Rollup of 4 pull requests

Cargo.lock

@@ -1520,7 +1520,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "minifier"
-version = "0.0.28"
+version = "0.0.29"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "macro-utils 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3039,7 +3039,7 @@ dependencies = [
 name = "rustdoc"
 version = "0.0.0"
 dependencies = [
- "minifier 0.0.28 (registry+https://github.com/rust-lang/crates.io-index)",
+ "minifier 0.0.29 (registry+https://github.com/rust-lang/crates.io-index)",
  "parking_lot 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "pulldown-cmark 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "tempfile 3.0.5 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -4149,7 +4149,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum memchr 2.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "0a3eb002f0535929f1199681417029ebea04aadc0c7a4224b46be99c7f5d6a16"
 "checksum memmap 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)" = "e2ffa2c986de11a9df78620c01eeaaf27d94d3ff02bf81bfcca953102dd0c6ff"
 "checksum memoffset 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "0f9dc261e2b62d7a622bf416ea3c5245cdd5d9a7fcc428c0d06804dfce1775b3"
-"checksum minifier 0.0.28 (registry+https://github.com/rust-lang/crates.io-index)" = "3a2898502751dcc9d66b6fff57f3cf63cc91605e83e1a33515396f5027f8e4ca"
+"checksum minifier 0.0.29 (registry+https://github.com/rust-lang/crates.io-index)" = "1f4950cb2617b1933e2da0446e864dfe0d6a22c22ff72297996c46e6a63b210b"
 "checksum miniz-sys 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)" = "0300eafb20369952951699b68243ab4334f4b10a88f411c221d444b36c40e649"
 "checksum miniz_oxide 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "5ad30a47319c16cde58d0314f5d98202a80c9083b5f61178457403dfb14e509c"
 "checksum miniz_oxide_c_api 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "28edaef377517fd9fe3e085c37d892ce7acd1fbeab9239c5a36eec352d8a8b7e"

src/bootstrap/builder.rs

@@ -634,7 +634,28 @@ impl<'a> Builder<'a> {
         if compiler.is_snapshot(self) {
             self.rustc_snapshot_libdir()
         } else {
-            self.sysroot(compiler).join(libdir(&compiler.host))
+            match self.config.libdir_relative() {
+                Some(relative_libdir) if compiler.stage >= 1
+                    => self.sysroot(compiler).join(relative_libdir),
+                _ => self.sysroot(compiler).join(libdir(&compiler.host))
+            }
+        }
+    }
+
+    /// Returns the compiler's relative libdir where it stores the dynamic libraries that
+    /// it itself links against.
+    ///
+    /// For example this returns `lib` on Unix and `bin` on
+    /// Windows.
+    pub fn libdir_relative(&self, compiler: Compiler) -> &Path {
+        if compiler.is_snapshot(self) {
+            libdir(&self.config.build).as_ref()
+        } else {
+            match self.config.libdir_relative() {
+                Some(relative_libdir) if compiler.stage >= 1
+                    => relative_libdir,
+                _ => libdir(&compiler.host).as_ref()
+            }
         }
     }
 

src/bootstrap/compile.rs

@@ -20,7 +20,7 @@ use filetime::FileTime;
 use serde_json;
 
 use crate::dist;
-use crate::util::{exe, libdir, is_dylib};
+use crate::util::{exe, is_dylib};
 use crate::{Compiler, Mode, GitRepo};
 use crate::native;
 
@@ -1005,13 +1005,13 @@ impl Step for Assemble {
 
         // Link in all dylibs to the libdir
         let sysroot = builder.sysroot(target_compiler);
-        let sysroot_libdir = sysroot.join(libdir(&*host));
-        t!(fs::create_dir_all(&sysroot_libdir));
+        let rustc_libdir = builder.rustc_libdir(target_compiler);
+        t!(fs::create_dir_all(&rustc_libdir));
         let src_libdir = builder.sysroot_libdir(build_compiler, host);
         for f in builder.read_dir(&src_libdir) {
             let filename = f.file_name().into_string().unwrap();
             if is_dylib(&filename) {
-                builder.copy(&f.path(), &sysroot_libdir.join(&filename));
+                builder.copy(&f.path(), &rustc_libdir.join(&filename));
             }
         }
 

