Temporarily reintroduce IndexOutOfRangeError matcher in unittests.

lib/core/errors.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.
 
 class Error {
   const Error();
 }
 
 /**
  * Error thrown by the runtime system when an assert statement fails.
  */
 class AssertionError implements Error {
 }
 
 /**
  * Error thrown by the runtime system when a type assertion fails.
  */
 class TypeError implements AssertionError {
 }
 
 /**
  * Error thrown by the runtime system when a cast operation fails.
  */
 class CastError implements Error {
 }
 
 /**
  * Error thrown when a function is passed an unacceptable argument.
  */
- class ArgumentError implements Error {
+class ArgumentError implements Error {
   final message;
 
   /** The [message] describes the erroneous argument. */
-  const ArgumentError([this.message = ""]);
+  const ArgumentError([this.message]);
 
   String toString() {
     if (message != null) {
       return "Illegal argument(s): $message";
     }
     return "Illegal argument(s)";
   }
 }
 
 /**
  * Exception thrown because of an index outside of the valid range.
  *
- * Temporarily extends [Exception] for backwards compatiblity.
+ * Temporarily implements [IndexOutOfRangeException] for backwards compatiblity.
  */
-class RangeError extends ArgumentError implements Exception {
+class RangeError extends ArgumentError implements IndexOutOfRangeException {
   // TODO(lrn): This constructor should be called only with string values.
   // It currently isn't in all cases.
-  /** Create a new [RangeError] with the given [message]. */
-  RangeError(var message) : super("$message");
+  /**
+   * Create a new [RangeError] with the given [message].
+   *
+   * Temporarily made const for backwards compatibilty.
+   */
+  const RangeError(var message) : super(message);
 
   /** Create a new [RangeError] with a message for the given [value]. */
   RangeError.value(num value) : super("value $value");
 
   String toString() => "RangeError: $message";
 }
 
 /**
  * Temporary backwards compatibilty class.
  *
  * This class allows code throwing the old [IndexOutOfRangeException] to
  * work until they change to the new [RangeError] name.
- * Code **catching** IndexOutOfRangeException will fail to catch
- * the [RangeError] objects that are now thrown.
+ * Constructor of [RangeError] is const only to support this interface.
  */
-class IndexOutOfRangeException extends ArgumentError {
-  IndexOutOfRangeException(var message) : super(message);
+interface IndexOutOfRangeException extends Exception default RangeError {
+  const IndexOutOfRangeException(var message);
 }
 
 
 /**
  * Temporary backwards compatibility class.
  *
  * Removed when users have had time to change to using [ArgumentError].
  */
 class IllegalArgumentException extends ArgumentError {
   const IllegalArgumentException([argument = ""]) : super(argument);
@@ skipping 140 matching lines @@
 
 class OutOfMemoryError implements Error {
   const OutOfMemoryError();
   String toString() => "Out of Memory";
 }
 
 class StackOverflowError implements Error {
   const StackOverflowError();
   String toString() => "Stack Overflow";
 }