- Allow string interpolation in constant strings.

tests/language/src/StringInterpolation7NegativeTest.dart

Index: tests/language/src/StringInterpolation7NegativeTest.dart
===================================================================
--- tests/language/src/StringInterpolation7NegativeTest.dart	(revision 5372)
+++ tests/language/src/StringInterpolation7NegativeTest.dart	(working copy)
@@ -1,14 +0,0 @@
-// 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.
-//
-// Disallow assignment of string interpolation to a static final field
-
-class A {
-  static final x = 1;
-  static final y = "Two is greater than ${x}";  // ERROR: String interpolation
-}
-
-main() {
-  var a = A.y;
-}