Roll sdk dependency to 34357cdad108dcba734949bd13bd28c76ea285e0

lib/async/async_patch.dart

Index: lib/async/async_patch.dart
diff --git a/lib/async/async_patch.dart b/lib/async/async_patch.dart
index 5ecbaff8c5138996acc042f57124189ca7b37fd6..f3bc3c91f2b43c8cd1a65d426165bdb9d5d1c0f9 100644
--- a/lib/async/async_patch.dart
+++ b/lib/async/async_patch.dart
@@ -3,12 +3,11 @@
 // BSD-style license that can be found in the LICENSE.md file.
 
 import 'dart:fletch._system' as fletch;
+import 'dart:fletch._system' show patch;
 import 'dart:fletch';
 import 'dart:fletch.os' as os;
 import 'dart:math';
 
-const patch = "patch";
-
 Channel _eventQueue;
 int _numberOfEvents = 0;
 
@@ -115,3 +114,7 @@ class _FletchTimer implements Timer {
                                      milliseconds);
   }
 }
+
+@patch void _rethrow(Object error, StackTrace stackTrace) {
+  throw new AsyncError(error, stackTrace);
+}