unfork DDC's copy of most SDK libraries

pkg/dev_compiler/tool/input_sdk/lib/async/async_error.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.
-
-part of dart.async;
-
-_invokeErrorHandler(Function errorHandler,
-                    Object error, StackTrace stackTrace) {
-  if (errorHandler is ZoneBinaryCallback) {
-    return errorHandler(error, stackTrace);
-  } else {
-    ZoneUnaryCallback unaryErrorHandler = errorHandler;
-    return unaryErrorHandler(error);
-  }
-}
-
-Function _registerErrorHandler/*<R>*/(Function errorHandler, Zone zone) {
-  if (errorHandler is ZoneBinaryCallback) {
-    // TODO(leafp): These are commented out, because the async libraries
-    // pass a (...) -> void into this function which fails whenever R
-    // is something interesting.  This needs to be sorted out in the main
-    // SDK as to what the intent is here: if this is really supposed to
-    // return an R, then the function that gets passed in is wrong.  If not,
-    // then this code doesn't need to track the return type at all.
-    //    return zone.registerBinaryCallback/*<R, dynamic, StackTrace>*/(
-    //        errorHandler as dynamic/*=ZoneBinaryCallback<R, dynamic, StackTrace>*/);
-    return zone.registerBinaryCallback/*<dynamic, dynamic, StackTrace>*/(
-        errorHandler as dynamic/*=ZoneBinaryCallback<dynamic, dynamic, StackTrace>*/);
-  } else {
-    //    return zone.registerUnaryCallback/*<R, dynamic>*/(
-    //        errorHandler as dynamic/*=ZoneUnaryCallback<R, dynamic>*/);
-    return zone.registerUnaryCallback/*<dynamic, dynamic>*/(
-        errorHandler as dynamic/*=ZoneUnaryCallback<dynamic, dynamic>*/);
-  }
-}
-
-class _UncaughtAsyncError extends AsyncError {
-  _UncaughtAsyncError(error, StackTrace stackTrace)
-      : super(error, _getBestStackTrace(error, stackTrace));
-
-  static StackTrace _getBestStackTrace(error, StackTrace stackTrace) {
-    if (stackTrace != null) return stackTrace;
-    if (error is Error) {
-      return error.stackTrace;
-    }
-    return null;
-  }
-
-  String toString() {
-    String result = "Uncaught Error: ${error}";
-
-    if (stackTrace != null) {
-      result += "\nStack Trace:\n$stackTrace";
-    }
-    return result;
-  }
-}