Allow asynchronous tests to explicitly register exceptions along with stack traces.

utils/tests/pub/test_pub.dart

 // Copyright (c) 2012, 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.
 
 /**
  * Test infrastructure for testing pub. Unlike typical unit tests, most pub
  * tests are integration tests that stage some stuff on the file system, run
  * pub, and then validate the results. This library provides an API to build
  * tests like that.
  */
@@ skipping 165 matching lines @@
   final future = _setUpSandbox().chain((sandboxDir) {
     createdSandboxDir = sandboxDir;
     return _runScheduled(sandboxDir, _scheduled);
   });
 
   future.handleException((error) {
     // If an error occurs during testing, delete the sandbox, throw the error so
     // that the test framework sees it, then finally call asyncDone so that the
     // test framework knows we're done doing asynchronous stuff.
     cleanup().then((_) {
-      guardAsync(() { throw error; }, asyncDone);
+      registerException(error, future.stackTrace);
+      asyncDone();
     });
     return true;
   });
 
   future.chain((_) => cleanup()).then((_) => asyncDone());
 }
 
 /**
  * Schedules a call to the Pub command-line utility. Runs Pub with [args] and
  * validates that its results match [output], [error], and [exitCode].
@@ skipping 520 matching lines @@
 }
 
 /**
  * Schedules a callback to be called after Pub is run with [runPub], even if it
  * fails.
  */
 void _scheduleCleanup(_ScheduledEvent event) {
   if (_scheduledCleanup == null) _scheduledCleanup = [];
   _scheduledCleanup.add(event);
 }