ret_ty: Literal(Path::new(vec!("bool"))),
                 inline: true,
                 const_nonmatching: true,
                 combine_substructure: $f
@@ -47,14 +49,14 @@ pub fn expand_deriving_eq(cx: &mut ExtCtxt,
 
     let trait_def = TraitDef {
         span: span,
-        attributes: ~[],
-        path: Path::new(~["std", "cmp", "Eq"]),
-        additional_bounds: ~[],
+        attributes: Vec::new(),
+        path: Path::new(vec!("std", "cmp", "Eq")),
+        additional_bounds: Vec::new(),
         generics: LifetimeBounds::empty(),
-        methods: ~[
+        methods: vec!(
             md!("eq", cs_eq),
             md!("ne", cs_ne)
-        ]
+        )
     };
     trait_def.expand(cx, mitem, item, push)
 }
diff --git a/src/libsyntax/ext/deriving/cmp/ord.rs b/src/libsyntax/ext/deriving/cmp/ord.rs
index 10a416045cbda..66f459882397c 100644
--- a/src/libsyntax/ext/deriving/cmp/ord.rs
+++ b/src/libsyntax/ext/deriving/cmp/ord.rs
@@ -15,6 +15,8 @@ use ext::base::ExtCtxt;
 use ext::build::AstBuilder;
 use ext::deriving::generic::*;
 
+use std::vec_ng::Vec;
+
 pub fn expand_deriving_ord(cx: &mut ExtCtxt,
                            span: Span,
                            mitem: @MetaItem,
@@ -26,8 +28,8 @@ pub fn expand_deriving_ord(cx: &mut ExtCtxt,
                 name: $name,
                 generics: LifetimeBounds::empty(),
                 explicit_self: borrowed_explicit_self(),
-                args: ~[borrowed_self()],
-                ret_ty: Literal(Path::new(~["bool"])),
+                args: vec!(borrowed_self()),
+                ret_ty: Literal(Path::new(vec!("bool"))),
                 inline: true,
                 const_nonmatching: false,
                 combine_substructure: |cx, span, substr| cs_op($op, $equal, cx, span, substr)
@@ -37,16 +39,16 @@ pub fn expand_deriving_ord(cx: &mut ExtCtxt,
 
     let trait_def = TraitDef {
         span: span,
-        attributes: ~[],
-        path: Path::new(~["std", "cmp", "Ord"]),
-        additional_bounds: ~[],
+        attributes: Vec::new(),
+        path: Path::new(vec!("std", "cmp", "Ord")),
+        additional_bounds: Vec::new(),
         generics: LifetimeBounds::empty(),
-        methods: ~[
+        methods: vec!(
             md!("lt", true, false),
             md!("le", true, true),
             md!("gt", false, false),
             md!("ge", false, true)
-        ]
+        )
     };
     trait_def.expand(cx, mitem, item, push)
 }
diff --git a/src/libsyntax/ext/deriving/cmp/totaleq.rs b/src/libsyntax/ext/deriving/cmp/totaleq.rs
index 2bfab8646a6aa..2b3c0b9ea6915 100644
--- a/src/libsyntax/ext/deriving/cmp/totaleq.rs
+++ b/src/libsyntax/ext/deriving/cmp/totaleq.rs
@@ -14,6 +14,8 @@ use ext::base::ExtCtxt;
 use ext::build::AstBuilder;
 use ext::deriving::generic::*;
 
+use std::vec_ng::Vec;
+
 pub fn expand_deriving_totaleq(cx: &mut ExtCtxt,
                                span: Span,
                                mitem: @MetaItem,
@@ -26,22 +28,22 @@ pub fn expand_deriving_totaleq(cx: &mut ExtCtxt,
 
     let trait_def = TraitDef {
         span: span,
-        attributes: ~[],
-        path: Path::new(~["std", "cmp", "TotalEq"]),
-        additional_bounds: ~[],
+        attributes: Vec::new(),
+        path: Path::new(vec!("std", "cmp", "TotalEq")),
+        additional_bounds: Vec::new(),
         generics: LifetimeBounds::empty(),
-        methods: ~[
+        methods: vec!(
             MethodDef {
                 name: "equals",
                 generics: LifetimeBounds::empty(),
                 explicit_self: borrowed_explicit_self(),
-                args: ~[borrowed_self()],
-                ret_ty: Literal(Path::new(~["bool"])),
+                args: vec!(borrowed_self()),
+                ret_ty: Literal(Path::new(vec!("bool"))),
                 inline: true,
                 const_nonmatching: true,
                 combine_substructure: cs_equals
             }
-        ]
+        )
     };
     trait_def.expand(cx, mitem, item, push)
 }
diff --git a/src/libsyntax/ext/deriving/cmp/totalord.rs b/src/libsyntax/ext/deriving/cmp/totalord.rs
index 2e6c4a5422892..89a344bdb7b3c 100644
--- a/src/libsyntax/ext/deriving/cmp/totalord.rs
+++ b/src/libsyntax/ext/deriving/cmp/totalord.rs
@@ -14,7 +14,9 @@ use codemap::Span;
 use ext::base::ExtCtxt;
 use ext::build::AstBuilder;
 use ext::deriving::generic::*;
+
 use std::cmp::{Ordering, Equal, Less, Greater};
+use std::vec_ng::Vec;
 
 pub fn expand_deriving_totalord(cx: &mut ExtCtxt,
                                 span: Span,
@@ -23,22 +25,22 @@ pub fn expand_deriving_totalord(cx: &mut ExtCtxt,
                                 push: |@Item|) {
     let trait_def = TraitDef {
         span: span,
-        attributes: ~[],
-        path: Path::new(~["std", "cmp", "TotalOrd"]),
-        additional_bounds: ~[],
+        attributes: Vec::new(),
+        path: Path::new(vec!("std", "cmp", "TotalOrd")),
+        additional_bounds: Vec::new(),
         generics: LifetimeBounds::empty(),
-        methods: ~[
+        methods: vec!(
             MethodDef {
                 name: "cmp",
                 generics: LifetimeBounds::empty(),
                 explicit_self: borrowed_explicit_self(),
-                args: ~[borrowed_self()],
-                ret_ty: Literal(Path::new(~["std", "cmp", "Ordering"])),
+                args: vec!(borrowed_self()),
+                ret_ty: Literal(Path::new(vec!("std", "cmp", "Ordering"))),
                 inline: true,
                 const_nonmatching: false,
                 combine_substructure: cs_cmp
             }
-        ]
+        )
     };
 
     trait_def.expand(cx, mitem, item, push)
@@ -52,9 +54,9 @@ pub fn ordering_const(cx: &mut ExtCtxt, span: Span, cnst: Ordering) -> ast::Path
         Greater => "Greater"
     };
     cx.path_global(span,
-                   ~[cx.ident_of("std"),
+                   vec!(cx.ident_of("std"),
                      cx.ident_of("cmp"),
-                     cx.ident_of(cnst)])
+                     cx.ident_of(cnst)))
 }
 
 pub fn cs_cmp(cx: &mut ExtCtxt, span: Span,
@@ -99,7 +101,7 @@ pub fn cs_cmp(cx: &mut ExtCtxt, span: Span,
             let if_ = cx.expr_if(span,
                                  cond,
                                  old, Some(cx.expr_ident(span, test_id)));
-            cx.expr_block(cx.block(span, ~[assign], Some(if_)))
+            cx.expr_block(cx.block(span, vec!(assign), Some(if_)))
         },
         cx.expr_path(equals_path.clone()),
         |cx, span, list, _| {
diff --git a/src/libsyntax/ext/deriving/decodable.rs b/src/libsyntax/ext/deriving/decodable.rs
index 7aaa66cbfb5de..bc6d69c7ccabe 100644
--- a/src/libsyntax/ext/deriving/decodable.rs
+++ b/src/libsyntax/ext/deriving/decodable.rs
@@ -21,6 +21,8 @@ use ext::deriving::generic::*;
 use parse::token::InternedString;
 use parse::token;
 
+use std::vec_ng::Vec;
+
 pub fn expand_deriving_decodable(cx: &mut ExtCtxt,
                                  span: Span,
                                  mitem: @MetaItem,
@@ -28,27 +30,26 @@ pub fn expand_deriving_decodable(cx: &mut ExtCtxt,
                                  push: |@Item|) {
     let trait_def = TraitDef {
         span: span,
-        attributes: ~[],
-        path: Path::new_(~["serialize", "Decodable"], None,
-                         ~[~Literal(Path::new_local("__D"))], true),
-        additional_bounds: ~[],
+        attributes: Vec::new(),
+        path: Path::new_(vec!("serialize", "Decodable"), None,
+                         vec!(~Literal(Path::new_local("__D"))), true),
+        additional_bounds: Vec::new(),
         generics: LifetimeBounds {
-            lifetimes: ~[],
-            bounds: ~[("__D", ~[Path::new(~["serialize", "Decoder"])])],
+            lifetimes: Vec::new(),
+            bounds: vec!(("__D", vec!(Path::new(vec!("serialize", "Decoder"))))),
         },
-        methods: ~[
+        methods: vec!(
             MethodDef {
                 name: "decode",
                 generics: LifetimeBounds::empty(),
                 explicit_self: None,
-                args: ~[Ptr(~Literal(Path::new_local("__D")),
-                            Borrowed(None, MutMutable))],
+                args: vec!(Ptr(~Literal(Path::new_local("__D")),
+                            Borrowed(None, MutMutable))),
                 ret_ty: Self,
                 inline: false,
                 const_nonmatching: true,
                 combine_substructure: decodable_substructure,
-            },
-        ]
+            })
     };
 
     trait_def.expand(cx, mitem, item, push)
@@ -57,13 +58,13 @@ pub fn expand_deriving_decodable(cx: &mut ExtCtxt,
 fn decodable_substructure(cx: &mut ExtCtxt, trait_span: Span,
                           substr: &Substructure) -> @Expr {
     let decoder = substr.nonself_args[0];
-    let recurse = ~[cx.ident_of("serialize"),
+    let recurse = vec!(cx.ident_of("serialize"),
                     cx.ident_of("Decodable"),
-                    cx.ident_of("decode")];
+                    cx.ident_of("decode"));
     // throw an underscore in front to suppress unused variable warnings
     let blkarg = cx.ident_of("_d");
     let blkdecoder = cx.expr_ident(trait_span, blkarg);
-    let calldecode = cx.expr_call_global(trait_span, recurse, ~[blkdecoder]);
+    let calldecode = cx.expr_call_global(trait_span, recurse, vec!(blkdecoder));
     let lambdadecode = cx.lambda_expr_1(trait_span, calldecode, blkarg);
 
     return match *substr.fields {
@@ -80,24 +81,24 @@ fn decodable_substructure(cx: &mut ExtCtxt, trait_span: Span,
                                               summary,
                                               |cx, span, name, field| {
                 cx.expr_method_call(span, blkdecoder, read_struct_field,
-                                    ~[cx.expr_str(span, name),
+                                    vec!(cx.expr_str(span, name),
                                       cx.expr_uint(span, field),
-                                      lambdadecode])
+                                      lambdadecode))
             });
             cx.expr_method_call(trait_span,
                                 decoder,
                                 cx.ident_of("read_struct"),
-                                ~[
+                                vec!(
                 cx.expr_str(trait_span, token::get_ident(substr.type_ident)),
                 cx.expr_uint(trait_span, nfields),
                 cx.lambda_expr_1(trait_span, result, blkarg)
-            ])
+            ))
         }
         StaticEnum(_, ref fields) => {
             let variant = cx.ident_of("i");
 
-            let mut arms = ~[];
-            let mut variants = ~[];
+            let mut arms = Vec::new();
+            let mut variants = Vec::new();
             let rvariant_arg = cx.ident_of("read_enum_variant_arg");
 
             for (i, &(name, v_span, ref parts)) in fields.iter().enumerate() {
@@ -110,29 +111,29 @@ fn decodable_substructure(cx: &mut ExtCtxt, trait_span: Span,
                                                    |cx, span, _, field| {
                     let idx = cx.expr_uint(span, field);
                     cx.expr_method_call(span, blkdecoder, rvariant_arg,
-                                        ~[idx, lambdadecode])
+                                        vec!(idx, lambdadecode))
                 });
 
                 arms.push(cx.arm(v_span,
-                                 ~[cx.pat_lit(v_span, cx.expr_uint(v_span, i))],
+                                 vec!(cx.pat_lit(v_span, cx.expr_uint(v_span, i))),
                                  decoded));
             }
 
             arms.push(cx.arm_unreachable(trait_span));
 
             let result = cx.expr_match(trait_span, cx.expr_ident(trait_span, variant), arms);
-            let lambda = cx.lambda_expr(trait_span, ~[blkarg, variant], result);
+            let lambda = cx.lambda_expr(trait_span, vec!(blkarg, variant), result);
             let variant_vec = cx.expr_vec(trait_span, variants);
             let result = cx.expr_method_call(trait_span, blkdecoder,
                                              cx.ident_of("read_enum_variant"),
-                                             ~[variant_vec, lambda]);
+                                             vec!(variant_vec, lambda));
             cx.expr_method_call(trait_span,
                                 decoder,
                                 cx.ident_of("read_enum"),
-                                ~[
+                                vec!(
                 cx.expr_str(trait_span, token::get_ident(substr.type_ident)),
                 cx.lambda_expr_1(trait_span, result, blkarg)
-            ])
+            ))
         }
         _ => cx.bug("expected StaticEnum or StaticStruct in deriving(Decodable)")
     };
diff --git a/src/libsyntax/ext/deriving/default.rs b/src/libsyntax/ext/deriving/default.rs
index c5ef86273b65a..8259459f57ab6 100644
--- a/src/libsyntax/ext/deriving/default.rs
+++ b/src/libsyntax/ext/deriving/default.rs
@@ -14,6 +14,8 @@ use ext::base::ExtCtxt;
 use ext::build::AstBuilder;
 use ext::deriving::generic::*;
 
+use std::vec_ng::Vec;
+
 pub fn expand_deriving_default(cx: &mut ExtCtxt,
                             span: Span,
                             mitem: @MetaItem,
@@ -21,34 +23,33 @@ pub fn expand_deriving_default(cx: &mut ExtCtxt,
                             push: |@Item|) {
     let trait_def = TraitDef {
         span: span,
-        attributes: ~[],
-        path: Path::new(~["std", "default", "Default"]),
-        additional_bounds: ~[],
+        attributes: Vec::new(),
+        path: Path::new(vec!("std", "default", "Default")),
+        additional_bounds: Vec::new(),
         generics: LifetimeBounds::empty(),
-        methods: ~[
+        methods: vec!(
             MethodDef {
                 name: "default",
                 generics: LifetimeBounds::empty(),
                 explicit_self: None,
-                args: ~[],
+                args: Vec::new(),
                 ret_ty: Self,
                 inline: true,
                 const_nonmatching: false,
                 combine_substructure: default_substructure
-            },
-        ]
+            })
     };
     trait_def.expand(cx, mitem, item, push)
 }
 
 fn default_substructure(cx: &mut ExtCtxt, trait_span: Span, substr: &Substructure) -> @Expr {
-    let default_ident = ~[
+    let default_ident = vec!(
         cx.ident_of("std"),
         cx.ident_of("default"),
         cx.ident_of("Default"),
         cx.ident_of("default")
-    ];
-    let default_call = |span| cx.expr_call_global(span, default_ident.clone(), ~[]);
+    );
+    let default_call = |span| cx.expr_call_global(span, default_ident.clone(), Vec::new());
 
     return match *substr.fields {
         StaticStruct(_, ref summary) => {
diff --git a/src/libsyntax/ext/deriving/encodable.rs b/src/libsyntax/ext/deriving/encodable.rs
index ae23013b7ccc6..091ff7b9c90bd 100644
--- a/src/libsyntax/ext/deriving/encodable.rs
+++ b/src/libsyntax/ext/deriving/encodable.rs
@@ -89,6 +89,8 @@ use ext::build::AstBuilder;
 use ext::deriving::generic::*;
 use parse::token;
 
+use std::vec_ng::Vec;
+
 pub fn expand_deriving_encodable(cx: &mut ExtCtxt,
                                  span: Span,
                                  mitem: @MetaItem,
@@ -96,27 +98,26 @@ pub fn expand_deriving_encodable(cx: &mut ExtCtxt,
                                  push: |@Item|) {
     let trait_def = TraitDef {
         span: span,
-        attributes: ~[],
-        path: Path::new_(~["serialize", "Encodable"], None,
-                         ~[~Literal(Path::new_local("__E"))], true),
-        additional_bounds: ~[],
+        attributes: Vec::new(),
+        path: Path::new_(vec!("serialize", "Encodable"), None,
+                         vec!(~Literal(Path::new_local("__E"))), true),
+        additional_bounds: Vec::new(),
         generics: LifetimeBounds {
-            lifetimes: ~[],
-            bounds: ~[("__E", ~[Path::new(~["serialize", "Encoder"])])],
+            lifetimes: Vec::new(),
+            bounds: vec!(("__E", vec!(Path::new(vec!("serialize", "Encoder"))))),
         },
-        methods: ~[
+        methods: vec!(
             MethodDef {
                 name: "encode",
                 generics: LifetimeBounds::empty(),
                 explicit_self: borrowed_explicit_self(),
-                args: ~[Ptr(~Literal(Path::new_local("__E")),
-                            Borrowed(None, MutMutable))],
+                args: vec!(Ptr(~Literal(Path::new_local("__E")),
+                            Borrowed(None, MutMutable))),
                 ret_ty: nil_ty(),
                 inline: false,
                 const_nonmatching: true,
                 combine_substructure: encodable_substructure,
-            },
-        ]
+            })
     };
 
     trait_def.expand(cx, mitem, item, push)
@@ -133,7 +134,7 @@ fn encodable_substructure(cx: &mut ExtCtxt, trait_span: Span,
     return match *substr.fields {
         Struct(ref fields) => {
             let emit_struct_field = cx.ident_of("emit_struct_field");
-            let mut stmts = ~[];
+            let mut stmts = Vec::new();
             for (i, &FieldInfo {
                     name,
                     self_,
@@ -146,13 +147,13 @@ fn encodable_substructure(cx: &mut ExtCtxt, trait_span: Span,
                         token::intern_and_get_ident(format!("_field{}", i))
                     }
                 };
-                let enc = cx.expr_method_call(span, self_, encode, ~[blkencoder]);
+                let enc = cx.expr_method_call(span, self_, encode, vec!(blkencoder));
                 let lambda = cx.lambda_expr_1(span, enc, blkarg);
                 let call = cx.expr_method_call(span, blkencoder,
                                                emit_struct_field,
-                                               ~[cx.expr_str(span, name),
+                                               vec!(cx.expr_str(span, name),
                                                  cx.expr_uint(span, i),
-                                                 lambda]);
+                                                 lambda));
                 stmts.push(cx.stmt_expr(call));
             }
 
@@ -160,11 +161,11 @@ fn encodable_substructure(cx: &mut ExtCtxt, trait_span: Span,
             cx.expr_method_call(trait_span,
                                 encoder,
                                 cx.ident_of("emit_struct"),
-                                ~[
+                                vec!(
                 cx.expr_str(trait_span, token::get_ident(substr.type_ident)),
                 cx.expr_uint(trait_span, fields.len()),
                 blk
-            ])
+            ))
         }
 
         EnumMatching(idx, variant, ref fields) => {
@@ -175,14 +176,14 @@ fn encodable_substructure(cx: &mut ExtCtxt, trait_span: Span,
             let me = cx.stmt_let(trait_span, false, blkarg, encoder);
             let encoder = cx.expr_ident(trait_span, blkarg);
             let emit_variant_arg = cx.ident_of("emit_enum_variant_arg");
-            let mut stmts = ~[];
+            let mut stmts = Vec::new();
             for (i, &FieldInfo { self_, span, .. }) in fields.iter().enumerate() {
-                let enc = cx.expr_method_call(span, self_, encode, ~[blkencoder]);
+                let enc = cx.expr_method_call(span, self_, encode, vec!(blkencoder));
                 let lambda = cx.lambda_expr_1(span, enc, blkarg);
                 let call = cx.expr_method_call(span, blkencoder,
                                                emit_variant_arg,
-                                               ~[cx.expr_uint(span, i),
-                                                 lambda]);
+                                               vec!(cx.expr_uint(span, i),
+                                                 lambda));
                 stmts.push(cx.stmt_expr(call));
             }
 
@@ -190,19 +191,19 @@ fn encodable_substructure(cx: &mut ExtCtxt, trait_span: Span,
             let name = cx.expr_str(trait_span, token::get_ident(variant.node.name));
             let call = cx.expr_method_call(trait_span, blkencoder,
                                            cx.ident_of("emit_enum_variant"),
-                                           ~[name,
+                                           vec!(name,
                                              cx.expr_uint(trait_span, idx),
                                              cx.expr_uint(trait_span, fields.len()),
-                                             blk]);
+                                             blk));
             let blk = cx.lambda_expr_1(trait_span, call, blkarg);
             let ret = cx.expr_method_call(trait_span,
                                           encoder,
                                           cx.ident_of("emit_enum"),
-                                          ~[
+                                          vec!(
                 cx.expr_str(trait_span, token::get_ident(substr.type_ident)),
                 blk
-            ]);
-            cx.expr_block(cx.block(trait_span, ~[me], Some(ret)))
+            ));
+            cx.expr_block(cx.block(trait_span, vec!(me), Some(ret)))
         }
 
         _ => cx.bug("expected Struct or EnumMatching in deriving(Encodable)")
diff --git a/src/libsyntax/ext/deriving/generic.rs b/src/libsyntax/ext/deriving/generic.rs
index 24d4efb1b0e68..1dc474551cf7c 100644
--- a/src/libsyntax/ext/deriving/generic.rs
+++ b/src/libsyntax/ext/deriving/generic.rs
@@ -188,7 +188,8 @@ use opt_vec;
 use parse::token::InternedString;
 use parse::token;
 
-use std::vec;
+use std::vec_ng::Vec;
+use std::vec_ng;
 
 pub use self::ty::*;
 mod ty;
@@ -197,20 +198,19 @@ pub struct TraitDef<'a> {
     /// The span for the current #[deriving(Foo)] header.
     span: Span,
 
-    attributes: ~[ast::Attribute],
+    attributes: Vec<ast::Attribute> ,
 
     /// Path of the trait, including any type parameters
     path: Path<'a>,
 
     /// Additional bounds required of any type parameters of the type,
     /// other than the current trait
-    additional_bounds: ~[Ty<'a>],
+    additional_bounds: Vec<Ty<'a>> ,
 
     /// Any extra lifetimes and/or bounds, e.g. `D: serialize::Decoder`
     generics: LifetimeBounds<'a>,
 
-    methods: ~[MethodDef<'a>]
-}
+    methods: Vec<MethodDef<'a>> }
 
 
 pub struct MethodDef<'a> {
@@ -225,7 +225,7 @@ pub struct MethodDef<'a> {
     explicit_self: Option<Option<PtrTy<'a>>>,
 
     /// Arguments other than the self argument
-    args: ~[Ty<'a>],
+    args: Vec<Ty<'a>> ,
 
     /// Return type
     ret_ty: Ty<'a>,
@@ -264,39 +264,38 @@ pub struct FieldInfo {
     self_: @Expr,
     /// The expressions corresponding to references to this field in
     /// the other Self arguments.
-    other: ~[@Expr]
-}
+    other: Vec<@Expr> }
 
 /// Fields for a static method
 pub enum StaticFields {
     /// Tuple structs/enum variants like this
-    Unnamed(~[Span]),
+    Unnamed(Vec<Span> ),
     /// Normal structs/struct variants.
-    Named(~[(Ident, Span)])
+    Named(Vec<(Ident, Span)> )
 }
 
 /// A summary of the possible sets of fields. See above for details
 /// and examples
 pub enum SubstructureFields<'a> {
-    Struct(~[FieldInfo]),
+    Struct(Vec<FieldInfo> ),
     /**
     Matching variants of the enum: variant index, ast::Variant,
     fields: the field name is only non-`None` in the case of a struct
     variant.
     */
-    EnumMatching(uint, &'a ast::Variant, ~[FieldInfo]),
+    EnumMatching(uint, &'a ast::Variant, Vec<FieldInfo> ),
 
     /**
     non-matching variants of the enum, [(variant index, ast::Variant,
     [field span, field ident, fields])] (i.e. all fields for self are in the
     first tuple, for other1 are in the second tuple, etc.)
     */
-    EnumNonMatching(&'a [(uint, P<ast::Variant>, ~[(Span, Option<Ident>, @Expr)])]),
+    EnumNonMatching(&'a [(uint, P<ast::Variant>, Vec<(Span, Option<Ident>, @Expr)> )]),
 
     /// A static method where Self is a struct.
     StaticStruct(&'a ast::StructDef, StaticFields),
     /// A static method where Self is an enum.
-    StaticEnum(&'a ast::EnumDef, ~[(Ident, Span, StaticFields)])
+    StaticEnum(&'a ast::EnumDef, Vec<(Ident, Span, StaticFields)> )
 }
 
 
@@ -316,7 +315,7 @@ representing each variant: (variant index, ast::Variant instance,
 pub type EnumNonMatchFunc<'a> =
     'a |&mut ExtCtxt,
            Span,
-           &[(uint, P<ast::Variant>, ~[(Span, Option<Ident>, @Expr)])],
+           &[(uint, P<ast::Variant>, Vec<(Span, Option<Ident>, @Expr)> )],
            &[@Expr]|
            -> @Expr;
 
@@ -360,7 +359,7 @@ impl<'a> TraitDef<'a> {
                            cx: &mut ExtCtxt,
                            type_ident: Ident,
                            generics: &Generics,
-                           methods: ~[@ast::Method]) -> @ast::Item {
+                           methods: Vec<@ast::Method> ) -> @ast::Item {
         let trait_path = self.path.to_path(cx, self.span, type_ident, generics);
 
         let mut trait_generics = self.generics.to_generics(cx, self.span,
@@ -397,7 +396,7 @@ impl<'a> TraitDef<'a> {
 
         // Create the type of `self`.
         let self_type = cx.ty_path(
-            cx.path_all(self.span, false, ~[ type_ident ], self_lifetimes,
+            cx.path_all(self.span, false, vec!( type_ident ), self_lifetimes,
                         opt_vec::take_vec(self_ty_params)), None);
 
         let doc_attr = cx.attribute(
@@ -412,7 +411,7 @@ impl<'a> TraitDef<'a> {
         cx.item(
             self.span,
             ident,
-            vec::append(~[doc_attr], self.attributes),
+            vec_ng::append(vec!(doc_attr), self.attributes.as_slice()),
             ast::ItemImpl(trait_generics, opt_trait_ref,
                           self_type, methods.map(|x| *x)))
     }
@@ -433,13 +432,15 @@ impl<'a> TraitDef<'a> {
                     self,
                     struct_def,
                     type_ident,
-                    self_args, nonself_args)
+                    self_args.as_slice(),
+                    nonself_args.as_slice())
             } else {
                 method_def.expand_struct_method_body(cx,
                                                      self,
                                                      struct_def,
                                                      type_ident,
-                                                     self_args, nonself_args)
+                                                     self_args.as_slice(),
+                                                     nonself_args.as_slice())
             };
 
             method_def.create_method(cx, self,
@@ -467,13 +468,15 @@ impl<'a> TraitDef<'a> {
                     self,
                     enum_def,
                     type_ident,
-                    self_args, nonself_args)
+                    self_args.as_slice(),
+                    nonself_args.as_slice())
             } else {
                 method_def.expand_enum_method_body(cx,
                                                    self,
                                                    enum_def,
                                                    type_ident,
-                                                   self_args, nonself_args)
+                                                   self_args.as_slice(),
+                                                   nonself_args.as_slice())
             };
 
             method_def.create_method(cx, self,
@@ -524,11 +527,11 @@ impl<'a> MethodDef<'a> {
                                trait_: &TraitDef,
                                type_ident: Ident,
                                generics: &Generics)
-        -> (ast::ExplicitSelf, ~[@Expr], ~[@Expr], ~[(Ident, P<ast::Ty>)]) {
+        -> (ast::ExplicitSelf, Vec<@Expr> , Vec<@Expr> , Vec<(Ident, P<ast::Ty>)> ) {
 
-        let mut self_args = ~[];
-        let mut nonself_args = ~[];
-        let mut arg_tys = ~[];
+        let mut self_args = Vec::new();
+        let mut nonself_args = Vec::new();
+        let mut arg_tys = Vec::new();
         let mut nonstatic = false;
 
         let ast_explicit_self = match self.explicit_self {
@@ -575,7 +578,7 @@ impl<'a> MethodDef<'a> {
                      type_ident: Ident,
                      generics: &Generics,
                      explicit_self: ast::ExplicitSelf,
-                     arg_types: ~[(Ident, P<ast::Ty>)],
+                     arg_types: Vec<(Ident, P<ast::Ty>)> ,
                      body: @Expr) -> @ast::Method {
         // create the generics that aren't for Self
         let fn_generics = self.generics.to_generics(cx, trait_.span, type_ident, generics);
@@ -598,16 +601,16 @@ impl<'a> MethodDef<'a> {
         let body_block = cx.block_expr(body);
 
         let attrs = if self.inline {
-            ~[
+            vec!(
                 cx
                       .attribute(trait_.span,
                                  cx
                                        .meta_word(trait_.span,
                                                   InternedString::new(
                                                       "inline")))
-            ]
+            )
         } else {
-            ~[]
+            Vec::new()
         };
 
         // Create the method.
@@ -655,9 +658,9 @@ impl<'a> MethodDef<'a> {
                                  nonself_args: &[@Expr])
         -> @Expr {
 
-        let mut raw_fields = ~[]; // ~[[fields of self],
+        let mut raw_fields = Vec::new(); // ~[[fields of self],
                                  // [fields of next Self arg], [etc]]
-        let mut patterns = ~[];
+        let mut patterns = Vec::new();
         for i in range(0u, self_args.len()) {
             let (pat, ident_expr) = trait_.create_struct_pattern(cx, type_ident, struct_def,
                                                                  format!("__self_{}", i),
@@ -668,14 +671,15 @@ impl<'a> MethodDef<'a> {
 
         // transpose raw_fields
         let fields = if raw_fields.len() > 0 {
-            raw_fields[0].iter()
-                         .enumerate()
-                         .map(|(i, &(span, opt_id, field))| {
-                let other_fields = raw_fields.tail().map(|l| {
-                    match &l[i] {
+            raw_fields.get(0)
+                      .iter()
+                      .enumerate()
+                      .map(|(i, &(span, opt_id, field))| {
+                let other_fields = raw_fields.tail().iter().map(|l| {
+                    match l.get(i) {
                         &(_, _, ex) => ex
                     }
-                });
+                }).collect();
                 FieldInfo {
                     span: span,
                     name: opt_id,
@@ -703,7 +707,7 @@ impl<'a> MethodDef<'a> {
         // matter.
         for (&arg_expr, &pat) in self_args.iter().zip(patterns.iter()) {
             body = cx.expr_match(trait_.span, arg_expr,
-                                     ~[ cx.arm(trait_.span, ~[pat], body) ])
+                                     vec!( cx.arm(trait_.span, vec!(pat), body) ))
         }
         body
     }
@@ -759,7 +763,7 @@ impl<'a> MethodDef<'a> {
                                self_args: &[@Expr],
                                nonself_args: &[@Expr])
                                -> @Expr {
-        let mut matches = ~[];
+        let mut matches = Vec::new();
         self.build_enum_match(cx, trait_, enum_def, type_ident,
                               self_args, nonself_args,
                               None, &mut matches, 0)
@@ -795,8 +799,8 @@ impl<'a> MethodDef<'a> {
                         self_args: &[@Expr],
                         nonself_args: &[@Expr],
                         matching: Option<uint>,
-                        matches_so_far: &mut ~[(uint, P<ast::Variant>,
-                                              ~[(Span, Option<Ident>, @Expr)])],
+                        matches_so_far: &mut Vec<(uint, P<ast::Variant>,
+                                              Vec<(Span, Option<Ident>, @Expr)> )> ,
                         match_count: uint) -> @Expr {
         if match_count == self_args.len() {
             // we've matched against all arguments, so make the final
@@ -822,17 +826,17 @@ impl<'a> MethodDef<'a> {
                 Some(variant_index) => {
                     // `ref` inside let matches is buggy. Causes havoc wih rusc.
                     // let (variant_index, ref self_vec) = matches_so_far[0];
-                    let (variant, self_vec) = match matches_so_far[0] {
-                        (_, v, ref s) => (v, s)
+                    let (variant, self_vec) = match matches_so_far.get(0) {
+                        &(_, v, ref s) => (v, s)
                     };
 
-                    let mut enum_matching_fields = vec::from_elem(self_vec.len(), ~[]);
+                    let mut enum_matching_fields = Vec::from_elem(self_vec.len(), Vec::new());
 
                     for triple in matches_so_far.tail().iter() {
                         match triple {
                             &(_, _, ref other_fields) => {
                                 for (i, &(_, _, e)) in other_fields.iter().enumerate() {
-                                    enum_matching_fields[i].push(e);
+                                    enum_matching_fields.get_mut(i).push(e);
                                 }
                             }
                         }
@@ -851,7 +855,7 @@ impl<'a> MethodDef<'a> {
                     substructure = EnumMatching(variant_index, variant, field_tuples);
                 }
                 None => {
-                    substructure = EnumNonMatching(*matches_so_far);
+                    substructure = EnumNonMatching(matches_so_far.as_slice());
                 }
             }
             self.call_substructure_method(cx, trait_, type_ident,
@@ -865,7 +869,7 @@ impl<'a> MethodDef<'a> {
                 format!("__arg_{}", match_count)
             };
 
