|  | // Copyright (c) 2018, 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=-O1 | 
|  |  | 
|  | // Formatting can break multitests, so don't format them. | 
|  | // dart format off | 
|  |  | 
|  | import 'package:expect/expect.dart'; | 
|  |  | 
|  | class A { | 
|  | String? field; | 
|  | } | 
|  |  | 
|  | class B { | 
|  | int? field; | 
|  | } | 
|  |  | 
|  | @pragma('dart2js:noInline') | 
|  | assign(d) { | 
|  | d.field = 0; | 
|  | } | 
|  |  | 
|  | main() { | 
|  | Expect.throws(() => assign(new A())); | 
|  | assign(new B()); //# 01: ok | 
|  | } |