remove issue #3148 workarounds (no longer needed)

src/libcore/hashmap.rs

@@ -49,9 +49,8 @@ pub mod linear {
         buckets: ~[Option<Bucket<K, V>>],
     }
 
-    // FIXME(#3148) -- we could rewrite FoundEntry
+    // We could rewrite FoundEntry to have type Option<&Bucket<K, V>>
-    // to have type Option<&Bucket<K, V>> which would be nifty
+    // which would be nifty
-    // However, that won't work until #3148 is fixed
     enum SearchResult {
         FoundEntry(uint), FoundHole(uint), TableFull
     }
@@ -296,8 +295,6 @@ pub mod linear {
                 FoundEntry(idx) => {
                     match self.buckets[idx] {
                         Some(ref bkt) => {
-                            // FIXME(#3148)---should be inferred
-                            let bkt: &self/Bucket<K, V> = bkt;
                             Some(&bkt.value)
                         }
                         None => {

src/libstd/json.rs

@@ -856,9 +856,6 @@ pub impl Decoder: serialize::Decoder {
         debug!("read_vec_elt(idx=%u)", idx);
         match *self.peek() {
             List(ref list) => {
-                // FIXME(#3148)---should be inferred
-                let list: &self/~[Json] = list;
-
                 self.stack.push(&list[idx]);
                 f()
             }
@@ -885,9 +882,6 @@ pub impl Decoder: serialize::Decoder {
         let top = self.peek();
         match *top {
             Object(ref obj) => {
-                // FIXME(#3148) This hint should not be necessary.
-                let obj: &self/~Object = obj;
-
                 match obj.find(&name.to_owned()) {
                     None => die!(fmt!("no such field: %s", name)),
                     Some(json) => {
@@ -917,8 +911,6 @@ pub impl Decoder: serialize::Decoder {
         debug!("read_tup_elt(idx=%u)", idx);
         match *self.peek() {
             List(ref list) => {
-                // FIXME(#3148)---should be inferred
-                let list: &self/~[Json] = list;
                 self.stack.push(&list[idx]);
                 f()
             }

src/libstd/treemap.rs

@@ -142,7 +142,6 @@ impl <K: Ord, V> TreeMap<K, V>: Map<K, V> {
         loop {
             match *current {
               Some(ref r) => {
-                let r: &self/~TreeNode<K, V> = r; // FIXME: #3148
                 if *key < r.key {
                     current = &r.left;
                 } else if r.key < *key {