Version 0.8.10.4

dart/sdk/lib/_internal/lib/async_patch.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.
 
 // Patch file for the dart:async library.
 
 import 'dart:_js_helper' show Primitives;
 import 'dart:_isolate_helper' show IsolateNatives, TimerImpl;
 import 'dart:_foreign_helper' show JS, DART_CLOSURE_TO_JS;
 
@@ skipping 17 matching lines @@
   }
 }
 
 patch class DeferredLibrary {
   patch Future<bool> load() {
     return _load(libraryName, uri);
   }
 }
 
 // TODO(ahe): This should not only apply to this isolate.
-final _loadedLibraries = <String, Completer<bool>>{};
+final Map<String, Future<bool>> _loadedLibraries = <String, Future<bool>>{};
 
 Future<bool> _load(String libraryName, String uri) {
   // TODO(ahe): Validate libraryName.  Kasper points out that you want
   // to be able to experiment with the effect of toggling @DeferLoad,
   // so perhaps we should silently ignore "bad" library names.
   Future<bool> future = _loadedLibraries[libraryName];
   if (future != null) {
     return future.then((_) => false);
   }
 
@@ skipping 44 matching lines @@
   });
 }
 
 /// Used to implement deferred loading. Used as callback on "load"
 /// event above in [load].
 _onDeferredLibraryLoad(Completer<bool> completer, event) {
   completer.complete(true);
 }
 
 bool get _hasDocument => JS('String', 'typeof document') == 'object';