"Reverting 14829-14832"

tests/compiler/dart2js/class_codegen2_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.
 // Test that parameters keep their names in the output.
 
 import 'compiler_helper.dart';
 import 'parser_helper.dart';
 
 const String TEST_ONE = r"""
 class A { foo() => 499; }
@@ skipping 67 matching lines @@
 foo(f) { f(); }
 
 main() {
   foo(new A().foo);
 }
 """;
 
 main() {
   // At some point Dart2js generated bad object literals with dangling commas:
   // { a: true, }. Make sure this doesn't happen again.
-  RegExp danglingComma = new RegExp(r',[ \n]*}');
+  RegExp danglingComma = const RegExp(r',[ \n]*}');
   String generated = compileAll(TEST_ONE);
   Expect.isFalse(danglingComma.hasMatch(generated));
 
   generated = compileAll(TEST_TWO);
   Expect.isFalse(danglingComma.hasMatch(generated));
 
   generated = compileAll(TEST_THREE);
   Expect.isFalse(danglingComma.hasMatch(generated));
 
   generated = compileAll(TEST_FOUR);
   Expect.isFalse(danglingComma.hasMatch(generated));
 }