-            let mut arms = ~[];
+            let mut arms = Vec::new();
 
             // the code for nonmatching variants only matters when
             // we've seen at least one other variant already
@@ -879,7 +883,7 @@ impl<'a> MethodDef<'a> {
                 };
 
                 // matching-variant match
-                let variant = enum_def.variants[index];
+                let variant = *enum_def.variants.get(index);
                 let (pattern, idents) = trait_.create_enum_variant_pattern(cx,
                                                                            variant,
                                                                            current_match_str,
@@ -895,7 +899,7 @@ impl<'a> MethodDef<'a> {
                                                      matches_so_far,
                                                      match_count + 1);
                 matches_so_far.pop().unwrap();
-                arms.push(cx.arm(trait_.span, ~[ pattern ], arm_expr));
+                arms.push(cx.arm(trait_.span, vec!( pattern ), arm_expr));
 
                 if enum_def.variants.len() > 1 {
                     let e = &EnumNonMatching(&[]);
@@ -904,7 +908,7 @@ impl<'a> MethodDef<'a> {
                                                                   e);
                     let wild_arm = cx.arm(
                         trait_.span,
-                        ~[ cx.pat_wild(trait_.span) ],
+                        vec!( cx.pat_wild(trait_.span) ),
                         wild_expr);
                     arms.push(wild_arm);
                 }
@@ -933,7 +937,7 @@ impl<'a> MethodDef<'a> {
                                                          match_count + 1);
                     matches_so_far.pop().unwrap();
 
-                    let arm = cx.arm(trait_.span, ~[ pattern ], arm_expr);
+                    let arm = cx.arm(trait_.span, vec!( pattern ), arm_expr);
                     arms.push(arm);
                 }
             }
@@ -997,8 +1001,8 @@ impl<'a> TraitDef<'a> {
     fn summarise_struct(&self,
                         cx: &mut ExtCtxt,
                         struct_def: &StructDef) -> StaticFields {
-        let mut named_idents = ~[];
-        let mut just_spans = ~[];
+        let mut named_idents = Vec::new();
+        let mut just_spans = Vec::new();
         for field in struct_def.fields.iter(){
             let sp = self.set_expn_info(cx, field.span);
             match field.node.kind {
@@ -1020,9 +1024,9 @@ impl<'a> TraitDef<'a> {
 
     fn create_subpatterns(&self,
                           cx: &mut ExtCtxt,
-                          field_paths: ~[ast::Path],
+                          field_paths: Vec<ast::Path> ,
                           mutbl: ast::Mutability)
-                          -> ~[@ast::Pat] {
+                          -> Vec<@ast::Pat> {
         field_paths.map(|path| {
             cx.pat(path.span,
                         ast::PatIdent(ast::BindByRef(mutbl), (*path).clone(), None))
@@ -1035,18 +1039,18 @@ impl<'a> TraitDef<'a> {
                              struct_def: &StructDef,
                              prefix: &str,
                              mutbl: ast::Mutability)
-                             -> (@ast::Pat, ~[(Span, Option<Ident>, @Expr)]) {
+                             -> (@ast::Pat, Vec<(Span, Option<Ident>, @Expr)> ) {
         if struct_def.fields.is_empty() {
             return (
                 cx.pat_ident_binding_mode(
                     self.span, struct_ident, ast::BindByValue(ast::MutImmutable)),
-                ~[]);
+                Vec::new());
         }
 
-        let matching_path = cx.path(self.span, ~[ struct_ident ]);
+        let matching_path = cx.path(self.span, vec!( struct_ident ));
 
-        let mut paths = ~[];
-        let mut ident_expr = ~[];
+        let mut paths = Vec::new();
+        let mut ident_expr = Vec::new();
         let mut struct_type = Unknown;
 
         for (i, struct_field) in struct_def.fields.iter().enumerate() {
@@ -1096,20 +1100,20 @@ impl<'a> TraitDef<'a> {
                                    variant: &ast::Variant,
                                    prefix: &str,
                                    mutbl: ast::Mutability)
-        -> (@ast::Pat, ~[(Span, Option<Ident>, @Expr)]) {
+        -> (@ast::Pat, Vec<(Span, Option<Ident>, @Expr)> ) {
         let variant_ident = variant.node.name;
         match variant.node.kind {
             ast::TupleVariantKind(ref variant_args) => {
                 if variant_args.is_empty() {
                     return (cx.pat_ident_binding_mode(variant.span, variant_ident,
                                                           ast::BindByValue(ast::MutImmutable)),
-                            ~[]);
+                            Vec::new());
                 }
 
                 let matching_path = cx.path_ident(variant.span, variant_ident);
 