src/bootstrap/dist.rs

@@ -18,7 +18,7 @@ use build_helper::output;
 
 use crate::{Compiler, Mode, LLVM_TOOLS};
 use crate::channel;
-use crate::util::{libdir, is_dylib, exe};
+use crate::util::{is_dylib, exe};
 use crate::builder::{Builder, RunConfig, ShouldRun, Step};
 use crate::compile;
 use crate::tool::{self, Tool};
@@ -473,21 +473,23 @@ impl Step for Rustc {
         fn prepare_image(builder: &Builder<'_>, compiler: Compiler, image: &Path) {
             let host = compiler.host;
             let src = builder.sysroot(compiler);
-            let libdir = libdir(&host);
+            let libdir = builder.rustc_libdir(compiler);
 
             // Copy rustc/rustdoc binaries
             t!(fs::create_dir_all(image.join("bin")));
             builder.cp_r(&src.join("bin"), &image.join("bin"));
 
             builder.install(&builder.rustdoc(compiler), &image.join("bin"), 0o755);
 
+            let libdir_relative = builder.libdir_relative(compiler);
+
             // Copy runtime DLLs needed by the compiler
-            if libdir != "bin" {
-                for entry in builder.read_dir(&src.join(libdir)) {
+            if libdir_relative.to_str() != Some("bin") {
+                for entry in builder.read_dir(&libdir) {
                     let name = entry.file_name();
                     if let Some(s) = name.to_str() {
                         if is_dylib(s) {
-                            builder.install(&entry.path(), &image.join(libdir), 0o644);
+                            builder.install(&entry.path(), &image.join(&libdir_relative), 0o644);
                         }
                     }
                 }
@@ -516,7 +518,8 @@ impl Step for Rustc {
                     .join("bin")
                     .join(&exe);
                 // for the rationale about this rename check `compile::copy_lld_to_sysroot`
-                let dst = image.join("lib/rustlib")
+                let dst = image.join(libdir_relative)
+                    .join("rustlib")
                     .join(&*host)
                     .join("bin")
                     .join(&exe);

src/bootstrap/lib.rs

@@ -1275,6 +1275,7 @@ impl Build {
     fn install(&self, src: &Path, dstdir: &Path, perms: u32) {
         if self.config.dry_run { return; }
         let dst = dstdir.join(src.file_name().unwrap());
+        self.verbose_than(1, &format!("Install {:?} to {:?}", src, dst));
         t!(fs::create_dir_all(dstdir));
         drop(fs::remove_file(&dst));
         {

src/librustc_resolve/lib.rs

@@ -1352,7 +1352,7 @@ impl<'a> NameBinding<'a> {
         }
     }
 
-    // We sometimes need to treat variants as `pub` for backwards compatibility
+    // We sometimes need to treat variants as `pub` for backwards compatibility.
     fn pseudo_vis(&self) -> ty::Visibility {
         if self.is_variant() && self.def().def_id().is_local() {
             ty::Visibility::Public
@@ -2714,7 +2714,7 @@ impl<'a> Resolver<'a> {
     {
         let mut self_type_rib = Rib::new(NormalRibKind);
 
-        // plain insert (no renaming, types are not currently hygienic....)
+        // Plain insert (no renaming, since types are not currently hygienic)
         self_type_rib.bindings.insert(keywords::SelfUpper.ident(), self_def);
         self.ribs[TypeNS].push(self_type_rib);
         f(self);
@@ -4438,26 +4438,47 @@ impl<'a> Resolver<'a> {
             let mut collected_traits = Vec::new();
             module.for_each_child(|name, ns, binding| {
                 if ns != TypeNS { return }
-                if let Def::Trait(_) = binding.def() {
-                    collected_traits.push((name, binding));
+                match binding.def() {
+                    Def::Trait(_) |
+                    Def::TraitAlias(_) => collected_traits.push((name, binding)),
+                    _ => (),
                 }
             });
             *traits = Some(collected_traits.into_boxed_slice());
         }
 
