Suspend after async generator terminates

tests/language/async_throw_in_catch_test.dart

 // Copyright (c) 2015, 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.
 
 import "dart:async";
 import "package:expect/expect.dart";
 import "package:async_helper/async_helper.dart";
 
 class Tracer {
   final String expected;
@@ skipping 421 matching lines @@
     } finally {
       await new Future.value(3);  /// forceAwait: continued
       tracer.trace("c");
     }
     tracer.trace("d");
   }
   tracer.trace("e");
 }
 
 runTest(expectedTrace, fun, [expectedError]) async {
-  Tracer tracer = new Tracer(expectedTrace);
+  Tracer tracer = new Tracer(expectedTrace, expectedTrace);
   try {
     await fun(tracer);
   } catch (error) {
     Expect.equals(expectedError, error);
     tracer.trace("X");
   }
   tracer.done();
 }
 
 test() async {
@@ skipping 14 matching lines @@
   await runTest("abcdefgX", foo14, "Error3");
   await runTest("abcdefg", foo15);
   await runTest("abcdfg", foo16);
   await runTest("abcdef", foo17);
   await runTest("abcde", foo18);
 }
 
 void main() {
   asyncTest(test);
 }