Issue #5656: Make &self not mean "&'self self"

Fixes #5656.
Fixes #5541.

src/libsyntax/ast.rs

@@ -1002,15 +1002,6 @@ pub enum self_ty_ {
     sty_uniq(mutability)                       // `~self`
 }
 
-impl self_ty_ {
-    fn is_borrowed(&self) -> bool {
-        match *self {
-            sty_region(*) => true,
-            _ => false
-        }
-    }
-}
-
 pub type self_ty = spanned<self_ty_>;
 
 #[auto_encode]

src/libsyntax/ext/base.rs

@@ -454,6 +454,7 @@ impl <K: Eq + Hash + IterBytes ,V: Copy> MapChain<K,V>{
 
     // ugh: can't get this to compile with mut because of the
     // lack of flow sensitivity.
+    #[cfg(stage0)]
     fn get_map(&self) -> &'self HashMap<K,@V> {
         match *self {
             BaseMapChain (~ref map) => map,
@@ -461,6 +462,18 @@ impl <K: Eq + Hash + IterBytes ,V: Copy> MapChain<K,V>{
         }
     }
 
+    // ugh: can't get this to compile with mut because of the
+    // lack of flow sensitivity.
+    #[cfg(stage1)]
+    #[cfg(stage2)]
+    #[cfg(stage3)]
+    fn get_map<'a>(&'a self) -> &'a HashMap<K,@V> {
+        match *self {
+            BaseMapChain (~ref map) => map,
+            ConsMapChain (~ref map,_) => map
+        }
+    }
+
 // traits just don't work anywhere...?
 //pub impl Map<Name,SyntaxExtension> for MapChain {
 

src/libsyntax/opt_vec.rs

@@ -61,6 +61,7 @@ impl<T> OptVec<T> {
         }
     }
 
+    #[cfg(stage0)]
     fn get(&self, i: uint) -> &'self T {
         match *self {
             Empty => fail!(fmt!("Invalid index %u", i)),
@@ -68,6 +69,16 @@ impl<T> OptVec<T> {
         }
     }
 
+    #[cfg(stage1)]
+    #[cfg(stage2)]
+    #[cfg(stage3)]
+    fn get<'a>(&'a self, i: uint) -> &'a T {
+        match *self {
+            Empty => fail!(fmt!("Invalid index %u", i)),
+            Vec(ref v) => &v[i]
+        }
+    }
+
     fn is_empty(&self) -> bool {
         self.len() == 0
     }

src/libsyntax/print/pprust.rs

@@ -1633,6 +1633,10 @@ pub fn print_pat(s: @ps, &&pat: @ast::pat, refutable: bool) {
     (s.ann.post)(ann_node);
 }
 
+pub fn self_ty_to_str(self_ty: ast::self_ty_, intr: @ident_interner) -> ~str {
+    to_str(self_ty, |a, b| { print_self_ty(a, b); () }, intr)
+}
+
 // Returns whether it printed anything
 pub fn print_self_ty(s: @ps, self_ty: ast::self_ty_) -> bool {
     match self_ty {