Roll to pickup pool changes

packages/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 'package:stack_trace/stack_trace.dart';
 
 import 'asset/asset_id.dart';
 import 'transformer/wrapping_aggregate_transformer.dart';
@@ skipping 42 matching lines @@
   final Set<BarbackException> errors;
 
   AggregateException(Iterable<BarbackException> errors)
       : errors = flattenAggregateExceptions(errors).toSet();
 
   String toString() {
     var buffer = new StringBuffer();
     buffer.writeln("Multiple errors occurred:\n");
 
     for (var error in errors) {
-      buffer.writeln(prefixLines(error.toString(),
-                                 prefix: "  ", firstPrefix: "- "));
+      buffer.writeln(
+          prefixLines(error.toString(), prefix: "  ", firstPrefix: "- "));
     }
 
     return buffer.toString();
   }
 }
 
 /// Error thrown when two or more transformers both output an asset with [id].
 class AssetCollisionException implements BarbackException {
   /// All the transforms that output an asset with [id].
   ///
@@ skipping 96 matching lines @@
   /// The transformer that's run for this transform.
   ///
   /// This may be a [Transformer] or a [WrappingAggregateTransformer]. It may
   /// also return additional types in the future.
   final transformer;
 
   /// The id of this transform's primary asset.
   final AssetId primaryId;
 
   TransformInfo(transformer, this.primaryId)
-      : transformer = transformer is WrappingAggregateTransformer ?
-            transformer.transformer : transformer;
+      : transformer = transformer is WrappingAggregateTransformer
+            ? transformer.transformer
+            : transformer;
 
-  bool operator==(other) =>
+  bool operator ==(other) =>
       other is TransformInfo &&
       other.transformer == transformer &&
       other.primaryId == primaryId;
 
   int get hashCode => transformer.hashCode ^ primaryId.hashCode;
 
   String toString() => "$transformer on $primaryId";
 }