Remove AsyncError with Expando.

tools/testing/dart/test_runner.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.
 
 /**
  * Classes and methods for executing tests.
  *
  * This module includes:
  * - Managing parallel execution of tests, including timeout checks.
  * - Evaluating the output of each test as pass/fail/crash/timeout.
@@ skipping 966 matching lines @@
             if (process != null) {
               process.kill();
             }
           }
           process.exitCode.then(_commandComplete);
           _drainStream(process.stdout, stdout);
           _drainStream(process.stderr, stderr);
           timeoutTimer = new Timer(new Duration(seconds: testCase.timeout),
                                    timeoutHandler);
         }).catchError((e) {
+          // TODO(floitsch): should we try to report the stacktrace?
           print("Process error:");
           print("  Command: $command");
           print("  Error: $e");
           _commandComplete(-1);
           return true;
         });
       }
     });
   }
 
@@ skipping 239 matching lines @@
       });
 
       _process.stdin.done.catchError((err) {
         print('Error on batch runner input stream stdin');
         print('  Previous test\'s status: $_status');
         print('  Error: $err');
         throw err;
       });
       callback();
     }).catchError((e) {
+      // TODO(floitsch): should we try to report the stacktrace?
       print("Process error:");
       print("  Command: $_executable ${_batchArguments.join(' ')}");
       print("  Error: $e");
       // If there is an error starting a batch process, chances are that
       // it will always fail. So rather than re-trying a 1000+ times, we
       // exit.
       io.exit(1);
       return true;
     });
   }
@@ skipping 151 matching lines @@
           var regexp = new RegExp(r".*selenium-server-standalone.*");
           if (regexp.hasMatch(line)) {
             _seleniumAlreadyRunning = true;
             resumeTesting();
           }
           if (!_isSeleniumAvailable) {
             _startSeleniumServer();
           }
         });
       }).catchError((e) {
+      // TODO(floitsch): should we try to report the stacktrace?
         print("Error starting process:");
         print("  Command: $cmd ${arg.join(' ')}");
         print("  Error: $e");
         // TODO(ahe): How to report this as a test failure?
         io.exit(1);
         return true;
       });
     }
   }
 
@@ skipping 45 matching lines @@
             // server is ready).
             Stream<String> stdoutStringStream =
                 _seleniumServer.stdout.transform(new io.StringDecoder())
                 .transform(new io.LineTransformer());
             Stream<String> stderrStringStream =
                 _seleniumServer.stderr.transform(new io.StringDecoder())
                 .transform(new io.LineTransformer());
             stdoutStringStream.listen(seleniumServerHandler);
             stderrStringStream.listen(seleniumServerHandler);
           }).catchError((e) {
+            // TODO(floitsch): should we try to report the stacktrace?
             print("Process error:");
             print("  Command: java -jar $file");
             print("  Error: $e");
             // TODO(ahe): How to report this as a test failure?
             io.exit(1);
             return true;
           });
         }
       }
     });
@@ skipping 241 matching lines @@
     }
   }
 
   void eventAllTestsDone() {
     for (var listener in _eventListener) {
       listener.allDone();
     }
   }
 }