-                let mut paths = ~[];
-                let mut ident_expr = ~[];
+                let mut paths = Vec::new();
+                let mut ident_expr = Vec::new();
                 for (i, va) in variant_args.iter().enumerate() {
                     let sp = self.set_expn_info(cx, va.ty.span);
                     let path = cx.path_ident(sp, cx.ident_of(format!("{}_{}", prefix, i)));
@@ -1151,11 +1155,19 @@ pub fn cs_fold(use_foldl: bool,
         EnumMatching(_, _, ref all_fields) | Struct(ref all_fields) => {
             if use_foldl {
                 all_fields.iter().fold(base, |old, field| {
-                    f(cx, field.span, old, field.self_, field.other)
+                    f(cx,
+                      field.span,
+                      old,
+                      field.self_,
+                      field.other.as_slice())
                 })
             } else {
                 all_fields.rev_iter().fold(base, |old, field| {
-                    f(cx, field.span, old, field.self_, field.other)
+                    f(cx,
+                      field.span,
+                      old,
+                      field.self_,
+                      field.other.as_slice())
                 })
             }
         },
@@ -1179,7 +1191,7 @@ f(cx, span, ~[self_1.method(__arg_1_1, __arg_2_1),
 ~~~
 */
 #[inline]
-pub fn cs_same_method(f: |&mut ExtCtxt, Span, ~[@Expr]| -> @Expr,
+pub fn cs_same_method(f: |&mut ExtCtxt, Span, Vec<@Expr> | -> @Expr,
                       enum_nonmatch_f: EnumNonMatchFunc,
                       cx: &mut ExtCtxt,
                       trait_span: Span,
diff --git a/src/libsyntax/ext/deriving/hash.rs b/src/libsyntax/ext/deriving/hash.rs
index acae4f9efa616..1d6cfab120d2d 100644
--- a/src/libsyntax/ext/deriving/hash.rs
+++ b/src/libsyntax/ext/deriving/hash.rs
@@ -14,6 +14,8 @@ use ext::base::ExtCtxt;
 use ext::build::AstBuilder;
 use ext::deriving::generic::*;
 
+use std::vec_ng::Vec;
+
 pub fn expand_deriving_hash(cx: &mut ExtCtxt,
                             span: Span,
                             mitem: @MetaItem,
@@ -22,23 +24,23 @@ pub fn expand_deriving_hash(cx: &mut ExtCtxt,
 
     let hash_trait_def = TraitDef {
         span: span,
-        attributes: ~[],
-        path: Path::new(~["std", "hash", "Hash"]),
-        additional_bounds: ~[],
+        attributes: Vec::new(),
+        path: Path::new(vec!("std", "hash", "Hash")),
+        additional_bounds: Vec::new(),
         generics: LifetimeBounds::empty(),
-        methods: ~[
+        methods: vec!(
             MethodDef {
                 name: "hash",
                 generics: LifetimeBounds::empty(),
                 explicit_self: borrowed_explicit_self(),
-                args: ~[Ptr(~Literal(Path::new(~["std", "hash", "sip", "SipState"])),
-                            Borrowed(None, MutMutable))],
+                args: vec!(Ptr(~Literal(Path::new(vec!("std", "hash", "sip", "SipState"))),
+                            Borrowed(None, MutMutable))),
                 ret_ty: nil_ty(),
                 inline: true,
                 const_nonmatching: false,
                 combine_substructure: hash_substructure
             }
-        ]
+        )
     };
 
     hash_trait_def.expand(cx, mitem, item, push);
@@ -51,10 +53,10 @@ fn hash_substructure(cx: &mut ExtCtxt, trait_span: Span, substr: &Substructure)
     };
     let hash_ident = substr.method_ident;
     let call_hash = |span, thing_expr| {
-        let expr = cx.expr_method_call(span, thing_expr, hash_ident, ~[state_expr]);
+        let expr = cx.expr_method_call(span, thing_expr, hash_ident, vec!(state_expr));
         cx.stmt_expr(expr)
     };
-    let mut stmts = ~[];
+    let mut stmts = Vec::new();
 
     let fields = match *substr.fields {
         Struct(ref fs) => fs,
diff --git a/src/libsyntax/ext/deriving/primitive.rs b/src/libsyntax/ext/deriving/primitive.rs
index 03192cc1cd2f2..ecd042eb172ef 100644
--- a/src/libsyntax/ext/deriving/primitive.rs
+++ b/src/libsyntax/ext/deriving/primitive.rs
@@ -16,6 +16,8 @@ use ext::build::AstBuilder;
 use ext::deriving::generic::*;
 use parse::token::InternedString;
 
+use std::vec_ng::Vec;
+
 pub fn expand_deriving_from_primitive(cx: &mut ExtCtxt,
                                       span: Span,
                                       mitem: @MetaItem,
@@ -23,21 +25,20 @@ pub fn expand_deriving_from_primitive(cx: &mut ExtCtxt,
                                       push: |@Item|) {
     let trait_def = TraitDef {
         span: span,
-        attributes: ~[],
-        path: Path::new(~["std", "num", "FromPrimitive"]),
-        additional_bounds: ~[],
+        attributes: Vec::new(),
+        path: Path::new(vec!("std", "num", "FromPrimitive")),
+        additional_bounds: Vec::new(),
         generics: LifetimeBounds::empty(),
-        methods: ~[
+        methods: vec!(
             MethodDef {
                 name: "from_i64",
                 generics: LifetimeBounds::empty(),
                 explicit_self: None,
-                args: ~[
-                    Literal(Path::new(~["i64"])),
-                ],
-                ret_ty: Literal(Path::new_(~["std", "option", "Option"],
+                args: vec!(
+                    Literal(Path::new(vec!("i64")))),
+                ret_ty: Literal(Path::new_(vec!("std", "option", "Option"),
                                            None,
-                                           ~[~Self],
+                                           vec!(~Self),
                                            true)),
                 // liable to cause code-bloat
                 inline: true,
@@ -48,19 +49,17 @@ pub fn expand_deriving_from_primitive(cx: &mut ExtCtxt,
                 name: "from_u64",
                 generics: LifetimeBounds::empty(),
                 explicit_self: None,
-                args: ~[
-                    Literal(Path::new(~["u64"])),
-                ],
-                ret_ty: Literal(Path::new_(~["std", "option", "Option"],
+                args: vec!(
+                    Literal(Path::new(vec!("u64")))),
+                ret_ty: Literal(Path::new_(vec!("std", "option", "Option"),
                                            None,
-                                           ~[~Self],
+                                           vec!(~Self),
                                            true)),
                 // liable to cause code-bloat
                 inline: true,
                 const_nonmatching: false,
                 combine_substructure: |c, s, sub| cs_from("u64", c, s, sub),
-            },
-        ]
+            })
     };
 
     trait_def.expand(cx, mitem, item, push)
@@ -84,7 +83,7 @@ fn cs_from(name: &str, cx: &mut ExtCtxt, trait_span: Span, substr: &Substructure
                 return cx.expr_fail(trait_span, InternedString::new(""));
             }
 
-            let mut arms = ~[];
+            let mut arms = Vec::new();
 
             for variant in enum_def.variants.iter() {
                 match variant.node.kind {
@@ -109,7 +108,7 @@ fn cs_from(name: &str, cx: &mut ExtCtxt, trait_span: Span, substr: &Substructure
 
                         // arm for `_ if $guard => $body`
                         let arm = ast::Arm {
-                            pats: ~[cx.pat_wild(span)],
+                            pats: vec!(cx.pat_wild(span)),
                             guard: Some(guard),
                             body: cx.block_expr(body),
                         };
@@ -128,7 +127,7 @@ fn cs_from(name: &str, cx: &mut ExtCtxt, trait_span: Span, substr: &Substructure
 
             // arm for `_ => None`
             let arm = ast::Arm {
-                pats: ~[cx.pat_wild(trait_span)],
+                pats: vec!(cx.pat_wild(trait_span)),
                 guard: None,
                 body: cx.block_expr(cx.expr_none(trait_span)),
             };
diff --git a/src/libsyntax/ext/deriving/rand.rs b/src/libsyntax/ext/deriving/rand.rs
index 6efe480159280..da9679eb65578 100644
--- a/src/libsyntax/ext/deriving/rand.rs
+++ b/src/libsyntax/ext/deriving/rand.rs
@@ -16,6 +16,8 @@ use ext::build::{AstBuilder};
 use ext::deriving::generic::*;
 use opt_vec;
 
+use std::vec_ng::Vec;
+
 pub fn expand_deriving_rand(cx: &mut ExtCtxt,
                             span: Span,
                             mitem: @MetaItem,
@@ -23,48 +25,48 @@ pub fn expand_deriving_rand(cx: &mut ExtCtxt,
                             push: |@Item|) {
     let trait_def = TraitDef {
         span: span,
-        attributes: ~[],
-        path: Path::new(~["std", "rand", "Rand"]),
-        additional_bounds: ~[],
+        attributes: Vec::new(),
+        path: Path::new(vec!("std", "rand", "Rand")),
+        additional_bounds: Vec::new(),
         generics: LifetimeBounds::empty(),
-        methods: ~[
+        methods: vec!(
             MethodDef {
                 name: "rand",
                 generics: LifetimeBounds {
-                    lifetimes: ~[],
-                    bounds: ~[("R",
-                               ~[ Path::new(~["std", "rand", "Rng"]) ])]
+                    lifetimes: Vec::new(),
+                    bounds: vec!(("R",
+                               vec!( Path::new(vec!("std", "rand", "Rng")) )))
                 },
                 explicit_self: None,
-                args: ~[
+                args: vec!(
                     Ptr(~Literal(Path::new_local("R")),
                         Borrowed(None, ast::MutMutable))
-                ],
+                ),
                 ret_ty: Self,
                 inline: false,
                 const_nonmatching: false,
                 combine_substructure: rand_substructure
             }
-        ]
+        )
     };
     trait_def.expand(cx, mitem, item, push)
 }
 
 fn rand_substructure(cx: &mut ExtCtxt, trait_span: Span, substr: &Substructure) -> @Expr {
     let rng = match substr.nonself_args {
-        [rng] => ~[ rng ],
+        [rng] => vec!( rng ),
         _ => cx.bug("Incorrect number of arguments to `rand` in `deriving(Rand)`")
     };
-    let rand_ident = ~[
+    let rand_ident = vec!(
         cx.ident_of("std"),
         cx.ident_of("rand"),
         cx.ident_of("Rand"),
         cx.ident_of("rand")
-    ];
+    );
     let rand_call = |cx: &mut ExtCtxt, span| {
         cx.expr_call_global(span,
                             rand_ident.clone(),
-                            ~[ rng[0] ])
+                            vec!( *rng.get(0) ))
     };
 
     return match *substr.fields {
@@ -84,13 +86,13 @@ fn rand_substructure(cx: &mut ExtCtxt, trait_span: Span, substr: &Substructure)
                                         true,
                                         rand_ident.clone(),
                                         opt_vec::Empty,
-                                        ~[]);
+                                        Vec::new());
             let rand_name = cx.expr_path(rand_name);
 
             // ::std::rand::Rand::rand(rng)
             let rv_call = cx.expr_call(trait_span,
                                        rand_name,
-                                       ~[ rng[0] ]);
+                                       vec!( *rng.get(0) ));
 
             // need to specify the uint-ness of the random number
             let uint_ty = cx.ty_ident(trait_span, cx.ident_of("uint"));
@@ -113,15 +115,15 @@ fn rand_substructure(cx: &mut ExtCtxt, trait_span: Span, substr: &Substructure)
                 let pat = cx.pat_lit(v_span, i_expr);
 
                 let thing = rand_thing(cx, v_span, ident, summary, |cx, sp| rand_call(cx, sp));
-                cx.arm(v_span, ~[ pat ], thing)
-            }).collect::<~[ast::Arm]>();
+                cx.arm(v_span, vec!( pat ), thing)
+            }).collect::<Vec<ast::Arm> >();
 
             // _ => {} at the end. Should never occur
             arms.push(cx.arm_unreachable(trait_span));
 
             let match_expr = cx.expr_match(trait_span, rand_variant, arms);
 
-            let block = cx.block(trait_span, ~[ let_statement ], Some(match_expr));
+            let block = cx.block(trait_span, vec!( let_statement ), Some(match_expr));
             cx.expr_block(block)
         }
         _ => cx.bug("Non-static method in `deriving(Rand)`")
diff --git a/src/libsyntax/ext/deriving/show.rs b/src/libsyntax/ext/deriving/show.rs
index 4b9925c8d9f3e..51399d8efabe9 100644
--- a/src/libsyntax/ext/deriving/show.rs
+++ b/src/libsyntax/ext/deriving/show.rs
@@ -19,6 +19,7 @@ use ext::deriving::generic::*;
 use parse::token;
 
 use collections::HashMap;
+use std::vec_ng::Vec;
 
 pub fn expand_deriving_show(cx: &mut ExtCtxt,
                             span: Span,
@@ -26,27 +27,27 @@ pub fn expand_deriving_show(cx: &mut ExtCtxt,
                             item: @Item,
                             push: |@Item|) {
     // &mut ::std::fmt::Formatter
-    let fmtr = Ptr(~Literal(Path::new(~["std", "fmt", "Formatter"])),
+    let fmtr = Ptr(~Literal(Path::new(vec!("std", "fmt", "Formatter"))),
                    Borrowed(None, ast::MutMutable));
 
     let trait_def = TraitDef {
         span: span,
-        attributes: ~[],
-        path: Path::new(~["std", "fmt", "Show"]),
-        additional_bounds: ~[],
+        attributes: Vec::new(),
+        path: Path::new(vec!("std", "fmt", "Show")),
+        additional_bounds: Vec::new(),
         generics: LifetimeBounds::empty(),
-        methods: ~[
+        methods: vec!(
             MethodDef {
                 name: "fmt",
                 generics: LifetimeBounds::empty(),
                 explicit_self: borrowed_explicit_self(),
-                args: ~[fmtr],
-                ret_ty: Literal(Path::new(~["std", "fmt", "Result"])),
+                args: vec!(fmtr),
+                ret_ty: Literal(Path::new(vec!("std", "fmt", "Result"))),
                 inline: false,
                 const_nonmatching: false,
                 combine_substructure: show_substructure
             }
-        ]
+        )
     };
     trait_def.expand(cx, mitem, item, push)
 }
@@ -70,7 +71,7 @@ fn show_substructure(cx: &mut ExtCtxt, span: Span,
 
     let mut format_string = token::get_ident(name).get().to_owned();
     // the internal fields we're actually formatting
-    let mut exprs = ~[];
+    let mut exprs = Vec::new();
 
     // Getting harder... making the format string:
     match *substr.fields {
@@ -79,7 +80,7 @@ fn show_substructure(cx: &mut ExtCtxt, span: Span,
         EnumMatching(_, _, ref fields) if fields.len() == 0 => {}
 
         Struct(ref fields) | EnumMatching(_, _, ref fields) => {
-            if fields[0].name.is_none() {
+            if fields.get(0).name.is_none() {
                 // tuple struct/"normal" variant
 
                 format_string.push_str("(");
@@ -124,10 +125,10 @@ fn show_substructure(cx: &mut ExtCtxt, span: Span,
     let formatter = substr.nonself_args[0];
     let buf = cx.expr_field_access(span, formatter, cx.ident_of("buf"));
 
-    let std_write = ~[cx.ident_of("std"), cx.ident_of("fmt"), cx.ident_of("write")];
+    let std_write = vec!(cx.ident_of("std"), cx.ident_of("fmt"), cx.ident_of("write"));
     let args = cx.ident_of("__args");
-    let write_call = cx.expr_call_global(span, std_write, ~[buf, cx.expr_ident(span, args)]);
-    let format_closure = cx.lambda_expr(span, ~[args], write_call);
+    let write_call = cx.expr_call_global(span, std_write, vec!(buf, cx.expr_ident(span, args)));
+    let format_closure = cx.lambda_expr(span, vec!(args), write_call);
 
     let s = token::intern_and_get_ident(format_string);
     let format_string = cx.expr_str(span, s);
@@ -135,6 +136,6 @@ fn show_substructure(cx: &mut ExtCtxt, span: Span,
     // phew, not our responsibility any more!
     format::expand_preparsed_format_args(cx, span,
                                          format_closure,
-                                         format_string, exprs, ~[],
+                                         format_string, exprs, Vec::new(),
                                          HashMap::new())
 }
diff --git a/src/libsyntax/ext/deriving/ty.rs b/src/libsyntax/ext/deriving/ty.rs
index 1d3dd9185caae..b88cd117911c7 100644
--- a/src/libsyntax/ext/deriving/ty.rs
+++ b/src/libsyntax/ext/deriving/ty.rs
@@ -21,6 +21,8 @@ use codemap::{Span,respan};
 use opt_vec;
 use opt_vec::OptVec;
 
+use std::vec_ng::Vec;
+
 /// The types of pointers
 pub enum PtrTy<'a> {
     Send, // ~
@@ -30,22 +32,22 @@ pub enum PtrTy<'a> {
 /// A path, e.g. `::std::option::Option::<int>` (global). Has support
 /// for type parameters and a lifetime.
 pub struct Path<'a> {
-    path: ~[&'a str],
+    path: Vec<&'a str> ,
     lifetime: Option<&'a str>,
-    params: ~[~Ty<'a>],
+    params: Vec<~Ty<'a>> ,
     global: bool
 }
 
 impl<'a> Path<'a> {
-    pub fn new<'r>(path: ~[&'r str]) -> Path<'r> {
-        Path::new_(path, None, ~[], true)
+    pub fn new<'r>(path: Vec<&'r str> ) -> Path<'r> {
+        Path::new_(path, None, Vec::new(), true)
     }
     pub fn new_local<'r>(path: &'r str) -> Path<'r> {
-        Path::new_(~[ path ], None, ~[], false)
+        Path::new_(vec!( path ), None, Vec::new(), false)
     }
-    pub fn new_<'r>(path: ~[&'r str],
+    pub fn new_<'r>(path: Vec<&'r str> ,
                     lifetime: Option<&'r str>,
-                    params: ~[~Ty<'r>],
+                    params: Vec<~Ty<'r>> ,
                     global: bool)
                     -> Path<'r> {
         Path {
@@ -87,7 +89,7 @@ pub enum Ty<'a> {
     // parameter, and things like `int`
     Literal(Path<'a>),
     // includes nil
-    Tuple(~[Ty<'a>])
+    Tuple(Vec<Ty<'a>> )
 }
 
 pub fn borrowed_ptrty<'r>() -> PtrTy<'r> {
@@ -106,7 +108,7 @@ pub fn borrowed_self<'r>() -> Ty<'r> {
 }
 
 pub fn nil_ty() -> Ty<'static> {
-    Tuple(~[])
+    Tuple(Vec::new())
 }
 
 fn mk_lifetime(cx: &ExtCtxt, span: Span, lt: &Option<&str>) -> Option<ast::Lifetime> {
@@ -172,7 +174,7 @@ impl<'a> Ty<'a> {
                 });
                 let lifetimes = self_generics.lifetimes.clone();
 
-                cx.path_all(span, false, ~[self_ty], lifetimes,
+                cx.path_all(span, false, vec!(self_ty), lifetimes,
                             opt_vec::take_vec(self_params))
             }
             Literal(ref p) => {
@@ -188,14 +190,14 @@ impl<'a> Ty<'a> {
 fn mk_ty_param(cx: &ExtCtxt, span: Span, name: &str, bounds: &[Path],
                self_ident: Ident, self_generics: &Generics) -> ast::TyParam {
     let bounds = opt_vec::from(
-        bounds.map(|b| {
+        bounds.iter().map(|b| {
             let path = b.to_path(cx, span, self_ident, self_generics);
             cx.typarambound(path)
-        }));
+        }).collect());
     cx.typaram(cx.ident_of(name), bounds, None)
 }
 
-fn mk_generics(lifetimes: ~[ast::Lifetime],  ty_params: ~[ast::TyParam]) -> Generics {
+fn mk_generics(lifetimes: Vec<ast::Lifetime> ,  ty_params: Vec<ast::TyParam> ) -> Generics {
     Generics {
         lifetimes: opt_vec::from(lifetimes),
         ty_params: opt_vec::from(ty_params)
@@ -204,14 +206,14 @@ fn mk_generics(lifetimes: ~[ast::Lifetime],  ty_params: ~[ast::TyParam]) -> Gene
 
 /// Lifetimes and bounds on type parameters
 pub struct LifetimeBounds<'a> {
-    lifetimes: ~[&'a str],
-    bounds: ~[(&'a str, ~[Path<'a>])]
+    lifetimes: Vec<&'a str>,
+    bounds: Vec<(&'a str, Vec<Path<'a>>)>,
 }
 
 impl<'a> LifetimeBounds<'a> {
     pub fn empty() -> LifetimeBounds<'static> {
         LifetimeBounds {
-            lifetimes: ~[], bounds: ~[]
+            lifetimes: Vec::new(), bounds: Vec::new()
         }
     }
     pub fn to_generics(&self,
@@ -226,7 +228,12 @@ impl<'a> LifetimeBounds<'a> {
         let ty_params = self.bounds.map(|t| {
             match t {
                 &(ref name, ref bounds) => {
-                    mk_ty_param(cx, span, *name, *bounds, self_ty, self_generics)
+                    mk_ty_param(cx,
+                                span,
+                                *name,
+                                bounds.as_slice(),
+                                self_ty,
+                                self_generics)
                 }
             }
         });
diff --git a/src/libsyntax/ext/deriving/zero.rs b/src/libsyntax/ext/deriving/zero.rs
index 90f4fa0eb5897..98c0ec9d07238 100644
--- a/src/libsyntax/ext/deriving/zero.rs
+++ b/src/libsyntax/ext/deriving/zero.rs
@@ -14,6 +14,8 @@ use ext::base::ExtCtxt;
 use ext::build::AstBuilder;
 use ext::deriving::generic::*;
 
+use std::vec_ng::Vec;
+
 pub fn expand_deriving_zero(cx: &mut ExtCtxt,
                             span: Span,
                             mitem: @MetaItem,
@@ -21,16 +23,16 @@ pub fn expand_deriving_zero(cx: &mut ExtCtxt,
                             push: |@Item|) {
     let trait_def = TraitDef {
         span: span,
-        attributes: ~[],
-        path: Path::new(~["std", "num", "Zero"]),
-        additional_bounds: ~[],
+        attributes: Vec::new(),
+        path: Path::new(vec!("std", "num", "Zero")),
+        additional_bounds: Vec::new(),
         generics: LifetimeBounds::empty(),
-        methods: ~[
+        methods: vec!(
             MethodDef {
                 name: "zero",
                 generics: LifetimeBounds::empty(),
                 explicit_self: None,
-                args: ~[],
+                args: Vec::new(),
                 ret_ty: Self,
                 inline: true,
                 const_nonmatching: false,
@@ -40,8 +42,8 @@ pub fn expand_deriving_zero(cx: &mut ExtCtxt,
                 name: "is_zero",
                 generics: LifetimeBounds::empty(),
                 explicit_self: borrowed_explicit_self(),
-                args: ~[],
-                ret_ty: Literal(Path::new(~["bool"])),
+                args: Vec::new(),
+                ret_ty: Literal(Path::new(vec!("bool"))),
                 inline: true,
                 const_nonmatching: false,
                 combine_substructure: |cx, span, substr| {
@@ -52,19 +54,19 @@ pub fn expand_deriving_zero(cx: &mut ExtCtxt,
                            cx, span, substr)
                 }
             }
-        ]
+        )
     };
     trait_def.expand(cx, mitem, item, push)
 }
 
 fn zero_substructure(cx: &mut ExtCtxt, trait_span: Span, substr: &Substructure) -> @Expr {
-    let zero_ident = ~[
+    let zero_ident = vec!(
         cx.ident_of("std"),
         cx.ident_of("num"),
         cx.ident_of("Zero"),
         cx.ident_of("zero")
-    ];
-    let zero_call = |span| cx.expr_call_global(span, zero_ident.clone(), ~[]);
+    );
+    let zero_call = |span| cx.expr_call_global(span, zero_ident.clone(), Vec::new());
 
     return match *substr.fields {
         StaticStruct(_, ref summary) => {
diff --git a/src/libsyntax/ext/env.rs b/src/libsyntax/ext/env.rs
index aacb2a7408738..b0b5fa26015cc 100644
--- a/src/libsyntax/ext/env.rs
+++ b/src/libsyntax/ext/env.rs
@@ -19,6 +19,7 @@ use codemap::Span;
 use ext::base::*;
 use ext::base;
 use ext::build::AstBuilder;
+use opt_vec;
 use parse::token;
 
 use std::os;
@@ -31,8 +32,30 @@ pub fn expand_option_env(cx: &mut ExtCtxt, sp: Span, tts: &[ast::TokenTree])
     };
 
     let e = match os::getenv(var) {
-      None => quote_expr!(cx, ::std::option::None::<&'static str>),
-      Some(s) => quote_expr!(cx, ::std::option::Some($s))
+      None => {
+          cx.expr_path(cx.path_all(sp,
+                                   true,
+                                   vec!(cx.ident_of("std"),
+                                        cx.ident_of("option"),
+                                        cx.ident_of("None")),
+                                   opt_vec::Empty,
+                                   vec!(cx.ty_rptr(sp,
+                                                   cx.ty_ident(sp,
+                                                        cx.ident_of("str")),
+                                                   Some(cx.lifetime(sp,
+                                                        cx.ident_of(
+                                                            "static").name)),
+                                                   ast::MutImmutable))))
+      }
+      Some(s) => {
+          cx.expr_call_global(sp,
+                              vec!(cx.ident_of("std"),
+                                   cx.ident_of("option"),
+                                   cx.ident_of("Some")),
+                              vec!(cx.expr_str(sp,
+                                               token::intern_and_get_ident(
+                                          s))))
+      }
     };
     MRExpr(e)
 }
@@ -48,7 +71,9 @@ pub fn expand_env(cx: &mut ExtCtxt, sp: Span, tts: &[ast::TokenTree])
         Some(exprs) => exprs
     };
 
-    let var = match expr_to_str(cx, exprs[0], "expected string literal") {
+    let var = match expr_to_str(cx,
+                                *exprs.get(0),
+                                "expected string literal") {
         None => return MacResult::dummy_expr(sp),
         Some((v, _style)) => v
     };
@@ -59,7 +84,7 @@ pub fn expand_env(cx: &mut ExtCtxt, sp: Span, tts: &[ast::TokenTree])
                                                 var))
         }
         2 => {
-            match expr_to_str(cx, exprs[1], "expected string literal") {
+            match expr_to_str(cx, *exprs.get(1), "expected string literal") {
                 None => return MacResult::dummy_expr(sp),
                 Some((s, _style)) => s
             }
diff --git a/src/libsyntax/ext/expand.rs b/src/libsyntax/ext/expand.rs
index b49f9fb3a384d..b162e17f53de1 100644
--- a/src/libsyntax/ext/expand.rs
+++ b/src/libsyntax/ext/expand.rs
@@ -31,6 +31,7 @@ use util::small_vector::SmallVector;
 use std::cast;
 use std::unstable::dynamic_lib::DynamicLibrary;
 use std::os;
+use std::vec_ng::Vec;
 
 pub fn expand_expr(e: @ast::Expr, fld: &mut MacroExpander) -> @ast::Expr {
     match e.node {
@@ -53,7 +54,7 @@ pub fn expand_expr(e: @ast::Expr, fld: &mut MacroExpander) -> @ast::Expr {
                         // let compilation continue
                         return MacResult::raw_dummy_expr(e.span);
                     }
-                    let extname = pth.segments[0].identifier;
+                    let extname = pth.segments.get(0).identifier;
                     let extnamestr = token::get_ident(extname);
                     // leaving explicit deref here to highlight unbox op:
                     let marked_after = match fld.extsbox.find(&extname.name) {
@@ -77,7 +78,7 @@ pub fn expand_expr(e: @ast::Expr, fld: &mut MacroExpander) -> @ast::Expr {
                             });
                             let fm = fresh_mark();
                             // mark before:
-                            let marked_before = mark_tts(*tts,fm);
+                            let marked_before = mark_tts(tts.as_slice(), fm);
 
                             // The span that we pass to the expanders we want to
                             // be the root of the call stack. That's the most
@@ -87,7 +88,7 @@ pub fn expand_expr(e: @ast::Expr, fld: &mut MacroExpander) -> @ast::Expr {
 
                             let expanded = match expandfun.expand(fld.cx,
                                                    mac_span.call_site,
-                                                   marked_before) {
+                                                   marked_before.as_slice()) {
                                 MRExpr(e) => e,
                                 MRAny(any_macro) => any_macro.make_expr(),
                                 _ => {
@@ -169,21 +170,24 @@ pub fn expand_expr(e: @ast::Expr, fld: &mut MacroExpander) -> @ast::Expr {
             let none_arm = {
                 let break_expr = fld.cx.expr(span, ast::ExprBreak(opt_ident));
                 let none_pat = fld.cx.pat_ident(span, none_ident);
-                fld.cx.arm(span, ~[none_pat], break_expr)
+                fld.cx.arm(span, vec!(none_pat), break_expr)
             };
 
             // `Some(<src_pat>) => <src_loop_block>`
             let some_arm =
                 fld.cx.arm(span,
-                           ~[fld.cx.pat_enum(span, some_path, ~[src_pat])],
+                           vec!(fld.cx.pat_enum(span, some_path, vec!(src_pat))),
                            fld.cx.expr_block(src_loop_block));
 
             // `match i.next() { ... }`
             let match_expr = {
                 let next_call_expr =
-                    fld.cx.expr_method_call(span, fld.cx.expr_path(local_path), next_ident, ~[]);
+                    fld.cx.expr_method_call(span,
+                                            fld.cx.expr_path(local_path),
+                                            next_ident,
+                                            Vec::new());
 
-                fld.cx.expr_match(span, next_call_expr, ~[none_arm, some_arm])
+                fld.cx.expr_match(span, next_call_expr, vec!(none_arm, some_arm))
             };
 
             // ['ident:] loop { ... }
@@ -196,8 +200,8 @@ pub fn expand_expr(e: @ast::Expr, fld: &mut MacroExpander) -> @ast::Expr {
             // `match &mut <src_expr> { i => loop { ... } }`
             let discrim = fld.cx.expr_mut_addr_of(span, src_expr);
             let i_pattern = fld.cx.pat_ident(span, local_ident);
-            let arm = fld.cx.arm(span, ~[i_pattern], loop_expr);
-            fld.cx.expr_match(span, discrim, ~[arm])
+            let arm = fld.cx.arm(span, vec!(i_pattern), loop_expr);
+            fld.cx.expr_match(span, discrim, vec!(arm))
         }
 
         ast::ExprLoop(loop_block, opt_ident) => {
@@ -221,7 +225,7 @@ fn rename_loop_label(opt_ident: Option<Ident>,
             let new_label = fresh_name(&label);
             let rename = (label, new_label);
             fld.extsbox.info().pending_renames.push(rename);
-            let mut pending_renames = ~[rename];
+            let mut pending_renames = vec!(rename);
             let mut rename_fld = renames_to_fold(&mut pending_renames);
             (Some(rename_fld.fold_ident(label)),
              rename_fld.fold_block(loop_block))
@@ -276,7 +280,7 @@ pub fn expand_item(it: @ast::Item, fld: &mut MacroExpander)
         ast::ItemMac(..) => expand_item_mac(it, fld),
         ast::ItemMod(_) | ast::ItemForeignMod(_) => {
             fld.cx.mod_push(it.ident);
-            let macro_escape = contains_macro_escape(it.attrs);
+            let macro_escape = contains_macro_escape(it.attrs.as_slice());
             let result = with_exts_frame!(fld.extsbox,
                                           macro_escape,
                                           noop_fold_item(it, fld));
@@ -309,7 +313,7 @@ pub fn expand_item_mac(it: @ast::Item, fld: &mut MacroExpander)
         _ => fld.cx.span_bug(it.span, "invalid item macro invocation")
     };
 
-    let extname = pth.segments[0].identifier;
+    let extname = pth.segments.get(0).identifier;
     let extnamestr = token::get_ident(extname);
     let fm = fresh_mark();
     let expanded = match fld.extsbox.find(&extname.name) {
@@ -339,8 +343,8 @@ pub fn expand_item_mac(it: @ast::Item, fld: &mut MacroExpander)
                 }
             });
             // mark before expansion:
-            let marked_before = mark_tts(tts,fm);
-            expander.expand(fld.cx, it.span, marked_before)
+            let marked_before = mark_tts(tts.as_slice(), fm);
+            expander.expand(fld.cx, it.span, marked_before.as_slice())
         }
         Some(&IdentTT(ref expander, span)) => {
             if it.ident.name == parse::token::special_idents::invalid.name {
@@ -358,7 +362,7 @@ pub fn expand_item_mac(it: @ast::Item, fld: &mut MacroExpander)
                 }
             });
             // mark before expansion:
-            let marked_tts = mark_tts(tts,fm);
+            let marked_tts = mark_tts(tts.as_slice(), fm);
             expander.expand(fld.cx, it.span, it.ident, marked_tts)
         }
         _ => {
@@ -391,7 +395,7 @@ pub fn expand_item_mac(it: @ast::Item, fld: &mut MacroExpander)
             // yikes... no idea how to apply the mark to this. I'm afraid
             // we're going to have to wait-and-see on this one.
             fld.extsbox.insert(intern(name), ext);
-            if attr::contains_name(it.attrs, "macro_export") {
+            if attr::contains_name(it.attrs.as_slice(), "macro_export") {
                 SmallVector::one(it)
             } else {
                 SmallVector::zero()
@@ -504,7 +508,7 @@ pub fn expand_stmt(s: &Stmt, fld: &mut MacroExpander) -> SmallVector<@Stmt> {
         fld.cx.span_err(pth.span, "expected macro name without module separators");
         return SmallVector::zero();
     }
-    let extname = pth.segments[0].identifier;
+    let extname = pth.segments.get(0).identifier;
     let extnamestr = token::get_ident(extname);
     let marked_after = match fld.extsbox.find(&extname.name) {
         None => {
@@ -523,7 +527,7 @@ pub fn expand_stmt(s: &Stmt, fld: &mut MacroExpander) -> SmallVector<@Stmt> {
             });
             let fm = fresh_mark();
             // mark before expansion:
-            let marked_tts = mark_tts(tts,fm);
+            let marked_tts = mark_tts(tts.as_slice(), fm);
 
             // See the comment in expand_expr for why we want the original span,
             // not the current mac.span.
@@ -531,7 +535,7 @@ pub fn expand_stmt(s: &Stmt, fld: &mut MacroExpander) -> SmallVector<@Stmt> {
 
             let expanded = match expandfun.expand(fld.cx,
                                                   mac_span.call_site,
-                                                  marked_tts) {
+                                                  marked_tts.as_slice()) {
                 MRExpr(e) => {
                     @codemap::Spanned {
                         node: StmtExpr(e, ast::DUMMY_NODE_ID),
@@ -607,10 +611,10 @@ fn expand_non_macro_stmt(s: &Stmt, fld: &mut MacroExpander)
                     // oh dear heaven... this is going to include the enum
                     // names, as well... but that should be okay, as long as
                     // the new names are gensyms for the old ones.
-                    let mut name_finder = new_name_finder(~[]);
+                    let mut name_finder = new_name_finder(Vec::new());
                     name_finder.visit_pat(expanded_pat,());
                     // generate fresh names, push them to a new pending list
-                    let mut new_pending_renames = ~[];
+                    let mut new_pending_renames = Vec::new();
                     for ident in name_finder.ident_accumulator.iter() {
                         let new_name = fresh_name(ident);
                         new_pending_renames.push((*ident,new_name));
@@ -657,7 +661,7 @@ fn expand_non_macro_stmt(s: &Stmt, fld: &mut MacroExpander)
 // array (passed in to the traversal)
 #[deriving(Clone)]
 struct NewNameFinderContext {
-    ident_accumulator: ~[ast::Ident],
+    ident_accumulator: Vec<ast::Ident> ,
 }
 
 impl Visitor<()> for NewNameFinderContext {
@@ -676,7 +680,8 @@ impl Visitor<()> for NewNameFinderContext {
                         span: _,
                         segments: ref segments
                     } if segments.len() == 1 => {
-                        self.ident_accumulator.push(segments[0].identifier)
+                        self.ident_accumulator.push(segments.get(0)
+                                                            .identifier)
                     }
                     // I believe these must be enums...
                     _ => ()
@@ -700,7 +705,7 @@ impl Visitor<()> for NewNameFinderContext {
 // return a visitor that extracts the pat_ident paths
 // from a given thingy and puts them in a mutable
 // array (passed in to the traversal)
-pub fn new_name_finder(idents: ~[ast::Ident]) -> NewNameFinderContext {
+pub fn new_name_finder(idents: Vec<ast::Ident> ) -> NewNameFinderContext {
     NewNameFinderContext {
         ident_accumulator: idents,
     }
@@ -843,7 +848,7 @@ impl Folder for Marker {
         let macro = match m.node {
             MacInvocTT(ref path, ref tts, ctxt) => {
                 MacInvocTT(self.fold_path(path),
-                           fold_tts(*tts, self),
+                           fold_tts(tts.as_slice(), self),
                            new_mark(self.mark, ctxt))
             }
         };
@@ -860,7 +865,7 @@ fn new_mark_folder(m: Mrk) -> Marker {
 }
 
 // apply a given mark to the given token trees. Used prior to expansion of a macro.
-fn mark_tts(tts: &[TokenTree], m: Mrk) -> ~[TokenTree] {
+fn mark_tts(tts: &[TokenTree], m: Mrk) -> Vec<TokenTree> {
     fold_tts(tts, &mut new_mark_folder(m))
 }
 
@@ -912,12 +917,14 @@ mod test {
     use visit;
     use visit::Visitor;
 
+    use std::vec_ng::Vec;
+
     // a visitor that extracts the paths
     // from a given thingy and puts them in a mutable
     // array (passed in to the traversal)
