Make RegExp's constructor non-const.

utils/tests/pub/update/pub_update_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.
 
 library pub_tests;
 
 import 'dart:io';
 
 import '../test_pub.dart';
 import '../../../../pkg/unittest/lib/unittest.dart';
 
 main() {
   group('requires', () {
     test('a pubspec', () {
       dir(appPath, []).scheduleCreate();
 
       schedulePub(args: ['update'],
-          error: const RegExp(r'^Could not find a file named "pubspec.yaml"'),
+          error: new RegExp(r'^Could not find a file named "pubspec.yaml"'),
           exitCode: 1);
 
       run();
     });
 
     test('a pubspec with a "name" key', () {
       dir(appPath, [
         pubspec({"dependencies": {"foo": null}})
       ]).scheduleCreate();
 
       schedulePub(args: ['update'],
-          error: const RegExp(r'^pubspec.yaml is missing the required "name" '
+          error: new RegExp(r'^pubspec.yaml is missing the required "name" '
               r'field \(e\.g\. "name: myapp"\)\.'),
           exitCode: 1);
 
       run();
     });
   });
 
   test('adds itself to the packages', () {
     // The symlink should use the name in the pubspec, not the name of the
     // directory.
     dir(appPath, [
       pubspec({"name": "myapp_name"}),
       libDir('myapp_name')
     ]).scheduleCreate();
 
     schedulePub(args: ['update'],
-        output: const RegExp(r"Dependencies updated!$"));
+        output: new RegExp(r"Dependencies updated!$"));
 
     dir(packagesPath, [
       dir("myapp_name", [
         file('myapp_name.dart', 'main() => "myapp_name";')
       ])
     ]).scheduleValidate();
 
     run();
   });
 
   test('does not adds itself to the packages if it has no "lib" directory', () {
     // The symlink should use the name in the pubspec, not the name of the
     // directory.
     dir(appPath, [
       pubspec({"name": "myapp_name"}),
     ]).scheduleCreate();
 
     schedulePub(args: ['update'],
-        output: const RegExp(r"Dependencies updated!$"));
+        output: new RegExp(r"Dependencies updated!$"));
 
     dir(packagesPath, [
       nothing("myapp_name")
     ]).scheduleValidate();
 
     run();
   });
 
   test('does not add a package if it does not have a "lib" directory', () {
     // Using an SDK source, but this should be true of all sources.
     dir(sdkPath, [
       file('revision', '1234'),
       dir('pkg', [
         dir('foo', [
           libPubspec('foo', '0.0.0-not.used')
         ])
       ])
     ]).scheduleCreate();
 
     dir(appPath, [
       pubspec({"name": "myapp", "dependencies": {"foo": {"sdk": "foo"}}})
     ]).scheduleCreate();
 
     schedulePub(args: ['update'],
-        output: const RegExp(r"Dependencies updated!$"));
+        output: new RegExp(r"Dependencies updated!$"));
 
     packagesDir({"foo": null}).scheduleValidate();
 
     run();
   });
 }