Revert "Revert "Use native async/await support in pub.""

sdk/lib/_internal/pub_generated/asset/dart/serialize/exception.dart

-// Copyright (c) 2014, 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 pub.asset.serialize.exception;
-
-import 'package:barback/barback.dart';
-import 'package:stack_trace/stack_trace.dart';
-
-import '../utils.dart';
-
-/// An exception that was originally raised in another isolate.
-///
-/// Exception objects can't cross isolate boundaries in general, so this class
-/// wraps as much information as can be consistently serialized.
-class CrossIsolateException implements Exception {
-  /// The name of the type of exception thrown.
-  ///
-  /// This is the return value of [error.runtimeType.toString()]. Keep in mind
-  /// that objects in different libraries may have the same type name.
-  final String type;
-
-  /// The exception's message, or its [toString] if it didn't expose a `message`
-  /// property.
-  final String message;
-
-  /// The exception's stack chain, or `null` if no stack chain was available.
-  final Chain stackTrace;
-
-  /// Loads a [CrossIsolateException] from a serialized representation.
-  ///
-  /// [error] should be the result of [CrossIsolateException.serialize].
-  CrossIsolateException.deserialize(Map error)
-      : type = error['type'],
-        message = error['message'],
-        stackTrace = error['stack'] == null ? null :
-            new Chain.parse(error['stack']);
-
-  /// Serializes [error] to an object that can safely be passed across isolate
-  /// boundaries.
-  static Map serialize(error, [StackTrace stack]) {
-    if (stack == null && error is Error) stack = error.stackTrace;
-    return {
-      'type': error.runtimeType.toString(),
-      'message': getErrorMessage(error),
-      'stack': stack == null ? null : new Chain.forTrace(stack).toString()
-    };
-  }
-
-  String toString() => "$message\n$stackTrace";
-}
-
-/// An [AssetNotFoundException] that was originally raised in another isolate. 
-class _CrossIsolateAssetNotFoundException extends CrossIsolateException
-    implements AssetNotFoundException {
-  final AssetId id;
-
-  String get message => "Could not find asset $id.";
-
-  /// Loads a [_CrossIsolateAssetNotFoundException] from a serialized
-  /// representation.
-  ///
-  /// [error] should be the result of
-  /// [_CrossIsolateAssetNotFoundException.serialize].
-  _CrossIsolateAssetNotFoundException.deserialize(Map error)
-      : id = new AssetId(error['package'], error['path']),
-        super.deserialize(error);
-
-  /// Serializes [error] to an object that can safely be passed across isolate
-  /// boundaries.
-  static Map serialize(AssetNotFoundException error, [StackTrace stack]) {
-    var map = CrossIsolateException.serialize(error);
-    map['package'] = error.id.package;
-    map['path'] = error.id.path;
-    return map;
-  }
-}
-
-/// Serializes [error] to an object that can safely be passed across isolate
-/// boundaries.
-///
-/// This handles [AssetNotFoundException]s specially, ensuring that their
-/// metadata is preserved.
-Map serializeException(error, [StackTrace stack]) {
-  if (error is AssetNotFoundException) {
-    return _CrossIsolateAssetNotFoundException.serialize(error, stack);
-  } else {
-    return CrossIsolateException.serialize(error, stack);
-  }
-}
-
-/// Loads an exception from a serialized representation.
-///
-/// This handles [AssetNotFoundException]s specially, ensuring that their
-/// metadata is preserved.
-CrossIsolateException deserializeException(Map error) {
-  if (error['type'] == 'AssetNotFoundException') {
-    return new _CrossIsolateAssetNotFoundException.deserialize(error);
-  } else {
-    return new CrossIsolateException.deserialize(error);
-  }
-}