     #[deriving(Clone)]
     struct NewPathExprFinderContext {
-        path_accumulator: ~[ast::Path],
+        path_accumulator: Vec<ast::Path> ,
     }
 
     impl Visitor<()> for NewPathExprFinderContext {
@@ -941,7 +948,7 @@ mod test {
     // return a visitor that extracts the paths
     // from a given pattern and puts them in a mutable
     // array (passed in to the traversal)
-    pub fn new_path_finder(paths: ~[ast::Path]) -> NewPathExprFinderContext {
+    pub fn new_path_finder(paths: Vec<ast::Path> ) -> NewPathExprFinderContext {
         NewPathExprFinderContext {
             path_accumulator: paths
         }
@@ -954,7 +961,7 @@ mod test {
             fail!("lolwut")
         }
 
-        fn get_exported_macros(&mut self, _: ast::CrateNum) -> ~[~str] {
+        fn get_exported_macros(&mut self, _: ast::CrateNum) -> Vec<~str> {
             fail!("lolwut")
         }
 
@@ -975,7 +982,7 @@ mod test {
         let crate_ast = parse::parse_crate_from_source_str(
             ~"<test>",
             src,
-            ~[],sess);
+            Vec::new(),sess);
         // should fail:
         let mut loader = ErrLoader;
         expand_crate(sess,&mut loader,crate_ast);
@@ -990,7 +997,7 @@ mod test {
         let crate_ast = parse::parse_crate_from_source_str(
             ~"<test>",
             src,
-            ~[],sess);
+            Vec::new(),sess);
         // should fail:
         let mut loader = ErrLoader;
         expand_crate(sess,&mut loader,crate_ast);
@@ -1004,7 +1011,7 @@ mod test {
         let crate_ast = parse::parse_crate_from_source_str(
             ~"<test>",
             src,
-            ~[], sess);
+            Vec::new(), sess);
         // should fail:
         let mut loader = ErrLoader;
         expand_crate(sess, &mut loader, crate_ast);
@@ -1014,10 +1021,10 @@ mod test {
         let attr1 = make_dummy_attr ("foo");
         let attr2 = make_dummy_attr ("bar");
         let escape_attr = make_dummy_attr ("macro_escape");
-        let attrs1 = ~[attr1, escape_attr, attr2];
-        assert_eq!(contains_macro_escape (attrs1),true);
-        let attrs2 = ~[attr1,attr2];
-        assert_eq!(contains_macro_escape (attrs2),false);
+        let attrs1 = vec!(attr1, escape_attr, attr2);
+        assert_eq!(contains_macro_escape(attrs1.as_slice()),true);
+        let attrs2 = vec!(attr1,attr2);
+        assert_eq!(contains_macro_escape(attrs2.as_slice()),false);
     }
 
     // make a MetaWord outer attribute with the given name
@@ -1082,48 +1089,30 @@ mod test {
     // in principle, you might want to control this boolean on a per-varref basis,
     // but that would make things even harder to understand, and might not be
     // necessary for thorough testing.
-    type RenamingTest = (&'static str, ~[~[uint]], bool);
+    type RenamingTest = (&'static str, Vec<Vec<uint>>, bool);
 
     #[test]
     fn automatic_renaming () {
-        let tests: ~[RenamingTest] =
-            ~[// b & c should get new names throughout, in the expr too:
+        let tests: Vec<RenamingTest> =
+            vec!(// b & c should get new names throughout, in the expr too:
                 ("fn a() -> int { let b = 13; let c = b; b+c }",
-                 ~[~[0,1],~[2]], false),
+                 vec!(vec!(0,1),vec!(2)), false),
                 // both x's should be renamed (how is this causing a bug?)
                 ("fn main () {let x: int = 13;x;}",
-                 ~[~[0]], false),
+                 vec!(vec!(0)), false),
                 // the use of b after the + should be renamed, the other one not:
                 ("macro_rules! f (($x:ident) => (b + $x)) fn a() -> int { let b = 13; f!(b)}",
-                 ~[~[1]], false),
+                 vec!(vec!(1)), false),
                 // the b before the plus should not be renamed (requires marks)
                 ("macro_rules! f (($x:ident) => ({let b=9; ($x + b)})) fn a() -> int { f!(b)}",
-                 ~[~[1]], false),
+                 vec!(vec!(1)), false),
                 // the marks going in and out of letty should cancel, allowing that $x to
                 // capture the one following the semicolon.
                 // this was an awesome test case, and caught a *lot* of bugs.
                 ("macro_rules! letty(($x:ident) => (let $x = 15;))
                   macro_rules! user(($x:ident) => ({letty!($x); $x}))
                   fn main() -> int {user!(z)}",
-                 ~[~[0]], false),
-                // no longer a fixme #8062: this test exposes a *potential* bug; our system does
-                // not behave exactly like MTWT, but a conversation with Matthew Flatt
-                // suggests that this can only occur in the presence of local-expand, which
-                // we have no plans to support.
-                // ("fn main() {let hrcoo = 19; macro_rules! getx(()=>(hrcoo)); getx!();}",
-                // ~[~[0]], true)
-                // FIXME #6994: the next string exposes the bug referred to in issue 6994, so I'm
-                // commenting it out.
-                // the z flows into and out of two macros (g & f) along one path, and one
-                // (just g) along the other, so the result of the whole thing should
-                // be "let z_123 = 3; z_123"
-                //"macro_rules! g (($x:ident) =>
-                //   ({macro_rules! f(($y:ident)=>({let $y=3;$x}));f!($x)}))
-                //   fn a(){g!(z)}"
-                // create a really evil test case where a $x appears inside a binding of $x
-                // but *shouldnt* bind because it was inserted by a different macro....
-                // can't write this test case until we have macro-generating macros.
-            ];
+                 vec!(vec!(0)), false));
         for (idx,s) in tests.iter().enumerate() {
             run_renaming_test(s,idx);
         }
@@ -1137,20 +1126,20 @@ mod test {
         };
         let cr = expand_crate_str(teststr.to_owned());
         // find the bindings:
-        let mut name_finder = new_name_finder(~[]);
+        let mut name_finder = new_name_finder(Vec::new());
         visit::walk_crate(&mut name_finder,&cr,());
         let bindings = name_finder.ident_accumulator;
 
         // find the varrefs:
-        let mut path_finder = new_path_finder(~[]);
+        let mut path_finder = new_path_finder(Vec::new());
         visit::walk_crate(&mut path_finder,&cr,());
         let varrefs = path_finder.path_accumulator;
 
         // must be one check clause for each binding:
         assert_eq!(bindings.len(),bound_connections.len());
         for (binding_idx,shouldmatch) in bound_connections.iter().enumerate() {
-            let binding_name = mtwt_resolve(bindings[binding_idx]);
-            let binding_marks = mtwt_marksof(bindings[binding_idx].ctxt,invalid_name);
+            let binding_name = mtwt_resolve(*bindings.get(binding_idx));
+            let binding_marks = mtwt_marksof(bindings.get(binding_idx).ctxt,invalid_name);
             // shouldmatch can't name varrefs that don't exist:
             assert!((shouldmatch.len() == 0) ||
                     (varrefs.len() > *shouldmatch.iter().max().unwrap()));
@@ -1159,13 +1148,18 @@ mod test {
                     // it should be a path of length 1, and it should
                     // be free-identifier=? or bound-identifier=? to the given binding
                     assert_eq!(varref.segments.len(),1);
-                    let varref_name = mtwt_resolve(varref.segments[0].identifier);
-                    let varref_marks = mtwt_marksof(varref.segments[0].identifier.ctxt,
+                    let varref_name = mtwt_resolve(varref.segments
+                                                         .get(0)
+                                                         .identifier);
+                    let varref_marks = mtwt_marksof(varref.segments
+                                                          .get(0)
+                                                          .identifier
+                                                          .ctxt,
                                                     invalid_name);
                     if !(varref_name==binding_name) {
                         println!("uh oh, should match but doesn't:");
                         println!("varref: {:?}",varref);
-                        println!("binding: {:?}", bindings[binding_idx]);
+                        println!("binding: {:?}", *bindings.get(binding_idx));
                         ast_util::display_sctable(get_sctable());
                     }
                     assert_eq!(varref_name,binding_name);
@@ -1176,7 +1170,8 @@ mod test {
                     }
                 } else {
                     let fail = (varref.segments.len() == 1)
-                        && (mtwt_resolve(varref.segments[0].identifier) == binding_name);
+                        && (mtwt_resolve(varref.segments.get(0).identifier) ==
+                                         binding_name);
                     // temp debugging:
                     if fail {
                         println!("failure on test {}",test_idx);
@@ -1185,11 +1180,13 @@ mod test {
                         println!("uh oh, matches but shouldn't:");
                         println!("varref: {:?}",varref);
                         // good lord, you can't make a path with 0 segments, can you?
-                        let string = token::get_ident(varref.segments[0].identifier);
+                        let string = token::get_ident(varref.segments
+                                                            .get(0)
+                                                            .identifier);
                         println!("varref's first segment's uint: {}, and string: \"{}\"",
-                                 varref.segments[0].identifier.name,
+                                 varref.segments.get(0).identifier.name,
                                  string.get());
-                        println!("binding: {:?}", bindings[binding_idx]);
+                        println!("binding: {:?}", *bindings.get(binding_idx));
                         ast_util::display_sctable(get_sctable());
                     }
                     assert!(!fail);
@@ -1205,40 +1202,41 @@ foo_module!()
 ";
         let cr = expand_crate_str(crate_str);
         // find the xx binding
-        let mut name_finder = new_name_finder(~[]);
+        let mut name_finder = new_name_finder(Vec::new());
         visit::walk_crate(&mut name_finder, &cr, ());
         let bindings = name_finder.ident_accumulator;
 
-        let cxbinds: ~[&ast::Ident] =
+        let cxbinds: Vec<&ast::Ident> =
             bindings.iter().filter(|b| {
                 let ident = token::get_ident(**b);
                 let string = ident.get();
                 "xx" == string
             }).collect();
-        let cxbinds: &[&ast::Ident] = cxbinds;
+        let cxbinds: &[&ast::Ident] = cxbinds.as_slice();
         let cxbind = match cxbinds {
             [b] => b,
             _ => fail!("expected just one binding for ext_cx")
         };
         let resolved_binding = mtwt_resolve(*cxbind);
         // find all the xx varrefs:
-        let mut path_finder = new_path_finder(~[]);
+        let mut path_finder = new_path_finder(Vec::new());
         visit::walk_crate(&mut path_finder, &cr, ());
         let varrefs = path_finder.path_accumulator;
 
         // the xx binding should bind all of the xx varrefs:
         for (idx,v) in varrefs.iter().filter(|p| {
             p.segments.len() == 1
-            && "xx" == token::get_ident(p.segments[0].identifier).get()
+            && "xx" == token::get_ident(p.segments.get(0).identifier).get()
         }).enumerate() {
-            if mtwt_resolve(v.segments[0].identifier) != resolved_binding {
+            if mtwt_resolve(v.segments.get(0).identifier) !=
+                    resolved_binding {
                 println!("uh oh, xx binding didn't match xx varref:");
                 println!("this is xx varref \\# {:?}",idx);
                 println!("binding: {:?}",cxbind);
                 println!("resolves to: {:?}",resolved_binding);
-                println!("varref: {:?}",v.segments[0].identifier);
+                println!("varref: {:?}",v.segments.get(0).identifier);
                 println!("resolves to: {:?}",
-                         mtwt_resolve(v.segments[0].identifier));
+                         mtwt_resolve(v.segments.get(0).identifier));
                 let table = get_sctable();
                 println!("SC table:");
 
@@ -1249,17 +1247,18 @@ foo_module!()
                     }
                 }
             }
-            assert_eq!(mtwt_resolve(v.segments[0].identifier),resolved_binding);
+            assert_eq!(mtwt_resolve(v.segments.get(0).identifier),
+                       resolved_binding);
         };
     }
 
     #[test]
     fn pat_idents(){
         let pat = string_to_pat(~"(a,Foo{x:c @ (b,9),y:Bar(4,d)})");
-        let mut pat_idents = new_name_finder(~[]);
+        let mut pat_idents = new_name_finder(Vec::new());
         pat_idents.visit_pat(pat, ());
         assert_eq!(pat_idents.ident_accumulator,
-                   strs_to_idents(~["a","c","b","d"]));
+                   strs_to_idents(vec!("a","c","b","d")));
     }
 
 }
diff --git a/src/libsyntax/ext/format.rs b/src/libsyntax/ext/format.rs
index 2642ee00458c1..7752d88596820 100644
--- a/src/libsyntax/ext/format.rs
+++ b/src/libsyntax/ext/format.rs
@@ -22,6 +22,7 @@ use rsparse = parse;
 use std::fmt::parse;
 use collections::{HashMap, HashSet};
 use std::vec;
+use std::vec_ng::Vec;
 
 #[deriving(Eq)]
 enum ArgumentType {
@@ -41,20 +42,20 @@ struct Context<'a> {
 
     // Parsed argument expressions and the types that we've found so far for
     // them.
-    args: ~[@ast::Expr],
-    arg_types: ~[Option<ArgumentType>],
+    args: Vec<@ast::Expr>,
+    arg_types: Vec<Option<ArgumentType>>,
     // Parsed named expressions and the types that we've found for them so far.
     // Note that we keep a side-array of the ordering of the named arguments
     // found to be sure that we can translate them in the same order that they
     // were declared in.
     names: HashMap<~str, @ast::Expr>,
     name_types: HashMap<~str, ArgumentType>,
-    name_ordering: ~[~str],
+    name_ordering: Vec<~str>,
 
     // Collection of the compiled `rt::Piece` structures
-    pieces: ~[@ast::Expr],
+    pieces: Vec<@ast::Expr> ,
     name_positions: HashMap<~str, uint>,
-    method_statics: ~[@ast::Item],
+    method_statics: Vec<@ast::Item> ,
 
     // Updated as arguments are consumed or methods are entered
     nest_level: uint,
@@ -70,16 +71,17 @@ struct Context<'a> {
 ///     Some((fmtstr, unnamed arguments, ordering of named arguments,
 ///           named arguments))
 fn parse_args(ecx: &mut ExtCtxt, sp: Span, tts: &[ast::TokenTree])
-    -> (@ast::Expr, Option<(@ast::Expr, ~[@ast::Expr], ~[~str],
-                            HashMap<~str, @ast::Expr>)>)
-{
-    let mut args = ~[];
+    -> (@ast::Expr, Option<(@ast::Expr, Vec<@ast::Expr>, Vec<~str>,
+                            HashMap<~str, @ast::Expr>)>) {
+    let mut args = Vec::new();
     let mut names = HashMap::<~str, @ast::Expr>::new();
-    let mut order = ~[];
+    let mut order = Vec::new();
 
     let mut p = rsparse::new_parser_from_tts(ecx.parse_sess(),
                                              ecx.cfg(),
-                                             tts.to_owned());
+                                             tts.iter()
+                                                .map(|x| (*x).clone())
+                                                .collect());
     // Parse the leading function expression (maybe a block, maybe a path)
     let extra = p.parse_expr();
     if !p.eat(&token::COMMA) {
@@ -276,14 +278,14 @@ impl<'a> Context<'a> {
                     return;
                 }
                 {
-                    let arg_type = match self.arg_types[arg] {
-                        None => None,
-                        Some(ref x) => Some(x)
+                    let arg_type = match self.arg_types.get(arg) {
+                        &None => None,
+                        &Some(ref x) => Some(x)
                     };
-                    self.verify_same(self.args[arg].span, &ty, arg_type);
+                    self.verify_same(self.args.get(arg).span, &ty, arg_type);
                 }
-                if self.arg_types[arg].is_none() {
-                    self.arg_types[arg] = Some(ty);
+                if self.arg_types.get(arg).is_none() {
+                    *self.arg_types.get_mut(arg) = Some(ty);
                 }
             }
 
@@ -357,7 +359,7 @@ impl<'a> Context<'a> {
 
     /// These attributes are applied to all statics that this syntax extension
     /// will generate.
-    fn static_attrs(&self) -> ~[ast::Attribute] {
+    fn static_attrs(&self) -> Vec<ast::Attribute> {
         // Flag statics as `address_insignificant` so LLVM can merge duplicate
         // globals as much as possible (which we're generating a whole lot of).
         let unnamed = self.ecx
@@ -371,41 +373,41 @@ impl<'a> Context<'a> {
                                            InternedString::new("dead_code"));
         let allow_dead_code = self.ecx.meta_list(self.fmtsp,
                                                  InternedString::new("allow"),
-                                                 ~[dead_code]);
+                                                 vec!(dead_code));
         let allow_dead_code = self.ecx.attribute(self.fmtsp, allow_dead_code);
-        return ~[unnamed, allow_dead_code];
+        return vec!(unnamed, allow_dead_code);
     }
 
-    fn parsepath(&self, s: &str) -> ~[ast::Ident] {
-        ~[self.ecx.ident_of("std"), self.ecx.ident_of("fmt"),
-          self.ecx.ident_of("parse"), self.ecx.ident_of(s)]
+    fn parsepath(&self, s: &str) -> Vec<ast::Ident> {
+        vec!(self.ecx.ident_of("std"), self.ecx.ident_of("fmt"),
+          self.ecx.ident_of("parse"), self.ecx.ident_of(s))
     }
 
-    fn rtpath(&self, s: &str) -> ~[ast::Ident] {
-        ~[self.ecx.ident_of("std"), self.ecx.ident_of("fmt"),
-          self.ecx.ident_of("rt"), self.ecx.ident_of(s)]
+    fn rtpath(&self, s: &str) -> Vec<ast::Ident> {
+        vec!(self.ecx.ident_of("std"), self.ecx.ident_of("fmt"),
+          self.ecx.ident_of("rt"), self.ecx.ident_of(s))
     }
 
-    fn ctpath(&self, s: &str) -> ~[ast::Ident] {
-        ~[self.ecx.ident_of("std"), self.ecx.ident_of("fmt"),
-          self.ecx.ident_of("parse"), self.ecx.ident_of(s)]
+    fn ctpath(&self, s: &str) -> Vec<ast::Ident> {
+        vec!(self.ecx.ident_of("std"), self.ecx.ident_of("fmt"),
+          self.ecx.ident_of("parse"), self.ecx.ident_of(s))
     }
 
     fn none(&self) -> @ast::Expr {
-        let none = self.ecx.path_global(self.fmtsp, ~[
+        let none = self.ecx.path_global(self.fmtsp, vec!(
                 self.ecx.ident_of("std"),
                 self.ecx.ident_of("option"),
-                self.ecx.ident_of("None")]);
+                self.ecx.ident_of("None")));
         self.ecx.expr_path(none)
     }
 
     fn some(&self, e: @ast::Expr) -> @ast::Expr {
-        let p = self.ecx.path_global(self.fmtsp, ~[
+        let p = self.ecx.path_global(self.fmtsp, vec!(
                 self.ecx.ident_of("std"),
                 self.ecx.ident_of("option"),
-                self.ecx.ident_of("Some")]);
+                self.ecx.ident_of("Some")));
         let p = self.ecx.expr_path(p);
-        self.ecx.expr_call(self.fmtsp, p, ~[e])
+        self.ecx.expr_call(self.fmtsp, p, vec!(e))
     }
 
     fn trans_count(&self, c: parse::Count) -> @ast::Expr {
@@ -413,11 +415,11 @@ impl<'a> Context<'a> {
         match c {
             parse::CountIs(i) => {
                 self.ecx.expr_call_global(sp, self.rtpath("CountIs"),
-                                          ~[self.ecx.expr_uint(sp, i)])
+                                          vec!(self.ecx.expr_uint(sp, i)))
             }
             parse::CountIsParam(i) => {
                 self.ecx.expr_call_global(sp, self.rtpath("CountIsParam"),
-                                          ~[self.ecx.expr_uint(sp, i)])
+                                          vec!(self.ecx.expr_uint(sp, i)))
             }
             parse::CountImplied => {
                 let path = self.ecx.path_global(sp, self.rtpath("CountImplied"));
@@ -434,7 +436,7 @@ impl<'a> Context<'a> {
                 };
                 let i = i + self.args.len();
                 self.ecx.expr_call_global(sp, self.rtpath("CountIsParam"),
-                                          ~[self.ecx.expr_uint(sp, i)])
+                                          vec!(self.ecx.expr_uint(sp, i)))
             }
         }
     }
@@ -450,21 +452,19 @@ impl<'a> Context<'a> {
                         }).collect();
                         let s = token::intern_and_get_ident(arm.selector);
                         let selector = self.ecx.expr_str(sp, s);
-                        self.ecx.expr_struct(sp, p, ~[
+                        self.ecx.expr_struct(sp, p, vec!(
                                 self.ecx.field_imm(sp,
                                                    self.ecx.ident_of("selector"),
                                                    selector),
                                 self.ecx.field_imm(sp, self.ecx.ident_of("result"),
-                                                   self.ecx.expr_vec_slice(sp, result)),
-                                ])
+                                                   self.ecx.expr_vec_slice(sp, result))))
                     }).collect();
                 let default = default.iter().map(|p| {
                         self.trans_piece(p)
                     }).collect();
-                self.ecx.expr_call_global(sp, self.rtpath("Select"), ~[
+                self.ecx.expr_call_global(sp, self.rtpath("Select"), vec!(
                         self.ecx.expr_vec_slice(sp, arms),
-                        self.ecx.expr_vec_slice(sp, default),
-                        ])
+                        self.ecx.expr_vec_slice(sp, default)))
             }
             parse::Plural(offset, ref arms, ref default) => {
                 let offset = match offset {
@@ -487,23 +487,21 @@ impl<'a> Context<'a> {
                             }
                         };
                         let selector = self.ecx.expr_call_global(sp,
-                                                                 lr, ~[selarg]);
-                        self.ecx.expr_struct(sp, p, ~[
+                                                                 lr, vec!(selarg));
+                        self.ecx.expr_struct(sp, p, vec!(
                                 self.ecx.field_imm(sp,
                                                    self.ecx.ident_of("selector"),
                                                    selector),
                                 self.ecx.field_imm(sp, self.ecx.ident_of("result"),
-                                                   self.ecx.expr_vec_slice(sp, result)),
-                                ])
+                                                   self.ecx.expr_vec_slice(sp, result))))
                     }).collect();
                 let default = default.iter().map(|p| {
                         self.trans_piece(p)
                     }).collect();
-                self.ecx.expr_call_global(sp, self.rtpath("Plural"), ~[
+                self.ecx.expr_call_global(sp, self.rtpath("Plural"), vec!(
                         offset,
                         self.ecx.expr_vec_slice(sp, arms),
-                        self.ecx.expr_vec_slice(sp, default),
-                        ])
+                        self.ecx.expr_vec_slice(sp, default)))
             }
         };
         let life = self.ecx.lifetime(sp, self.ecx.ident_of("static").name);
@@ -512,7 +510,7 @@ impl<'a> Context<'a> {
                 true,
                 self.rtpath("Method"),
                 opt_vec::with(life),
-                ~[]
+                Vec::new()
                     ), None);
         let st = ast::ItemStatic(ty, ast::MutImmutable, method);
         let static_name = self.ecx.ident_of(format!("__STATIC_METHOD_{}",
@@ -530,13 +528,13 @@ impl<'a> Context<'a> {
                 let s = token::intern_and_get_ident(s);
                 self.ecx.expr_call_global(sp,
                                           self.rtpath("String"),
-                                          ~[
+                                          vec!(
                     self.ecx.expr_str(sp, s)
-                ])
+                ))
             }
             parse::CurrentArgument => {
                 let nil = self.ecx.expr_lit(sp, ast::LitNil);
-                self.ecx.expr_call_global(sp, self.rtpath("CurrentArgument"), ~[nil])
+                self.ecx.expr_call_global(sp, self.rtpath("CurrentArgument"), vec!(nil))
             }
             parse::Argument(ref arg) => {
                 // Translate the position
@@ -549,7 +547,7 @@ impl<'a> Context<'a> {
                     }
                     parse::ArgumentIs(i) => {
                         self.ecx.expr_call_global(sp, self.rtpath("ArgumentIs"),
-                                                  ~[self.ecx.expr_uint(sp, i)])
+                                                  vec!(self.ecx.expr_uint(sp, i)))
                     }
                     // Named arguments are converted to positional arguments at
                     // the end of the list of arguments
@@ -560,7 +558,7 @@ impl<'a> Context<'a> {
                         };
                         let i = i + self.args.len();
                         self.ecx.expr_call_global(sp, self.rtpath("ArgumentIs"),
-                                                  ~[self.ecx.expr_uint(sp, i)])
+                                                  vec!(self.ecx.expr_uint(sp, i)))
                     }
                 };
 
@@ -583,13 +581,12 @@ impl<'a> Context<'a> {
                 let prec = self.trans_count(arg.format.precision);
                 let width = self.trans_count(arg.format.width);
                 let path = self.ecx.path_global(sp, self.rtpath("FormatSpec"));
-                let fmt = self.ecx.expr_struct(sp, path, ~[
+                let fmt = self.ecx.expr_struct(sp, path, vec!(
                     self.ecx.field_imm(sp, self.ecx.ident_of("fill"), fill),
                     self.ecx.field_imm(sp, self.ecx.ident_of("align"), align),
                     self.ecx.field_imm(sp, self.ecx.ident_of("flags"), flags),
                     self.ecx.field_imm(sp, self.ecx.ident_of("precision"), prec),
-                    self.ecx.field_imm(sp, self.ecx.ident_of("width"), width),
-                ]);
+                    self.ecx.field_imm(sp, self.ecx.ident_of("width"), width)));
 
                 // Translate the method (if any)
                 let method = match arg.method {
@@ -600,12 +597,11 @@ impl<'a> Context<'a> {
                     }
                 };
                 let path = self.ecx.path_global(sp, self.rtpath("Argument"));
-                let s = self.ecx.expr_struct(sp, path, ~[
+                let s = self.ecx.expr_struct(sp, path, vec!(
                     self.ecx.field_imm(sp, self.ecx.ident_of("position"), pos),
                     self.ecx.field_imm(sp, self.ecx.ident_of("format"), fmt),
-                    self.ecx.field_imm(sp, self.ecx.ident_of("method"), method),
-                ]);
-                self.ecx.expr_call_global(sp, self.rtpath("Argument"), ~[s])
+                    self.ecx.field_imm(sp, self.ecx.ident_of("method"), method)));
+                self.ecx.expr_call_global(sp, self.rtpath("Argument"), vec!(s))
             }
         }
     }
@@ -613,11 +609,11 @@ impl<'a> Context<'a> {
     /// Actually builds the expression which the iformat! block will be expanded
     /// to
     fn to_expr(&self, extra: @ast::Expr) -> @ast::Expr {
-        let mut lets = ~[];
-        let mut locals = ~[];
+        let mut lets = Vec::new();
+        let mut locals = Vec::new();
         let mut names = vec::from_fn(self.name_positions.len(), |_| None);
-        let mut pats = ~[];
-        let mut heads = ~[];
+        let mut pats = Vec::new();
+        let mut heads = Vec::new();
 
         // First, declare all of our methods that are statics
         for &method in self.method_statics.iter() {
@@ -631,15 +627,14 @@ impl<'a> Context<'a> {
         let fmt = self.ecx.expr_vec(self.fmtsp, self.pieces.clone());
         let piece_ty = self.ecx.ty_path(self.ecx.path_all(
                 self.fmtsp,
-                true, ~[
+                true, vec!(
                     self.ecx.ident_of("std"),
                     self.ecx.ident_of("fmt"),
                     self.ecx.ident_of("rt"),
-                    self.ecx.ident_of("Piece"),
-                ],
+                    self.ecx.ident_of("Piece")),
                 opt_vec::with(
                     self.ecx.lifetime(self.fmtsp, self.ecx.ident_of("static").name)),
-                ~[]
+                Vec::new()
             ), None);
         let ty = ast::TyFixedLengthVec(
             piece_ty,
@@ -661,7 +656,9 @@ impl<'a> Context<'a> {
         // of each variable because we don't want to move out of the arguments
         // passed to this function.
         for (i, &e) in self.args.iter().enumerate() {
-            if self.arg_types[i].is_none() { continue } // error already generated
+            if self.arg_types.get(i).is_none() {
+                continue // error already generated
+            }
 
             let name = self.ecx.ident_of(format!("__arg{}", i));
             pats.push(self.ecx.pat_ident(e.span, name));
@@ -696,18 +693,17 @@ impl<'a> Context<'a> {
         // Now create the fmt::Arguments struct with all our locals we created.
         let fmt = self.ecx.expr_ident(self.fmtsp, static_name);
         let args_slice = self.ecx.expr_ident(self.fmtsp, slicename);
-        let result = self.ecx.expr_call_global(self.fmtsp, ~[
+        let result = self.ecx.expr_call_global(self.fmtsp, vec!(
                 self.ecx.ident_of("std"),
                 self.ecx.ident_of("fmt"),
                 self.ecx.ident_of("Arguments"),
-                self.ecx.ident_of("new"),
-            ], ~[fmt, args_slice]);
+                self.ecx.ident_of("new")), vec!(fmt, args_slice));
 
         // We did all the work of making sure that the arguments
         // structure is safe, so we can safely have an unsafe block.
         let result = self.ecx.expr_block(P(ast::Block {
-           view_items: ~[],
-           stmts: ~[],
+           view_items: Vec::new(),
+           stmts: Vec::new(),
            expr: Some(result),
            id: ast::DUMMY_NODE_ID,
            rules: ast::UnsafeBlock(ast::CompilerGenerated),
@@ -716,8 +712,8 @@ impl<'a> Context<'a> {
         let resname = self.ecx.ident_of("__args");
         lets.push(self.ecx.stmt_let(self.fmtsp, false, resname, result));
         let res = self.ecx.expr_ident(self.fmtsp, resname);
-        let result = self.ecx.expr_call(extra.span, extra, ~[
-                            self.ecx.expr_addr_of(extra.span, res)]);
+        let result = self.ecx.expr_call(extra.span, extra, vec!(
+                            self.ecx.expr_addr_of(extra.span, res)));
         let body = self.ecx.expr_block(self.ecx.block(self.fmtsp, lets,
                                                       Some(result)));
 
@@ -749,15 +745,15 @@ impl<'a> Context<'a> {
         // But the nested match expression is proved to perform not as well
         // as series of let's; the first approach does.
         let pat = self.ecx.pat(self.fmtsp, ast::PatTup(pats));
-        let arm = self.ecx.arm(self.fmtsp, ~[pat], body);
+        let arm = self.ecx.arm(self.fmtsp, vec!(pat), body);
         let head = self.ecx.expr(self.fmtsp, ast::ExprTup(heads));
-        self.ecx.expr_match(self.fmtsp, head, ~[arm])
+        self.ecx.expr_match(self.fmtsp, head, vec!(arm))
     }
 
     fn format_arg(&self, sp: Span, argno: Position, arg: @ast::Expr)
                   -> @ast::Expr {
         let ty = match argno {
-            Exact(ref i) => self.arg_types[*i].get_ref(),
+            Exact(ref i) => self.arg_types.get(*i).get_ref(),
             Named(ref s) => self.name_types.get(s)
         };
 
@@ -787,31 +783,27 @@ impl<'a> Context<'a> {
                 }
             }
             String => {
-                return self.ecx.expr_call_global(sp, ~[
+                return self.ecx.expr_call_global(sp, vec!(
                         self.ecx.ident_of("std"),
                         self.ecx.ident_of("fmt"),
-                        self.ecx.ident_of("argumentstr"),
-                    ], ~[arg])
+                        self.ecx.ident_of("argumentstr")), vec!(arg))
             }
             Unsigned => {
-                return self.ecx.expr_call_global(sp, ~[
+                return self.ecx.expr_call_global(sp, vec!(
                         self.ecx.ident_of("std"),
                         self.ecx.ident_of("fmt"),
-                        self.ecx.ident_of("argumentuint"),
-                    ], ~[arg])
+                        self.ecx.ident_of("argumentuint")), vec!(arg))
             }
         };
 
-        let format_fn = self.ecx.path_global(sp, ~[
+        let format_fn = self.ecx.path_global(sp, vec!(
                 self.ecx.ident_of("std"),
                 self.ecx.ident_of("fmt"),
-                self.ecx.ident_of(fmt_fn),
-            ]);
-        self.ecx.expr_call_global(sp, ~[
+                self.ecx.ident_of(fmt_fn)));
+        self.ecx.expr_call_global(sp, vec!(
                 self.ecx.ident_of("std"),
                 self.ecx.ident_of("fmt"),
-                self.ecx.ident_of("argument"),
-            ], ~[self.ecx.expr_path(format_fn), arg])
+                self.ecx.ident_of("argument")), vec!(self.ecx.expr_path(format_fn), arg))
     }
 }
 
@@ -832,10 +824,10 @@ pub fn expand_args(ecx: &mut ExtCtxt, sp: Span,
 /// expression.
 pub fn expand_preparsed_format_args(ecx: &mut ExtCtxt, sp: Span,
                                     extra: @ast::Expr,
-                                    efmt: @ast::Expr, args: ~[@ast::Expr],
-                                    name_ordering: ~[~str],
+                                    efmt: @ast::Expr, args: Vec<@ast::Expr>,
+                                    name_ordering: Vec<~str>,
                                     names: HashMap<~str, @ast::Expr>) -> @ast::Expr {
-    let arg_types = vec::from_fn(args.len(), |_| None);
+    let arg_types = Vec::from_fn(args.len(), |_| None);
     let mut cx = Context {
         ecx: ecx,
         args: args,
@@ -846,8 +838,8 @@ pub fn expand_preparsed_format_args(ecx: &mut ExtCtxt, sp: Span,
         name_ordering: name_ordering,
         nest_level: 0,
         next_arg: 0,
-        pieces: ~[],
-        method_statics: ~[],
+        pieces: Vec::new(),
+        method_statics: Vec::new(),
         fmtsp: sp,
     };
     cx.fmtsp = efmt.span;
@@ -884,7 +876,7 @@ pub fn expand_preparsed_format_args(ecx: &mut ExtCtxt, sp: Span,
     // Make sure that all arguments were used and all arguments have types.
     for (i, ty) in cx.arg_types.iter().enumerate() {
         if ty.is_none() {
-            cx.ecx.span_err(cx.args[i].span, "argument never used");
+            cx.ecx.span_err(cx.args.get(i).span, "argument never used");
         }
     }
     for (name, e) in cx.names.iter() {
diff --git a/src/libsyntax/ext/log_syntax.rs b/src/libsyntax/ext/log_syntax.rs
index 5ee4084d207ba..b94928238e9bb 100644
--- a/src/libsyntax/ext/log_syntax.rs
+++ b/src/libsyntax/ext/log_syntax.rs
@@ -20,7 +20,8 @@ pub fn expand_syntax_ext(cx: &mut ExtCtxt,
                       -> base::MacResult {
 
     cx.print_backtrace();
-    println!("{}", print::pprust::tt_to_str(&ast::TTDelim(@tt.to_owned())));
+    println!("{}", print::pprust::tt_to_str(&ast::TTDelim(
+                @tt.iter().map(|x| (*x).clone()).collect())));
 
     //trivial expression
     MRExpr(@ast::Expr {
diff --git a/src/libsyntax/ext/quote.rs b/src/libsyntax/ext/quote.rs
index 35a5cbd235ae4..e96597d41594b 100644
--- a/src/libsyntax/ext/quote.rs
+++ b/src/libsyntax/ext/quote.rs
@@ -17,6 +17,8 @@ use parse::token::*;
 use parse::token;
 use parse;
 
+use std::vec_ng::Vec;
+
 /**
 *
 * Quasiquoting works via token trees.
@@ -35,17 +37,19 @@ pub mod rt {
     use parse;
     use print::pprust;
 
+    use std::vec_ng::Vec;
+
     pub use ast::*;
     pub use parse::token::*;
     pub use parse::new_parser_from_tts;
     pub use codemap::{BytePos, Span, dummy_spanned};
 
     pub trait ToTokens {
-        fn to_tokens(&self, _cx: &ExtCtxt) -> ~[TokenTree];
