Migrating block 50, first commit, after tool has run

tests/language/compile_time_constant_k_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.
-
-import "package:expect/expect.dart";
-
-const x = const {
-  'a': 3, // //# 01: static type warning
-  'a': 4
-};
-const y = const { 'a': 10, 'b': 11, 'a': 12, // //# 02: static type warning
-                  'b': 13, 'a': 14 }; //        //# 02: continued
-const z = const {
-  '__proto__': 496, // //# 03: static type warning
-  '__proto__': 497, // //# 03: continued
-  '__proto__': 498, // //# 03: continued
-  '__proto__': 499
-};
-
-const x2 = const {'a': 4};
-const y2 = const {'a': 14, 'b': 13};
-const z2 = const {'__proto__': 499};
-
-main() {
-  Expect.identical(x2, x);
-  Expect.identical(y2, y); // //# 02: continued
-  Expect.identical(z2, z);
-}