Improve matchers for enums defined by the analysis server API.

pkg/analysis_server/tool/spec/codegen_matchers.dart

 // Copyright (c) 2014, 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.
 
 /**
  * Code generation for the file "matchers.dart".
  */
 library codegen.matchers;
 
 import 'dart:convert';
@@ skipping 85 matching lines @@
     makeMatcher(camelKind, 'options', refactoring.options);
   }
 
   @override
   visitTypeDefinition(TypeDefinition typeDefinition) {
     makeMatcher(typeDefinition.name, null, typeDefinition.type);
   }
 
   @override
   visitTypeEnum(TypeEnum typeEnum) {
-    writeln('isIn([');
+    writeln('new MatchesEnum(${JSON.encode(context)}, [');
     indent(() {
       bool commaNeeded = false;
       for (TypeEnumValue value in typeEnum.values) {
         if (commaNeeded) {
           writeln(',');
         }
         write('${JSON.encode(value.value)}');
         commaNeeded = true;
       }
       writeln();
@@ skipping 73 matching lines @@
 
 /**
  * Translate spec_input.html into protocol_matchers.dart.
  */
 main() {
   CodegenMatchersVisitor visitor = new CodegenMatchersVisitor(readApi());
   String code = visitor.collectCode(visitor.visitApi);
   File outputFile = new File('../../test/integration/protocol_matchers.dart');
   outputFile.writeAsStringSync(code);
 }