|  | // Copyright (c) 2020, 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. | 
|  |  | 
|  | // @dart=2.6 | 
|  |  | 
|  | import 'nsm_from_opt_in_lib.dart'; | 
|  |  | 
|  | abstract class A2 implements A { | 
|  | @override | 
|  | noSuchMethod(Invocation invocation) { | 
|  | return super.noSuchMethod(invocation); | 
|  | } | 
|  | } | 
|  |  | 
|  | abstract class B2 extends A implements C2 { | 
|  | @override | 
|  | noSuchMethod(Invocation invocation) { | 
|  | return super.noSuchMethod(invocation); | 
|  | } | 
|  | } | 
|  |  | 
|  | abstract class C2 { | 
|  | int method(int i, {optional}); | 
|  | T genericMethod1<T>(T t); | 
|  | T genericMethod2<T extends Object>(T t); | 
|  | T genericMethod3<T extends Object>(T t); | 
|  | } | 
|  |  | 
|  | main() {} |