Revert "Remove NullPointerException."

sdk/lib/core/exceptions.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.
 
 // Exceptions are thrown either by the VM or from Dart code.
 
 /**
  * Interface implemented by all core library exceptions.
  * Defaults to an implementation that only carries a simple message.
  */
@@ skipping 22 matching lines @@
 
   /**
    * Creates a new FormatException with an optional error [message].
    */
   const FormatException([this.message = ""]);
 
   String toString() => "FormatException: $message";
 }
 
 
+class NullPointerException implements Exception {
+  const NullPointerException([this.functionName, this.arguments = const []]);
+  String toString() {
+    if (functionName == null) {
+      return exceptionName;
+    } else {
+      return "$exceptionName : method: '$functionName'\n"
+          "Receiver: null\n"
+          "Arguments: $arguments";
+    }
+  }
+
+  String get exceptionName => "NullPointerException";
+
+  final String functionName;
+  final List arguments;
+}
+
+
 class IllegalJSRegExpException implements Exception {
   const IllegalJSRegExpException(String this._pattern, String this._errmsg);
   String toString() => "IllegalJSRegExpException: '$_pattern' '$_errmsg'";
   final String _pattern;
   final String _errmsg;
 }
 
 
 class IntegerDivisionByZeroException implements Exception {
   const IntegerDivisionByZeroException();
   String toString() => "IntegerDivisionByZeroException";
 }
 
 /**
  * Exception thrown when a runtime error occurs.
  */
 class RuntimeError implements Exception {
   final message;
   RuntimeError(this.message);
   String toString() => "RuntimeError: $message";
 }