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// 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.
/// @assertion The NORM relation defines the canonical representative of classes
/// of equivalent types...
/// This is based on the following equations:
/// void? == void
/// @description Checks that void? == void
/// @author
// Requirements=nnbd-strong
class A<X> {}
class B<X> implements A<X?> {}
class C extends B<void> implements A<void> {}
main() {
new C();