tests/language_2/regress/regress34896_test.dart

// 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.

// Regression test: verify super-signatures of super-invoked methods of a
// mixin against the superclass, not signatures in the mixin.

class A<T> {
  void remove(T x) {}
}

mixin M<U> on A<U> {
  void remove(Object x) {
    super.remove(x as U);
  }
}

class X<T> = A<T> with M<T>;

main() {}