Proper handling of built-in identifiers

tests/language/src/NamingTest.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.
 
 class A {
   A() { NamingTest.count++; }
   foo(a, b) {
     Expect.equals(1, a);
     Expect.equals(2, b);
   }
@@ skipping 164 matching lines @@
   var f_;
   Hoisting.negate(var x) {
     f_ = () { return x; };
   }
 
   operator negate() {
     var x = 3;
     return () { return x + 1; };
   }
 
-  negate(x) {
-    return () { return x + 2; };
-  }
-
   operator[] (x) {
     return () { return x + 3; };
   }
 
   static void test() {
     var h = new Hoisting.negate(1);
     Expect.equals(1, (h.f_)());
     var f = -h;
     Expect.equals(4, f());
-    Expect.equals(6, h.negate(4)());
+    Expect.equals(4, h.negate()());
     Expect.equals(7, h[4]());
   }
 }
 
 // It is not possible to make sure that the backend uses the hardcoded names
 // we are testing against. This test might therefore become rapidly out of date
 class NamingTest {
   static int count;
 
   static testExceptionNaming() {
@@ skipping 302 matching lines @@
   Naming2Test() { }
   int get foo() { return 1; }
   set foo(x) { }
 
   static void main(args) {
     var a = new Naming2Test();
     Expect.throws(() => a.foo(2), (e) => e is ObjectNotClosureException);
   }
 }
 
-// Ensure we don't have false positivesj.
-class Naming3Test {
-  Naming3Test() { }
-  operator negate() { }
-  negate() => 777;
-
-  static void main(args) {
-    var a = new Naming3Test();
-    Expect.equals(777, a.negate());
-  }
-}
-
 main() {
   NamingTest.testMain();
   Naming1Test.main(null);
   Naming2Test.main(null);
-  Naming3Test.main(null);
 }