Change === to identical in the dart2js source.

sdk/lib/_internal/compiler/implementation/elements/elements.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.
 
 library elements;
 
 import 'dart:uri';
 
 // TODO(ahe): Rename prefix to 'api' when VM bug is fixed.
 import '../../compiler.dart' as api_e;
@@ skipping 1118 matching lines @@
    */
   // TODO(lrn): Consider using [defaultImplementation] to store the patch.
   FunctionElement patch = null;
   FunctionElement origin = null;
 
   /**
    * If this is a redirecting factory, [defaultImplementation] will be
    * changed by the resolver to point to the redirection target.  If
    * this is an interface constructor, [defaultImplementation] will be
    * changed by the resolver to point to the default implementation.
-   * Otherwise, [:defaultImplementation === this:].
+   * Otherwise, [:identical(defaultImplementation, this):].
    */
   // TODO(ahe): Rename this field to redirectionTarget and remove
   // mention of interface constructors above.
   FunctionElement defaultImplementation;
 
   FunctionElement(SourceString name,
                   ElementKind kind,
                   Modifiers modifiers,
                   Element enclosing)
       : this.tooMuchOverloading(name, null, kind, modifiers, enclosing, null);
@@ skipping 711 matching lines @@
       return const SourceString(r'operator$sub');
     } else if (identical(value, 'unary-')) {
       return const SourceString(r'operator$negate');
     } else {
       return name;
     }
   }
 
   static SourceString constructOperatorName(SourceString op, bool isUnary) {
     String value = op.stringValue;
-    if ((value === '==') ||
-        (value === '~') ||
-        (value === '[]') ||
-        (value === '[]=') ||
-        (value === '*') ||
-        (value === '/') ||
-        (value === '%') ||
-        (value === '~/') ||
-        (value === '+') ||
-        (value === '<<') ||
-        (value === '>>>') ||
-        (value === '>>') ||
-        (value === '>=') ||
-        (value === '>') ||
-        (value === '<=') ||
-        (value === '<') ||
-        (value === '&') ||
-        (value === '^') ||
-        (value === '|')) {
+    if ((identical(value, '==')) ||
+        (identical(value, '~')) ||
+        (identical(value, '[]')) ||
+        (identical(value, '[]=')) ||
+        (identical(value, '*')) ||
+        (identical(value, '/')) ||
+        (identical(value, '%')) ||
+        (identical(value, '~/')) ||
+        (identical(value, '+')) ||
+        (identical(value, '<<')) ||
+        (identical(value, '>>>')) ||
+        (identical(value, '>>')) ||
+        (identical(value, '>=')) ||
+        (identical(value, '>')) ||
+        (identical(value, '<=')) ||
+        (identical(value, '<')) ||
+        (identical(value, '&')) ||
+        (identical(value, '^')) ||
+        (identical(value, '|'))) {
       return op;
-    } else if (value === '-') {
+    } else if (identical(value, '-')) {
       return isUnary ? const SourceString('unary-') : op;
     } else {
       throw 'Unhandled operator: ${op.slowToString()}';
     }
   }
 
   static SourceString mapToUserOperator(SourceString op) {
     String value = op.stringValue;
 
     if (identical(value, '!=')) return const SourceString('==');
@@ skipping 149 matching lines @@
 
   MetadataAnnotation ensureResolved(Compiler compiler) {
     if (resolutionState == STATE_NOT_STARTED) {
       compiler.resolver.resolveMetadataAnnotation(this);
     }
     return this;
   }
 
   String toString() => 'MetadataAnnotation($value, $resolutionState)';
 }