When canonicalize instances check if all fields are canonical. If a field is a non-canonical number…

tests/language/canonical_const3_test.dart

+// Copyright (c) 2013, 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 proper canonicalization (fields must be canonicalized as well).
+
+import "package:expect/expect.dart";
+
+
+main() {
+  Expect.isFalse(identical(new Duration(days: 1), new Duration(days: 1)));
+  Expect.isTrue(identical(const Duration(days: 2), const Duration(days: 2)));
+  Expect.isTrue(identical(const B(3.0), const B(3.0)));
+  Expect.isTrue(identical(const F(main), const F(main)));
+}
+
+
+class A {
+  final a;
+  const A(v) : a = v + 3.4;
+}
+
+class B extends A {
+  final b;
+  const B(v) : super(v), b = v + 1.0;
+}
+
+class F {
+  final f;
+  const F(v) : f = v;
+}