Fix incremental parsing when class name is changed.

pkg/analyzer/test/generated/parser_test.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.
 
 library engine.parser_test;
 
 import 'package:analyzer/src/generated/ast.dart';
 import 'package:analyzer/src/generated/element.dart';
 import 'package:analyzer/src/generated/error.dart';
 import 'package:analyzer/src/generated/incremental_scanner.dart';
@@ skipping 2690 matching lines @@
     // "f() => a + b;  "
     _assertParse("f() => a + b;", "", "  ", "");
   }
 
   void test_insert_whitespace_middle() {
     // "f() => a + b;"
     // "f() => a  + b;"
     _assertParse("f() => a", "", " ", " + b;");
   }
 
+  void test_rename_class_withConstructor() {
+    // "class C { C() {} }"
+    // "class D { C() {} }"
+    _assertParse('class ', 'C', 'D', ' { C() {} }');
+  }
+
   void test_replace_field_type_with_void() {
     // Note: this produces an error, but we still need the parser to produce a
     // consistent parse tree for it.
     _assertParse('class C { ', 'int', 'void', ' x; }');
   }
 
   void test_replace_identifier_beginning() {
     // "f() => bell + b;"
     // "f() => fell + b;"
     _assertParse("f() => ", "b", "f", "ell + b;");
@@ skipping 8117 matching lines @@
     // Parse the source.
     //
     Parser parser = new Parser(null, listener);
     return invokeParserMethodImpl(
         parser,
         methodName,
         <Object>[tokenStream],
         tokenStream) as Token;
   }
 }