Expose Zones.

sdk/lib/async/future.dart

Index: sdk/lib/async/future.dart
diff --git a/sdk/lib/async/future.dart b/sdk/lib/async/future.dart
index ab4b666965b2ebfedef5d92fdf948310fe408cb8..ac2b570692fecabb67fe777cb73edb7d3c52b815 100644
--- a/sdk/lib/async/future.dart
+++ b/sdk/lib/async/future.dart
@@ -194,12 +194,15 @@ abstract class Future<T> {
     // List collecting values from the futures.
     // Set to null if an error occurs.
     List values;
-    void handleError(error) {
+
+    handleError(error) {

[Lasse Reichstein Nielsen, 2013/09/23 14:24:12]

Without the "void" this looks too much like a function call.
How about having "dynamic" as return type (because neither void nor Null seems
to typecheck. At least Null probably should).

[floitsch, 2013/09/23 17:12:07]

It sticks nicely out in the editor. So syntax highlighting makes a huge
difference.
"void" would actually work again (I had the FutureImpl temporarily changed but
needed to revert the change because too many users were depending on it).
Added "dynamic", but if you prefer I could go back to "void".

       if (values != null) {
         values = null;
         completer.completeError(error);
       }
+      return null;
     }
+
     // As each future completes, put its value into the corresponding
     // position in the list of values.
     int remaining = 0;