+        fn to_tokens(&self, _cx: &ExtCtxt) -> Vec<TokenTree> ;
     }
 
-    impl ToTokens for ~[TokenTree] {
-        fn to_tokens(&self, _cx: &ExtCtxt) -> ~[TokenTree] {
+    impl ToTokens for Vec<TokenTree> {
+        fn to_tokens(&self, _cx: &ExtCtxt) -> Vec<TokenTree> {
             (*self).clone()
         }
     }
@@ -201,7 +205,7 @@ pub mod rt {
     macro_rules! impl_to_tokens(
         ($t:ty) => (
             impl ToTokens for $t {
-                fn to_tokens(&self, cx: &ExtCtxt) -> ~[TokenTree] {
+                fn to_tokens(&self, cx: &ExtCtxt) -> Vec<TokenTree> {
                     cx.parse_tts(self.to_source())
                 }
             }
@@ -211,7 +215,7 @@ pub mod rt {
     macro_rules! impl_to_tokens_self(
         ($t:ty) => (
             impl<'a> ToTokens for $t {
-                fn to_tokens(&self, cx: &ExtCtxt) -> ~[TokenTree] {
+                fn to_tokens(&self, cx: &ExtCtxt) -> Vec<TokenTree> {
                     cx.parse_tts(self.to_source())
                 }
             }
@@ -242,7 +246,7 @@ pub mod rt {
         fn parse_item(&self, s: ~str) -> @ast::Item;
         fn parse_expr(&self, s: ~str) -> @ast::Expr;
         fn parse_stmt(&self, s: ~str) -> @ast::Stmt;
-        fn parse_tts(&self, s: ~str) -> ~[ast::TokenTree];
+        fn parse_tts(&self, s: ~str) -> Vec<ast::TokenTree> ;
     }
 
     impl<'a> ExtParseUtils for ExtCtxt<'a> {
@@ -266,7 +270,7 @@ pub mod rt {
             parse::parse_stmt_from_source_str("<quote expansion>".to_str(),
                                               s,
                                               self.cfg(),
-                                              ~[],
+                                              Vec::new(),
                                               self.parse_sess())
         }
 
@@ -277,7 +281,7 @@ pub mod rt {
                                               self.parse_sess())
         }
 
-        fn parse_tts(&self, s: ~str) -> ~[ast::TokenTree] {
+        fn parse_tts(&self, s: ~str) -> Vec<ast::TokenTree> {
             parse::parse_tts_from_source_str("<quote expansion>".to_str(),
                                              s,
                                              self.cfg(),
@@ -298,16 +302,16 @@ pub fn expand_quote_tokens(cx: &mut ExtCtxt,
 pub fn expand_quote_expr(cx: &mut ExtCtxt,
                          sp: Span,
                          tts: &[ast::TokenTree]) -> base::MacResult {
-    let expanded = expand_parse_call(cx, sp, "parse_expr", ~[], tts);
+    let expanded = expand_parse_call(cx, sp, "parse_expr", Vec::new(), tts);
     base::MRExpr(expanded)
 }
 
 pub fn expand_quote_item(cx: &mut ExtCtxt,
                          sp: Span,
                          tts: &[ast::TokenTree]) -> base::MacResult {
-    let e_attrs = cx.expr_vec_uniq(sp, ~[]);
+    let e_attrs = cx.expr_vec_ng(sp);
     let expanded = expand_parse_call(cx, sp, "parse_item",
-                                    ~[e_attrs], tts);
+                                    vec!(e_attrs), tts);
     base::MRExpr(expanded)
 }
 
@@ -316,7 +320,7 @@ pub fn expand_quote_pat(cx: &mut ExtCtxt,
                         tts: &[ast::TokenTree]) -> base::MacResult {
     let e_refutable = cx.expr_lit(sp, ast::LitBool(true));
     let expanded = expand_parse_call(cx, sp, "parse_pat",
-                                    ~[e_refutable], tts);
+                                    vec!(e_refutable), tts);
     base::MRExpr(expanded)
 }
 
@@ -325,20 +329,20 @@ pub fn expand_quote_ty(cx: &mut ExtCtxt,
                        tts: &[ast::TokenTree]) -> base::MacResult {
     let e_param_colons = cx.expr_lit(sp, ast::LitBool(false));
     let expanded = expand_parse_call(cx, sp, "parse_ty",
-                                     ~[e_param_colons], tts);
+                                     vec!(e_param_colons), tts);
     base::MRExpr(expanded)
 }
 
 pub fn expand_quote_stmt(cx: &mut ExtCtxt,
                          sp: Span,
                          tts: &[ast::TokenTree]) -> base::MacResult {
-    let e_attrs = cx.expr_vec_uniq(sp, ~[]);
+    let e_attrs = cx.expr_vec_ng(sp);
     let expanded = expand_parse_call(cx, sp, "parse_stmt",
-                                    ~[e_attrs], tts);
+                                    vec!(e_attrs), tts);
     base::MRExpr(expanded)
 }
 
-fn ids_ext(strs: ~[~str]) -> ~[ast::Ident] {
+fn ids_ext(strs: Vec<~str> ) -> Vec<ast::Ident> {
     strs.map(|str| str_to_ident(*str))
 }
 
@@ -352,7 +356,7 @@ fn mk_ident(cx: &ExtCtxt, sp: Span, ident: ast::Ident) -> @ast::Expr {
     cx.expr_method_call(sp,
                         cx.expr_ident(sp, id_ext("ext_cx")),
                         id_ext("ident_of"),
-                        ~[e_str])
+                        vec!(e_str))
 }
 
 fn mk_binop(cx: &ExtCtxt, sp: Span, bop: token::BinOp) -> @ast::Expr {
@@ -377,18 +381,18 @@ fn mk_token(cx: &ExtCtxt, sp: Span, tok: &token::Token) -> @ast::Expr {
         BINOP(binop) => {
             return cx.expr_call_ident(sp,
                                       id_ext("BINOP"),
-                                      ~[mk_binop(cx, sp, binop)]);
+                                      vec!(mk_binop(cx, sp, binop)));
         }
         BINOPEQ(binop) => {
             return cx.expr_call_ident(sp,
                                       id_ext("BINOPEQ"),
-                                      ~[mk_binop(cx, sp, binop)]);
+                                      vec!(mk_binop(cx, sp, binop)));
         }
 
         LIT_CHAR(i) => {
             let e_char = cx.expr_lit(sp, ast::LitChar(i));
 
-            return cx.expr_call_ident(sp, id_ext("LIT_CHAR"), ~[e_char]);
+            return cx.expr_call_ident(sp, id_ext("LIT_CHAR"), vec!(e_char));
         }
 
         LIT_INT(i, ity) => {
@@ -405,7 +409,7 @@ fn mk_token(cx: &ExtCtxt, sp: Span, tok: &token::Token) -> @ast::Expr {
 
             return cx.expr_call_ident(sp,
                                       id_ext("LIT_INT"),
-                                      ~[e_i64, e_ity]);
+                                      vec!(e_i64, e_ity));
         }
 
         LIT_UINT(u, uty) => {
@@ -422,7 +426,7 @@ fn mk_token(cx: &ExtCtxt, sp: Span, tok: &token::Token) -> @ast::Expr {
 
             return cx.expr_call_ident(sp,
                                       id_ext("LIT_UINT"),
-                                      ~[e_u64, e_uty]);
+                                      vec!(e_u64, e_uty));
         }
 
         LIT_INT_UNSUFFIXED(i) => {
@@ -430,7 +434,7 @@ fn mk_token(cx: &ExtCtxt, sp: Span, tok: &token::Token) -> @ast::Expr {
 
             return cx.expr_call_ident(sp,
                                       id_ext("LIT_INT_UNSUFFIXED"),
-                                      ~[e_i64]);
+                                      vec!(e_i64));
         }
 
         LIT_FLOAT(fident, fty) => {
@@ -444,39 +448,39 @@ fn mk_token(cx: &ExtCtxt, sp: Span, tok: &token::Token) -> @ast::Expr {
 
             return cx.expr_call_ident(sp,
                                       id_ext("LIT_FLOAT"),
-                                      ~[e_fident, e_fty]);
+                                      vec!(e_fident, e_fty));
         }
 
         LIT_STR(ident) => {
             return cx.expr_call_ident(sp,
                                       id_ext("LIT_STR"),
-                                      ~[mk_ident(cx, sp, ident)]);
+                                      vec!(mk_ident(cx, sp, ident)));
         }
 
         LIT_STR_RAW(ident, n) => {
             return cx.expr_call_ident(sp,
                                       id_ext("LIT_STR_RAW"),
-                                      ~[mk_ident(cx, sp, ident),
-                                        cx.expr_uint(sp, n)]);
+                                      vec!(mk_ident(cx, sp, ident),
+                                        cx.expr_uint(sp, n)));
         }
 
         IDENT(ident, b) => {
             return cx.expr_call_ident(sp,
                                       id_ext("IDENT"),
-                                      ~[mk_ident(cx, sp, ident),
-                                        cx.expr_bool(sp, b)]);
+                                      vec!(mk_ident(cx, sp, ident),
+                                        cx.expr_bool(sp, b)));
         }
 
         LIFETIME(ident) => {
             return cx.expr_call_ident(sp,
                                       id_ext("LIFETIME"),
-                                      ~[mk_ident(cx, sp, ident)]);
+                                      vec!(mk_ident(cx, sp, ident)));
         }
 
         DOC_COMMENT(ident) => {
             return cx.expr_call_ident(sp,
                                       id_ext("DOC_COMMENT"),
-                                      ~[mk_ident(cx, sp, ident)]);
+                                      vec!(mk_ident(cx, sp, ident)));
         }
 
         INTERPOLATED(_) => fail!("quote! with interpolated token"),
@@ -523,7 +527,7 @@ fn mk_token(cx: &ExtCtxt, sp: Span, tok: &token::Token) -> @ast::Expr {
 }
 
 
-fn mk_tt(cx: &ExtCtxt, sp: Span, tt: &ast::TokenTree) -> ~[@ast::Stmt] {
+fn mk_tt(cx: &ExtCtxt, sp: Span, tt: &ast::TokenTree) -> Vec<@ast::Stmt> {
 
     match *tt {
 
@@ -531,16 +535,16 @@ fn mk_tt(cx: &ExtCtxt, sp: Span, tt: &ast::TokenTree) -> ~[@ast::Stmt] {
             let e_sp = cx.expr_ident(sp, id_ext("_sp"));
             let e_tok = cx.expr_call_ident(sp,
                                            id_ext("TTTok"),
-                                           ~[e_sp, mk_token(cx, sp, tok)]);
+                                           vec!(e_sp, mk_token(cx, sp, tok)));
             let e_push =
                 cx.expr_method_call(sp,
                                     cx.expr_ident(sp, id_ext("tt")),
                                     id_ext("push"),
-                                    ~[e_tok]);
-            ~[cx.stmt_expr(e_push)]
+                                    vec!(e_tok));
+            vec!(cx.stmt_expr(e_push))
         }
 
-        ast::TTDelim(ref tts) => mk_tts(cx, sp, **tts),
+        ast::TTDelim(ref tts) => mk_tts(cx, sp, tts.as_slice()),
         ast::TTSeq(..) => fail!("TTSeq in quote!"),
 
         ast::TTNonterminal(sp, ident) => {
@@ -551,22 +555,22 @@ fn mk_tt(cx: &ExtCtxt, sp: Span, tt: &ast::TokenTree) -> ~[@ast::Stmt] {
                 cx.expr_method_call(sp,
                                     cx.expr_ident(sp, ident),
                                     id_ext("to_tokens"),
-                                    ~[cx.expr_ident(sp, id_ext("ext_cx"))]);
+                                    vec!(cx.expr_ident(sp, id_ext("ext_cx"))));
 
             let e_push =
                 cx.expr_method_call(sp,
                                     cx.expr_ident(sp, id_ext("tt")),
                                     id_ext("push_all_move"),
-                                    ~[e_to_toks]);
+                                    vec!(e_to_toks));
 
-            ~[cx.stmt_expr(e_push)]
+            vec!(cx.stmt_expr(e_push))
         }
     }
 }
 
 fn mk_tts(cx: &ExtCtxt, sp: Span, tts: &[ast::TokenTree])
-    -> ~[@ast::Stmt] {
-    let mut ss = ~[];
+    -> Vec<@ast::Stmt> {
+    let mut ss = Vec::new();
     for tt in tts.iter() {
         ss.push_all_move(mk_tt(cx, sp, tt));
     }
@@ -583,7 +587,9 @@ fn expand_tts(cx: &ExtCtxt, sp: Span, tts: &[ast::TokenTree])
 
     let mut p = parse::new_parser_from_tts(cx.parse_sess(),
                                            cx.cfg(),
-                                           tts.to_owned());
+                                           tts.iter()
+                                              .map(|x| (*x).clone())
+                                              .collect());
     p.quote_depth += 1u;
 
     let cx_expr = p.parse_expr();
@@ -623,20 +629,20 @@ fn expand_tts(cx: &ExtCtxt, sp: Span, tts: &[ast::TokenTree])
     let e_sp = cx.expr_method_call(sp,
                                    cx.expr_ident(sp, id_ext("ext_cx")),
                                    id_ext("call_site"),
-                                   ~[]);
+                                   Vec::new());
 
     let stmt_let_sp = cx.stmt_let(sp, false,
                                   id_ext("_sp"),
                                   e_sp);
 
-    let stmt_let_tt = cx.stmt_let(sp, true,
-                                  id_ext("tt"),
-                                  cx.expr_vec_uniq(sp, ~[]));
+    let stmt_let_tt = cx.stmt_let(sp, true, id_ext("tt"), cx.expr_vec_ng(sp));
 
+    let mut vector = vec!(stmt_let_sp, stmt_let_tt);
+    vector.push_all_move(mk_tts(cx, sp, tts.as_slice()));
     let block = cx.expr_block(
         cx.block_all(sp,
-                     ~[],
-                     ~[stmt_let_sp, stmt_let_tt] + mk_tts(cx, sp, tts),
+                     Vec::new(),
+                     vector,
                      Some(cx.expr_ident(sp, id_ext("tt")))));
 
     (cx_expr, block)
@@ -646,36 +652,36 @@ fn expand_wrapper(cx: &ExtCtxt,
                   sp: Span,
                   cx_expr: @ast::Expr,
                   expr: @ast::Expr) -> @ast::Expr {
-    let uses = ~[ cx.view_use_glob(sp, ast::Inherited,
-                                   ids_ext(~[~"syntax",
+    let uses = vec!( cx.view_use_glob(sp, ast::Inherited,
+                                   ids_ext(vec!(~"syntax",
                                              ~"ext",
                                              ~"quote",
-                                             ~"rt"])) ];
+                                             ~"rt"))) );
 
     let stmt_let_ext_cx = cx.stmt_let(sp, false, id_ext("ext_cx"), cx_expr);
 
-    cx.expr_block(cx.block_all(sp, uses, ~[stmt_let_ext_cx], Some(expr)))
+    cx.expr_block(cx.block_all(sp, uses, vec!(stmt_let_ext_cx), Some(expr)))
 }
 
 fn expand_parse_call(cx: &ExtCtxt,
                      sp: Span,
                      parse_method: &str,
-                     arg_exprs: ~[@ast::Expr],
+                     arg_exprs: Vec<@ast::Expr> ,
                      tts: &[ast::TokenTree]) -> @ast::Expr {
     let (cx_expr, tts_expr) = expand_tts(cx, sp, tts);
 
     let cfg_call = || cx.expr_method_call(
         sp, cx.expr_ident(sp, id_ext("ext_cx")),
-        id_ext("cfg"), ~[]);
+        id_ext("cfg"), Vec::new());
 
     let parse_sess_call = || cx.expr_method_call(
         sp, cx.expr_ident(sp, id_ext("ext_cx")),
-        id_ext("parse_sess"), ~[]);
+        id_ext("parse_sess"), Vec::new());
 
     let new_parser_call =
         cx.expr_call(sp,
                      cx.expr_ident(sp, id_ext("new_parser_from_tts")),
-                     ~[parse_sess_call(), cfg_call(), tts_expr]);
+                     vec!(parse_sess_call(), cfg_call(), tts_expr));
 
     let expr = cx.expr_method_call(sp, new_parser_call, id_ext(parse_method),
                                    arg_exprs);
diff --git a/src/libsyntax/ext/registrar.rs b/src/libsyntax/ext/registrar.rs
index f0bad1b40ebbd..4c18eb83afcee 100644
--- a/src/libsyntax/ext/registrar.rs
+++ b/src/libsyntax/ext/registrar.rs
@@ -15,15 +15,18 @@ use diagnostic;
 use visit;
 use visit::Visitor;
 
+use std::vec_ng::Vec;
+
 struct MacroRegistrarContext {
-    registrars: ~[(ast::NodeId, Span)],
+    registrars: Vec<(ast::NodeId, Span)> ,
 }
 
 impl Visitor<()> for MacroRegistrarContext {
     fn visit_item(&mut self, item: &ast::Item, _: ()) {
         match item.node {
             ast::ItemFn(..) => {
-                if attr::contains_name(item.attrs, "macro_registrar") {
+                if attr::contains_name(item.attrs.as_slice(),
+                                       "macro_registrar") {
                     self.registrars.push((item.id, item.span));
                 }
             }
@@ -36,7 +39,7 @@ impl Visitor<()> for MacroRegistrarContext {
 
 pub fn find_macro_registrar(diagnostic: @diagnostic::SpanHandler,
                             krate: &ast::Crate) -> Option<ast::DefId> {
-    let mut ctx = MacroRegistrarContext { registrars: ~[] };
+    let mut ctx = MacroRegistrarContext { registrars: Vec::new() };
     visit::walk_crate(&mut ctx, krate, ());
 
     match ctx.registrars.len() {
diff --git a/src/libsyntax/ext/source_util.rs b/src/libsyntax/ext/source_util.rs
index c81ee55c23768..b31388f58eb9f 100644
--- a/src/libsyntax/ext/source_util.rs
+++ b/src/libsyntax/ext/source_util.rs
@@ -142,6 +142,7 @@ pub fn expand_include_bin(cx: &mut ExtCtxt, sp: Span, tts: &[ast::TokenTree])
             return MacResult::dummy_expr(sp);
         }
         Ok(bytes) => {
+            let bytes = bytes.iter().map(|x| *x).collect();
             base::MRExpr(cx.expr_lit(sp, ast::LitBinary(Rc::new(bytes))))
         }
     }
diff --git a/src/libsyntax/ext/trace_macros.rs b/src/libsyntax/ext/trace_macros.rs
index db2c9dcddb6dc..183cccde18e86 100644
--- a/src/libsyntax/ext/trace_macros.rs
+++ b/src/libsyntax/ext/trace_macros.rs
@@ -24,7 +24,7 @@ pub fn expand_trace_macros(cx: &mut ExtCtxt,
     let cfg = cx.cfg();
     let tt_rdr = new_tt_reader(cx.parse_sess().span_diagnostic,
                                None,
-                               tt.to_owned());
+                               tt.iter().map(|x| (*x).clone()).collect());
     let mut rust_parser = Parser(sess, cfg.clone(), tt_rdr.dup());
 
     if rust_parser.is_keyword(keywords::True) {
diff --git a/src/libsyntax/ext/tt/macro_parser.rs b/src/libsyntax/ext/tt/macro_parser.rs
index edd875a57a749..c9d3150c2cd41 100644
--- a/src/libsyntax/ext/tt/macro_parser.rs
+++ b/src/libsyntax/ext/tt/macro_parser.rs
@@ -22,7 +22,7 @@ use parse::token::{Token, EOF, Nonterminal};
 use parse::token;
 
 use collections::HashMap;
-use std::vec;
+use std::vec_ng::Vec;
 
 /* This is an Earley-like parser, without support for in-grammar nonterminals,
 only by calling out to the main rust parser for named nonterminals (which it
@@ -99,11 +99,11 @@ nonempty body. */
 
 #[deriving(Clone)]
 pub struct MatcherPos {
-    elts: ~[ast::Matcher], // maybe should be <'>? Need to understand regions.
+    elts: Vec<ast::Matcher> , // maybe should be <'>? Need to understand regions.
     sep: Option<Token>,
     idx: uint,
     up: Option<~MatcherPos>,
-    matches: ~[~[@NamedMatch]],
+    matches: Vec<Vec<@NamedMatch>>,
     match_lo: uint, match_hi: uint,
     sp_lo: BytePos,
 }
@@ -112,12 +112,14 @@ pub fn count_names(ms: &[Matcher]) -> uint {
     ms.iter().fold(0, |ct, m| {
         ct + match m.node {
             MatchTok(_) => 0u,
-            MatchSeq(ref more_ms, _, _, _, _) => count_names((*more_ms)),
+            MatchSeq(ref more_ms, _, _, _, _) => {
+                count_names(more_ms.as_slice())
+            }
             MatchNonterminal(_, _, _) => 1u
         }})
 }
 
-pub fn initial_matcher_pos(ms: ~[Matcher], sep: Option<Token>, lo: BytePos)
+pub fn initial_matcher_pos(ms: Vec<Matcher> , sep: Option<Token>, lo: BytePos)
                         -> ~MatcherPos {
     let mut match_idx_hi = 0u;
     for elt in ms.iter() {
@@ -131,7 +133,7 @@ pub fn initial_matcher_pos(ms: ~[Matcher], sep: Option<Token>, lo: BytePos)
             }
         }
     }
-    let matches = vec::from_fn(count_names(ms), |_i| ~[]);
+    let matches = Vec::from_fn(count_names(ms.as_slice()), |_i| Vec::new());
     ~MatcherPos {
         elts: ms,
         sep: sep,
@@ -164,7 +166,7 @@ pub fn initial_matcher_pos(ms: ~[Matcher], sep: Option<Token>, lo: BytePos)
 // ast::Matcher it was derived from.
 
 pub enum NamedMatch {
-    MatchedSeq(~[@NamedMatch], codemap::Span),
+    MatchedSeq(Vec<@NamedMatch> , codemap::Span),
     MatchedNonterminal(Nonterminal)
 }
 
@@ -206,9 +208,9 @@ pub enum ParseResult {
 pub fn parse_or_else<R: Reader>(sess: @ParseSess,
                                 cfg: ast::CrateConfig,
                                 rdr: R,
-                                ms: ~[Matcher])
+                                ms: Vec<Matcher> )
                                 -> HashMap<Ident, @NamedMatch> {
-    match parse(sess, cfg, rdr, ms) {
+    match parse(sess, cfg, rdr, ms.as_slice()) {
         Success(m) => m,
         Failure(sp, str) => sess.span_diagnostic.span_fatal(sp, str),
         Error(sp, str) => sess.span_diagnostic.span_fatal(sp, str)
@@ -230,13 +232,17 @@ pub fn parse<R: Reader>(sess: @ParseSess,
                         rdr: R,
                         ms: &[Matcher])
                         -> ParseResult {
-    let mut cur_eis = ~[];
-    cur_eis.push(initial_matcher_pos(ms.to_owned(), None, rdr.peek().sp.lo));
+    let mut cur_eis = Vec::new();
+    cur_eis.push(initial_matcher_pos(ms.iter()
+                                       .map(|x| (*x).clone())
+                                       .collect(),
+                                     None,
+                                     rdr.peek().sp.lo));
 
     loop {
-        let mut bb_eis = ~[]; // black-box parsed by parser.rs
-        let mut next_eis = ~[]; // or proceed normally
-        let mut eof_eis = ~[];
+        let mut bb_eis = Vec::new(); // black-box parsed by parser.rs
+        let mut next_eis = Vec::new(); // or proceed normally
+        let mut eof_eis = Vec::new();
 
         let TokenAndSpan {tok: tok, sp: sp} = rdr.peek();
 
@@ -274,8 +280,9 @@ pub fn parse<R: Reader>(sess: @ParseSess,
 
                         // Only touch the binders we have actually bound
                         for idx in range(ei.match_lo, ei.match_hi) {
-                            let sub = ei.matches[idx].clone();
-                            new_pos.matches[idx]
+                            let sub = (*ei.matches.get(idx)).clone();
+                            new_pos.matches
+                                   .get_mut(idx)
                                    .push(@MatchedSeq(sub, mk_sp(ei.sp_lo,
                                                                 sp.hi)));
                         }
@@ -308,7 +315,7 @@ pub fn parse<R: Reader>(sess: @ParseSess,
                     eof_eis.push(ei);
                 }
             } else {
-                match ei.elts[idx].node.clone() {
+                match ei.elts.get(idx).node.clone() {
                   /* need to descend into sequence */
                   MatchSeq(ref matchers, ref sep, zero_ok,
                            match_idx_lo, match_idx_hi) => {
@@ -317,13 +324,15 @@ pub fn parse<R: Reader>(sess: @ParseSess,
                         new_ei.idx += 1u;
                         //we specifically matched zero repeats.
                         for idx in range(match_idx_lo, match_idx_hi) {
-                            new_ei.matches[idx].push(@MatchedSeq(~[], sp));
+                            new_ei.matches
+                                  .get_mut(idx)
+                                  .push(@MatchedSeq(Vec::new(), sp));
                         }
 
                         cur_eis.push(new_ei);
                     }
 
-                    let matches = vec::from_elem(ei.matches.len(), ~[]);
+                    let matches = Vec::from_elem(ei.matches.len(), Vec::new());
                     let ei_t = ei;
                     cur_eis.push(~MatcherPos {
                         elts: (*matchers).clone(),
@@ -351,11 +360,11 @@ pub fn parse<R: Reader>(sess: @ParseSess,
         /* error messages here could be improved with links to orig. rules */
         if token_name_eq(&tok, &EOF) {
             if eof_eis.len() == 1u {
-                let mut v = ~[];
-                for dv in eof_eis[0u].matches.mut_iter() {
+                let mut v = Vec::new();
+                for dv in eof_eis.get_mut(0).matches.mut_iter() {
                     v.push(dv.pop().unwrap());
                 }
-                return Success(nameize(sess, ms, v));
+                return Success(nameize(sess, ms, v.as_slice()));
             } else if eof_eis.len() > 1u {
                 return Error(sp, ~"ambiguity: multiple successful parses");
             } else {
@@ -365,7 +374,7 @@ pub fn parse<R: Reader>(sess: @ParseSess,
             if (bb_eis.len() > 0u && next_eis.len() > 0u)
                 || bb_eis.len() > 1u {
                 let nts = bb_eis.map(|ei| {
-                    match ei.elts[ei.idx].node {
+                    match ei.elts.get(ei.idx).node {
                       MatchNonterminal(bind, name, _) => {
                         format!("{} ('{}')",
                                 token::get_ident(name),
@@ -390,10 +399,10 @@ pub fn parse<R: Reader>(sess: @ParseSess,
                 let mut rust_parser = Parser(sess, cfg.clone(), rdr.dup());
 
                 let mut ei = bb_eis.pop().unwrap();
-                match ei.elts[ei.idx].node {
+                match ei.elts.get(ei.idx).node {
                   MatchNonterminal(_, name, idx) => {
                     let name_string = token::get_ident(name);
-                    ei.matches[idx].push(@MatchedNonterminal(
+                    ei.matches.get_mut(idx).push(@MatchedNonterminal(
                         parse_nt(&mut rust_parser, name_string.get())));
                     ei.idx += 1u;
                   }
@@ -413,12 +422,12 @@ pub fn parse<R: Reader>(sess: @ParseSess,
 
 pub fn parse_nt(p: &mut Parser, name: &str) -> Nonterminal {
     match name {
-      "item" => match p.parse_item(~[]) {
+      "item" => match p.parse_item(Vec::new()) {
         Some(i) => token::NtItem(i),
         None => p.fatal("expected an item keyword")
       },
       "block" => token::NtBlock(p.parse_block()),
-      "stmt" => token::NtStmt(p.parse_stmt(~[])),
+      "stmt" => token::NtStmt(p.parse_stmt(Vec::new())),
       "pat" => token::NtPat(p.parse_pat()),
       "expr" => token::NtExpr(p.parse_expr()),
       "ty" => token::NtTy(p.parse_ty(false /* no need to disambiguate*/)),
diff --git a/src/libsyntax/ext/tt/macro_rules.rs b/src/libsyntax/ext/tt/macro_rules.rs
index 45fe24ebf68ff..712d5f6bd27da 100644
--- a/src/libsyntax/ext/tt/macro_rules.rs
+++ b/src/libsyntax/ext/tt/macro_rules.rs
@@ -25,9 +25,11 @@ use parse::token::{special_idents, gensym_ident};
 use parse::token::{FAT_ARROW, SEMI, NtMatchers, NtTT, EOF};
 use parse::token;
 use print;
-use std::cell::RefCell;
 use util::small_vector::SmallVector;
 
+use std::cell::RefCell;
+use std::vec_ng::Vec;
+
 struct ParserAnyMacro {
     parser: RefCell<Parser>,
 }
@@ -90,8 +92,8 @@ impl AnyMacro for ParserAnyMacro {
 
 struct MacroRulesMacroExpander {
     name: Ident,
-    lhses: @~[@NamedMatch],
-    rhses: @~[@NamedMatch],
+    lhses: @Vec<@NamedMatch> ,
+    rhses: @Vec<@NamedMatch> ,
 }
 
 impl MacroExpander for MacroRulesMacroExpander {
@@ -100,7 +102,12 @@ impl MacroExpander for MacroRulesMacroExpander {
               sp: Span,
               arg: &[ast::TokenTree])
               -> MacResult {
-        generic_extension(cx, sp, self.name, arg, *self.lhses, *self.rhses)
+        generic_extension(cx,
+                          sp,
+                          self.name,
+                          arg,
+                          self.lhses.as_slice(),
+                          self.rhses.as_slice())
     }
 }
 
@@ -115,7 +122,9 @@ fn generic_extension(cx: &ExtCtxt,
     if cx.trace_macros() {
         println!("{}! \\{ {} \\}",
                  token::get_ident(name),
-                 print::pprust::tt_to_str(&TTDelim(@arg.to_owned())));
+                 print::pprust::tt_to_str(&TTDelim(@arg.iter()
+                                                       .map(|x| (*x).clone())
+                                                       .collect())));
     }
 
     // Which arm's failure should we report? (the one furthest along)
@@ -128,8 +137,12 @@ fn generic_extension(cx: &ExtCtxt,
         match **lhs {
           MatchedNonterminal(NtMatchers(ref mtcs)) => {
             // `None` is because we're not interpolating
-            let arg_rdr = new_tt_reader(s_d, None, arg.to_owned());
-            match parse(cx.parse_sess(), cx.cfg(), arg_rdr, *mtcs) {
+            let arg_rdr = new_tt_reader(s_d,
+                                        None,
+                                        arg.iter()
+                                           .map(|x| (*x).clone())
+                                           .collect());
+            match parse(cx.parse_sess(), cx.cfg(), arg_rdr, mtcs.as_slice()) {
               Success(named_matches) => {
                 let rhs = match *rhses[i] {
                     // okay, what's your transcriber?
@@ -137,7 +150,10 @@ fn generic_extension(cx: &ExtCtxt,
                         match *tt {
                             // cut off delimiters; don't parse 'em
                             TTDelim(ref tts) => {
-                                (*tts).slice(1u,(*tts).len()-1u).to_owned()
+                                (*tts).slice(1u,(*tts).len()-1u)
+                                      .iter()
+                                      .map(|x| (*x).clone())
+                                      .collect()
                             }
                             _ => cx.span_fatal(
                                 sp, "macro rhs must be delimited")
@@ -174,7 +190,7 @@ fn generic_extension(cx: &ExtCtxt,
 pub fn add_new_extension(cx: &mut ExtCtxt,
                          sp: Span,
                          name: Ident,
-                         arg: ~[ast::TokenTree])
+                         arg: Vec<ast::TokenTree> )
                          -> base::MacResult {
     // these spans won't matter, anyways
     fn ms(m: Matcher_) -> Matcher {
@@ -191,15 +207,14 @@ pub fn add_new_extension(cx: &mut ExtCtxt,
     // The grammar for macro_rules! is:
     // $( $lhs:mtcs => $rhs:tt );+
     // ...quasiquoting this would be nice.
-    let argument_gram = ~[
-        ms(MatchSeq(~[
+    let argument_gram = vec!(
+        ms(MatchSeq(vec!(
             ms(MatchNonterminal(lhs_nm, special_idents::matchers, 0u)),
             ms(MatchTok(FAT_ARROW)),
-            ms(MatchNonterminal(rhs_nm, special_idents::tt, 1u)),
-        ], Some(SEMI), false, 0u, 2u)),
+            ms(MatchNonterminal(rhs_nm, special_idents::tt, 1u))), Some(SEMI), false, 0u, 2u)),
         //to phase into semicolon-termination instead of
         //semicolon-separation
-        ms(MatchSeq(~[ms(MatchTok(SEMI))], None, true, 2u, 2u))];
+        ms(MatchSeq(vec!(ms(MatchTok(SEMI))), None, true, 2u, 2u)));
 
 
     // Parse the macro_rules! invocation (`none` is for no interpolations):
diff --git a/src/libsyntax/ext/tt/transcribe.rs b/src/libsyntax/ext/tt/transcribe.rs
index a8c9fe372269c..a3f179e851ad3 100644
--- a/src/libsyntax/ext/tt/transcribe.rs
+++ b/src/libsyntax/ext/tt/transcribe.rs
@@ -18,11 +18,12 @@ use parse::token;
 use parse::lexer::TokenAndSpan;
 
 use std::cell::{Cell, RefCell};
+use std::vec_ng::Vec;
 use collections::HashMap;
 
 ///an unzipping of `TokenTree`s
 struct TtFrame {
-    forest: @~[ast::TokenTree],
+    forest: @Vec<ast::TokenTree> ,
     idx: Cell<uint>,
     dotdotdoted: bool,
     sep: Option<Token>,
@@ -35,8 +36,8 @@ pub struct TtReader {
     priv stack: RefCell<@TtFrame>,
     /* for MBE-style macro transcription */
     priv interpolations: RefCell<HashMap<Ident, @NamedMatch>>,
-    priv repeat_idx: RefCell<~[uint]>,
-    priv repeat_len: RefCell<~[uint]>,
+    priv repeat_idx: RefCell<Vec<uint> >,
+    priv repeat_len: RefCell<Vec<uint> >,
     /* cached: */
     cur_tok: RefCell<Token>,
     cur_span: RefCell<Span>,
@@ -47,7 +48,7 @@ pub struct TtReader {
  *  should) be none. */
 pub fn new_tt_reader(sp_diag: @SpanHandler,
                      interp: Option<HashMap<Ident, @NamedMatch>>,
-                     src: ~[ast::TokenTree])
+                     src: Vec<ast::TokenTree> )
                      -> TtReader {
     let r = TtReader {
         sp_diag: sp_diag,
@@ -62,8 +63,8 @@ pub fn new_tt_reader(sp_diag: @SpanHandler,
             None => RefCell::new(HashMap::new()),
             Some(x) => RefCell::new(x),
         },
-        repeat_idx: RefCell::new(~[]),
-        repeat_len: RefCell::new(~[]),
+        repeat_idx: RefCell::new(Vec::new()),
+        repeat_len: RefCell::new(Vec::new()),
         /* dummy values, never read: */
         cur_tok: RefCell::new(EOF),
         cur_span: RefCell::new(DUMMY_SP),
@@ -106,7 +107,7 @@ fn lookup_cur_matched_by_matched(r: &TtReader, start: @NamedMatch)
                 // end of the line; duplicate henceforth
                 ad
             }
-            MatchedSeq(ref ads, _) => ads[*idx]
+            MatchedSeq(ref ads, _) => *ads.get(*idx)
         }
     }
     let repeat_idx = r.repeat_idx.borrow();
@@ -217,7 +218,8 @@ pub fn tt_next_token(r: &TtReader) -> TokenAndSpan {
             r.stack.get().idx.set(0u);
             {
                 let mut repeat_idx = r.repeat_idx.borrow_mut();
-                repeat_idx.get()[repeat_idx.get().len() - 1u] += 1u;
+                let last_repeat_idx = repeat_idx.get().len() - 1u;
+                *repeat_idx.get().get_mut(last_repeat_idx) += 1u;
             }
             match r.stack.get().sep.clone() {
               Some(tk) => {
@@ -231,7 +233,7 @@ pub fn tt_next_token(r: &TtReader) -> TokenAndSpan {
     loop { /* because it's easiest, this handles `TTDelim` not starting
     with a `TTTok`, even though it won't happen */
         // FIXME(pcwalton): Bad copy.
-        match r.stack.get().forest[r.stack.get().idx.get()].clone() {
+        match (*r.stack.get().forest.get(r.stack.get().idx.get())).clone() {
           TTDelim(tts) => {
             r.stack.set(@TtFrame {
                 forest: tts,
diff --git a/src/libsyntax/fold.rs b/src/libsyntax/fold.rs
index e62abac443ebb..b01ba7718ba58 100644
--- a/src/libsyntax/fold.rs
+++ b/src/libsyntax/fold.rs
@@ -16,18 +16,20 @@ use parse::token;
 use opt_vec::OptVec;
 use util::small_vector::SmallVector;
 
+use std::vec_ng::Vec;
+
 // We may eventually want to be able to fold over type parameters, too.
 pub trait Folder {
     fn fold_crate(&mut self, c: Crate) -> Crate {
         noop_fold_crate(c, self)
     }
 
-    fn fold_meta_items(&mut self, meta_items: &[@MetaItem]) -> ~[@MetaItem] {
-        meta_items.map(|x| fold_meta_item_(*x, self))
+    fn fold_meta_items(&mut self, meta_items: &[@MetaItem]) -> Vec<@MetaItem> {
+        meta_items.iter().map(|x| fold_meta_item_(*x, self)).collect()
     }
 
-    fn fold_view_paths(&mut self, view_paths: &[@ViewPath]) -> ~[@ViewPath] {
-        view_paths.map(|view_path| {
+    fn fold_view_paths(&mut self, view_paths: &[@ViewPath]) -> Vec<@ViewPath> {
+        view_paths.iter().map(|view_path| {
             let inner_view_path = match view_path.node {
                 ViewPathSimple(ref ident, ref path, node_id) => {
                     ViewPathSimple(ident.clone(),
@@ -60,7 +62,7 @@ pub trait Folder {
                 node: inner_view_path,
                 span: self.new_span(view_path.span),
             }
-        })
+        }).collect()
     }
 
     fn fold_view_item(&mut self, vi: &ViewItem) -> ViewItem {
@@ -275,7 +277,7 @@ pub trait Folder {
             node: match macro.node {
                 MacInvocTT(ref p, ref tts, ctxt) => {
                     MacInvocTT(self.fold_path(p),
-                               fold_tts(*tts, self),
+                               fold_tts(tts.as_slice(), self),
                                ctxt)
                 }
             },
@@ -283,8 +285,8 @@ pub trait Folder {
         }
     }
 
-    fn map_exprs(&self, f: |@Expr| -> @Expr, es: &[@Expr]) -> ~[@Expr] {
-        es.map(|x| f(*x))
+    fn map_exprs(&self, f: |@Expr| -> @Expr, es: &[@Expr]) -> Vec<@Expr> {
+        es.iter().map(|x| f(*x)).collect()
     }
 
     fn new_id(&mut self, i: NodeId) -> NodeId {
@@ -370,21 +372,21 @@ fn fold_arg_<T: Folder>(a: &Arg, fld: &mut T) -> Arg {
 // since many token::IDENT are not necessary part of let bindings and most
 // token::LIFETIME are certainly not loop labels. But we can't tell in their
 // token form. So this is less ideal and hacky but it works.
-pub fn fold_tts<T: Folder>(tts: &[TokenTree], fld: &mut T) -> ~[TokenTree] {
-    tts.map(|tt| {
+pub fn fold_tts<T: Folder>(tts: &[TokenTree], fld: &mut T) -> Vec<TokenTree> {
+    tts.iter().map(|tt| {
         match *tt {
             TTTok(span, ref tok) =>
             TTTok(span,maybe_fold_ident(tok,fld)),
-            TTDelim(tts) => TTDelim(@fold_tts(*tts, fld)),
+            TTDelim(tts) => TTDelim(@fold_tts(tts.as_slice(), fld)),
             TTSeq(span, pattern, ref sep, is_optional) =>
             TTSeq(span,
-                  @fold_tts(*pattern, fld),
+                  @fold_tts(pattern.as_slice(), fld),
                   sep.as_ref().map(|tok|maybe_fold_ident(tok,fld)),
                   is_optional),
             TTNonterminal(sp,ref ident) =>
             TTNonterminal(sp,fld.fold_ident(*ident))
         }
-    })
+    }).collect()
 }
 
 // apply ident folder if it's an ident, otherwise leave it alone
@@ -518,7 +520,7 @@ pub fn noop_fold_view_item<T: Folder>(vi: &ViewItem, folder: &mut T)
