Fix code generated matchers to handle recursive objects.

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 118 matching lines @@
   visitTypeMap(TypeMap typeMap) {
     write('isMapOf(');
     visitTypeDecl(typeMap.keyType);
     write(', ');
     visitTypeDecl(typeMap.valueType);
     write(')');
   }
 
   @override
   void visitTypeObject(TypeObject typeObject) {
-    writeln('new MatchesJsonObject(');
+    writeln('new LazyMatcher(() => new MatchesJsonObject(');
     indent(() {
       write('${JSON.encode(context)}, ');
       Iterable<TypeObjectField> requiredFields = typeObject.fields.where(
           (TypeObjectField field) => !field.optional);
       outputObjectFields(requiredFields);
       List<TypeObjectField> optionalFields = typeObject.fields.where(
           (TypeObjectField field) => field.optional).toList();
       if (optionalFields.isNotEmpty) {
         write(', optionalFields: ');
         outputObjectFields(optionalFields);
       }
     });
-    write(')');
+    write('))');
   }
 
   /**
    * Generate a map describing the given set of fields, for use as the
    * 'requiredFields' or 'optionalFields' argument to the [MatchesJsonObject]
    * constructor.
    */
   void outputObjectFields(Iterable<TypeObjectField> fields) {
     if (fields.isEmpty) {
       write('null');
@@ skipping 44 matching lines @@
   CodegenMatchersVisitor visitor = new CodegenMatchersVisitor(readApi());
   return visitor.collectCode(visitor.visitApi);
 });
 
 /**
  * Translate spec_input.html into protocol_matchers.dart.
  */
 main() {
   target.generate();
 }