auto merge of #4874 : thestinger/rust/option, r=catamorphism

Author: bors

src/libcore/option.rs

@@ -201,7 +201,7 @@ pub pure fn map_default<T, U>(opt: &r/Option<T>, def: U,
 }
 
 #[inline(always)]
-pub pure fn iter<T>(opt: &Option<T>, f: fn(x: &T)) {
+pub pure fn iter<T>(opt: &r/Option<T>, f: fn(x: &r/T)) {
     //! Performs an operation on the contained value by reference
     match *opt { None => (), Some(ref t) => f(t) }
 }
@@ -313,7 +313,7 @@ impl<T> Option<T> {
 
     /// Performs an operation on the contained value by reference
     #[inline(always)]
-    pure fn iter(&self, f: fn(x: &T)) { iter(self, f) }
+    pure fn iter(&self, f: fn(x: &self/T)) { iter(self, f) }
 
     /**
     Gets an immutable reference to the value inside an option.

src/libstd/treemap.rs

@@ -561,18 +561,18 @@ impl <K: Ord, V> TreeNode<K, V> {
 
 pure fn each<K: Ord, V>(node: &r/Option<~TreeNode<K, V>>,
                         f: fn(&(&r/K, &r/V)) -> bool) {
-    do node.map |x| {
+    do node.iter |x| {
         each(&x.left, f);
         if f(&(&x.key, &x.value)) { each(&x.right, f) }
-    };
+    }
 }
 
 pure fn each_reverse<K: Ord, V>(node: &r/Option<~TreeNode<K, V>>,
                                 f: fn(&(&r/K, &r/V)) -> bool) {
-    do node.map |x| {
+    do node.iter |x| {
         each_reverse(&x.right, f);
         if f(&(&x.key, &x.value)) { each_reverse(&x.left, f) }
-    };
+    }
 }
 
 // Remove left horizontal link by rotating right