Big merge from experimental to bleeding edge.

tests/standalone/io/fuzz_support.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 fuzz_support;
 
-import "dart:io";
+import 'dart:async';
+import 'dart:io';
 
 const typeMapping = const {
   'null': null,
   'int': 0,
   'bigint': 18446744073709551617,
   'String': 'a',
   'FileMode': FileMode.READ,
   'num': 0.50,
   'List<int>': const [1, 2, 3],
   'Map<String, int>': const { "a": 23 }
@@ skipping 21 matching lines @@
 }
 
 // Perform sync operation and ignore all exceptions.
 doItSync(Function f) {
   try { f(); } catch (e) {}
 }
 
 // Perform async operation and transform the future for the operation
 // into a future that never fails by treating errors as normal
 // completion.
-Future doItAsync(Function f) {
+Future doItAsync(void f()) {
   // Ignore value and errors.
-  var completer = new Completer();
-  var future = f();
-  future.handleException((e) {
-    completer.complete(true);
-    return true;
-  });
-  future.then((v) => completer.complete(true));
-  return completer.future;
+  return new Future.delayed(0, f).catchError((_) {}).then((_) => true);
 }