pkg/matcher: Reverting 36881,36896 while investigating dart2js checked crash

pkg/matcher/lib/matcher.dart

 // Copyright (c) 2014, 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.
 
-/// Support for specifying test expectations, such as for unit tests.
+/**
+ * Support for specifying test expectations, such as for unit tests.
+ *
+ * The matcher library provides a third-generation assertion mechanism, drawing
+ * inspiration from [Hamcrest](http://code.google.com/p/hamcrest/).
+ *
+ * For more information, see
+ * [Unit Testing with Dart]
+ * (http://www.dartlang.org/articles/dart-unit-tests/).
+ */
 library matcher;
 
-export 'src/core_matchers.dart';
+import 'dart:async';
+
+import 'src/description.dart';
+import 'src/interfaces.dart';
+
 export 'src/description.dart';
-export 'src/error_matchers.dart';
-export 'src/expect.dart';
-export 'src/future_matchers.dart';
 export 'src/interfaces.dart';
-export 'src/iterable_matchers.dart';
-export 'src/map_matchers.dart';
-export 'src/numeric_matchers.dart';
-export 'src/operator_matchers.dart';
-export 'src/string_matchers.dart';
+
+part 'src/core_matchers.dart';
+part 'src/expect.dart';
+part 'src/future_matchers.dart';
+part 'src/iterable_matchers.dart';
+part 'src/map_matchers.dart';
+part 'src/numeric_matchers.dart';
+part 'src/operator_matchers.dart';
+part 'src/string_matchers.dart';