Remove AsyncError with Expando.

pkg/scheduled_test/lib/scheduled_test.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.
 
 // TODO(nweiz): Add support for calling [schedule] while the schedule is already
 // running.
 // TODO(nweiz): Port the non-Pub-specific scheduled test libraries from Pub.
 /// A package for writing readable tests of asynchronous behavior.
 ///
 /// This package works by building up a queue of asynchronous tasks called a
@@ skipping 210 matching lines @@
       if (_setUpFn != null) _setUpFn();
       body();
     }).then((_) {
       // If we got here, the test completed successfully so tell unittest so.
       asyncDone();
     }).catchError((e) {
       if (e is ScheduleError) {
         assert(e.schedule.errors.contains(e));
         assert(e.schedule == currentSchedule);
         unittest.registerException(e.schedule.errorString());
-      } else if (e is AsyncError) {
-        unittest.registerException(e.error, e.stackTrace);
       } else {
         unittest.registerException(e);
       }
     });
   });
 }
 
 /// Whether or not the tests currently being defined are in a group. This is
 /// only true when defining tests, not when executing them.
 bool _inGroup = false;
@@ skipping 101 matching lines @@
 
   return currentSchedule.wrapFuture(future, description);
 }
 
 // TODO(nweiz): re-export these once issue 9535 is fixed.
 unittest.Configuration get unittestConfiguration =>
   unittest.unittestConfiguration;
 void set unittestConfiguration(unittest.Configuration value) {
   unittest.unittestConfiguration = value;
 }