Remove deprecated parts of dart:async.

pkg/barback/lib/src/errors.dart

 // Copyright (c) 2013, 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 barback.errors;
 
 import 'dart:async';
 
 import 'package:stack_trace/stack_trace.dart';
 
@@ skipping 97 matching lines @@
   InvalidOutputException(this.transform, this.id);
 
   String toString() => "Transform $transform emitted $id, which wasn't in the "
       "same package (${transform.primaryId.package}).";
 }
 
 /// Base class for an error that wraps another.
 abstract class _WrappedException implements BarbackException {
   /// The wrapped exception.
   final error;
+  final StackTrace stackTrace;
 
-  _WrappedException(this.error);
+  _WrappedException(this.error, this.stackTrace);
 
   String get _message;
 
   String toString() {
     var result = "$_message: $error";
 
-    var stack = getAttachedStackTrace(error);
+    var stack = stackTrace;
+    if (stack == null && error is Error) stack = error.stackTrace;
     if (stack != null) {
       result = "$result\n${new Trace.from(stack).terse}";
     }
 
     return result;
   }
 }
 
 /// Error wrapping an exception thrown by a transform.
 class TransformerException extends _WrappedException {
   /// The transform that threw the exception.
   final TransformInfo transform;
 
-  TransformerException(this.transform, error)
-      : super(error);
+  TransformerException(this.transform, error, StackTrace stackTrace)
+      : super(error, stackTrace);
 
   String get _message => "Transform $transform threw error";
 }
 
 /// Error thrown when a source asset [id] fails to load.
 ///
 /// This can be thrown either because the source asset was expected to exist and
 /// did not or because reading it failed somehow.
 class AssetLoadException extends _WrappedException {
   final AssetId id;
 
-  AssetLoadException(this.id, error)
-      : super(error);
+  AssetLoadException(this.id, error, [StackTrace stackTrace])
+      : super(error, stackTrace);
 
   String get _message => "Failed to load source asset $id";
 }
 
 /// Information about a single transform in the barback graph.
 ///
 /// Identifies a single transformation in the barback graph.
 ///
 /// A transformation is uniquely identified by the ID of its primary input, and
 /// the transformer that is applied to it.
 class TransformInfo {
   /// The transformer that's run for this transform.
   final Transformer transformer;
 
   /// The id of this transform's primary asset.
   final AssetId primaryId;
 
   TransformInfo(this.transformer, this.primaryId);
 
   bool operator==(other) =>
       other is TransformInfo &&
       other.transformer == transformer &&
       other.primaryId == primaryId;
 
   int get hashCode => transformer.hashCode ^ primaryId.hashCode;
 
   String toString() => "$transformer on $primaryId";
 }