                               folder.new_id(node_id))
         }
         ViewItemUse(ref view_paths) => {
-            ViewItemUse(folder.fold_view_paths(*view_paths))
+            ViewItemUse(folder.fold_view_paths(view_paths.as_slice()))
         }
     };
     ViewItem {
@@ -881,7 +883,7 @@ mod test {
     // this version doesn't care about getting comments or docstrings in.
     fn fake_print_crate(s: &mut pprust::State,
                         krate: &ast::Crate) -> io::IoResult<()> {
-        pprust::print_mod(s, &krate.module, krate.attrs)
+        pprust::print_mod(s, &krate.module, krate.attrs.as_slice())
     }
 
     // change every identifier to "zz"
diff --git a/src/libsyntax/opt_vec.rs b/src/libsyntax/opt_vec.rs
index 325df0ba77775..ec81fff51c791 100644
--- a/src/libsyntax/opt_vec.rs
+++ b/src/libsyntax/opt_vec.rs
@@ -15,20 +15,21 @@
  * other useful things like `push()` and `len()`.
  */
 
-use std::vec;
 use std::default::Default;
+use std::vec;
+use std::vec_ng::Vec;
 
 #[deriving(Clone, Encodable, Decodable, Hash)]
 pub enum OptVec<T> {
     Empty,
-    Vec(~[T])
+    Vec(Vec<T> )
 }
 
 pub fn with<T>(t: T) -> OptVec<T> {
-    Vec(~[t])
+    Vec(vec!(t))
 }
 
-pub fn from<T>(t: ~[T]) -> OptVec<T> {
+pub fn from<T>(t: Vec<T> ) -> OptVec<T> {
     if t.len() == 0 {
         Empty
     } else {
@@ -44,7 +45,7 @@ impl<T> OptVec<T> {
                 return;
             }
             Empty => {
-                *self = Vec(~[t]);
+                *self = Vec(vec!(t));
             }
         }
     }
@@ -87,7 +88,7 @@ impl<T> OptVec<T> {
     pub fn get<'a>(&'a self, i: uint) -> &'a T {
         match *self {
             Empty => fail!("invalid index {}", i),
-            Vec(ref v) => &v[i]
+            Vec(ref v) => v.get(i)
         }
     }
 
@@ -121,11 +122,11 @@ impl<T> OptVec<T> {
     }
 
     #[inline]
-    pub fn map_to_vec<B>(&self, op: |&T| -> B) -> ~[B] {
+    pub fn map_to_vec<B>(&self, op: |&T| -> B) -> Vec<B> {
         self.iter().map(op).collect()
     }
 
-    pub fn mapi_to_vec<B>(&self, op: |uint, &T| -> B) -> ~[B] {
+    pub fn mapi_to_vec<B>(&self, op: |uint, &T| -> B) -> Vec<B> {
         let mut index = 0;
         self.map_to_vec(|a| {
             let i = index;
@@ -135,19 +136,19 @@ impl<T> OptVec<T> {
     }
 }
 
-pub fn take_vec<T>(v: OptVec<T>) -> ~[T] {
+pub fn take_vec<T>(v: OptVec<T>) -> Vec<T> {
     match v {
-        Empty => ~[],
+        Empty => Vec::new(),
         Vec(v) => v
     }
 }
 
 impl<T:Clone> OptVec<T> {
     pub fn prepend(&self, t: T) -> OptVec<T> {
-        let mut v0 = ~[t];
+        let mut v0 = vec!(t);
         match *self {
             Empty => {}
-            Vec(ref v1) => { v0.push_all(*v1); }
+            Vec(ref v1) => { v0.push_all(v1.as_slice()); }
         }
         return Vec(v0);
     }
diff --git a/src/libsyntax/parse/attr.rs b/src/libsyntax/parse/attr.rs
index c9bea78d02db5..0a74c7ca82124 100644
--- a/src/libsyntax/parse/attr.rs
+++ b/src/libsyntax/parse/attr.rs
@@ -15,21 +15,23 @@ use parse::token;
 use parse::parser::Parser;
 use parse::token::INTERPOLATED;
 
+use std::vec_ng::Vec;
+
 // a parser that can parse attributes.
 pub trait ParserAttr {
-    fn parse_outer_attributes(&mut self) -> ~[ast::Attribute];
+    fn parse_outer_attributes(&mut self) -> Vec<ast::Attribute> ;
     fn parse_attribute(&mut self, permit_inner: bool) -> ast::Attribute;
     fn parse_inner_attrs_and_next(&mut self)
-                                  -> (~[ast::Attribute], ~[ast::Attribute]);
+                                  -> (Vec<ast::Attribute> , Vec<ast::Attribute> );
     fn parse_meta_item(&mut self) -> @ast::MetaItem;
-    fn parse_meta_seq(&mut self) -> ~[@ast::MetaItem];
-    fn parse_optional_meta(&mut self) -> ~[@ast::MetaItem];
+    fn parse_meta_seq(&mut self) -> Vec<@ast::MetaItem> ;
+    fn parse_optional_meta(&mut self) -> Vec<@ast::MetaItem> ;
 }
 
 impl ParserAttr for Parser {
     // Parse attributes that appear before an item
-    fn parse_outer_attributes(&mut self) -> ~[ast::Attribute] {
-        let mut attrs: ~[ast::Attribute] = ~[];
+    fn parse_outer_attributes(&mut self) -> Vec<ast::Attribute> {
+        let mut attrs: Vec<ast::Attribute> = Vec::new();
         loop {
             debug!("parse_outer_attributes: self.token={:?}",
                    self.token);
@@ -116,9 +118,9 @@ impl ParserAttr for Parser {
     // you can make the 'next' field an Option, but the result is going to be
     // more useful as a vector.
     fn parse_inner_attrs_and_next(&mut self)
-                                  -> (~[ast::Attribute], ~[ast::Attribute]) {
-        let mut inner_attrs: ~[ast::Attribute] = ~[];
-        let mut next_outer_attrs: ~[ast::Attribute] = ~[];
+                                  -> (Vec<ast::Attribute> , Vec<ast::Attribute> ) {
+        let mut inner_attrs: Vec<ast::Attribute> = Vec::new();
+        let mut next_outer_attrs: Vec<ast::Attribute> = Vec::new();
         loop {
             let attr = match self.token {
                 token::INTERPOLATED(token::NtAttr(..)) => {
@@ -188,17 +190,17 @@ impl ParserAttr for Parser {
     }
 
     // matches meta_seq = ( COMMASEP(meta_item) )
-    fn parse_meta_seq(&mut self) -> ~[@ast::MetaItem] {
+    fn parse_meta_seq(&mut self) -> Vec<@ast::MetaItem> {
         self.parse_seq(&token::LPAREN,
                        &token::RPAREN,
                        seq_sep_trailing_disallowed(token::COMMA),
                        |p| p.parse_meta_item()).node
     }
 
-    fn parse_optional_meta(&mut self) -> ~[@ast::MetaItem] {
+    fn parse_optional_meta(&mut self) -> Vec<@ast::MetaItem> {
         match self.token {
             token::LPAREN => self.parse_meta_seq(),
-            _ => ~[]
+            _ => Vec::new()
         }
     }
 }
diff --git a/src/libsyntax/parse/comments.rs b/src/libsyntax/parse/comments.rs
index bd1c4f9babb81..c2a2097de2442 100644
--- a/src/libsyntax/parse/comments.rs
+++ b/src/libsyntax/parse/comments.rs
@@ -20,6 +20,7 @@ use parse::token;
 use std::io;
 use std::str;
 use std::uint;
+use std::vec_ng::Vec;
 
 #[deriving(Clone, Eq)]
 pub enum CommentStyle {
@@ -32,7 +33,7 @@ pub enum CommentStyle {
 #[deriving(Clone)]
 pub struct Comment {
     style: CommentStyle,
-    lines: ~[~str],
+    lines: Vec<~str> ,
     pos: BytePos
 }
 
@@ -54,28 +55,28 @@ pub fn doc_comment_style(comment: &str) -> ast::AttrStyle {
 
 pub fn strip_doc_comment_decoration(comment: &str) -> ~str {
     /// remove whitespace-only lines from the start/end of lines
-    fn vertical_trim(lines: ~[~str]) -> ~[~str] {
+    fn vertical_trim(lines: Vec<~str> ) -> Vec<~str> {
         let mut i = 0u;
         let mut j = lines.len();
         // first line of all-stars should be omitted
-        if lines.len() > 0 && lines[0].chars().all(|c| c == '*') {
+        if lines.len() > 0 && lines.get(0).chars().all(|c| c == '*') {
             i += 1;
         }
-        while i < j && lines[i].trim().is_empty() {
+        while i < j && lines.get(i).trim().is_empty() {
             i += 1;
         }
         // like the first, a last line of all stars should be omitted
-        if j > i && lines[j - 1].chars().skip(1).all(|c| c == '*') {
+        if j > i && lines.get(j - 1).chars().skip(1).all(|c| c == '*') {
             j -= 1;
         }
-        while j > i && lines[j - 1].trim().is_empty() {
+        while j > i && lines.get(j - 1).trim().is_empty() {
             j -= 1;
         }
-        return lines.slice(i, j).to_owned();
+        return lines.slice(i, j).iter().map(|x| (*x).clone()).collect();
     }
 
     /// remove a "[ \t]*\*" block from each line, if possible
-    fn horizontal_trim(lines: ~[~str]) -> ~[~str] {
+    fn horizontal_trim(lines: Vec<~str> ) -> Vec<~str> {
         let mut i = uint::MAX;
         let mut can_trim = true;
         let mut first = true;
@@ -122,7 +123,7 @@ pub fn strip_doc_comment_decoration(comment: &str) -> ~str {
         let lines = comment.slice(3u, comment.len() - 2u)
             .lines_any()
             .map(|s| s.to_owned())
-            .collect::<~[~str]>();
+            .collect::<Vec<~str> >();
 
         let lines = vertical_trim(lines);
         let lines = horizontal_trim(lines);
@@ -157,9 +158,9 @@ fn consume_non_eol_whitespace(rdr: &StringReader) {
     }
 }
 
-fn push_blank_line_comment(rdr: &StringReader, comments: &mut ~[Comment]) {
+fn push_blank_line_comment(rdr: &StringReader, comments: &mut Vec<Comment> ) {
     debug!(">>> blank-line comment");
-    let v: ~[~str] = ~[];
+    let v: Vec<~str> = Vec::new();
     comments.push(Comment {
         style: BlankLine,
         lines: v,
@@ -168,7 +169,7 @@ fn push_blank_line_comment(rdr: &StringReader, comments: &mut ~[Comment]) {
 }
 
 fn consume_whitespace_counting_blank_lines(rdr: &StringReader,
-                                           comments: &mut ~[Comment]) {
+                                           comments: &mut Vec<Comment> ) {
     while is_whitespace(rdr.curr.get()) && !is_eof(rdr) {
         if rdr.col.get() == CharPos(0u) && rdr.curr_is('\n') {
             push_blank_line_comment(rdr, &mut *comments);
@@ -179,22 +180,22 @@ fn consume_whitespace_counting_blank_lines(rdr: &StringReader,
 
 
 fn read_shebang_comment(rdr: &StringReader, code_to_the_left: bool,
-                                            comments: &mut ~[Comment]) {
+                                            comments: &mut Vec<Comment> ) {
     debug!(">>> shebang comment");
     let p = rdr.last_pos.get();
     debug!("<<< shebang comment");
     comments.push(Comment {
         style: if code_to_the_left { Trailing } else { Isolated },
-        lines: ~[read_one_line_comment(rdr)],
+        lines: vec!(read_one_line_comment(rdr)),
         pos: p
     });
 }
 
 fn read_line_comments(rdr: &StringReader, code_to_the_left: bool,
-                                          comments: &mut ~[Comment]) {
+                                          comments: &mut Vec<Comment> ) {
     debug!(">>> line comments");
     let p = rdr.last_pos.get();
-    let mut lines: ~[~str] = ~[];
+    let mut lines: Vec<~str> = Vec::new();
     while rdr.curr_is('/') && nextch_is(rdr, '/') {
         let line = read_one_line_comment(rdr);
         debug!("{}", line);
@@ -232,7 +233,7 @@ fn all_whitespace(s: &str, col: CharPos) -> Option<uint> {
     return Some(cursor);
 }
 
-fn trim_whitespace_prefix_and_push_line(lines: &mut ~[~str],
+fn trim_whitespace_prefix_and_push_line(lines: &mut Vec<~str> ,
                                         s: ~str, col: CharPos) {
     let len = s.len();
     let s1 = match all_whitespace(s, col) {
@@ -249,10 +250,10 @@ fn trim_whitespace_prefix_and_push_line(lines: &mut ~[~str],
 
 fn read_block_comment(rdr: &StringReader,
                       code_to_the_left: bool,
-                      comments: &mut ~[Comment]) {
+                      comments: &mut Vec<Comment> ) {
     debug!(">>> block comment");
     let p = rdr.last_pos.get();
-    let mut lines: ~[~str] = ~[];
+    let mut lines: Vec<~str> = Vec::new();
     let col: CharPos = rdr.col.get();
     bump(rdr);
     bump(rdr);
@@ -324,7 +325,7 @@ fn peeking_at_comment(rdr: &StringReader) -> bool {
 
 fn consume_comment(rdr: &StringReader,
                    code_to_the_left: bool,
-                   comments: &mut ~[Comment]) {
+                   comments: &mut Vec<Comment> ) {
     debug!(">>> consume comment");
     if rdr.curr_is('/') && nextch_is(rdr, '/') {
         read_line_comments(rdr, code_to_the_left, comments);
@@ -348,15 +349,15 @@ pub fn gather_comments_and_literals(span_diagnostic:
                                         @diagnostic::SpanHandler,
                                     path: ~str,
                                     srdr: &mut io::Reader)
-                                 -> (~[Comment], ~[Literal]) {
+                                 -> (Vec<Comment> , Vec<Literal> ) {
     let src = srdr.read_to_end().unwrap();
     let src = str::from_utf8_owned(src).unwrap();
     let cm = CodeMap::new();
     let filemap = cm.new_filemap(path, src);
     let rdr = lexer::new_low_level_string_reader(span_diagnostic, filemap);
 
-    let mut comments: ~[Comment] = ~[];
-    let mut literals: ~[Literal] = ~[];
+    let mut comments: Vec<Comment> = Vec::new();
+    let mut literals: Vec<Literal> = Vec::new();
     let mut first_read: bool = true;
     while !is_eof(&rdr) {
         loop {
diff --git a/src/libsyntax/parse/lexer.rs b/src/libsyntax/parse/lexer.rs
index 87706df5e31d0..884fc306f22ea 100644
--- a/src/libsyntax/parse/lexer.rs
+++ b/src/libsyntax/parse/lexer.rs
@@ -1005,6 +1005,7 @@ mod test {
     use parse::token;
     use parse::token::{str_to_ident};
     use std::io::util;
+    use std::vec_ng::Vec;
 
     // represents a testing reader (incl. both reader and interner)
     struct Env {
@@ -1048,7 +1049,7 @@ mod test {
 
     // check that the given reader produces the desired stream
     // of tokens (stop checking after exhausting the expected vec)
-    fn check_tokenization (env: Env, expected: ~[token::Token]) {
+    fn check_tokenization (env: Env, expected: Vec<token::Token> ) {
         for expected_tok in expected.iter() {
             let TokenAndSpan {tok:actual_tok, sp: _} =
                 env.string_reader.next_token();
@@ -1064,32 +1065,32 @@ mod test {
     #[test] fn doublecolonparsing () {
         let env = setup (~"a b");
         check_tokenization (env,
-                           ~[mk_ident("a",false),
-                             mk_ident("b",false)]);
+                           vec!(mk_ident("a",false),
+                             mk_ident("b",false)));
     }
 
     #[test] fn dcparsing_2 () {
         let env = setup (~"a::b");
         check_tokenization (env,
-                           ~[mk_ident("a",true),
+                           vec!(mk_ident("a",true),
                              token::MOD_SEP,
-                             mk_ident("b",false)]);
+                             mk_ident("b",false)));
     }
 
     #[test] fn dcparsing_3 () {
         let env = setup (~"a ::b");
         check_tokenization (env,
-                           ~[mk_ident("a",false),
+                           vec!(mk_ident("a",false),
                              token::MOD_SEP,
-                             mk_ident("b",false)]);
+                             mk_ident("b",false)));
     }
 
     #[test] fn dcparsing_4 () {
         let env = setup (~"a:: b");
         check_tokenization (env,
-                           ~[mk_ident("a",true),
+                           vec!(mk_ident("a",true),
                              token::MOD_SEP,
-                             mk_ident("b",false)]);
+                             mk_ident("b",false)));
     }
 
     #[test] fn character_a() {
diff --git a/src/libsyntax/parse/mod.rs b/src/libsyntax/parse/mod.rs
index 8f45f91148453..9e5db1770bf31 100644
--- a/src/libsyntax/parse/mod.rs
+++ b/src/libsyntax/parse/mod.rs
@@ -21,6 +21,7 @@ use parse::parser::Parser;
 use std::cell::RefCell;
 use std::io::File;
 use std::str;
+use std::vec_ng::Vec;
 
 pub mod lexer;
 pub mod parser;
@@ -42,7 +43,7 @@ pub struct ParseSess {
     cm: @codemap::CodeMap, // better be the same as the one in the reader!
     span_diagnostic: @SpanHandler, // better be the same as the one in the reader!
     /// Used to determine and report recursive mod inclusions
-    included_mod_stack: RefCell<~[Path]>,
+    included_mod_stack: RefCell<Vec<Path> >,
 }
 
 pub fn new_parse_sess() -> @ParseSess {
@@ -50,7 +51,7 @@ pub fn new_parse_sess() -> @ParseSess {
     @ParseSess {
         cm: cm,
         span_diagnostic: mk_span_handler(default_handler(), cm),
-        included_mod_stack: RefCell::new(~[]),
+        included_mod_stack: RefCell::new(Vec::new()),
     }
 }
 
@@ -60,7 +61,7 @@ pub fn new_parse_sess_special_handler(sh: @SpanHandler,
     @ParseSess {
         cm: cm,
         span_diagnostic: sh,
-        included_mod_stack: RefCell::new(~[]),
+        included_mod_stack: RefCell::new(Vec::new()),
     }
 }
 
@@ -82,7 +83,7 @@ pub fn parse_crate_attrs_from_file(
     input: &Path,
     cfg: ast::CrateConfig,
     sess: @ParseSess
-) -> ~[ast::Attribute] {
+) -> Vec<ast::Attribute> {
     let mut parser = new_parser_from_file(sess, cfg, input);
     let (inner, _) = parser.parse_inner_attrs_and_next();
     return inner;
@@ -104,7 +105,7 @@ pub fn parse_crate_attrs_from_source_str(name: ~str,
                                          source: ~str,
                                          cfg: ast::CrateConfig,
                                          sess: @ParseSess)
-                                         -> ~[ast::Attribute] {
+                                         -> Vec<ast::Attribute> {
     let mut p = new_parser_from_source_str(sess,
                                            cfg,
                                            name,
@@ -144,7 +145,7 @@ pub fn parse_meta_from_source_str(name: ~str,
 pub fn parse_stmt_from_source_str(name: ~str,
                                   source: ~str,
                                   cfg: ast::CrateConfig,
-                                  attrs: ~[ast::Attribute],
+                                  attrs: Vec<ast::Attribute> ,
                                   sess: @ParseSess)
                                   -> @ast::Stmt {
     let mut p = new_parser_from_source_str(
@@ -160,7 +161,7 @@ pub fn parse_tts_from_source_str(name: ~str,
                                  source: ~str,
                                  cfg: ast::CrateConfig,
                                  sess: @ParseSess)
-                                 -> ~[ast::TokenTree] {
+                                 -> Vec<ast::TokenTree> {
     let mut p = new_parser_from_source_str(
         sess,
         cfg,
@@ -214,7 +215,7 @@ pub fn filemap_to_parser(sess: @ParseSess,
 // compiler expands into it
 pub fn new_parser_from_tts(sess: @ParseSess,
                      cfg: ast::CrateConfig,
-                     tts: ~[ast::TokenTree]) -> Parser {
+                     tts: Vec<ast::TokenTree> ) -> Parser {
     tts_to_parser(sess,tts,cfg)
 }
 
@@ -256,10 +257,10 @@ pub fn string_to_filemap(sess: @ParseSess, source: ~str, path: ~str)
 
 // given a filemap, produce a sequence of token-trees
 pub fn filemap_to_tts(sess: @ParseSess, filemap: @FileMap)
-    -> ~[ast::TokenTree] {
+    -> Vec<ast::TokenTree> {
     // it appears to me that the cfg doesn't matter here... indeed,
     // parsing tt's probably shouldn't require a parser at all.
-    let cfg = ~[];
+    let cfg = Vec::new();
     let srdr = lexer::new_string_reader(sess.span_diagnostic, filemap);
     let mut p1 = Parser(sess, cfg, ~srdr);
     p1.parse_all_token_trees()
@@ -267,7 +268,7 @@ pub fn filemap_to_tts(sess: @ParseSess, filemap: @FileMap)
 
 // given tts and cfg, produce a parser
 pub fn tts_to_parser(sess: @ParseSess,
-                     tts: ~[ast::TokenTree],
+                     tts: Vec<ast::TokenTree> ,
                      cfg: ast::CrateConfig) -> Parser {
     let trdr = lexer::new_tt_reader(sess.span_diagnostic, None, tts);
     Parser(sess, cfg, ~trdr)
@@ -288,6 +289,7 @@ mod test {
     use std::io;
     use std::io::MemWriter;
     use std::str;
+    use std::vec_ng::Vec;
     use codemap::{Span, BytePos, Spanned};
     use opt_vec;
     use ast;
@@ -318,13 +320,13 @@ mod test {
                     node: ast::ExprPath(ast::Path {
                         span: sp(0, 1),
                         global: false,
-                        segments: ~[
+                        segments: vec!(
                             ast::PathSegment {
                                 identifier: str_to_ident("a"),
                                 lifetimes: opt_vec::Empty,
                                 types: opt_vec::Empty,
                             }
-                        ],
+                        ),
                     }),
                     span: sp(0, 1)
                    })
@@ -337,7 +339,7 @@ mod test {
                     node: ast::ExprPath(ast::Path {
                             span: sp(0, 6),
                             global: true,
-                            segments: ~[
+                            segments: vec!(
                                 ast::PathSegment {
                                     identifier: str_to_ident("a"),
                                     lifetimes: opt_vec::Empty,
@@ -348,7 +350,7 @@ mod test {
                                     lifetimes: opt_vec::Empty,
                                     types: opt_vec::Empty,
                                 }
-                            ]
+                            )
                         }),
                     span: sp(0, 6)
                    })
@@ -362,27 +364,28 @@ mod test {
     // check the token-tree-ization of macros
     #[test] fn string_to_tts_macro () {
         let tts = string_to_tts(~"macro_rules! zip (($a)=>($a))");
-        let tts: &[ast::TokenTree] = tts;
+        let tts: &[ast::TokenTree] = tts.as_slice();
         match tts {
             [ast::TTTok(_,_),
              ast::TTTok(_,token::NOT),
              ast::TTTok(_,_),
              ast::TTDelim(delim_elts)] => {
-                let delim_elts: &[ast::TokenTree] = *delim_elts;
+                let delim_elts: &[ast::TokenTree] = delim_elts.as_slice();
                 match delim_elts {
                     [ast::TTTok(_,token::LPAREN),
                      ast::TTDelim(first_set),
                      ast::TTTok(_,token::FAT_ARROW),
                      ast::TTDelim(second_set),
                      ast::TTTok(_,token::RPAREN)] => {
-                        let first_set: &[ast::TokenTree] = *first_set;
+                        let first_set: &[ast::TokenTree] =
+                            first_set.as_slice();
                         match first_set {
                             [ast::TTTok(_,token::LPAREN),
                              ast::TTTok(_,token::DOLLAR),
                              ast::TTTok(_,_),
                              ast::TTTok(_,token::RPAREN)] => {
                                 let second_set: &[ast::TokenTree] =
-                                    *second_set;
+                                    second_set.as_slice();
                                 match second_set {
                                     [ast::TTTok(_,token::LPAREN),
                                      ast::TTTok(_,token::DOLLAR),
@@ -550,13 +553,13 @@ mod test {
                         node:ast::ExprPath(ast::Path{
                             span: sp(7, 8),
                             global: false,
-                            segments: ~[
+                            segments: vec!(
                                 ast::PathSegment {
                                     identifier: str_to_ident("d"),
                                     lifetimes: opt_vec::Empty,
                                     types: opt_vec::Empty,
                                 }
-                            ],
+                            ),
                         }),
                         span:sp(7,8)
                     })),
@@ -572,13 +575,13 @@ mod test {
                            node: ast::ExprPath(ast::Path {
                                span:sp(0,1),
                                global:false,
-                               segments: ~[
+                               segments: vec!(
                                 ast::PathSegment {
                                     identifier: str_to_ident("b"),
                                     lifetimes: opt_vec::Empty,
                                     types: opt_vec::Empty,
                                 }
-                               ],
+                               ),
                             }),
                            span: sp(0,1)},
                                            ast::DUMMY_NODE_ID),
@@ -599,13 +602,13 @@ mod test {
                                 ast::Path {
                                     span:sp(0,1),
                                     global:false,
-                                    segments: ~[
+                                    segments: vec!(
                                         ast::PathSegment {
                                             identifier: str_to_ident("b"),
                                             lifetimes: opt_vec::Empty,
                                             types: opt_vec::Empty,
                                         }
-                                    ],
+                                    ),
                                 },
                                 None /* no idea */),
                              span: sp(0,1)});
@@ -618,22 +621,22 @@ mod test {
         assert!(string_to_item(~"fn a (b : int) { b; }") ==
                   Some(
                       @ast::Item{ident:str_to_ident("a"),
-                            attrs:~[],
+                            attrs:Vec::new(),
                             id: ast::DUMMY_NODE_ID,
                             node: ast::ItemFn(ast::P(ast::FnDecl {
-                                inputs: ~[ast::Arg{
+                                inputs: vec!(ast::Arg{
                                     ty: ast::P(ast::Ty{id: ast::DUMMY_NODE_ID,
                                                        node: ast::TyPath(ast::Path{
                                         span:sp(10,13),
                                         global:false,
-                                        segments: ~[
+                                        segments: vec!(
                                             ast::PathSegment {
                                                 identifier:
                                                     str_to_ident("int"),
                                                 lifetimes: opt_vec::Empty,
                                                 types: opt_vec::Empty,
                                             }
-                                        ],
+                                        ),
                                         }, None, ast::DUMMY_NODE_ID),
                                         span:sp(10,13)
                                     }),
@@ -644,21 +647,21 @@ mod test {
                                             ast::Path {
                                                 span:sp(6,7),
                                                 global:false,
-                                                segments: ~[
+                                                segments: vec!(
                                                     ast::PathSegment {
                                                         identifier:
                                                             str_to_ident("b"),
                                                         lifetimes: opt_vec::Empty,
                                                         types: opt_vec::Empty,
                                                     }
-                                                ],
+                                                ),
                                             },
                                             None // no idea
                                         ),
                                         span: sp(6,7)
                                     },
                                     id: ast::DUMMY_NODE_ID
-                                }],
+                                }),
                                 output: ast::P(ast::Ty{id: ast::DUMMY_NODE_ID,
                                                        node: ast::TyNil,
                                                        span:sp(15,15)}), // not sure
@@ -672,15 +675,15 @@ mod test {
                                         ty_params: opt_vec::Empty,
                                     },
                                     ast::P(ast::Block {
-                                        view_items: ~[],
-                                        stmts: ~[@Spanned{
+                                        view_items: Vec::new(),
+                                        stmts: vec!(@Spanned{
                                             node: ast::StmtSemi(@ast::Expr{
                                                 id: ast::DUMMY_NODE_ID,
                                                 node: ast::ExprPath(
                                                       ast::Path{
                                                         span:sp(17,18),
                                                         global:false,
-                                                        segments: ~[
+                                                        segments: vec!(
                                                             ast::PathSegment {
                                                                 identifier:
                                                                 str_to_ident(
@@ -690,11 +693,11 @@ mod test {
                                                                 types:
                                                                 opt_vec::Empty
                                                             }
-                                                        ],
+                                                        ),
                                                       }),
                                                 span: sp(17,18)},
                                                 ast::DUMMY_NODE_ID),
-                                            span: sp(17,18)}],
+                                            span: sp(17,18)}),
                                         expr: None,
                                         id: ast::DUMMY_NODE_ID,
                                         rules: ast::DefaultBlock, // no idea
diff --git a/src/libsyntax/parse/parser.rs b/src/libsyntax/parse/parser.rs
index 2fd6d34adf195..9b209aadf19e5 100644
--- a/src/libsyntax/parse/parser.rs
+++ b/src/libsyntax/parse/parser.rs
@@ -82,7 +82,8 @@ use std::cell::Cell;
 use collections::HashSet;
 use std::kinds::marker;
 use std::mem::replace;
-use std::vec;
+use std::vec_ng::Vec;
+use std::vec_ng;
 
 #[allow(non_camel_case_types)]
 #[deriving(Eq)]
@@ -93,7 +94,7 @@ enum restriction {
     RESTRICT_NO_BAR_OR_DOUBLEBAR_OP,
 }
 
-type ItemInfo = (Ident, Item_, Option<~[Attribute]>);
+type ItemInfo = (Ident, Item_, Option<Vec<Attribute> >);
 
 /// How to parse a path. There are four different kinds of paths, all of which
 /// are parsed somewhat differently.
@@ -129,7 +130,7 @@ pub struct PathAndBounds {
 enum ItemOrViewItem {
     // Indicates a failure to parse any kind of item. The attributes are
     // returned.
-    IoviNone(~[Attribute]),
+    IoviNone(Vec<Attribute> ),
     IoviItem(@Item),
     IoviForeignItem(@ForeignItem),
     IoviViewItem(ViewItem)
@@ -257,7 +258,7 @@ macro_rules! maybe_whole (
             };
             match __found__ {
                 Some(INTERPOLATED(token::$constructor(x))) => {
-                    return (~[], x)
+                    return (Vec::new(), x)
                 }
                 _ => {}
             }
@@ -266,21 +267,20 @@ macro_rules! maybe_whole (
 )
 
 
-fn maybe_append(lhs: ~[Attribute], rhs: Option<~[Attribute]>)
-             -> ~[Attribute] {
+fn maybe_append(lhs: Vec<Attribute> , rhs: Option<Vec<Attribute> >)
+             -> Vec<Attribute> {
     match rhs {
         None => lhs,
-        Some(ref attrs) => vec::append(lhs, (*attrs))
+        Some(ref attrs) => vec_ng::append(lhs, attrs.as_slice())
     }
 }
 
 
 struct ParsedItemsAndViewItems {
-    attrs_remaining: ~[Attribute],
-    view_items: ~[ViewItem],
-    items: ~[@Item],
-    foreign_items: ~[@ForeignItem]
-}
+    attrs_remaining: Vec<Attribute> ,
+    view_items: Vec<ViewItem> ,
+    items: Vec<@Item> ,
+    foreign_items: Vec<@ForeignItem> }
 
 /* ident is handled by common.rs */
 
@@ -314,8 +314,8 @@ pub fn Parser(sess: @ParseSess, cfg: ast::CrateConfig, rdr: ~Reader:)
         restriction: UNRESTRICTED,
         quote_depth: 0,
         obsolete_set: HashSet::new(),
-        mod_path_stack: ~[],
-        open_braces: ~[],
+        mod_path_stack: Vec::new(),
+        open_braces: Vec::new(),
         nopod: marker::NoPod
     }
 }
@@ -343,9 +343,9 @@ pub struct Parser {
     /// extra detail when the same error is seen twice
     obsolete_set: HashSet<ObsoleteSyntax>,
     /// Used to determine the path to externally loaded source files
-    mod_path_stack: ~[InternedString],
+    mod_path_stack: Vec<InternedString> ,
     /// Stack of spans of open delimiters. Used for error message.
-    open_braces: ~[Span],
+    open_braces: Vec<Span> ,
     /* do not copy the parser; its state is tied to outside state */
     priv nopod: marker::NoPod
 }
@@ -407,8 +407,11 @@ impl Parser {
         } else if inedible.contains(&self.token) {
             // leave it in the input
         } else {
-            let expected = vec::append(edible.to_owned(), inedible);
-            let expect = tokens_to_str(expected);
+            let expected = vec_ng::append(edible.iter()
+                                                .map(|x| (*x).clone())
+                                                .collect(),
+                                          inedible);
+            let expect = tokens_to_str(expected.as_slice());
             let actual = self.this_token_to_str();
             self.fatal(
                 if expected.len() != 1 {
@@ -446,8 +449,12 @@ impl Parser {
         match e.node {
             ExprPath(..) => {
                 // might be unit-struct construction; check for recoverableinput error.
-                let expected = vec::append(edible.to_owned(), inedible);
-                self.check_for_erroneous_unit_struct_expecting(expected);
+                let expected = vec_ng::append(edible.iter()
+                                                    .map(|x| (*x).clone())
+                                                    .collect(),
+                                              inedible);
+                self.check_for_erroneous_unit_struct_expecting(
+                    expected.as_slice());
             }
             _ => {}
         }
@@ -465,8 +472,12 @@ impl Parser {
         debug!("commit_stmt {:?}", s);
         let _s = s; // unused, but future checks might want to inspect `s`.
         if self.last_token.as_ref().map_or(false, |t| is_ident_or_path(*t)) {
-            let expected = vec::append(edible.to_owned(), inedible);
-            self.check_for_erroneous_unit_struct_expecting(expected);
+            let expected = vec_ng::append(edible.iter()
+                                                .map(|x| (*x).clone())
+                                                .collect(),
+                                          inedible.as_slice());
+            self.check_for_erroneous_unit_struct_expecting(
+                expected.as_slice());
         }
         self.expect_one_of(edible, inedible)
     }
@@ -578,9 +589,9 @@ impl Parser {
                               &mut self,
                               sep: &token::Token,
                               f: |&mut Parser| -> T)
-                              -> ~[T] {
+                              -> Vec<T> {
         let mut first = true;
-        let mut vector = ~[];
+        let mut vector = Vec::new();
         while self.token != token::BINOP(token::OR) &&
                 self.token != token::OROR {
             if first {
@@ -655,7 +666,7 @@ impl Parser {
                             ket: &token::Token,
                             sep: SeqSep,
                             f: |&mut Parser| -> T)
-                            -> ~[T] {
+                            -> Vec<T> {
         let val = self.parse_seq_to_before_end(ket, sep, f);
         self.bump();
         val
@@ -669,9 +680,9 @@ impl Parser {
                                    ket: &token::Token,
                                    sep: SeqSep,
                                    f: |&mut Parser| -> T)
-                                   -> ~[T] {
+                                   -> Vec<T> {
         let mut first: bool = true;
-        let mut v: ~[T] = ~[];
+        let mut v: Vec<T> = Vec::new();
         while self.token != *ket {
             match sep.sep {
               Some(ref t) => {
@@ -695,7 +706,7 @@ impl Parser {
                                ket: &token::Token,
                                sep: SeqSep,
                                f: |&mut Parser| -> T)
-                               -> ~[T] {
+                               -> Vec<T> {
         self.expect(bra);
         let result = self.parse_seq_to_before_end(ket, sep, f);
         self.bump();
@@ -710,7 +721,7 @@ impl Parser {
                      ket: &token::Token,
