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

tests/language/first_class_types_literals_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> {}
 
 class D {}
 
 typedef int Foo(bool b);
 
 sameType(a, b) {
   Expect.identical(a.runtimeType, b.runtimeType);
 }
 
-differentType(a, b) {
-  print("a: ${a.runtimeType}");
-  print("b: ${b.runtimeType}");
-  Expect.isFalse(a.runtimeType === b.runtimeType);
-}
-
 main() {
   // Test type literals.
   Expect.identical(int, int);
-  Expect.isFalse(int === num);
+  Expect.isFalse(identical(int, num));
   Expect.identical(Foo, Foo);
 
   // Test that class literals return instances of Type.
   Expect.isTrue((D).runtimeType is Type);
 
   // Test that types from runtimeType and literals agree.
   Expect.identical(int, 1.runtimeType);
   Expect.identical(C, new C().runtimeType);
   Expect.identical(D, new D().runtimeType);
 
   // runtimeType on type is idempotent.
   Expect.identical((D).runtimeType, (D).runtimeType.runtimeType);
 
   // Test that operator calls on class literals go to Type.
   Expect.throws(() => C = 1, (e) => e is NoSuchMethodError);
   Expect.throws(() => C++, (e) => e is NoSuchMethodError);
   Expect.throws(() => C + 1, (e) => e is NoSuchMethodError);
   Expect.throws(() => C[2], (e) => e is NoSuchMethodError);
   Expect.throws(() => C[2] = 'hest', (e) => e is NoSuchMethodError);
 }