         for &(trait_name, binding) in traits.as_ref().unwrap().iter() {
-            let module = binding.module().unwrap();
-            let mut ident = ident;
-            if ident.span.glob_adjust(module.expansion, binding.span.ctxt().modern()).is_none() {
-                continue
-            }
-            if self.resolve_ident_in_module_unadjusted(
-                ModuleOrUniformRoot::Module(module),
-                ident,
-                ns,
-                false,
-                module.span,
-            ).is_ok() {
+            // Traits have pseudo-modules that can be used to search for the given ident.
+            if let Some(module) = binding.module() {
+                let mut ident = ident;
+                if ident.span.glob_adjust(
+                    module.expansion,
+                    binding.span.ctxt().modern(),
+                ).is_none() {
+                    continue
+                }
+                if self.resolve_ident_in_module_unadjusted(
+                    ModuleOrUniformRoot::Module(module),
+                    ident,
+                    ns,
+                    false,
+                    module.span,
+                ).is_ok() {
+                    let import_id = match binding.kind {
+                        NameBindingKind::Import { directive, .. } => {
+                            self.maybe_unused_trait_imports.insert(directive.id);
+                            self.add_to_glob_map(&directive, trait_name);
+                            Some(directive.id)
+                        }
+                        _ => None,
+                    };
+                    let trait_def_id = module.def_id().unwrap();
+                    found_traits.push(TraitCandidate { def_id: trait_def_id, import_id });
+                }
+            } else if let Def::TraitAlias(_) = binding.def() {
+                // For now, just treat all trait aliases as possible candidates, since we don't
+                // know if the ident is somewhere in the transitive bounds.
+
                 let import_id = match binding.kind {
                     NameBindingKind::Import { directive, .. } => {
                         self.maybe_unused_trait_imports.insert(directive.id);
@@ -4466,8 +4487,10 @@ impl<'a> Resolver<'a> {
                     }
                     _ => None,
                 };
-                let trait_def_id = module.def_id().unwrap();
-                found_traits.push(TraitCandidate { def_id: trait_def_id, import_id: import_id });
+                let trait_def_id = binding.def().def_id();
+                found_traits.push(TraitCandidate { def_id: trait_def_id, import_id });
+            } else {
+                bug!("candidate is not trait or trait alias?")
             }
         }
     }

src/librustc_resolve/resolve_imports.rs

@@ -1334,7 +1334,7 @@ impl<'a, 'b:'a> ImportResolver<'a, 'b> {
 
         self.populate_module_if_necessary(module);
 
-        if let Some(Def::Trait(_)) = module.def() {
+        if module.is_trait() {
             self.session.span_err(directive.span, "items in traits are not importable.");
             return;
         } else if module.def_id() == directive.parent_scope.module.def_id()  {

src/librustc_typeck/check/method/probe.rs

@@ -896,20 +896,36 @@ impl<'a, 'gcx, 'tcx> ProbeContext<'a, 'gcx, 'tcx> {
         let trait_substs = self.fresh_item_substs(trait_def_id);
         let trait_ref = ty::TraitRef::new(trait_def_id, trait_substs);
 
