Adapt streams for additional stackTrace argument.

pkg/watcher/lib/src/directory_watcher.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 watcher.directory_watcher;
 
 import 'dart:async';
 import 'dart:io';
 
 import 'package:crypto/crypto.dart';
@@ skipping 115 matching lines @@
       // Null tells the queue consumer that we're done listing.
       _filesToProcess.add(null);
     }
 
     var stream = new Directory(directory).list(recursive: true);
     _listSubscription = stream.listen((entity) {
       assert(_state != _WatchState.UNSUBSCRIBED);
 
       if (entity is! File) return;
       _filesToProcess.add(entity.path);
-    }, onError: (error) {
+    }, onError: (error, [StackTrace stackTrace]) {

[Lasse Reichstein Nielsen, 2013/10/04 08:45:17]

Not optional. Stream is from io-lib.

[floitsch, 2013/10/05 18:11:48]

Done.

       if (!isDirectoryNotFoundException(error)) {
         // It's some unknown error. Pipe it over to the event stream so the
         // user can see it.
-        _events.addError(error);
+        _events.addError(error, stackTrace);
       }
 
       // When an error occurs, we end the listing normally, which has the
       // desired effect of marking all files that were in the directory as
       // being removed.
       endListing();
     }, onDone: endListing, cancelOnError: true);
   }
 
   /// Processes [file] to determine if it has been modified since the last
@@ skipping 121 matching lines @@
 
 class _FileStatus {
   /// The last time the file was modified.
   DateTime modified;
 
   /// The SHA-1 hash of the contents of the file.
   List<int> hash;
 
   _FileStatus(this.modified, this.hash);
 }