Make sure Future.forEach properly pipes exceptions.

tests/lib/async/futures_test.dart

Index: tests/lib/async/futures_test.dart
diff --git a/tests/lib/async/futures_test.dart b/tests/lib/async/futures_test.dart
index 4e9becfc95929d83c4519ade4242bc183571dcd6..e694134bda14a370b75e016fe85702f3524580f0 100644
--- a/tests/lib/async/futures_test.dart
+++ b/tests/lib/async/futures_test.dart
@@ -111,12 +111,13 @@ main() {
   futures.add(testWaitWithMultipleErrors());
   futures.add(testForEachEmpty());
   futures.add(testForEach());
+  futures.add(testForEachWithException());
 
   // Use a receive port for blocking the test.
   // Note that if the test fails, the program will not end.
   ReceivePort port = new ReceivePort();
   Future.wait(futures).then((List list) {
-    Expect.equals(8, list.length);
+    Expect.equals(9, list.length);
     port.close();
   });
 }