                      sep: SeqSep,
                      f: |&mut Parser| -> T)
-                     -> Spanned<~[T]> {
+                     -> Spanned<Vec<T> > {
         let lo = self.span.lo;
         self.expect(bra);
         let result = self.parse_seq_to_before_end(ket, sep, f);
@@ -950,7 +961,7 @@ impl Parser {
                 };
 
                 let inputs = if self.eat(&token::OROR) {
-                    ~[]
+                    Vec::new()
                 } else {
                     self.expect_or();
                     let inputs = self.parse_seq_to_before_or(
@@ -1034,7 +1045,7 @@ impl Parser {
     }
 
     // parse the methods in a trait declaration
-    pub fn parse_trait_methods(&mut self) -> ~[TraitMethod] {
+    pub fn parse_trait_methods(&mut self) -> Vec<TraitMethod> {
         self.parse_unspanned_seq(
             &token::LBRACE,
             &token::RBRACE,
@@ -1083,7 +1094,7 @@ impl Parser {
                 debug!("parse_trait_methods(): parsing provided method");
                 let (inner_attrs, body) =
                     p.parse_inner_attrs_and_block();
-                let attrs = vec::append(attrs, inner_attrs);
+                let attrs = vec_ng::append(attrs, inner_attrs.as_slice());
                 Provided(@ast::Method {
                     ident: ident,
                     attrs: attrs,
@@ -1176,7 +1187,7 @@ impl Parser {
                 // (t) is a parenthesized ty
                 // (t,) is the type of a tuple with only one field,
                 // of type t
-                let mut ts = ~[self.parse_ty(false)];
+                let mut ts = vec!(self.parse_ty(false));
                 let mut one_tuple = false;
                 while self.token == token::COMMA {
                     self.bump();
@@ -1190,7 +1201,7 @@ impl Parser {
 
                 if ts.len() == 1 && !one_tuple {
                     self.expect(&token::RPAREN);
-                    return ts[0]
+                    return *ts.get(0)
                 }
 
                 let t = TyTup(ts);
@@ -1479,7 +1490,7 @@ impl Parser {
         // Parse any number of segments and bound sets. A segment is an
         // identifier followed by an optional lifetime and a set of types.
         // A bound set is a set of type parameter bounds.
-        let mut segments = ~[];
+        let mut segments = Vec::new();
         loop {
             // First, parse an identifier.
             let identifier = self.parse_ident();
@@ -1541,7 +1552,7 @@ impl Parser {
         let span = mk_sp(lo, self.last_span.hi);
 
         // Assemble the path segments.
-        let mut path_segments = ~[];
+        let mut path_segments = Vec::new();
         let mut bounds = None;
         let last_segment_index = segments.len() - 1;
         for (i, segment_and_bounds) in segments.move_iter().enumerate() {
@@ -1690,11 +1701,11 @@ impl Parser {
         ExprBinary(binop, lhs, rhs)
     }
 
-    pub fn mk_call(&mut self, f: @Expr, args: ~[@Expr]) -> ast::Expr_ {
+    pub fn mk_call(&mut self, f: @Expr, args: Vec<@Expr> ) -> ast::Expr_ {
         ExprCall(f, args)
     }
 
-    fn mk_method_call(&mut self, ident: Ident, tps: ~[P<Ty>], args: ~[@Expr]) -> ast::Expr_ {
+    fn mk_method_call(&mut self, ident: Ident, tps: Vec<P<Ty>> , args: Vec<@Expr> ) -> ast::Expr_ {
         ExprMethodCall(ident, tps, args)
     }
 
@@ -1702,7 +1713,7 @@ impl Parser {
         ExprIndex(expr, idx)
     }
 
-    pub fn mk_field(&mut self, expr: @Expr, ident: Ident, tys: ~[P<Ty>]) -> ast::Expr_ {
+    pub fn mk_field(&mut self, expr: @Expr, ident: Ident, tys: Vec<P<Ty>> ) -> ast::Expr_ {
         ExprField(expr, ident, tys)
     }
 
@@ -1754,7 +1765,7 @@ impl Parser {
                 let lit = @spanned(lo, hi, LitNil);
                 return self.mk_expr(lo, hi, ExprLit(lit));
             }
-            let mut es = ~[self.parse_expr()];
+            let mut es = vec!(self.parse_expr());
             self.commit_expr(*es.last().unwrap(), &[], &[token::COMMA, token::RPAREN]);
             while self.token == token::COMMA {
                 self.bump();
@@ -1770,7 +1781,7 @@ impl Parser {
             self.commit_expr_expecting(*es.last().unwrap(), token::RPAREN);
 
             return if es.len() == 1 && !trailing_comma {
-                self.mk_expr(lo, hi, ExprParen(es[0]))
+                self.mk_expr(lo, hi, ExprParen(*es.get(0)))
             }
             else {
                 self.mk_expr(lo, hi, ExprTup(es))
@@ -1786,8 +1797,8 @@ impl Parser {
             let decl = self.parse_proc_decl();
             let body = self.parse_expr();
             let fakeblock = P(ast::Block {
-                view_items: ~[],
-                stmts: ~[],
+                view_items: Vec::new(),
+                stmts: Vec::new(),
                 expr: Some(body),
                 id: ast::DUMMY_NODE_ID,
                 rules: DefaultBlock,
@@ -1840,7 +1851,7 @@ impl Parser {
             if self.token == token::RBRACKET {
                 // Empty vector.
                 self.bump();
-                ex = ExprVec(~[], mutbl);
+                ex = ExprVec(Vec::new(), mutbl);
             } else {
                 // Nonempty vector.
                 let first_expr = self.parse_expr();
@@ -1860,11 +1871,13 @@ impl Parser {
                         seq_sep_trailing_allowed(token::COMMA),
                         |p| p.parse_expr()
                     );
-                    ex = ExprVec(~[first_expr] + remaining_exprs, mutbl);
+                    let mut exprs = vec!(first_expr);
+                    exprs.push_all_move(remaining_exprs);
+                    ex = ExprVec(exprs, mutbl);
                 } else {
                     // Vector with one element.
                     self.expect(&token::RBRACKET);
-                    ex = ExprVec(~[first_expr], mutbl);
+                    ex = ExprVec(vec!(first_expr), mutbl);
                 }
             }
             hi = self.last_span.hi;
@@ -1919,7 +1932,7 @@ impl Parser {
                 if self.looking_at_struct_literal() {
                     // It's a struct literal.
                     self.bump();
-                    let mut fields = ~[];
+                    let mut fields = Vec::new();
                     let mut base = None;
 
                     while self.token != token::RBRACE {
@@ -1981,7 +1994,7 @@ impl Parser {
                         self.expect(&token::LT);
                         self.parse_generic_values_after_lt()
                     } else {
-                        (opt_vec::Empty, ~[])
+                        (opt_vec::Empty, Vec::new())
                     };
 
                     // expr.f() method call
@@ -2143,7 +2156,7 @@ impl Parser {
 
                 // Parse the open delimiter.
                 self.open_braces.push(self.span);
-                let mut result = ~[parse_any_tt_tok(self)];
+                let mut result = vec!(parse_any_tt_tok(self));
 
                 let trees =
                     self.parse_seq_to_before_end(&close_delim,
@@ -2163,15 +2176,15 @@ impl Parser {
 
     // parse a stream of tokens into a list of TokenTree's,
     // up to EOF.
-    pub fn parse_all_token_trees(&mut self) -> ~[TokenTree] {
-        let mut tts = ~[];
+    pub fn parse_all_token_trees(&mut self) -> Vec<TokenTree> {
+        let mut tts = Vec::new();
         while self.token != token::EOF {
             tts.push(self.parse_token_tree());
         }
         tts
     }
 
-    pub fn parse_matchers(&mut self) -> ~[Matcher] {
+    pub fn parse_matchers(&mut self) -> Vec<Matcher> {
         // unification of Matcher's and TokenTree's would vastly improve
         // the interpolation of Matcher's
         maybe_whole!(self, NtMatchers);
@@ -2192,8 +2205,8 @@ impl Parser {
     pub fn parse_matcher_subseq_upto(&mut self,
                                      name_idx: @Cell<uint>,
                                      ket: &token::Token)
-                                     -> ~[Matcher] {
-        let mut ret_val = ~[];
+                                     -> Vec<Matcher> {
+        let mut ret_val = Vec::new();
         let mut lparens = 0u;
 
         while self.token != *ket || lparens > 0u {
@@ -2478,7 +2491,7 @@ impl Parser {
                     _ => {
                         // No argument list - `do foo {`
                         P(FnDecl {
-                            inputs: ~[],
+                            inputs: Vec::new(),
                             output: P(Ty {
                                 id: ast::DUMMY_NODE_ID,
                                 node: TyInfer,
@@ -2513,8 +2526,8 @@ impl Parser {
         let decl = parse_decl(self);
         let body = parse_body(self);
         let fakeblock = P(ast::Block {
-            view_items: ~[],
-            stmts: ~[],
+            view_items: Vec::new(),
+            stmts: Vec::new(),
             expr: Some(body),
             id: ast::DUMMY_NODE_ID,
             rules: DefaultBlock,
@@ -2601,7 +2614,7 @@ impl Parser {
         let lo = self.last_span.lo;
         let discriminant = self.parse_expr();
         self.commit_expr_expecting(discriminant, token::LBRACE);
-        let mut arms: ~[Arm] = ~[];
+        let mut arms: Vec<Arm> = Vec::new();
         while self.token != token::RBRACE {
             let pats = self.parse_pats();
             let mut guard = None;
@@ -2622,8 +2635,8 @@ impl Parser {
             }
 
             let blk = P(ast::Block {
-                view_items: ~[],
-                stmts: ~[],
+                view_items: Vec::new(),
+                stmts: Vec::new(),
                 expr: Some(expr),
                 id: ast::DUMMY_NODE_ID,
                 rules: DefaultBlock,
@@ -2662,8 +2675,8 @@ impl Parser {
     }
 
     // parse patterns, separated by '|' s
-    fn parse_pats(&mut self) -> ~[@Pat] {
-        let mut pats = ~[];
+    fn parse_pats(&mut self) -> Vec<@Pat> {
+        let mut pats = Vec::new();
         loop {
             pats.push(self.parse_pat());
             if self.token == token::BINOP(token::OR) { self.bump(); }
@@ -2673,10 +2686,10 @@ impl Parser {
 
     fn parse_pat_vec_elements(
         &mut self,
-    ) -> (~[@Pat], Option<@Pat>, ~[@Pat]) {
-        let mut before = ~[];
+    ) -> (Vec<@Pat> , Option<@Pat>, Vec<@Pat> ) {
+        let mut before = Vec::new();
         let mut slice = None;
-        let mut after = ~[];
+        let mut after = Vec::new();
         let mut first = true;
         let mut before_slice = true;
 
@@ -2733,8 +2746,8 @@ impl Parser {
     }
 
     // parse the fields of a struct-like pattern
-    fn parse_pat_fields(&mut self) -> (~[ast::FieldPat], bool) {
-        let mut fields = ~[];
+    fn parse_pat_fields(&mut self) -> (Vec<ast::FieldPat> , bool) {
+        let mut fields = Vec::new();
         let mut etc = false;
         let mut first = true;
         while self.token != token::RBRACE {
@@ -2900,7 +2913,7 @@ impl Parser {
                 let expr = self.mk_expr(lo, hi, ExprLit(lit));
                 pat = PatLit(expr);
             } else {
-                let mut fields = ~[self.parse_pat()];
+                let mut fields = vec!(self.parse_pat());
                 if self.look_ahead(1, |t| *t != token::RPAREN) {
                     while self.token == token::COMMA {
                         self.bump();
@@ -3002,7 +3015,7 @@ impl Parser {
                         pat = PatStruct(enum_path, fields, etc);
                     }
                     _ => {
-                        let mut args: ~[@Pat] = ~[];
+                        let mut args: Vec<@Pat> = Vec::new();
                         match self.token {
                           token::LPAREN => {
                             let is_star = self.look_ahead(1, |t| {
@@ -3128,7 +3141,7 @@ impl Parser {
 
     // parse a structure field
     fn parse_name_and_ty(&mut self, pr: Visibility,
-                         attrs: ~[Attribute]) -> StructField {
+                         attrs: Vec<Attribute> ) -> StructField {
         let lo = self.span.lo;
         if !is_plain_ident(&self.token) {
             self.fatal("expected ident");
@@ -3146,7 +3159,7 @@ impl Parser {
 
     // parse a statement. may include decl.
     // precondition: any attributes are parsed already
-    pub fn parse_stmt(&mut self, item_attrs: ~[Attribute]) -> @Stmt {
+    pub fn parse_stmt(&mut self, item_attrs: Vec<Attribute> ) -> @Stmt {
         maybe_whole!(self, NtStmt);
 
         fn check_expected_item(p: &mut Parser, found_attrs: bool) {
@@ -3229,7 +3242,7 @@ impl Parser {
                         self.mk_item(
                             lo, hi, id /*id is good here*/,
                             ItemMac(spanned(lo, hi, MacInvocTT(pth, tts, EMPTY_CTXT))),
-                            Inherited, ~[/*no attrs*/]))),
+                            Inherited, Vec::new(/*no attrs*/)))),
                     ast::DUMMY_NODE_ID));
             }
 
@@ -3275,12 +3288,12 @@ impl Parser {
         }
         self.expect(&token::LBRACE);
 
-        return self.parse_block_tail_(lo, DefaultBlock, ~[]);
+        return self.parse_block_tail_(lo, DefaultBlock, Vec::new());
     }
 
     // parse a block. Inner attrs are allowed.
     fn parse_inner_attrs_and_block(&mut self)
-        -> (~[Attribute], P<Block>) {
+        -> (Vec<Attribute> , P<Block>) {
 
         maybe_whole!(pair_empty self, NtBlock);
 
@@ -3299,13 +3312,13 @@ impl Parser {
     // necessary, and this should take a qualifier.
     // some blocks start with "#{"...
     fn parse_block_tail(&mut self, lo: BytePos, s: BlockCheckMode) -> P<Block> {
-        self.parse_block_tail_(lo, s, ~[])
+        self.parse_block_tail_(lo, s, Vec::new())
     }
 
     // parse the rest of a block expression or function body
     fn parse_block_tail_(&mut self, lo: BytePos, s: BlockCheckMode,
-                         first_item_attrs: ~[Attribute]) -> P<Block> {
-        let mut stmts = ~[];
+                         first_item_attrs: Vec<Attribute> ) -> P<Block> {
+        let mut stmts = Vec::new();
         let mut expr = None;
 
         // wouldn't it be more uniform to parse view items only, here?
@@ -3328,12 +3341,12 @@ impl Parser {
         while self.token != token::RBRACE {
             // parsing items even when they're not allowed lets us give
             // better error messages and recover more gracefully.
-            attributes_box.push_all(self.parse_outer_attributes());
+            attributes_box.push_all(self.parse_outer_attributes().as_slice());
             match self.token {
                 token::SEMI => {
                     if !attributes_box.is_empty() {
                         self.span_err(self.last_span, "expected item after attributes");
-                        attributes_box = ~[];
+                        attributes_box = Vec::new();
                     }
                     self.bump(); // empty
                 }
@@ -3342,7 +3355,7 @@ impl Parser {
                 }
                 _ => {
                     let stmt = self.parse_stmt(attributes_box);
-                    attributes_box = ~[];
+                    attributes_box = Vec::new();
                     match stmt.node {
                         StmtExpr(e, stmt_id) => {
                             // expression without semicolon
@@ -3510,7 +3523,7 @@ impl Parser {
         }
     }
 
-    fn parse_generic_values_after_lt(&mut self) -> (OptVec<ast::Lifetime>, ~[P<Ty>]) {
+    fn parse_generic_values_after_lt(&mut self) -> (OptVec<ast::Lifetime>, Vec<P<Ty>> ) {
         let lifetimes = self.parse_lifetimes();
         let result = self.parse_seq_to_gt(
             Some(token::COMMA),
@@ -3519,9 +3532,9 @@ impl Parser {
     }
 
     fn parse_fn_args(&mut self, named_args: bool, allow_variadic: bool)
-                     -> (~[Arg], bool) {
+                     -> (Vec<Arg> , bool) {
         let sp = self.span;
-        let mut args: ~[Option<Arg>] =
+        let mut args: Vec<Option<Arg>> =
             self.parse_unspanned_seq(
                 &token::LPAREN,
                 &token::RPAREN,
@@ -3716,7 +3729,7 @@ impl Parser {
                     fn_inputs
                 }
                 token::RPAREN => {
-                    ~[Arg::new_self(explicit_self_sp, mutbl_self)]
+                    vec!(Arg::new_self(explicit_self_sp, mutbl_self))
                 }
                 _ => {
                     let token_str = self.this_token_to_str();
@@ -3749,7 +3762,7 @@ impl Parser {
     fn parse_fn_block_decl(&mut self) -> P<FnDecl> {
         let inputs_captures = {
             if self.eat(&token::OROR) {
-                ~[]
+                Vec::new()
             } else {
                 self.parse_unspanned_seq(
                     &token::BINOP(token::OR),
@@ -3812,7 +3825,7 @@ impl Parser {
 
     fn mk_item(&mut self, lo: BytePos, hi: BytePos, ident: Ident,
                node: Item_, vis: Visibility,
-               attrs: ~[Attribute]) -> @Item {
+               attrs: Vec<Attribute> ) -> @Item {
         @Item {
             ident: ident,
             attrs: attrs,
@@ -3832,7 +3845,7 @@ impl Parser {
     }
 
     // parse a method in a trait impl, starting with `attrs` attributes.
-    fn parse_method(&mut self, already_parsed_attrs: Option<~[Attribute]>) -> @Method {
+    fn parse_method(&mut self, already_parsed_attrs: Option<Vec<Attribute> >) -> @Method {
         let next_attrs = self.parse_outer_attributes();
         let attrs = match already_parsed_attrs {
             Some(mut a) => { a.push_all_move(next_attrs); a }
@@ -3851,7 +3864,7 @@ impl Parser {
 
         let (inner_attrs, body) = self.parse_inner_attrs_and_block();
         let hi = body.span.hi;
-        let attrs = vec::append(attrs, inner_attrs);
+        let attrs = vec_ng::append(attrs, inner_attrs.as_slice());
         @ast::Method {
             ident: ident,
             attrs: attrs,
@@ -3877,7 +3890,7 @@ impl Parser {
             self.bump();
             traits = self.parse_trait_ref_list(&token::LBRACE);
         } else {
-            traits = ~[];
+            traits = Vec::new();
         }
 
         let meths = self.parse_trait_methods();
@@ -3925,7 +3938,7 @@ impl Parser {
             None
         };
 
-        let mut meths = ~[];
+        let mut meths = Vec::new();
         self.expect(&token::LBRACE);
         let (inner_attrs, next) = self.parse_inner_attrs_and_next();
         let mut method_attrs = Some(next);
@@ -3948,7 +3961,7 @@ impl Parser {
     }
 
     // parse B + C<~str,int> + D
-    fn parse_trait_ref_list(&mut self, ket: &token::Token) -> ~[TraitRef] {
+    fn parse_trait_ref_list(&mut self, ket: &token::Token) -> Vec<TraitRef> {
         self.parse_seq_to_before_end(
             ket,
             seq_sep_trailing_disallowed(token::BINOP(token::PLUS)),
@@ -3961,13 +3974,13 @@ impl Parser {
         let class_name = self.parse_ident();
         let generics = self.parse_generics();
 
-        let mut fields: ~[StructField];
+        let mut fields: Vec<StructField> ;
         let is_tuple_like;
 
         if self.eat(&token::LBRACE) {
             // It's a record-like struct.
             is_tuple_like = false;
-            fields = ~[];
+            fields = Vec::new();
             while self.token != token::RBRACE {
                 fields.push(self.parse_struct_decl_field());
             }
@@ -3998,7 +4011,7 @@ impl Parser {
         } else if self.eat(&token::SEMI) {
             // It's a unit-like struct.
             is_tuple_like = true;
-            fields = ~[];
+            fields = Vec::new();
         } else {
             let token_str = self.this_token_to_str();
             self.fatal(format!("expected `\\{`, `(`, or `;` after struct \
@@ -4019,7 +4032,7 @@ impl Parser {
     // parse a structure field declaration
     pub fn parse_single_struct_field(&mut self,
                                      vis: Visibility,
-                                     attrs: ~[Attribute])
+                                     attrs: Vec<Attribute> )
                                      -> StructField {
         let a_var = self.parse_name_and_ty(vis, attrs);
         match self.token {
@@ -4064,7 +4077,7 @@ impl Parser {
     // attributes (of length 0 or 1), parse all of the items in a module
     fn parse_mod_items(&mut self,
                        term: token::Token,
-                       first_item_attrs: ~[Attribute])
+                       first_item_attrs: Vec<Attribute> )
                        -> Mod {
         // parse all of the items up to closing or an attribute.
         // view items are legal here.
@@ -4074,7 +4087,7 @@ impl Parser {
             items: starting_items,
             ..
         } = self.parse_items_and_view_items(first_item_attrs, true, true);
-        let mut items: ~[@Item] = starting_items;
+        let mut items: Vec<@Item> = starting_items;
         let attrs_remaining_len = attrs_remaining.len();
 
         // don't think this other loop is even necessary....
@@ -4083,7 +4096,8 @@ impl Parser {
         while self.token != term {
             let mut attrs = self.parse_outer_attributes();
             if first {
-                attrs = attrs_remaining + attrs;
+                attrs = vec_ng::append(attrs_remaining.clone(),
+                                       attrs.as_slice());
                 first = false;
             }
             debug!("parse_mod_items: parse_item_or_view_item(attrs={:?})",
@@ -4162,10 +4176,10 @@ impl Parser {
                     id: ast::Ident,
                     outer_attrs: &[ast::Attribute],
                     id_sp: Span)
-                    -> (ast::Item_, ~[ast::Attribute]) {
+                    -> (ast::Item_, Vec<ast::Attribute> ) {
         let mut prefix = Path::new(self.sess.cm.span_to_filename(self.span));
         prefix.pop();
-        let mod_path = Path::new(".").join_many(self.mod_path_stack);
+        let mod_path = Path::new(".").join_many(self.mod_path_stack.as_slice());
         let dir_path = prefix.join(&mod_path);
         let file_path = match ::attr::first_attr_value_str_by_name(
                 outer_attrs, "path") {
@@ -4195,14 +4209,14 @@ impl Parser {
         };
 
         self.eval_src_mod_from_path(file_path,
-                                    outer_attrs.to_owned(),
+                                    outer_attrs.iter().map(|x| *x).collect(),
                                     id_sp)
     }
 
     fn eval_src_mod_from_path(&mut self,
                               path: Path,
-                              outer_attrs: ~[ast::Attribute],
-                              id_sp: Span) -> (ast::Item_, ~[ast::Attribute]) {
+                              outer_attrs: Vec<ast::Attribute> ,
+                              id_sp: Span) -> (ast::Item_, Vec<ast::Attribute> ) {
         {
             let mut included_mod_stack = self.sess
                                              .included_mod_stack
@@ -4232,7 +4246,7 @@ impl Parser {
                                      &path,
                                      id_sp);
         let (inner, next) = p0.parse_inner_attrs_and_next();
-        let mod_attrs = vec::append(outer_attrs, inner);
+        let mod_attrs = vec_ng::append(outer_attrs, inner.as_slice());
         let first_item_outer_attrs = next;
         let m0 = p0.parse_mod_items(token::EOF, first_item_outer_attrs);
         {
@@ -4246,7 +4260,7 @@ impl Parser {
 
     // parse a function declaration from a foreign module
     fn parse_item_foreign_fn(&mut self, vis: ast::Visibility,
-                             attrs: ~[Attribute]) -> @ForeignItem {
+                             attrs: Vec<Attribute> ) -> @ForeignItem {
         let lo = self.span.lo;
 
         // Parse obsolete purity.
@@ -4269,7 +4283,7 @@ impl Parser {
 
     // parse a static item from a foreign module
     fn parse_item_foreign_static(&mut self, vis: ast::Visibility,
-                                 attrs: ~[Attribute]) -> @ForeignItem {
+                                 attrs: Vec<Attribute> ) -> @ForeignItem {
         let lo = self.span.lo;
 
         self.expect_keyword(keywords::Static);
@@ -4303,7 +4317,7 @@ impl Parser {
     // parse_foreign_items.
     fn parse_foreign_mod_items(&mut self,
                                abis: AbiSet,
-                               first_item_attrs: ~[Attribute])
+                               first_item_attrs: Vec<Attribute> )
                                -> ForeignMod {
         let ParsedItemsAndViewItems {
             attrs_remaining: attrs_remaining,
@@ -4332,7 +4346,7 @@ impl Parser {
     fn parse_item_extern_crate(&mut self,
                                 lo: BytePos,
                                 visibility: Visibility,
-                                attrs: ~[Attribute])
+                                attrs: Vec<Attribute> )
                                 -> ItemOrViewItem {
 
         let (maybe_path, ident) = match self.token {
@@ -4377,7 +4391,7 @@ impl Parser {
                               lo: BytePos,
                               opt_abis: Option<AbiSet>,
                               visibility: Visibility,
-                              attrs: ~[Attribute])
+                              attrs: Vec<Attribute> )
                               -> ItemOrViewItem {
 
         self.expect(&token::LBRACE);
@@ -4410,7 +4424,7 @@ impl Parser {
     // parse a structure-like enum variant definition
     // this should probably be renamed or refactored...
     fn parse_struct_def(&mut self) -> @StructDef {
-        let mut fields: ~[StructField] = ~[];
+        let mut fields: Vec<StructField> = Vec::new();
         while self.token != token::RBRACE {
             fields.push(self.parse_struct_decl_field());
         }
@@ -4424,7 +4438,7 @@ impl Parser {
 
     // parse the part of an "enum" decl following the '{'
     fn parse_enum_def(&mut self, _generics: &ast::Generics) -> EnumDef {
-        let mut variants = ~[];
+        let mut variants = Vec::new();
         let mut all_nullary = true;
         let mut have_disr = false;
         while self.token != token::RBRACE {
@@ -4435,7 +4449,7 @@ impl Parser {
 
             let ident;
             let kind;
-            let mut args = ~[];
+            let mut args = Vec::new();
             let mut disr_expr = None;
             ident = self.parse_ident();
             if self.eat(&token::LBRACE) {
@@ -4462,7 +4476,7 @@ impl Parser {
                 disr_expr = Some(self.parse_expr());
                 kind = TupleVariantKind(args);
             } else {
-                kind = TupleVariantKind(~[]);
+                kind = TupleVariantKind(Vec::new());
             }
 
             let vr = ast::Variant_ {
@@ -4551,13 +4565,13 @@ impl Parser {
     // NB: this function no longer parses the items inside an
     // extern crate.
     fn parse_item_or_view_item(&mut self,
-                               attrs: ~[Attribute],
+                               attrs: Vec<Attribute> ,
                                macros_allowed: bool)
                                -> ItemOrViewItem {
         match self.token {
             INTERPOLATED(token::NtItem(item)) => {
                 self.bump();
-                let new_attrs = vec::append(attrs, item.attrs);
+                let new_attrs = vec_ng::append(attrs, item.attrs.as_slice());
                 return IoviItem(@Item {
                     attrs: new_attrs,
                     ..(*item).clone()
@@ -4663,7 +4677,8 @@ impl Parser {
         }
         if self.eat_keyword(keywords::Mod) {
             // MODULE ITEM
-            let (ident, item_, extra_attrs) = self.parse_item_mod(attrs);
+            let (ident, item_, extra_attrs) =
+                self.parse_item_mod(attrs.as_slice());
             let item = self.mk_item(lo,
                                     self.last_span.hi,
                                     ident,
@@ -4732,7 +4747,7 @@ impl Parser {
 
     // parse a foreign item; on failure, return IoviNone.
     fn parse_foreign_item(&mut self,
-                          attrs: ~[Attribute],
+                          attrs: Vec<Attribute> ,
                           macros_allowed: bool)
                           -> ItemOrViewItem {
         maybe_whole!(iovi self, NtItem);
@@ -4756,7 +4771,7 @@ impl Parser {
     // this is the fall-through for parsing items.
     fn parse_macro_use_or_failure(
         &mut self,
-        attrs: ~[Attribute],
+        attrs: Vec<Attribute> ,
         macros_allowed: bool,
         lo: BytePos,
         visibility: Visibility
@@ -4820,7 +4835,7 @@ impl Parser {
         return IoviNone(attrs);
     }
 
-    pub fn parse_item(&mut self, attrs: ~[Attribute]) -> Option<@Item> {
+    pub fn parse_item(&mut self, attrs: Vec<Attribute> ) -> Option<@Item> {
         match self.parse_item_or_view_item(attrs, true) {
             IoviNone(_) => None,
             IoviViewItem(_) =>
@@ -4854,20 +4869,20 @@ impl Parser {
             let path = ast::Path {
                 span: mk_sp(lo, self.span.hi),
                 global: false,
-                segments: ~[]
+                segments: Vec::new()
             };
             return @spanned(lo, self.span.hi,
                             ViewPathList(path, idents, ast::DUMMY_NODE_ID));
         }
 
         let first_ident = self.parse_ident();
-        let mut path = ~[first_ident];
+        let mut path = vec!(first_ident);
         match self.token {
           token::EQ => {
             // x = foo::bar
             self.bump();
             let path_lo = self.span.lo;
-            path = ~[self.parse_ident()];
+            path = vec!(self.parse_ident());
             while self.token == token::MOD_SEP {
                 self.bump();
                 let id = self.parse_ident();
@@ -4947,7 +4962,7 @@ impl Parser {
           }
           _ => ()
         }
-        let last = path[path.len() - 1u];
+        let last = *path.get(path.len() - 1u);
         let path = ast::Path {
             span: mk_sp(lo, self.span.hi),
             global: false,
@@ -4965,8 +4980,8 @@ impl Parser {
     }
 
     // matches view_paths = view_path | view_path , view_paths
-    fn parse_view_paths(&mut self) -> ~[@ViewPath] {
-        let mut vp = ~[self.parse_view_path()];
+    fn parse_view_paths(&mut self) -> Vec<@ViewPath> {
+        let mut vp = vec!(self.parse_view_path());
         while self.token == token::COMMA {
             self.bump();
             self.obsolete(self.last_span, ObsoleteMultipleImport);
@@ -4980,15 +4995,16 @@ impl Parser {
     // - mod_items uses extern_mod_allowed = true
     // - block_tail_ uses extern_mod_allowed = false
     fn parse_items_and_view_items(&mut self,
-                                  first_item_attrs: ~[Attribute],
+                                  first_item_attrs: Vec<Attribute> ,
                                   mut extern_mod_allowed: bool,
                                   macros_allowed: bool)
                                   -> ParsedItemsAndViewItems {
-        let mut attrs = vec::append(first_item_attrs,
-                                    self.parse_outer_attributes());
+        let mut attrs = vec_ng::append(first_item_attrs,
+                                       self.parse_outer_attributes()
+                                           .as_slice());
         // First, parse view items.
-        let mut view_items : ~[ast::ViewItem] = ~[];
-        let mut items = ~[];
+        let mut view_items : Vec<ast::ViewItem> = Vec::new();
+        let mut items = Vec::new();
 
         // I think this code would probably read better as a single
         // loop with a mutable three-state-variable (for extern crates,
@@ -5001,7 +5017,7 @@ impl Parser {
                         attrs_remaining: attrs,
                         view_items: view_items,
                         items: items,
-                        foreign_items: ~[]
+                        foreign_items: Vec::new()
                     }
                 }
                 IoviViewItem(view_item) => {
@@ -5056,18 +5072,19 @@ impl Parser {
             attrs_remaining: attrs,
             view_items: view_items,
             items: items,
-            foreign_items: ~[]
+            foreign_items: Vec::new()
         }
     }
 
     // Parses a sequence of foreign items. Stops when it finds program
     // text that can't be parsed as an item
-    fn parse_foreign_items(&mut self, first_item_attrs: ~[Attribute],
+    fn parse_foreign_items(&mut self, first_item_attrs: Vec<Attribute> ,
                            macros_allowed: bool)
         -> ParsedItemsAndViewItems {
-        let mut attrs = vec::append(first_item_attrs,
-                                    self.parse_outer_attributes());
-        let mut foreign_items = ~[];
+        let mut attrs = vec_ng::append(first_item_attrs,
+                                       self.parse_outer_attributes()
+                                           .as_slice());
+        let mut foreign_items = Vec::new();
         loop {
             match self.parse_foreign_item(attrs, macros_allowed) {
                 IoviNone(returned_attrs) => {
@@ -5095,8 +5112,8 @@ impl Parser {
 
         ParsedItemsAndViewItems {
             attrs_remaining: attrs,
-            view_items: ~[],
-            items: ~[],
+            view_items: Vec::new(),
+            items: Vec::new(),
             foreign_items: foreign_items
         }
     }
diff --git a/src/libsyntax/parse/token.rs b/src/libsyntax/parse/token.rs
index edc5e613f9116..1499a1b4c19be 100644
--- a/src/libsyntax/parse/token.rs
+++ b/src/libsyntax/parse/token.rs
@@ -21,6 +21,7 @@ use std::char;
 use std::fmt;
 use std::local_data;
 use std::path::BytesContainer;
+use std::vec_ng::Vec;
 
 #[allow(non_camel_case_types)]
 #[deriving(Clone, Encodable, Decodable, Eq, Hash, Show)]
@@ -115,7 +116,7 @@ pub enum Nonterminal {
     NtAttr(@ast::Attribute), // #[foo]
     NtPath(~ast::Path),
     NtTT(  @ast::TokenTree), // needs @ed to break a circularity
-    NtMatchers(~[ast::Matcher])
+    NtMatchers(Vec<ast::Matcher> )
 }
 
 impl fmt::Show for Nonterminal {
@@ -412,13 +413,11 @@ macro_rules! declare_special_idents_and_keywords {(
         // The indices here must correspond to the numbers in
         // special_idents, in Keyword to_ident(), and in static
         // constants below.
-        let init_vec = ~[
-            $( $si_str, )*
-            $( $sk_str, )*
-            $( $rk_str, )*
-        ];
-
-        interner::StrInterner::prefill(init_vec)
+        let mut init_vec = Vec::new();
+        $(init_vec.push($si_str);)*
+        $(init_vec.push($sk_str);)*
+        $(init_vec.push($rk_str);)*
+        interner::StrInterner::prefill(init_vec.as_slice())
     }
 }}
 
diff --git a/src/libsyntax/print/pp.rs b/src/libsyntax/print/pp.rs
index 14d8c662aae0e..e9e0e4835933b 100644
--- a/src/libsyntax/print/pp.rs
+++ b/src/libsyntax/print/pp.rs
@@ -62,7 +62,7 @@
  */
 
 use std::io;
-use std::vec;
+use std::vec_ng::Vec;
 
 #[deriving(Clone, Eq)]
 pub enum Breaks {
@@ -119,7 +119,7 @@ pub fn tok_str(t: Token) -> ~str {
     }
 }
 
-pub fn buf_str(toks: ~[Token], szs: ~[int], left: uint, right: uint,
+pub fn buf_str(toks: Vec<Token> , szs: Vec<int> , left: uint, right: uint,
                lim: uint) -> ~str {
     let n = toks.len();
     assert_eq!(n, szs.len());
@@ -131,7 +131,7 @@ pub fn buf_str(toks: ~[Token], szs: ~[int], left: uint, right: uint,
         if i != left {
             s.push_str(", ");
         }
-        s.push_str(format!("{}={}", szs[i], tok_str(toks[i].clone())));
+        s.push_str(format!("{}={}", szs.get(i), tok_str(toks.get(i).clone())));
         i += 1u;
         i %= n;
     }
@@ -156,9 +156,9 @@ pub fn mk_printer(out: ~io::Writer, linewidth: uint) -> Printer {
     // fall behind.
     let n: uint = 3 * linewidth;
     debug!("mk_printer {}", linewidth);
-    let token: ~[Token] = vec::from_elem(n, Eof);
-    let size: ~[int] = vec::from_elem(n, 0);
-    let scan_stack: ~[uint] = vec::from_elem(n, 0u);
+    let token: Vec<Token> = Vec::from_elem(n, Eof);
+    let size: Vec<int> = Vec::from_elem(n, 0);
+    let scan_stack: Vec<uint> = Vec::from_elem(n, 0u);
     Printer {
         out: out,
         buf_len: n,
@@ -174,7 +174,7 @@ pub fn mk_printer(out: ~io::Writer, linewidth: uint) -> Printer {
         scan_stack_empty: true,
         top: 0,
         bottom: 0,
-        print_stack: ~[],
+        print_stack: Vec::new(),
         pending_indentation: 0
     }
 }
@@ -264,8 +264,8 @@ pub struct Printer {
     space: int, // number of spaces left on line
     left: uint, // index of left side of input stream
     right: uint, // index of right side of input stream
-    token: ~[Token], // ring-buffr stream goes through
-    size: ~[int], // ring-buffer of calculated sizes
+    token: Vec<Token> , // ring-buffr stream goes through
