pkg/front_end/testcases/general/external_method.dart

// 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=2.9
external void externalMethod();

class Class {
  external void externalMethod();
}

void main() {}