Add missing newline after Actual value in fail message.

pkg/unittest/lib/src/operator_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.
 
 part of matcher;
 
 /**
  * This returns a matcher that inverts [matcher] to its logical negation.
  */
 Matcher isNot(matcher) => new _IsNot(wrapMatcher(matcher));
 
-class _IsNot extends BaseMatcher {
+class _IsNot extends Matcher {
   final Matcher _matcher;
 
   const _IsNot(Matcher this._matcher);
 
   bool matches(item, Map matchState) =>
       !_matcher.matches(item, matchState);
 
   Description describe(Description description) =>
     description.add('not ').addDescriptionOf(_matcher);
 }
@@ skipping 43 matching lines @@
     if (arg5 != null) {
       matchers.add(wrapMatcher(arg5));
     }
     if (arg6 != null) {
       matchers.add(wrapMatcher(arg6));
     }
     return new _AllOf(matchers);
   }
 }
 
-class _AllOf extends BaseMatcher {
+class _AllOf extends Matcher {
   final Iterable<Matcher> _matchers;
 
   const _AllOf(this._matchers);
 
   bool matches(item, Map matchState) {
      for (var matcher in _matchers) {
        if (!matcher.matches(item, matchState)) {
         addStateInfo(matchState, {'matcher': matcher});
          return false;
        }
@@ skipping 63 matching lines @@
     if (arg5 != null) {
       matchers.add(wrapMatcher(arg5));
     }
     if (arg6 != null) {
       matchers.add(wrapMatcher(arg6));
     }
     return new _AnyOf(matchers);
   }
 }
 
-class _AnyOf extends BaseMatcher {
+class _AnyOf extends Matcher {
   final Iterable<Matcher> _matchers;
 
   const _AnyOf(this._matchers);
 
   bool matches(item, Map matchState) {
      for (var matcher in _matchers) {
        if (matcher.matches(item, matchState)) {
          return true;
        }
      }
      return false;
   }
 
   Description describe(Description description) =>
     description.addAll('(', ' or ', ')', _matchers);
 }