Support multiple categories per message.

pkg/compiler/lib/src/diagnostics/messages.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.
 
 
 /**
  * The messages in this file should meet the following guide lines:
  *
  * 1. The message should be a complete sentence starting with an uppercase
  * letter, and ending with a period.
@@ skipping 500 matching lines @@
   // The key type is a union of MessageKind and SharedMessageKind.
   static final Map<dynamic, MessageTemplate> TEMPLATES =
       <dynamic, MessageTemplate>{}
     ..addAll(shared_messages.TEMPLATES)
     ..addAll(const<MessageKind, MessageTemplate>{
       /// Do not use this. It is here for legacy and debugging. It violates item
       /// 4 of the guide lines for error messages in the beginning of the file.
       MessageKind.GENERIC:
         const MessageTemplate(MessageKind.GENERIC, '#{text}'),
 
-      MessageKind.NOT_ASSIGNABLE:
-        const MessageTemplate(MessageKind.NOT_ASSIGNABLE,
-          "'#{fromType}' is not assignable to '#{toType}'."),
-
-      MessageKind.FORIN_NOT_ASSIGNABLE:
-        const MessageTemplate(MessageKind.FORIN_NOT_ASSIGNABLE,
-          "The element type '#{currentType}' of '#{expressionType}' "
-          "is not assignable to '#{elementType}'."),
-
       MessageKind.VOID_EXPRESSION:
         const MessageTemplate(MessageKind.VOID_EXPRESSION,
           "Expression does not yield a value."),
 
       MessageKind.VOID_VARIABLE:
         const MessageTemplate(MessageKind.VOID_VARIABLE,
           "Variable cannot be of type void."),
 
       MessageKind.RETURN_VALUE_IN_VOID:
         const MessageTemplate(MessageKind.RETURN_VALUE_IN_VOID,
@@ skipping 3124 matching lines @@
   static String convertToString(value) {
     if (value is ErrorToken) {
       // Shouldn't happen.
       return value.assertionMessage;
     } else if (value is Token) {
       value = value.value;
     }
     return '$value';
   }
 }