Implement super calls.

frog/leg/warnings.dart

 // Copyright (c) 2011, 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 MessageKind {
   final String template;
   const MessageKind(this.template);
 
   static final GENERIC = const MessageKind('#{1}');
 
@@ skipping 26 matching lines @@
       'not all paths lead to a return or throw statement');
 
   static final CANNOT_RESOLVE = const MessageKind(
       'cannot resolve #{1}');
   static final CANNOT_RESOLVE_TYPE = const MessageKind(
       'cannot resolve type #{1}');
   static final DUPLICATE_DEFINITION = const MessageKind(
       'duplicate definition of #{1}');
   static final NOT_A_TYPE = const MessageKind(
       '#{1} is not a type');
+  static final NO_SUPER_IN_OBJECT = const MessageKind(
+      '\'Object\' does not have a superclass');
   static final CANNOT_FIND_CONSTRUCTOR = const MessageKind(
       'cannot find constructor #{1}');
   static final INVALID_RECEIVER_IN_INITIALIZER = const MessageKind(
       'field initializer expected');
   static final NO_THIS_IN_STATIC = const MessageKind(
       '\'this\' is only available in instance methods');
+  static final NO_SUPER_IN_STATIC = const MessageKind(
+      '\'super\' is only available in instance methods');
   static final DUPLICATE_INITIALIZER = const MessageKind(
       'field #{1} is initialized more than once');
   static final ALREADY_INITIALIZED = const MessageKind(
       '#{1} was already initialized here');
   static final INIT_STATIC_FIELD = const MessageKind(
       'cannot initialize static field #{1}');
   static final NOT_A_FIELD = const MessageKind(
       '#{1} is not a field');
 
   toString() => template;
 }
 
 class Message {
   final kind;
   final List arguments;
   String message;
 
   Message(this.kind, this.arguments);
 
   String toString() {
     if (message === null) {
       message = kind.template;
       int position = 1;
       for (var argument in arguments) {
-        message = message.replaceAll('#{${position++}}',
-                                     argument.toString());
+        message = message.replaceAll('#{${position++}}', argument.toString());
       }
     }
     return message;
   }
 
   bool operator==(other) {
     if (other is !Message) return false;
     return (kind == other.kind) && (toString() == other.toString());
   }
 }
@@ skipping 14 matching lines @@
   String toString() => message.toString();
 }
 
 class ResolutionWarning {
   final Message message;
   ResolutionWarning.message(this.message);
   ResolutionWarning(MessageKind kind, List<Type> arguments)
     : message = new Message(kind, arguments);
   String toString() => message.toString();
 }