rollup merge of #20410: japaric/assoc-types

Conflicts:
	src/liballoc/lib.rs
	src/libcollections/lib.rs
	src/libcollections/slice.rs
	src/libcore/ops.rs
	src/libcore/prelude.rs
	src/libcore/ptr.rs
	src/librustc/middle/traits/project.rs
	src/libstd/c_str.rs
	src/libstd/io/mem.rs
	src/libstd/io/mod.rs
	src/libstd/lib.rs
	src/libstd/path/posix.rs
	src/libstd/path/windows.rs
	src/libstd/prelude.rs
	src/libstd/rt/exclusive.rs
	src/libsyntax/lib.rs
	src/test/compile-fail/issue-18566.rs
	src/test/run-pass/deref-mut-on-ref.rs
	src/test/run-pass/deref-on-ref.rs
	src/test/run-pass/dst-deref-mut.rs
	src/test/run-pass/dst-deref.rs
	src/test/run-pass/fixup-deref-mut.rs
	src/test/run-pass/issue-13264.rs
	src/test/run-pass/overloaded-autoderef-indexing.rs

Author: alexcrichton

src/liballoc/arc.rs

@@ -247,7 +247,9 @@ impl<T> BorrowFrom<Arc<T>> for T {
 }
 
 #[experimental = "Deref is experimental."]
-impl<T> Deref<T> for Arc<T> {
+impl<T> Deref for Arc<T> {
+    type Target = T;
+
     #[inline]
     fn deref(&self) -> &T {
         &self.inner().data

src/liballoc/boxed.rs

@@ -155,11 +155,13 @@ impl fmt::Show for Box<Any> {
     }
 }
 
-impl<Sized? T> Deref<T> for Box<T> {
+impl<Sized? T> Deref for Box<T> {
+    type Target = T;
+
     fn deref(&self) -> &T { &**self }
 }
 
-impl<Sized? T> DerefMut<T> for Box<T> {
+impl<Sized? T> DerefMut for Box<T> {
     fn deref_mut(&mut self) -> &mut T { &mut **self }
 }
 
@@ -212,7 +214,7 @@ mod test {
 
     #[test]
     fn deref() {
-        fn homura<T: Deref<i32>>(_: T) { }
+        fn homura<T: Deref<Target=i32>>(_: T) { }
         homura(box 765i32);
     }
 }

src/liballoc/lib.rs

@@ -66,6 +66,7 @@
 #![no_std]
 #![allow(unknown_features)]
 #![feature(lang_items, phase, unsafe_destructor, default_type_params, old_orphan_check)]
+#![feature(associated_types)]
 
 #[phase(plugin, link)]
 extern crate core;

src/liballoc/rc.rs

@@ -355,7 +355,9 @@ impl<T> BorrowFrom<Rc<T>> for T {
 }
 
 #[experimental = "Deref is experimental."]
-impl<T> Deref<T> for Rc<T> {
+impl<T> Deref for Rc<T> {
+    type Target = T;
+
     #[inline(always)]
     fn deref(&self) -> &T {
         &self.inner().value

src/libcollections/btree/map.rs

@@ -518,13 +518,15 @@ mod stack {
         marker: marker::InvariantLifetime<'id>
     }
 
-    impl<'id, T> Deref<T> for IdRef<'id, T> {
+    impl<'id, T> Deref for IdRef<'id, T> {
+        type Target = T;
+
         fn deref(&self) -> &T {
             &*self.inner
         }
     }
 
-    impl<'id, T> DerefMut<T> for IdRef<'id, T> {
+    impl<'id, T> DerefMut for IdRef<'id, T> {
         fn deref_mut(&mut self) -> &mut T {
             &mut *self.inner
         }

src/libcollections/btree/node.rs

@@ -457,7 +457,9 @@ impl<K: Clone, V: Clone> Clone for Node<K, V> {
 ///     flag: &'a Cell<bool>,
 /// }
 ///
-/// impl<'a> Deref<Node<uint, uint>> for Nasty<'a> {
+/// impl<'a> Deref for Nasty<'a> {
+///     type Target = Node<uint, uint>;
+///
 ///     fn deref(&self) -> &Node<uint, uint> {
 ///         if self.flag.get() {
 ///             &*self.second
@@ -513,7 +515,7 @@ impl<K: Ord, V> Node<K, V> {
     /// Searches for the given key in the node. If it finds an exact match,
     /// `Found` will be yielded with the matching index. If it doesn't find an exact match,
     /// `GoDown` will be yielded with the index of the subtree the key must lie in.
-    pub fn search<Sized? Q, NodeRef: Deref<Node<K, V>>>(node: NodeRef, key: &Q)
+    pub fn search<Sized? Q, NodeRef: Deref<Target=Node<K, V>>>(node: NodeRef, key: &Q)
                   -> SearchResult<NodeRef> where Q: BorrowFrom<K> + Ord {
         // FIXME(Gankro): Tune when to search linear or binary based on B (and maybe K/V).
         // For the B configured as of this writing (B = 6), binary search was *significantly*
@@ -590,7 +592,7 @@ impl <K, V> Node<K, V> {
     }
 }
 
