blob: 2340a41adac66f4bfcd7d2514d7fa0f946ab9a6f [file] [log] [blame]
// 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;
/// An error and a stack trace.
/// Used when an error and stack trace need to be handled as a single
/// value, for example when returned by [Zone.errorCallback].
class AsyncError implements Error {
final Object error;
final StackTrace stackTrace;
AsyncError(Object error, StackTrace? stackTrace)
: error = checkNotNullable(error, "error"),
stackTrace = stackTrace ?? defaultStackTrace(error);
/// A default stack trace for an error.
/// If [error] is an [Error] and it has an [Error.stackTrace],
/// that stack trace is returned.
/// If not, the [StackTrace.empty] default stack trace is returned.
static StackTrace defaultStackTrace(Object error) {
if (error is Error) {
var stackTrace = error.stackTrace;
if (stackTrace != null) return stackTrace;
return StackTrace.empty;
String toString() => '$error';
// Helper function used by stream method implementations.
Function errorHandler, Object error, StackTrace stackTrace) {
var handler = errorHandler; // Rename to avoid promotion.
if (handler is ZoneBinaryCallback<dynamic, Never, Never>) {
// Dynamic invocation because we don't know the actual type of the
// first argument or the error object, but we should successfully call
// the handler if they match up.
return errorHandler(error, stackTrace);
} else {
return errorHandler(error);