a === b -> identical(a, b)

tests/language/canonical_const_test.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.
 // Check that initializers of static const fields are compile time constants.
 
 class CanonicalConstTest {
   static const A = const C1();
   static const B = const C2();
 
   static testMain() {
-    Expect.isTrue(null===null);
-    Expect.isTrue(null!==0);
-    Expect.isTrue(1===1);
-    Expect.isTrue(1!==2);
-    Expect.isTrue(true===true);
-    Expect.isTrue("so"==="so");
-    Expect.isTrue(const Object()===const Object());
-    Expect.isTrue(const Object()!==const C1());
-    Expect.isTrue(const C1()===const C1());
-    Expect.isTrue(A===const C1());
-    Expect.isTrue(const C1()!==const C2());
-    Expect.isTrue(B===const C2());
+    Expect.isTrue(identical(null, null));

[Lasse Reichstein Nielsen, 2012/11/12 13:10:41]

Use
 Expect.identical
and 
 Expect.isFalse(identical

[floitsch, 2012/11/12 22:18:43]

Done.

+    Expect.isTrue(!identical(null, 0));
+    Expect.isTrue(identical(1, 1));
+    Expect.isTrue(!identical(1, 2));
+    Expect.isTrue(identical(true, true));
+    Expect.isTrue(identical("so", "so"));
+    Expect.isTrue(identical(const Object(), const Object()));
+    Expect.isTrue(!identical(const Object(), const C1()));
+    Expect.isTrue(identical(const C1(), const C1()));
+    Expect.isTrue(identical(A, const C1()));
+    Expect.isTrue(!identical(const C1(), const C2()));
+    Expect.isTrue(identical(B, const C2()));
     // TODO(johnlenz): these two values don't currently have the same type
     // Expect.isTrue(const [1,2] === const List[1,2]);
-    Expect.isTrue(const [2,1] !== const[1,2]);
-    Expect.isTrue(const <int>[1,2] === const <int>[1,2]);
-    Expect.isTrue(const <Object>[1,2] === const <Object>[1,2]);
-    Expect.isTrue(const <int>[1,2] !== const <double>[1.0,2.0]);
-    Expect.isTrue(const {"a":1, "b":2} === const {"a":1, "b":2});
-    Expect.isTrue(const {"a":1, "b":2} !== const {"a":2, "b":2});
+    Expect.isTrue(!identical(const [2,1], const[1,2]));
+    Expect.isTrue(identical(const <int>[1,2], const <int>[1,2]));
+    Expect.isTrue(identical(const <Object>[1,2], const <Object>[1,2]));
+    Expect.isTrue(!identical(const <int>[1,2], const <double>[1.0,2.0]));
+    Expect.isTrue(identical(const {"a":1, "b":2}, const {"a":1, "b":2}));
+    Expect.isTrue(!identical(const {"a":1, "b":2}, const {"a":2, "b":2}));
   }
 }
 
 class C1 {
   const C1();
 }
 
 class C2 extends C1 {
   const C2() : super();
 }
 
 main() {
   CanonicalConstTest.testMain();
 }