Don't use [operator==] to refer to [==] in DartDoc. It doesn't work.

sdk/lib/collection/maps.dart

 // Copyright (c) 2012, 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.
 
 part of dart.collection;
 
 /**
  * Base class for implementing a [Map].
  *
  * This class has a basic implementation of all but five of the members of
@@ skipping 196 matching lines @@
  *
  * A wrapper around a `Map` that forwards all members to the map provided in
  * the constructor, except for operations that modify the map.
  * Modifying operations throw instead.
  */
 class UnmodifiableMapView<K, V> =
     MapView<K, V> with _UnmodifiableMapMixin<K, V>;
 
 /**
  * Helper class which implements complex [Map] operations
- * in term of basic ones ([Map.keys], [Map.operator []],
- * [Map.operator []=] and [Map.remove].)  Not all methods are
+ * in term of basic ones ([Map.keys], [Map.[]],
+ * [Map.[]=] and [Map.remove].)  Not all methods are
  * necessary to implement each particular operation.
  */
 class Maps {
   static bool containsValue(Map map, Object value) {
     for (final v in map.values) {
       if (v == value) {
         return true;
       }
     }
     return false;
@@ skipping 116 matching lines @@
       map[keyIterator.current] = valueIterator.current;
       hasNextKey = keyIterator.moveNext();
       hasNextValue = valueIterator.moveNext();
     }
 
     if (hasNextKey || hasNextValue) {
       throw new ArgumentError("Iterables do not have same length.");
     }
   }
 }