Remove support for mixin typedefs in dart2js.

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 144 matching lines @@
   CYCLIC_TYPEDEF,
   CYCLIC_TYPEDEF_ONE,
   DART_EXT_NOT_SUPPORTED,
   DEFERRED_COMPILE_TIME_CONSTANT,
   DEFERRED_COMPILE_TIME_CONSTANT_CONSTRUCTION,
   DEFERRED_LIBRARY_DART_2_DART,
   DEFERRED_LIBRARY_DUPLICATE_PREFIX,
   DEFERRED_LIBRARY_WITHOUT_PREFIX,
   DEFERRED_OLD_SYNTAX,
   DEFERRED_TYPE_ANNOTATION,
-  DEPRECATED_TYPEDEF_MIXIN_SYNTAX,
   DIRECTLY_THROWING_NSM,
   DISALLOWED_LIBRARY_IMPORT,
   DUPLICATE_DEFINITION,
   DUPLICATE_EXPORT,
   DUPLICATE_EXPORT_CONT,
   DUPLICATE_EXPORT_DECL,
   DUPLICATE_EXTENDS_IMPLEMENTS,
   DUPLICATE_IMPLEMENTS,
   DUPLICATE_IMPORT,
   DUPLICATE_INITIALIZER,
@@ skipping 1450 matching lines @@
       MessageKind.CANNOT_MIXIN: const MessageTemplate(
           MessageKind.CANNOT_MIXIN, "The type '#{type}' can't be mixed in.",
           howToFix: "Try removing '#{type}' from the 'with' clause.",
           examples: const [
             """
 class C extends Object with String {}
 
 main() => new C();
 """,
             """
-typedef C = Object with String;
+class C = Object with String;
 
 main() => new C();
 """
           ]),
 
       MessageKind.CANNOT_EXTEND_ENUM: const MessageTemplate(
           MessageKind.CANNOT_EXTEND_ENUM,
           "Class '#{className}' can't extend the type '#{enumType}' because "
           "it is declared by an enum.",
           howToFix: "Try making '#{enumType}' a normal class or removing the "
@@ skipping 827 matching lines @@
           "'!==' is not an operator. "
           "Did you mean '#{lhs} != #{rhs}' or '!identical(#{lhs}, #{rhs})'?"),
 
       MessageKind.UNSUPPORTED_PREFIX_PLUS: const MessageTemplate(
           MessageKind.UNSUPPORTED_PREFIX_PLUS, "'+' is not a prefix operator. ",
           howToFix: "Try removing '+'.",
           examples: const [
             "main() => +2;  // No longer a valid way to write '2'"
           ]),
 
-      MessageKind.DEPRECATED_TYPEDEF_MIXIN_SYNTAX: const MessageTemplate(
-          MessageKind.DEPRECATED_TYPEDEF_MIXIN_SYNTAX,
-          "'typedef' not allowed here. ",
-          howToFix: "Try replacing 'typedef' with 'class'.",
-          examples: const [
-            """
-class B { }
-class M1 {  }
-typedef C = B with M1;  // Need to replace 'typedef' with 'class'.
-main() { new C(); }
-"""
-          ]),
-
       MessageKind.MIRRORS_EXPECTED_STRING: const MessageTemplate(
           MessageKind.MIRRORS_EXPECTED_STRING,
           "Can't use '#{name}' here because it's an instance of '#{type}' "
           "and a 'String' value is expected.",
           howToFix: "Did you forget to add quotes?",
           examples: const [
             """
 // 'Foo' is a type literal, not a string.
 @MirrorsUsed(symbols: const [Foo])
 import 'dart:mirrors';
@@ skipping 1328 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';
   }
 }