-impl<K, V, NodeRef: Deref<Node<K, V>>, Type, NodeType> Handle<NodeRef, Type, NodeType> {
+impl<K, V, NodeRef: Deref<Target=Node<K, V>>, Type, NodeType> Handle<NodeRef, Type, NodeType> {
     /// Returns a reference to the node that contains the pointed-to edge or key/value pair. This
     /// is very different from `edge` and `edge_mut` because those return children of the node
     /// returned by `node`.
@@ -599,7 +601,9 @@ impl<K, V, NodeRef: Deref<Node<K, V>>, Type, NodeType> Handle<NodeRef, Type, Nod
     }
 }
 
-impl<K, V, NodeRef: DerefMut<Node<K, V>>, Type, NodeType> Handle<NodeRef, Type, NodeType> {
+impl<K, V, NodeRef, Type, NodeType> Handle<NodeRef, Type, NodeType> where
+    NodeRef: Deref<Target=Node<K, V>> + DerefMut,
+{
     /// Converts a handle into one that stores the same information using a raw pointer. This can
     /// be useful in conjunction with `from_raw` when the type system is insufficient for
     /// determining the lifetimes of the nodes.
@@ -655,7 +659,7 @@ impl<'a, K: 'a, V: 'a> Handle<&'a mut Node<K, V>, handle::Edge, handle::Internal
     }
 }
 
-impl<K, V, NodeRef: Deref<Node<K, V>>> Handle<NodeRef, handle::Edge, handle::Internal> {
+impl<K, V, NodeRef: Deref<Target=Node<K, V>>> Handle<NodeRef, handle::Edge, handle::Internal> {
     // This doesn't exist because there are no uses for it,
     // but is fine to add, analagous to edge_mut.
     //
@@ -669,7 +673,7 @@ pub enum ForceResult<NodeRef, Type> {
     Internal(Handle<NodeRef, Type, handle::Internal>)
 }
 
-impl<K, V, NodeRef: Deref<Node<K, V>>, Type> Handle<NodeRef, Type, handle::LeafOrInternal> {
+impl<K, V, NodeRef: Deref<Target=Node<K, V>>, Type> Handle<NodeRef, Type, handle::LeafOrInternal> {
     /// Figure out whether this handle is pointing to something in a leaf node or to something in
     /// an internal node, clarifying the type according to the result.
     pub fn force(self) -> ForceResult<NodeRef, Type> {
@@ -686,8 +690,9 @@ impl<K, V, NodeRef: Deref<Node<K, V>>, Type> Handle<NodeRef, Type, handle::LeafO
         }
     }
 }
-
-impl<K, V, NodeRef: DerefMut<Node<K, V>>> Handle<NodeRef, handle::Edge, handle::Leaf> {
+impl<K, V, NodeRef> Handle<NodeRef, handle::Edge, handle::Leaf> where
+    NodeRef: Deref<Target=Node<K, V>> + DerefMut,
+{
     /// Tries to insert this key-value pair at the given index in this leaf node
     /// If the node is full, we have to split it.
     ///
@@ -719,7 +724,9 @@ impl<K, V, NodeRef: DerefMut<Node<K, V>>> Handle<NodeRef, handle::Edge, handle::
     }
 }
 
-impl<K, V, NodeRef: DerefMut<Node<K, V>>> Handle<NodeRef, handle::Edge, handle::Internal> {
+impl<K, V, NodeRef> Handle<NodeRef, handle::Edge, handle::Internal> where
+    NodeRef: Deref<Target=Node<K, V>> + DerefMut,
+{
     /// Returns a mutable reference to the edge pointed-to by this handle. This should not be
     /// confused with `node`, which references the parent node of what is returned here.
     pub fn edge_mut(&mut self) -> &mut Node<K, V> {
@@ -802,7 +809,9 @@ impl<K, V, NodeRef: DerefMut<Node<K, V>>> Handle<NodeRef, handle::Edge, handle::
     }
 }
 
