Check that constant locals have constant initializers.

tests/language/constant_locals_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.
+
+// Test that constant local variables have constant initializers.
+
+import "package:expect/expect.dart";
+
+void main() {
+  const c1; /// 01: compile-time error
+  const c2 = 0;
+  const c3 = field; /// 02: compile-time error
+  const c4 = finalField; /// 03: compile-time error
+  const c5 = constField;
+  const c6 = method(); /// 04: compile-time error
+  const c7 = new Class(); /// 05: compile-time error
+  const c8 = const Class();
+}
+
+var field = 0;
+
+final finalField = 0;
+
+const constField = 0;
+
+method() => 0;
+
+class Class {
+  const Class();
+}