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<dynamic, Null, Null>) {
    return (errorHandler as dynamic)(error, stackTrace);
  } else {
    ZoneUnaryCallback unaryErrorHandler = errorHandler;
    return unaryErrorHandler(error);
  }
}

Function _registerErrorHandler<R>(Function errorHandler, Zone zone) {
  if (errorHandler is ZoneBinaryCallback<dynamic, Null, Null>) {
    return zone
        .registerBinaryCallback<FutureOr<R>, Object, StackTrace>(errorHandler);
  } else {
    return zone.registerUnaryCallback<FutureOr<R>, Object>(errorHandler);
  }
}