Big merge from experimental to bleeding edge.

tests/compiler/dart2js/type_guard_unuser_test.dart

 // 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.
 
 import 'compiler_helper.dart';
 
 const String TEST_ONE = r"""
 foo(a) {
   int b = foo(true);
   if (a) b = foo(2);
@@ skipping 24 matching lines @@
   for (int i = 0; i < 1; i++) {
     t = 0 + a + b;
   }
   return t;
 }
 """;
 
 main() {
   String generated = compile(TEST_ONE, entry: 'foo');
   RegExp regexp = new RegExp(getIntTypeCheck(anyIdentifier));
-  Iterator<Match> matches = regexp.allMatches(generated).iterator();
+  Iterator<Match> matches = regexp.allMatches(generated).iterator;
   checkNumberOfMatches(matches, 0);
   Expect.isTrue(generated.contains(r'return a === true ? $.foo(2) : b;'));
 
   generated = compile(TEST_TWO, entry: 'foo');
   regexp = new RegExp("foo\\(1\\)");
-  matches = regexp.allMatches(generated).iterator();
+  matches = regexp.allMatches(generated).iterator;
   checkNumberOfMatches(matches, 1);
 
   generated = compile(TEST_THREE, entry: 'foo');
   regexp = new RegExp(getNumberTypeCheck('a'));
   Expect.isTrue(regexp.hasMatch(generated));
   regexp = new RegExp(getNumberTypeCheck('b'));
   Expect.isTrue(regexp.hasMatch(generated));
 
   generated = compile(TEST_THREE_WITH_BAILOUT, entry: 'foo');
   regexp = new RegExp(getNumberTypeCheck('a'));
   Expect.isTrue(regexp.hasMatch(generated));
   regexp = new RegExp(getNumberTypeCheck('b'));
   Expect.isTrue(regexp.hasMatch(generated));
 }