+    size: Vec<int> , // ring-buffer of calculated sizes
     left_total: int, // running size of stream "...left"
     right_total: int, // running size of stream "...right"
     // pseudo-stack, really a ring too. Holds the
@@ -274,23 +274,23 @@ pub struct Printer {
     // Begin (if there is any) on top of it. Stuff is flushed off the
     // bottom as it becomes irrelevant due to the primary ring-buffer
     // advancing.
-    scan_stack: ~[uint],
+    scan_stack: Vec<uint> ,
     scan_stack_empty: bool, // top==bottom disambiguator
     top: uint, // index of top of scan_stack
     bottom: uint, // index of bottom of scan_stack
     // stack of blocks-in-progress being flushed by print
-    print_stack: ~[PrintStackElem],
+    print_stack: Vec<PrintStackElem> ,
     // buffered indentation to avoid writing trailing whitespace
     pending_indentation: int,
 }
 
 impl Printer {
     pub fn last_token(&mut self) -> Token {
-        self.token[self.right].clone()
+        (*self.token.get(self.right)).clone()
     }
     // be very careful with this!
     pub fn replace_last_token(&mut self, t: Token) {
-        self.token[self.right] = t;
+        *self.token.get_mut(self.right) = t;
     }
     pub fn pretty_print(&mut self, t: Token) -> io::IoResult<()> {
         debug!("pp ~[{},{}]", self.left, self.right);
@@ -298,8 +298,9 @@ impl Printer {
           Eof => {
             if !self.scan_stack_empty {
                 self.check_stack(0);
-                let left = self.token[self.left].clone();
-                try!(self.advance_left(left, self.size[self.left]));
+                let left = (*self.token.get(self.left)).clone();
+                let left_size = *self.size.get(self.left);
+                try!(self.advance_left(left, left_size));
             }
             self.indent(0);
             Ok(())
@@ -313,8 +314,8 @@ impl Printer {
             } else { self.advance_right(); }
             debug!("pp Begin({})/buffer ~[{},{}]",
                    b.offset, self.left, self.right);
-            self.token[self.right] = t;
-            self.size[self.right] = -self.right_total;
+            *self.token.get_mut(self.right) = t;
+            *self.size.get_mut(self.right) = -self.right_total;
             self.scan_push(self.right);
             Ok(())
           }
@@ -325,8 +326,8 @@ impl Printer {
             } else {
                 debug!("pp End/buffer ~[{},{}]", self.left, self.right);
                 self.advance_right();
-                self.token[self.right] = t;
-                self.size[self.right] = -1;
+                *self.token.get_mut(self.right) = t;
+                *self.size.get_mut(self.right) = -1;
                 self.scan_push(self.right);
                 Ok(())
             }
@@ -342,8 +343,8 @@ impl Printer {
                    b.offset, self.left, self.right);
             self.check_stack(0);
             self.scan_push(self.right);
-            self.token[self.right] = t;
-            self.size[self.right] = -self.right_total;
+            *self.token.get_mut(self.right) = t;
+            *self.size.get_mut(self.right) = -self.right_total;
             self.right_total += b.blank_space;
             Ok(())
           }
@@ -356,8 +357,8 @@ impl Printer {
                 debug!("pp String('{}')/buffer ~[{},{}]",
                        *s, self.left, self.right);
                 self.advance_right();
-                self.token[self.right] = t.clone();
-                self.size[self.right] = len;
+                *self.token.get_mut(self.right) = t.clone();
+                *self.size.get_mut(self.right) = len;
                 self.right_total += len;
                 self.check_stream()
             }
@@ -371,13 +372,15 @@ impl Printer {
             debug!("scan window is {}, longer than space on line ({})",
                    self.right_total - self.left_total, self.space);
             if !self.scan_stack_empty {
-                if self.left == self.scan_stack[self.bottom] {
+                if self.left == *self.scan_stack.get(self.bottom) {
                     debug!("setting {} to infinity and popping", self.left);
-                    self.size[self.scan_pop_bottom()] = SIZE_INFINITY;
+                    let scanned = self.scan_pop_bottom();
+                    *self.size.get_mut(scanned) = SIZE_INFINITY;
                 }
             }
-            let left = self.token[self.left].clone();
-            try!(self.advance_left(left, self.size[self.left]));
+            let left = (*self.token.get(self.left)).clone();
+            let left_size = *self.size.get(self.left);
+            try!(self.advance_left(left, left_size));
             if self.left != self.right {
                 try!(self.check_stream());
             }
@@ -393,26 +396,30 @@ impl Printer {
             self.top %= self.buf_len;
             assert!((self.top != self.bottom));
         }
-        self.scan_stack[self.top] = x;
+        *self.scan_stack.get_mut(self.top) = x;
     }
     pub fn scan_pop(&mut self) -> uint {
         assert!((!self.scan_stack_empty));
-        let x = self.scan_stack[self.top];
+        let x = *self.scan_stack.get(self.top);
         if self.top == self.bottom {
             self.scan_stack_empty = true;
-        } else { self.top += self.buf_len - 1u; self.top %= self.buf_len; }
+        } else {
+            self.top += self.buf_len - 1u; self.top %= self.buf_len;
+        }
         return x;
     }
     pub fn scan_top(&mut self) -> uint {
         assert!((!self.scan_stack_empty));
-        return self.scan_stack[self.top];
+        return *self.scan_stack.get(self.top);
     }
     pub fn scan_pop_bottom(&mut self) -> uint {
         assert!((!self.scan_stack_empty));
-        let x = self.scan_stack[self.bottom];
+        let x = *self.scan_stack.get(self.bottom);
         if self.top == self.bottom {
             self.scan_stack_empty = true;
-        } else { self.bottom += 1u; self.bottom %= self.buf_len; }
+        } else {
+            self.bottom += 1u; self.bottom %= self.buf_len;
+        }
         return x;
     }
     pub fn advance_right(&mut self) {
@@ -435,8 +442,9 @@ impl Printer {
             if self.left != self.right {
                 self.left += 1u;
                 self.left %= self.buf_len;
-                let left = self.token[self.left].clone();
-                try!(self.advance_left(left, self.size[self.left]));
+                let left = (*self.token.get(self.left)).clone();
+                let left_size = *self.size.get(self.left);
+                try!(self.advance_left(left, left_size));
             }
             ret
         } else {
@@ -446,22 +454,28 @@ impl Printer {
     pub fn check_stack(&mut self, k: int) {
         if !self.scan_stack_empty {
             let x = self.scan_top();
-            match self.token[x] {
-              Begin(_) => {
+            match self.token.get(x) {
+              &Begin(_) => {
                 if k > 0 {
-                    self.size[self.scan_pop()] = self.size[x] +
+                    let popped = self.scan_pop();
+                    *self.size.get_mut(popped) = *self.size.get(x) +
                         self.right_total;
                     self.check_stack(k - 1);
                 }
               }
-              End => {
+              &End => {
                 // paper says + not =, but that makes no sense.
-                self.size[self.scan_pop()] = 1;
+                let popped = self.scan_pop();
+                *self.size.get_mut(popped) = 1;
                 self.check_stack(k + 1);
               }
               _ => {
-                self.size[self.scan_pop()] = self.size[x] + self.right_total;
-                if k > 0 { self.check_stack(k); }
+                let popped = self.scan_pop();
+                *self.size.get_mut(popped) = *self.size.get(x) +
+                    self.right_total;
+                if k > 0 {
+                    self.check_stack(k);
+                }
               }
             }
         }
@@ -481,7 +495,7 @@ impl Printer {
         let print_stack = &mut self.print_stack;
         let n = print_stack.len();
         if n != 0u {
-            print_stack[n - 1u]
+            *print_stack.get(n - 1u)
         } else {
             PrintStackElem {
                 offset: 0,
diff --git a/src/libsyntax/print/pprust.rs b/src/libsyntax/print/pprust.rs
index 688494ec5eeab..d027efc1d42f6 100644
--- a/src/libsyntax/print/pprust.rs
+++ b/src/libsyntax/print/pprust.rs
@@ -33,6 +33,7 @@ use std::char;
 use std::str;
 use std::io;
 use std::io::MemWriter;
+use std::vec_ng::Vec;
 
 // The &mut State is stored here to prevent recursive type.
 pub enum AnnNode<'a, 'b> {
@@ -60,10 +61,10 @@ pub struct State<'a> {
     s: pp::Printer,
     cm: Option<@CodeMap>,
     intr: @token::IdentInterner,
-    comments: Option<~[comments::Comment]>,
-    literals: Option<~[comments::Literal]>,
+    comments: Option<Vec<comments::Comment> >,
+    literals: Option<Vec<comments::Literal> >,
     cur_cmnt_and_lit: CurrentCommentAndLiteral,
-    boxes: RefCell<~[pp::Breaks]>,
+    boxes: RefCell<Vec<pp::Breaks> >,
     ann: &'a PpAnn
 }
 
@@ -98,7 +99,7 @@ pub fn rust_printer_annotated<'a>(writer: ~io::Writer, ann: &'a PpAnn) -> State<
             cur_cmnt: 0,
             cur_lit: 0
         },
-        boxes: RefCell::new(~[]),
+        boxes: RefCell::new(Vec::new()),
         ann: ann
     }
 }
@@ -140,14 +141,14 @@ pub fn print_crate(cm: @CodeMap,
             cur_cmnt: 0,
             cur_lit: 0
         },
-        boxes: RefCell::new(~[]),
+        boxes: RefCell::new(Vec::new()),
         ann: ann
     };
     print_crate_(&mut s, krate)
 }
 
 pub fn print_crate_(s: &mut State, krate: &ast::Crate) -> io::IoResult<()> {
-    try!(print_mod(s, &krate.module, krate.attrs));
+    try!(print_mod(s, &krate.module, krate.attrs.as_slice()));
     try!(print_remaining_comments(s));
     try!(eof(&mut s.s));
     Ok(())
@@ -319,7 +320,7 @@ pub fn in_cbox(s: &mut State) -> bool {
     let boxes = s.boxes.borrow();
     let len = boxes.get().len();
     if len == 0u { return false; }
-    return boxes.get()[len - 1u] == pp::Consistent;
+    return *boxes.get().get(len - 1u) == pp::Consistent;
 }
 
 pub fn hardbreak_if_not_bol(s: &mut State) -> io::IoResult<()> {
@@ -463,7 +464,7 @@ pub fn print_type(s: &mut State, ty: &ast::Ty) -> io::IoResult<()> {
         }
         ast::TyTup(ref elts) => {
             try!(popen(s));
-            try!(commasep(s, Inconsistent, *elts, print_type_ref));
+            try!(commasep(s, Inconsistent, elts.as_slice(), print_type_ref));
             if elts.len() == 1 {
                 try!(word(&mut s.s, ","));
             }
@@ -517,7 +518,7 @@ pub fn print_foreign_item(s: &mut State,
                           item: &ast::ForeignItem) -> io::IoResult<()> {
     try!(hardbreak_if_not_bol(s));
     try!(maybe_print_comment(s, item.span.lo));
-    try!(print_outer_attributes(s, item.attrs));
+    try!(print_outer_attributes(s, item.attrs.as_slice()));
     match item.node {
         ast::ForeignItemFn(decl, ref generics) => {
             try!(print_fn(s, decl, None, AbiSet::Rust(), item.ident, generics,
@@ -545,7 +546,7 @@ pub fn print_foreign_item(s: &mut State,
 pub fn print_item(s: &mut State, item: &ast::Item) -> io::IoResult<()> {
     try!(hardbreak_if_not_bol(s));
     try!(maybe_print_comment(s, item.span.lo));
-    try!(print_outer_attributes(s, item.attrs));
+    try!(print_outer_attributes(s, item.attrs.as_slice()));
     {
         let ann_node = NodeItem(s, item);
         try!(s.ann.pre(ann_node));
@@ -580,21 +581,21 @@ pub fn print_item(s: &mut State, item: &ast::Item) -> io::IoResult<()> {
             item.vis
         ));
         try!(word(&mut s.s, " "));
-        try!(print_block_with_attrs(s, body, item.attrs));
+        try!(print_block_with_attrs(s, body, item.attrs.as_slice()));
       }
       ast::ItemMod(ref _mod) => {
         try!(head(s, visibility_qualified(item.vis, "mod")));
         try!(print_ident(s, item.ident));
         try!(nbsp(s));
         try!(bopen(s));
-        try!(print_mod(s, _mod, item.attrs));
+        try!(print_mod(s, _mod, item.attrs.as_slice()));
         try!(bclose(s, item.span));
       }
       ast::ItemForeignMod(ref nmod) => {
         try!(head(s, "extern"));
         try!(word_nbsp(s, nmod.abis.to_str()));
         try!(bopen(s));
-        try!(print_foreign_mod(s, nmod, item.attrs));
+        try!(print_foreign_mod(s, nmod, item.attrs.as_slice()));
         try!(bclose(s, item.span));
       }
       ast::ItemTy(ty, ref params) => {
@@ -646,7 +647,7 @@ pub fn print_item(s: &mut State, item: &ast::Item) -> io::IoResult<()> {
 
         try!(space(&mut s.s));
         try!(bopen(s));
-        try!(print_inner_attributes(s, item.attrs));
+        try!(print_inner_attributes(s, item.attrs.as_slice()));
         for meth in methods.iter() {
            try!(print_method(s, *meth));
         }
@@ -706,7 +707,7 @@ pub fn print_enum_def(s: &mut State, enum_definition: &ast::EnumDef,
     try!(print_ident(s, ident));
     try!(print_generics(s, generics));
     try!(space(&mut s.s));
-    try!(print_variants(s, enum_definition.variants, span));
+    try!(print_variants(s, enum_definition.variants.as_slice(), span));
     Ok(())
 }
 
@@ -717,7 +718,7 @@ pub fn print_variants(s: &mut State,
     for &v in variants.iter() {
         try!(space_if_not_bol(s));
         try!(maybe_print_comment(s, v.span.lo));
-        try!(print_outer_attributes(s, v.node.attrs));
+        try!(print_outer_attributes(s, v.node.attrs.as_slice()));
         try!(ibox(s, indent_unit));
         try!(print_variant(s, v));
         try!(word(&mut s.s, ","));
@@ -761,7 +762,10 @@ pub fn print_struct(s: &mut State,
     if ast_util::struct_def_is_tuple_like(struct_def) {
         if !struct_def.fields.is_empty() {
             try!(popen(s));
-            try!(commasep(s, Inconsistent, struct_def.fields, |s, field| {
+            try!(commasep(s,
+                          Inconsistent,
+                          struct_def.fields.as_slice(),
+                          |s, field| {
                 match field.node.kind {
                     ast::NamedField(..) => fail!("unexpected named field"),
                     ast::UnnamedField => {
@@ -787,7 +791,8 @@ pub fn print_struct(s: &mut State,
                 ast::NamedField(ident, visibility) => {
                     try!(hardbreak_if_not_bol(s));
                     try!(maybe_print_comment(s, field.span.lo));
-                    try!(print_outer_attributes(s, field.node.attrs));
+                    try!(print_outer_attributes(s,
+                                                field.node.attrs.as_slice()));
                     try!(print_visibility(s, visibility));
                     try!(print_ident(s, ident));
                     try!(word_nbsp(s, ":"));
@@ -857,7 +862,10 @@ pub fn print_variant(s: &mut State, v: &ast::Variant) -> io::IoResult<()> {
                                      arg: &ast::VariantArg) -> io::IoResult<()> {
                     print_type(s, arg.ty)
                 }
-                try!(commasep(s, Consistent, *args, print_variant_arg));
+                try!(commasep(s,
+                              Consistent,
+                              args.as_slice(),
+                              print_variant_arg));
                 try!(pclose(s));
             }
         }
@@ -881,7 +889,7 @@ pub fn print_variant(s: &mut State, v: &ast::Variant) -> io::IoResult<()> {
 pub fn print_ty_method(s: &mut State, m: &ast::TypeMethod) -> io::IoResult<()> {
     try!(hardbreak_if_not_bol(s));
     try!(maybe_print_comment(s, m.span.lo));
-    try!(print_outer_attributes(s, m.attrs));
+    try!(print_outer_attributes(s, m.attrs.as_slice()));
     try!(print_ty_fn(s,
                        None,
                        None,
@@ -907,12 +915,12 @@ pub fn print_trait_method(s: &mut State,
 pub fn print_method(s: &mut State, meth: &ast::Method) -> io::IoResult<()> {
     try!(hardbreak_if_not_bol(s));
     try!(maybe_print_comment(s, meth.span.lo));
-    try!(print_outer_attributes(s, meth.attrs));
+    try!(print_outer_attributes(s, meth.attrs.as_slice()));
     try!(print_fn(s, meth.decl, Some(meth.purity), AbiSet::Rust(),
                     meth.ident, &meth.generics, Some(meth.explicit_self.node),
                     meth.vis));
     try!(word(&mut s.s, " "));
-    print_block_with_attrs(s, meth.body, meth.attrs)
+    print_block_with_attrs(s, meth.body, meth.attrs.as_slice())
 }
 
 pub fn print_outer_attributes(s: &mut State,
@@ -1184,7 +1192,7 @@ pub fn print_expr(s: &mut State, expr: &ast::Expr) -> io::IoResult<()> {
             try!(word(&mut s.s, "mut"));
             if exprs.len() > 0u { try!(nbsp(s)); }
         }
-        try!(commasep_exprs(s, Inconsistent, *exprs));
+        try!(commasep_exprs(s, Inconsistent, exprs.as_slice()));
         try!(word(&mut s.s, "]"));
         try!(end(s));
       }
@@ -1207,7 +1215,11 @@ pub fn print_expr(s: &mut State, expr: &ast::Expr) -> io::IoResult<()> {
       ast::ExprStruct(ref path, ref fields, wth) => {
         try!(print_path(s, path, true));
         try!(word(&mut s.s, "{"));
-        try!(commasep_cmnt(s, Consistent, (*fields), print_field, get_span));
+        try!(commasep_cmnt(s,
+                           Consistent,
+                           fields.as_slice(),
+                           print_field,
+                           get_span));
         match wth {
             Some(expr) => {
                 try!(ibox(s, indent_unit));
@@ -1225,7 +1237,7 @@ pub fn print_expr(s: &mut State, expr: &ast::Expr) -> io::IoResult<()> {
       }
       ast::ExprTup(ref exprs) => {
         try!(popen(s));
-        try!(commasep_exprs(s, Inconsistent, *exprs));
+        try!(commasep_exprs(s, Inconsistent, exprs.as_slice()));
         if exprs.len() == 1 {
             try!(word(&mut s.s, ","));
         }
@@ -1233,16 +1245,16 @@ pub fn print_expr(s: &mut State, expr: &ast::Expr) -> io::IoResult<()> {
       }
       ast::ExprCall(func, ref args) => {
         try!(print_expr(s, func));
-        try!(print_call_post(s, *args));
+        try!(print_call_post(s, args.as_slice()));
       }
       ast::ExprMethodCall(ident, ref tys, ref args) => {
         let base_args = args.slice_from(1);
-        try!(print_expr(s, args[0]));
+        try!(print_expr(s, *args.get(0)));
         try!(word(&mut s.s, "."));
         try!(print_ident(s, ident));
         if tys.len() > 0u {
             try!(word(&mut s.s, "::<"));
-            try!(commasep(s, Inconsistent, *tys, print_type_ref));
+            try!(commasep(s, Inconsistent, tys.as_slice(), print_type_ref));
             try!(word(&mut s.s, ">"));
         }
         try!(print_call_post(s, base_args));
@@ -1455,7 +1467,7 @@ pub fn print_expr(s: &mut State, expr: &ast::Expr) -> io::IoResult<()> {
         try!(print_ident(s, id));
         if tys.len() > 0u {
             try!(word(&mut s.s, "::<"));
-            try!(commasep(s, Inconsistent, *tys, print_type_ref));
+            try!(commasep(s, Inconsistent, tys.as_slice(), print_type_ref));
             try!(word(&mut s.s, ">"));
         }
       }
@@ -1649,7 +1661,7 @@ fn print_path_(s: &mut State,
                 }
                 try!(commasep(s,
                                 Inconsistent,
-                                segment.types.map_to_vec(|&t| t),
+                                segment.types.map_to_vec(|&t| t).as_slice(),
                                 print_type_ref));
             }
 
@@ -1708,7 +1720,7 @@ pub fn print_pat(s: &mut State, pat: &ast::Pat) -> io::IoResult<()> {
           Some(ref args) => {
             if !args.is_empty() {
               try!(popen(s));
-              try!(commasep(s, Inconsistent, *args,
+              try!(commasep(s, Inconsistent, args.as_slice(),
                               |s, &p| print_pat(s, p)));
               try!(pclose(s));
             } else { }
@@ -1727,7 +1739,7 @@ pub fn print_pat(s: &mut State, pat: &ast::Pat) -> io::IoResult<()> {
             Ok(())
         }
         fn get_span(f: &ast::FieldPat) -> codemap::Span { return f.pat.span; }
-        try!(commasep_cmnt(s, Consistent, *fields,
+        try!(commasep_cmnt(s, Consistent, fields.as_slice(),
                              |s, f| print_field(s,f),
                              get_span));
         if etc {
@@ -1738,7 +1750,10 @@ pub fn print_pat(s: &mut State, pat: &ast::Pat) -> io::IoResult<()> {
       }
       ast::PatTup(ref elts) => {
         try!(popen(s));
-        try!(commasep(s, Inconsistent, *elts, |s, &p| print_pat(s, p)));
+        try!(commasep(s,
+                      Inconsistent,
+                      elts.as_slice(),
+                      |s, &p| print_pat(s, p)));
         if elts.len() == 1 {
             try!(word(&mut s.s, ","));
         }
@@ -1761,7 +1776,10 @@ pub fn print_pat(s: &mut State, pat: &ast::Pat) -> io::IoResult<()> {
       }
       ast::PatVec(ref before, slice, ref after) => {
         try!(word(&mut s.s, "["));
-        try!(commasep(s, Inconsistent, *before, |s, &p| print_pat(s, p)));
+        try!(commasep(s,
+                      Inconsistent,
+                      before.as_slice(),
+                      |s, &p| print_pat(s, p)));
         for &p in slice.iter() {
             if !before.is_empty() { try!(word_space(s, ",")); }
             match *p {
@@ -1773,7 +1791,10 @@ pub fn print_pat(s: &mut State, pat: &ast::Pat) -> io::IoResult<()> {
             try!(print_pat(s, p));
             if !after.is_empty() { try!(word_space(s, ",")); }
         }
-        try!(commasep(s, Inconsistent, *after, |s, &p| print_pat(s, p)));
+        try!(commasep(s,
+                      Inconsistent,
+                      after.as_slice(),
+                      |s, &p| print_pat(s, p)));
         try!(word(&mut s.s, "]"));
       }
     }
@@ -1842,7 +1863,7 @@ pub fn print_fn_args(s: &mut State, decl: &ast::FnDecl,
     for &explicit_self in opt_explicit_self.iter() {
         let m = match explicit_self {
             ast::SelfStatic => ast::MutImmutable,
-            _ => match decl.inputs[0].pat.node {
+            _ => match decl.inputs.get(0).pat.node {
                 ast::PatIdent(ast::BindByValue(m), _, _) => m,
                 _ => ast::MutImmutable
             }
@@ -1981,12 +2002,12 @@ pub fn print_generics(s: &mut State,
             }
         }
 
-        let mut ints = ~[];
+        let mut ints = Vec::new();
         for i in range(0u, total) {
             ints.push(i);
         }
 
-        try!(commasep(s, Inconsistent, ints,
+        try!(commasep(s, Inconsistent, ints.as_slice(),
                         |s, &i| print_item(s, generics, i)));
         try!(word(&mut s.s, ">"));
     }
@@ -2041,7 +2062,7 @@ pub fn print_view_path(s: &mut State, vp: &ast::ViewPath) -> io::IoResult<()> {
             try!(print_path(s, path, false));
             try!(word(&mut s.s, "::{"));
         }
-        try!(commasep(s, Inconsistent, (*idents), |s, w| {
+        try!(commasep(s, Inconsistent, idents.as_slice(), |s, w| {
             print_ident(s, w.node.name)
         }));
         word(&mut s.s, "}")
@@ -2057,7 +2078,7 @@ pub fn print_view_paths(s: &mut State,
 pub fn print_view_item(s: &mut State, item: &ast::ViewItem) -> io::IoResult<()> {
     try!(hardbreak_if_not_bol(s));
     try!(maybe_print_comment(s, item.span.lo));
-    try!(print_outer_attributes(s, item.attrs));
+    try!(print_outer_attributes(s, item.attrs.as_slice()));
     try!(print_visibility(s, item.vis));
     match item.node {
         ast::ViewItemExternMod(id, ref optional_path, _) => {
@@ -2073,7 +2094,7 @@ pub fn print_view_item(s: &mut State, item: &ast::ViewItem) -> io::IoResult<()>
 
         ast::ViewItemUse(ref vps) => {
             try!(head(s, "use"));
-            try!(print_view_paths(s, *vps));
+            try!(print_view_paths(s, vps.as_slice()));
         }
     }
     try!(word(&mut s.s, ";"));
@@ -2103,7 +2124,7 @@ pub fn print_arg(s: &mut State, input: &ast::Arg) -> io::IoResult<()> {
             match input.pat.node {
                 ast::PatIdent(_, ref path, _) if
                     path.segments.len() == 1 &&
-                    path.segments[0].identifier.name ==
+                    path.segments.get(0).identifier.name ==
                         parse::token::special_idents::invalid.name => {
                     // Do nothing.
                 }
@@ -2286,7 +2307,7 @@ pub fn print_literal(s: &mut State, lit: &ast::Lit) -> io::IoResult<()> {
       ast::LitBinary(ref arr) => {
         try!(ibox(s, indent_unit));
         try!(word(&mut s.s, "["));
-        try!(commasep_cmnt(s, Inconsistent, *arr.borrow(),
+        try!(commasep_cmnt(s, Inconsistent, arr.borrow().as_slice(),
                              |s, u| word(&mut s.s, format!("{}", *u)),
                              |_| lit.span));
         try!(word(&mut s.s, "]"));
@@ -2303,7 +2324,7 @@ pub fn next_lit(s: &mut State, pos: BytePos) -> Option<comments::Literal> {
     match s.literals {
       Some(ref lits) => {
         while s.cur_cmnt_and_lit.cur_lit < lits.len() {
-            let ltrl = (*lits)[s.cur_cmnt_and_lit.cur_lit].clone();
+            let ltrl = (*(*lits).get(s.cur_cmnt_and_lit.cur_lit)).clone();
             if ltrl.pos > pos { return None; }
             s.cur_cmnt_and_lit.cur_lit += 1u;
             if ltrl.pos == pos { return Some(ltrl); }
@@ -2335,7 +2356,7 @@ pub fn print_comment(s: &mut State,
         comments::Mixed => {
             assert_eq!(cmnt.lines.len(), 1u);
             try!(zerobreak(&mut s.s));
-            try!(word(&mut s.s, cmnt.lines[0]));
+            try!(word(&mut s.s, *cmnt.lines.get(0)));
             try!(zerobreak(&mut s.s));
         }
         comments::Isolated => {
@@ -2352,7 +2373,7 @@ pub fn print_comment(s: &mut State,
         comments::Trailing => {
             try!(word(&mut s.s, " "));
             if cmnt.lines.len() == 1u {
-                try!(word(&mut s.s, cmnt.lines[0]));
+                try!(word(&mut s.s, *cmnt.lines.get(0)));
                 try!(hardbreak(&mut s.s));
             } else {
                 try!(ibox(s, 0u));
@@ -2414,7 +2435,7 @@ pub fn next_comment(s: &mut State) -> Option<comments::Comment> {
     match s.comments {
         Some(ref cmnts) => {
             if s.cur_cmnt_and_lit.cur_cmnt < cmnts.len() {
-                Some(cmnts[s.cur_cmnt_and_lit.cur_cmnt].clone())
+                Some((*cmnts.get(s.cur_cmnt_and_lit.cur_cmnt)).clone())
             } else {
                 None
             }
@@ -2535,12 +2556,14 @@ mod test {
     use codemap;
     use parse::token;
 
+    use std::vec_ng::Vec;
+
     #[test]
     fn test_fun_to_str() {
         let abba_ident = token::str_to_ident("abba");
 
         let decl = ast::FnDecl {
-            inputs: ~[],
+            inputs: Vec::new(),
             output: ast::P(ast::Ty {id: 0,
                                     node: ast::TyNil,
                                     span: codemap::DUMMY_SP}),
@@ -2559,9 +2582,9 @@ mod test {
 
         let var = codemap::respan(codemap::DUMMY_SP, ast::Variant_ {
             name: ident,
-            attrs: ~[],
+            attrs: Vec::new(),
             // making this up as I go.... ?
-            kind: ast::TupleVariantKind(~[]),
+            kind: ast::TupleVariantKind(Vec::new()),
             id: 0,
             disr_expr: None,
             vis: ast::Public,
diff --git a/src/libsyntax/util/interner.rs b/src/libsyntax/util/interner.rs
index 7b885df0317ee..ba154a8d8923c 100644
--- a/src/libsyntax/util/interner.rs
+++ b/src/libsyntax/util/interner.rs
@@ -21,10 +21,11 @@ use std::cmp::Equiv;
 use std::fmt;
 use std::hash::Hash;
 use std::rc::Rc;
+use std::vec_ng::Vec;
 
 pub struct Interner<T> {
     priv map: RefCell<HashMap<T, Name>>,
-    priv vect: RefCell<~[T]>,
+    priv vect: RefCell<Vec<T> >,
 }
 
 // when traits can extend traits, we should extend index<Name,T> to get []
@@ -32,7 +33,7 @@ impl<T:Eq + Hash + Freeze + Clone + 'static> Interner<T> {
     pub fn new() -> Interner<T> {
         Interner {
             map: RefCell::new(HashMap::new()),
-            vect: RefCell::new(~[]),
+            vect: RefCell::new(Vec::new()),
         }
     }
 
@@ -68,7 +69,7 @@ impl<T:Eq + Hash + Freeze + Clone + 'static> Interner<T> {
 
     pub fn get(&self, idx: Name) -> T {
         let vect = self.vect.borrow();
-        vect.get()[idx].clone()
+        (*vect.get().get(idx as uint)).clone()
     }
 
     pub fn len(&self) -> uint {
@@ -134,7 +135,7 @@ impl RcStr {
 // &str rather than RcStr, resulting in less allocation.
 pub struct StrInterner {
     priv map: RefCell<HashMap<RcStr, Name>>,
-    priv vect: RefCell<~[RcStr]>,
+    priv vect: RefCell<Vec<RcStr> >,
 }
 
 // when traits can extend traits, we should extend index<Name,T> to get []
@@ -142,7 +143,7 @@ impl StrInterner {
     pub fn new() -> StrInterner {
         StrInterner {
             map: RefCell::new(HashMap::new()),
-            vect: RefCell::new(~[]),
+            vect: RefCell::new(Vec::new()),
         }
     }
 
@@ -189,21 +190,21 @@ impl StrInterner {
         let new_idx = self.len() as Name;
         // leave out of map to avoid colliding
         let mut vect = self.vect.borrow_mut();
-        let existing = vect.get()[idx].clone();
+        let existing = (*vect.get().get(idx as uint)).clone();
         vect.get().push(existing);
         new_idx
     }
 
     pub fn get(&self, idx: Name) -> RcStr {
         let vect = self.vect.borrow();
-        vect.get()[idx].clone()
+        (*vect.get().get(idx as uint)).clone()
     }
 
     /// Returns this string with lifetime tied to the interner. Since
     /// strings may never be removed from the interner, this is safe.
     pub fn get_ref<'a>(&'a self, idx: Name) -> &'a str {
         let vect = self.vect.borrow();
-        let s: &str = vect.get()[idx].as_slice();
+        let s: &str = vect.get().get(idx as uint).as_slice();
         unsafe {
             cast::transmute(s)
         }
diff --git a/src/libsyntax/util/parser_testing.rs b/src/libsyntax/util/parser_testing.rs
index 8c7ad028a8ee0..03fc30e2fd771 100644
--- a/src/libsyntax/util/parser_testing.rs
+++ b/src/libsyntax/util/parser_testing.rs
@@ -15,22 +15,24 @@ use parse::{new_parser_from_source_str};
 use parse::parser::Parser;
 use parse::token;
 
+use std::vec_ng::Vec;
+
 // map a string to tts, using a made-up filename: return both the TokenTree's
 // and the ParseSess
-pub fn string_to_tts_and_sess (source_str : ~str) -> (~[ast::TokenTree], @ParseSess) {
+pub fn string_to_tts_and_sess (source_str : ~str) -> (Vec<ast::TokenTree> , @ParseSess) {
     let ps = new_parse_sess();
     (filemap_to_tts(ps,string_to_filemap(ps,source_str,~"bogofile")),ps)
 }
 
 // map a string to tts, using a made-up filename:
-pub fn string_to_tts(source_str : ~str) -> ~[ast::TokenTree] {
+pub fn string_to_tts(source_str : ~str) -> Vec<ast::TokenTree> {
     let (tts,_) = string_to_tts_and_sess(source_str);
     tts
 }
 
 pub fn string_to_parser_and_sess(source_str: ~str) -> (Parser,@ParseSess) {
     let ps = new_parse_sess();
-    (new_parser_from_source_str(ps,~[],~"bogofile",source_str),ps)
+    (new_parser_from_source_str(ps,Vec::new(),~"bogofile",source_str),ps)
 }
 
 // map string to parser (via tts)
@@ -69,14 +71,14 @@ pub fn string_to_expr (source_str : ~str) -> @ast::Expr {
 // parse a string, return an item
 pub fn string_to_item (source_str : ~str) -> Option<@ast::Item> {
     with_error_checking_parse(source_str, |p| {
-        p.parse_item(~[])
+        p.parse_item(Vec::new())
     })
 }
 
 // parse a string, return a stmt
 pub fn string_to_stmt(source_str : ~str) -> @ast::Stmt {
     with_error_checking_parse(source_str, |p| {
-        p.parse_stmt(~[])
+        p.parse_stmt(Vec::new())
     })
 }
 
@@ -87,7 +89,7 @@ pub fn string_to_pat(source_str : ~str) -> @ast::Pat {
 }
 
 // convert a vector of strings to a vector of ast::Ident's
-pub fn strs_to_idents(ids: ~[&str]) -> ~[ast::Ident] {
+pub fn strs_to_idents(ids: Vec<&str> ) -> Vec<ast::Ident> {
     ids.map(|u| token::str_to_ident(*u))
 }
 
diff --git a/src/libsyntax/util/small_vector.rs b/src/libsyntax/util/small_vector.rs
index d6cc35a6f9d3e..9eb9871bb2141 100644
--- a/src/libsyntax/util/small_vector.rs
+++ b/src/libsyntax/util/small_vector.rs
@@ -7,14 +7,16 @@
 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
+
 use std::mem;
-use std::vec;
+use std::vec_ng::Vec;
+use std::vec_ng;
 
 /// A vector type optimized for cases where the size is almost always 0 or 1
 pub enum SmallVector<T> {
     priv Zero,
     priv One(T),
-    priv Many(~[T]),
+    priv Many(Vec<T> ),
 }
 
 impl<T> Container for SmallVector<T> {
@@ -46,7 +48,7 @@ impl<T> SmallVector<T> {
         One(v)
     }
 
-    pub fn many(vs: ~[T]) -> SmallVector<T> {
+    pub fn many(vs: Vec<T> ) -> SmallVector<T> {
         Many(vs)
     }
 
@@ -56,7 +58,7 @@ impl<T> SmallVector<T> {
             One(..) => {
                 let one = mem::replace(self, Zero);
                 match one {
-                    One(v1) => mem::replace(self, Many(~[v1, v])),
+                    One(v1) => mem::replace(self, Many(vec!(v1, v))),
                     _ => unreachable!()
                 };
             }
@@ -73,7 +75,7 @@ impl<T> SmallVector<T> {
     pub fn get<'a>(&'a self, idx: uint) -> &'a T {
         match *self {
             One(ref v) if idx == 0 => v,
-            Many(ref vs) => &vs[idx],
+            Many(ref vs) => vs.get(idx),
             _ => fail!("out of bounds access")
         }
     }
@@ -104,7 +106,7 @@ impl<T> SmallVector<T> {
 pub enum MoveItems<T> {
     priv ZeroIterator,
     priv OneIterator(T),
-    priv ManyIterator(vec::MoveItems<T>),
+    priv ManyIterator(vec_ng::MoveItems<T>),
 }
 
 impl<T> Iterator<T> for MoveItems<T> {
@@ -136,13 +138,15 @@ impl<T> Iterator<T> for MoveItems<T> {
 mod test {
     use super::*;
 
+    use std::vec_ng::Vec;
+
     #[test]
     fn test_len() {
         let v: SmallVector<int> = SmallVector::zero();
         assert_eq!(0, v.len());
 
         assert_eq!(1, SmallVector::one(1).len());
-        assert_eq!(5, SmallVector::many(~[1, 2, 3, 4, 5]).len());
+        assert_eq!(5, SmallVector::many(vec!(1, 2, 3, 4, 5)).len());
     }
 
     #[test]
@@ -161,7 +165,7 @@ mod test {
 
     #[test]
     fn test_from_iterator() {
-        let v: SmallVector<int> = (~[1, 2, 3]).move_iter().collect();
+        let v: SmallVector<int> = (vec!(1, 2, 3)).move_iter().collect();
         assert_eq!(3, v.len());
         assert_eq!(&1, v.get(0));
         assert_eq!(&2, v.get(1));
@@ -171,14 +175,14 @@ mod test {
     #[test]
     fn test_move_iter() {
         let v = SmallVector::zero();
-        let v: ~[int] = v.move_iter().collect();
-        assert_eq!(~[], v);
+        let v: Vec<int> = v.move_iter().collect();
+        assert_eq!(Vec::new(), v);
 
         let v = SmallVector::one(1);
-        assert_eq!(~[1], v.move_iter().collect());
+        assert_eq!(vec!(1), v.move_iter().collect());
 
-        let v = SmallVector::many(~[1, 2, 3]);
-        assert_eq!(~[1, 2, 3], v.move_iter().collect());
+        let v = SmallVector::many(vec!(1, 2, 3));
+        assert_eq!(vec!(1, 2, 3), v.move_iter().collect());
     }
 
     #[test]
@@ -190,12 +194,12 @@ mod test {
     #[test]
     #[should_fail]
     fn test_expect_one_many() {
-        SmallVector::many(~[1, 2]).expect_one("");
+        SmallVector::many(vec!(1, 2)).expect_one("");
     }
 
     #[test]
     fn test_expect_one_one() {
         assert_eq!(1, SmallVector::one(1).expect_one(""));
-        assert_eq!(1, SmallVector::many(~[1]).expect_one(""));
+        assert_eq!(1, SmallVector::many(vec!(1)).expect_one(""));
     }
 }
diff --git a/src/libsyntax/visit.rs b/src/libsyntax/visit.rs
index 39989977d69fa..2edfd367f4ef2 100644
--- a/src/libsyntax/visit.rs
+++ b/src/libsyntax/visit.rs
@@ -637,7 +637,7 @@ pub fn walk_expr<E: Clone, V: Visitor<E>>(visitor: &mut V, expression: &Expr, en
             visitor.visit_expr(subexpression, env.clone())
         }
         ExprVec(ref subexpressions, _) => {
-            walk_exprs(visitor, *subexpressions, env.clone())
+            walk_exprs(visitor, subexpressions.as_slice(), env.clone())
         }
         ExprRepeat(element, count, _) => {
             visitor.visit_expr(element, env.clone());
@@ -662,7 +662,7 @@ pub fn walk_expr<E: Clone, V: Visitor<E>>(visitor: &mut V, expression: &Expr, en
             visitor.visit_expr(callee_expression, env.clone())
         }
         ExprMethodCall(_, ref types, ref arguments) => {
-            walk_exprs(visitor, *arguments, env.clone());
+            walk_exprs(visitor, arguments.as_slice(), env.clone());
             for &typ in types.iter() {
                 visitor.visit_ty(typ, env.clone())
             }