Migrate language block 46 - canonical_const ... char_escape.

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