Fix some bugs with the previous CL.

lib/src/runner.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 'dart:io';
 
 import 'package:async/async.dart';
 
 import 'backend/group.dart';
@@ skipping 112 matching lines @@
       success = results.last;
     }
 
     if (_closed) return false;
 
     if (_engine.passed.length == 0 && _engine.failed.length == 0 &&
         _engine.skipped.length == 0 && _config.patterns.isNotEmpty) {
       var patterns = toSentence(_config.patterns.map(
           (pattern) => pattern is RegExp
               ? 'regular expression "${pattern.pattern}"'
-              : '"$pattern"'))
+              : '"$pattern"'));
 
       throw new ApplicationException('No tests match $patterns.');
     }
 
     // Explicitly check "== true" here because [Engine.run] can return `null`
     // if the engine was closed prematurely.
     return success == true;
   }
 
   /// Emits a warning if the user is trying to run on a platform that's
@@ skipping 206 matching lines @@
       await _debugOperation.valueOrCancellation();
     }).listen(null);
 
     var results = await Future.wait([
       _suiteSubscription.asFuture().then((_) => _engine.suiteSink.close()),
       _engine.run()
     ]);
     return results.last;
   }
 }