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

tests/language/first_class_types_test.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.
 
 class C<T> {}
 
 sameType(a, b) {
-  Expect.identical(a.runtimeType, b.runtimeType);
+  Expect.equals(a.runtimeType, b.runtimeType);
 }
 
 differentType(a, b) {
-  print("a: ${a.runtimeType}");
-  print("b: ${b.runtimeType}");
-  Expect.isFalse(a.runtimeType === b.runtimeType);
+  Expect.isFalse(a.runtimeType == b.runtimeType);
 }
 
 main() {
   // Test types obtained by calling runtimeType.
   var v1 = new C<int>();
   var v2 = new C<int>();
   sameType(v1, v2);
 
   var v3 = new C<num>();
   differentType(v1, v3);
 
   var i = 1;
   var s = 'string';
   var d = 3.14;
   sameType(2, i);
   sameType('hest', s);
   sameType(1.2, d);
 
   var l = [1, 2, 3];
   var m = {'a': 1, 'b': 2};
   sameType([], l);
   sameType({}, m);
 }