Allow methods to be named ‘factory’

tests/language/method_name_test.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.
 
 import "package:expect/expect.dart";
 
 // Tests that methods with names "get", "set" and "operator" don't
 // cause fatal problems.
 
 // With return type.
 class A {
   int get() {return 1;}
   int set() {return 2;}
   int operator() {return 3;}
+  int factory() { return 4; }
 }
 
 // Without return types.
 class B {
   get() {return 1;}
   set() {return 2;}
   operator() {return 3;}
+  factory() { return 4; }
 }
 
 main() {
   {
     A a = new A();
     Expect.equals(1, a.get());
     Expect.equals(2, a.set());
     Expect.equals(3, a.operator());
+    Expect.equals(4, a.factory());
   }
   {
     B b = new B();
     Expect.equals(1, b.get());
     Expect.equals(2, b.set());
     Expect.equals(3, b.operator());
+    Expect.equals(4, b.factory());
   }
 }