pkg/matcher: refactored code around data-structure vs execution-based matchers

pkg/matcher/lib/src/iterable_matchers.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.
 
 library matcher.iterable_matchers;
 
 import 'core_matchers.dart';
 import 'description.dart';
-import 'expect.dart';
 import 'interfaces.dart';
+import 'util.dart';
 
 /// Returns a matcher which matches [Iterable]s in which all elements
 /// match the given [matcher].
 Matcher everyElement(matcher) => new _EveryElement(wrapMatcher(matcher));
 
 class _EveryElement extends _IterableMatcher {
   final Matcher _matcher;
 
   _EveryElement(Matcher this._matcher);
 
@@ skipping 235 matching lines @@
     } else {
       return mismatchDescription.
           add('has ').
           addDescriptionOf(matchState["actual"]).
           add(' which is not $_description ').
           addDescriptionOf(matchState["expected"]).
           add(' at index ${matchState["index"]}');
     }
   }
 }