|  | // Copyright (c) 2021, 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. | 
|  | // | 
|  | // dart2jsOptions=--null-assertions --enable-asserts | 
|  |  | 
|  | @pragma('dart2js:noInline') | 
|  | confuse(x) => x; | 
|  |  | 
|  | class MyObject { | 
|  | // Operator == _not_ overridden. | 
|  | } | 
|  |  | 
|  | class MyObject2 { | 
|  | @override | 
|  | bool operator ==(other) => other is MyObject2; | 
|  | } | 
|  |  | 
|  | void main() { | 
|  | confuse(MyObject2()); | 
|  | print(confuse(MyObject()) == confuse(null)); | 
|  | } |