-        for item in self.impl_or_trait_item(trait_def_id) {
-            // Check whether `trait_def_id` defines a method with suitable name:
-            if !self.has_applicable_self(&item) {
-                debug!("method has inapplicable self");
-                self.record_static_candidate(TraitSource(trait_def_id));
-                continue;
-            }
+        if self.tcx.is_trait_alias(trait_def_id) {
+            // For trait aliases, assume all super-traits are relevant.
+            let bounds = iter::once(trait_ref.to_poly_trait_ref());
+            self.elaborate_bounds(bounds, |this, new_trait_ref, item| {
+                let new_trait_ref = this.erase_late_bound_regions(&new_trait_ref);
+
+                let (xform_self_ty, xform_ret_ty) =
+                    this.xform_self_ty(&item, new_trait_ref.self_ty(), new_trait_ref.substs);
+                this.push_candidate(Candidate {
+                    xform_self_ty, xform_ret_ty, item, import_id,
+                    kind: TraitCandidate(new_trait_ref),
+                }, true);
+            });
+        } else {
+            debug_assert!(self.tcx.is_trait(trait_def_id));
+            for item in self.impl_or_trait_item(trait_def_id) {
+                // Check whether `trait_def_id` defines a method with suitable name.
+                if !self.has_applicable_self(&item) {
+                    debug!("method has inapplicable self");
+                    self.record_static_candidate(TraitSource(trait_def_id));
+                    continue;
+                }
 
-            let (xform_self_ty, xform_ret_ty) =
-                self.xform_self_ty(&item, trait_ref.self_ty(), trait_substs);
-            self.push_candidate(Candidate {
-                xform_self_ty, xform_ret_ty, item, import_id,
-                kind: TraitCandidate(trait_ref),
-            }, false);
+                let (xform_self_ty, xform_ret_ty) =
+                    self.xform_self_ty(&item, trait_ref.self_ty(), trait_substs);
+                self.push_candidate(Candidate {
+                    xform_self_ty, xform_ret_ty, item, import_id,
+                    kind: TraitCandidate(trait_ref),
+                }, false);
+            }
         }
         Ok(())
     }
@@ -930,7 +946,7 @@ impl<'a, 'gcx, 'tcx> ProbeContext<'a, 'gcx, 'tcx> {
             .filter(|&name| set.insert(name))
             .collect();
 
-        // sort them by the name so we have a stable result
+        // Sort them by the name so we have a stable result.
         names.sort_by_cached_key(|n| n.as_str());
         names
     }
@@ -945,6 +961,8 @@ impl<'a, 'gcx, 'tcx> ProbeContext<'a, 'gcx, 'tcx> {
             return r;
         }
 
+        debug!("pick: actual search failed, assemble diagnotics");
+
         let static_candidates = mem::replace(&mut self.static_candidates, vec![]);
         let private_candidate = self.private_candidate.take();
         let unsatisfied_predicates = mem::replace(&mut self.unsatisfied_predicates, vec![]);

src/librustc_typeck/check/method/suggest.rs

@@ -757,9 +757,13 @@ fn compute_all_traits<'a, 'gcx, 'tcx>(tcx: TyCtxt<'a, 'gcx, 'tcx>) -> Vec<DefId>
 
     impl<'v, 'a, 'tcx> itemlikevisit::ItemLikeVisitor<'v> for Visitor<'a, 'tcx> {
         fn visit_item(&mut self, i: &'v hir::Item) {
-            if let hir::ItemKind::Trait(..) = i.node {
-                let def_id = self.map.local_def_id_from_hir_id(i.hir_id);
-                self.traits.push(def_id);
+            match i.node {
+                hir::ItemKind::Trait(..) |
+                hir::ItemKind::TraitAlias(..) => {
+                    let def_id = self.map.local_def_id_from_hir_id(i.hir_id);
+                    self.traits.push(def_id);
+                }
+                _ => ()
             }
         }
 
@@ -781,7 +785,8 @@ fn compute_all_traits<'a, 'gcx, 'tcx>(tcx: TyCtxt<'a, 'gcx, 'tcx>) -> Vec<DefId>
                            external_mods: &mut FxHashSet<DefId>,
                            def: Def) {
         match def {
-            Def::Trait(def_id) => {
+            Def::Trait(def_id) |
+            Def::TraitAlias(def_id) => {
                 traits.push(def_id);
             }
             Def::Mod(def_id) => {

src/librustdoc/Cargo.toml

@@ -10,6 +10,6 @@ path = "lib.rs"
 
 [dependencies]
 pulldown-cmark = { version = "0.1.2", default-features = false }
-minifier = "0.0.28"
+minifier = "0.0.29"
 tempfile = "3"
 parking_lot = "0.7"