diff --git a/src/libcore/option.rs b/src/libcore/option.rs
index 1a48f27762580..515f49d6f0bdd 100644
--- a/src/libcore/option.rs
+++ b/src/libcore/option.rs
@@ -66,14 +66,14 @@
 //! not ([`None`]).
 //!
 //! ```
-//! let optional: Option<Box<i32>> = None;
-//! check_optional(&optional);
+//! let optional = None;
+//! check_optional(optional);
 //!
-//! let optional: Option<Box<i32>> = Some(Box::new(9000));
-//! check_optional(&optional);
+//! let optional = Some(Box::new(9000));
+//! check_optional(optional);
 //!
-//! fn check_optional(optional: &Option<Box<i32>>) {
-//!     match *optional {
+//! fn check_optional(optional: Option<Box<i32>>) {
+//!     match optional {
 //!         Some(ref p) => println!("has value {}", p),
 //!         None => println!("has no value"),
 //!     }
diff --git a/src/librustc/ty/context.rs b/src/librustc/ty/context.rs
index 42528aac633cb..c782bea72f4b4 100644
--- a/src/librustc/ty/context.rs
+++ b/src/librustc/ty/context.rs
@@ -482,14 +482,6 @@ pub struct GlobalCtxt<'tcx> {
     /// about.
     pub used_mut_nodes: RefCell<NodeSet>,
 
-    /// The set of external nominal types whose implementations have been read.
-    /// This is used for lazy resolution of methods.
-    pub populated_external_types: RefCell<DefIdSet>,
-
-    /// The set of external primitive types whose implementations have been read.
-    /// FIXME(arielb1): why is this separate from populated_external_types?
-    pub populated_external_primitive_impls: RefCell<DefIdSet>,
-
     /// Maps any item's def-id to its stability index.
     pub stability: RefCell<stability::Index<'tcx>>,
 
@@ -767,8 +759,6 @@ impl<'a, 'gcx, 'tcx> TyCtxt<'a, 'gcx, 'tcx> {
             lang_items: lang_items,
             used_unsafe: RefCell::new(NodeSet()),
             used_mut_nodes: RefCell::new(NodeSet()),
-            populated_external_types: RefCell::new(DefIdSet()),
-            populated_external_primitive_impls: RefCell::new(DefIdSet()),
             stability: RefCell::new(stability),
             selection_cache: traits::SelectionCache::new(),
             evaluation_cache: traits::EvaluationCache::new(),
diff --git a/src/libstd/thread/mod.rs b/src/libstd/thread/mod.rs
index 4e49c485f109f..8e7eaa77cd709 100644
--- a/src/libstd/thread/mod.rs
+++ b/src/libstd/thread/mod.rs
@@ -66,7 +66,7 @@
 //! let res = child.join();
 //! ```
 //!
-//! The [`join`] method returns a [`Result`] containing [`Ok`] of the final
+//! The [`join`] method returns a [`thread::Result`] containing [`Ok`] of the final
 //! value produced by the child thread, or [`Err`] of the value given to
 //! a call to [`panic!`] if the child panicked.
 //!
@@ -159,6 +159,7 @@
 //! [`panic!`]: ../../std/macro.panic.html
 //! [`Builder`]: ../../std/thread/struct.Builder.html
 //! [`thread::current`]: ../../std/thread/fn.current.html
+//! [`thread::Result`]: ../../std/thread/type.Result.html
 //! [`Thread`]: ../../std/thread/struct.Thread.html
 //! [`park`]: ../../std/thread/fn.park.html
 //! [`unpark`]: ../../std/thread/struct.Thread.html#method.unpark
diff --git a/src/libsyntax/parse/lexer/mod.rs b/src/libsyntax/parse/lexer/mod.rs
index c2e5763237d3c..7d2a1b3c4a4d2 100644
--- a/src/libsyntax/parse/lexer/mod.rs
+++ b/src/libsyntax/parse/lexer/mod.rs
@@ -73,7 +73,7 @@ fn mk_sp(lo: BytePos, hi: BytePos) -> Span {
 }
 
 impl<'a> StringReader<'a> {
-    fn next_token(&mut self) -> TokenAndSpan where Self: Sized {
+    fn next_token(&mut self) -> TokenAndSpan {
         let res = self.try_next_token();
         self.unwrap_or_abort(res)
     }