Clean up operator names.

dart/tests/language/operator_negate_and_method_negate_test.dart

 // Copyright (c) 2012, 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.
 
-void main() {
-  var foo = new Foo();
-  var bar = new Bar(); /// 01: compile-time error
+// This checks that it is possible to have a method named negate as
+// well as unary- operator.
+
+class Foo {
+  operator-() => 42;
+  negate() => 87;
 }
 
-class Foo {
-  factory Foo() => null;
+main() {
+  Expect.equals(42, -new Foo());
+  Expect.equals(87, new Foo().negate());
 }
-
-class Bar extends Foo {
-  Bar(); /// 01: continued
-}