Implement type checking of map literals (issue 221).

runtime/lib/immutable_map.dart

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 // Immutable map class for compiler generated map literals.
 
 class ImmutableMap<K, V> implements Map<K, V> {
   final ImmutableArray kvPairs_;
 
   const ImmutableMap(ImmutableArray keyValuePairs)
       : kvPairs_ = keyValuePairs;
@@ skipping 75 matching lines @@
   V remove(K key) {
     throw const IllegalAccessException();
   }
 
   String toString() {
     // TODO(srdjan): Extend text representation.
     return "ImmutableMap";
   }
 }
 
-
-class MutableMap {
-  // [elements] contains n key-value pairs. The keys are at position
-  // 2*n, the values at position 2*n+1.
-  static fromLiteral(List elements) {
-    var map = new LinkedHashMap();
-    var len = elements.length;
-    for (int i = 1; i < len; i += 2) {
-      map[elements[i-1]] = elements[i];
-    }
-    return map;
-  }
-}