-impl<K, V, NodeRef: DerefMut<Node<K, V>>, NodeType> Handle<NodeRef, handle::Edge, NodeType> {
+impl<K, V, NodeRef, NodeType> Handle<NodeRef, handle::Edge, NodeType> where
+    NodeRef: Deref<Target=Node<K, V>> + DerefMut,
+{
     /// Gets the handle pointing to the key/value pair just to the left of the pointed-to edge.
     /// This is unsafe because the handle might point to the first edge in the node, which has no
     /// pair to its left.
@@ -864,7 +873,7 @@ impl<'a, K: 'a, V: 'a, NodeType> Handle<&'a mut Node<K, V>, handle::KV, NodeType
     }
 }
 
-impl<'a, K: 'a, V: 'a, NodeRef: Deref<Node<K, V>> + 'a, NodeType> Handle<NodeRef, handle::KV,
+impl<'a, K: 'a, V: 'a, NodeRef: Deref<Target=Node<K, V>> + 'a, NodeType> Handle<NodeRef, handle::KV,
                                                                          NodeType> {
     // These are fine to include, but are currently unneeded.
     //
@@ -883,8 +892,9 @@ impl<'a, K: 'a, V: 'a, NodeRef: Deref<Node<K, V>> + 'a, NodeType> Handle<NodeRef
     // }
 }
 
-impl<'a, K: 'a, V: 'a, NodeRef: DerefMut<Node<K, V>> + 'a, NodeType> Handle<NodeRef, handle::KV,
-                                                                            NodeType> {
+impl<'a, K: 'a, V: 'a, NodeRef, NodeType> Handle<NodeRef, handle::KV, NodeType> where
+    NodeRef: 'a + Deref<Target=Node<K, V>> + DerefMut,
+{
     /// Returns a mutable reference to the key pointed-to by this handle. This doesn't return a
     /// reference with a lifetime as large as `into_kv_mut`, but it also does not consume the
     /// handle.
@@ -900,7 +910,9 @@ impl<'a, K: 'a, V: 'a, NodeRef: DerefMut<Node<K, V>> + 'a, NodeType> Handle<Node
     }
 }
 
-impl<K, V, NodeRef: DerefMut<Node<K, V>>, NodeType> Handle<NodeRef, handle::KV, NodeType> {
+impl<K, V, NodeRef, NodeType> Handle<NodeRef, handle::KV, NodeType> where
+    NodeRef: Deref<Target=Node<K, V>> + DerefMut,
+{
     /// Gets the handle pointing to the edge immediately to the left of the key/value pair pointed
     /// to by this handle.
     pub fn left_edge<'a>(&'a mut self) -> Handle<&'a mut Node<K, V>, handle::Edge, NodeType> {
@@ -920,7 +932,9 @@ impl<K, V, NodeRef: DerefMut<Node<K, V>>, NodeType> Handle<NodeRef, handle::KV,
     }
 }
 
-impl<K, V, NodeRef: DerefMut<Node<K, V>>> Handle<NodeRef, handle::KV, handle::Leaf> {
+impl<K, V, NodeRef> Handle<NodeRef, handle::KV, handle::Leaf> where
+    NodeRef: Deref<Target=Node<K, V>> + DerefMut,
+{
     /// Removes the key/value pair at the handle's location.
     ///
     /// # Panics (in debug build)
@@ -931,7 +945,9 @@ impl<K, V, NodeRef: DerefMut<Node<K, V>>> Handle<NodeRef, handle::KV, handle::Le
     }
 }
 
-impl<K, V, NodeRef: DerefMut<Node<K, V>>> Handle<NodeRef, handle::KV, handle::Internal> {
+impl<K, V, NodeRef> Handle<NodeRef, handle::KV, handle::Internal> where
+    NodeRef: Deref<Target=Node<K, V>> + DerefMut
+{
     /// Steal! Stealing is roughly analogous to a binary tree rotation.
     /// In this case, we're "rotating" right.
     unsafe fn steal_rightward(&mut self) {

src/libcollections/lib.rs

@@ -26,6 +26,7 @@
 #![feature(unsafe_destructor, slicing_syntax)]
 #![feature(unboxed_closures)]
 #![feature(old_orphan_check)]
+#![feature(associated_types)]
 #![no_std]
 
 #[phase(plugin, link)] extern crate core;
@@ -121,7 +122,6 @@ mod prelude {
     pub use core::result::Result::{Ok, Err};
 
     // in core and collections (may differ).
-    pub use slice::{PartialEqSliceExt, OrdSliceExt};
     pub use slice::{AsSlice, SliceExt};
     pub use str::{from_str, Str, StrExt};
 
@@ -130,7 +130,7 @@ mod prelude {
     pub use unicode::char::UnicodeChar;
 
     // from collections.
-    pub use slice::{CloneSliceExt, SliceConcatExt};
+    pub use slice::SliceConcatExt;
     pub use str::IntoMaybeOwned;
     pub use string::{String, ToString};
     pub use vec::Vec;