Temporarily reintroduce IndexOutOfRangeError matcher in unittests.

pkg/unittest/lib/src/core_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;
 
 /**
  * Returns a matcher that matches empty strings, maps or collections.
  */
 const Matcher isEmpty = const _Empty();
@@ skipping 447 matching lines @@
 
 /** A matcher for functions that throw RangeError. */
 const Matcher throwsRangeError =
     const Throws(isRangeError);
 
 class _RangeError extends TypeMatcher {
   const _RangeError() : super("RangeError");
   bool matches(item, MatchState matchState) => item is RangeError;
 }
 
+// Temporary matcher for deprecated IndexOutOfRangeException.
+/** A matcher for IndexOutOfRangeExceptions. */
+const isIndexOutOfRangeException = const _IndexOutOfRangeException();
+
+/** A matcher for functions that throw IndexOutOfRangeException. */
+const Matcher throwsIndexOutOfRangeException =
+    const Throws(isIndexOutOfRangeException);
+
+class _IndexOutOfRangeException extends TypeMatcher {
+  const _IndexOutOfRangeException() : super("IndexOutOfRangeException");
+  bool matches(item, MatchState matchState) => item is IndexOutOfRangeException;
+}
+
 /** A matcher for NoSuchMethodErrors. */
 const isNoSuchMethodError = const _NoSuchMethodError();
 
 /** A matcher for functions that throw NoSuchMethodError. */
 const Matcher throwsNoSuchMethodError =
     const Throws(isNoSuchMethodError);
 
 class _NoSuchMethodError extends TypeMatcher {
   const _NoSuchMethodError() : super("NoSuchMethodError");
   bool matches(item, MatchState matchState) => item is NoSuchMethodError;
@@ skipping 211 matching lines @@
       description.add(_featureDescription).add(' ').addDescriptionOf(_matcher);
 
   Description describeMismatch(item, Description mismatchDescription,
                                MatchState matchState, bool verbose) {
     mismatchDescription.add(_featureName).add(' ');
     _matcher.describeMismatch(matchState.state['feature'], mismatchDescription,
         matchState.state['innerState'], verbose);
     return mismatchDescription;
   }
 }