Migrating block 50, first commit, after tool has run

tests/language/compile_time_constant_checked_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.
-
-final int x = 'foo'; //# 01: static type warning, dynamic type error
-const int y = 'foo'; //# 02: static type warning, checked mode compile-time error
-int z = 'foo'; //# 03: static type warning, dynamic type error
-
-main() {
-  print(x); //# 01: continued
-  print(y); //# 02: continued
-  print(z); //# 03: continued
-}