pkg/test: put super call last

lib/src/runner/runner_suite.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.
 
 library test.runner.runner_suite;
 
 import 'dart:async';
 
 import 'package:async/async.dart';
 
@@ skipping 15 matching lines @@
   final Environment environment;
 
   /// The memoizer for running [close] exactly once.
   final _closeMemo = new AsyncMemoizer();
 
   /// The function to call when the suite is closed.
   final AsyncFunction _onClose;
 
   RunnerSuite(this.environment, Group group, {String path,
           TestPlatform platform, OperatingSystem os, AsyncFunction onClose})
-      : super(group, path: path, platform: platform, os: os),
-        _onClose = onClose;
+      : _onClose = onClose,
+        super(group, path: path, platform: platform, os: os);
 
   RunnerSuite filter(bool callback(Test test)) {
     var filtered = group.filter(callback);
     filtered ??= new Group.root([], metadata: metadata);
     return new RunnerSuite(environment, filtered,
       platform: platform, os: os, path: path);
   }
 
   /// Closes the suite and releases any resources associated with it.
   Future close() {
     return _closeMemo.runOnce(() async {
       if (_onClose != null) await _onClose();
     });
   }
 }