LanguageFeatures/Extension-methods/semantics_of_invocations_t06.dart

/*
 * Copyright (c) 2019, 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 If an extension is found to be the one applying to a member
 * invocation, then at run-time, the invocation will perform a method invocation
 * of the corresponding instance member of the extension, with [this] bound to
 * the receiver value and type parameters bound to the types found by static
 * inference.
 * @description Check that type parameters bounds to the types found by static
 * inference.
 * @author iarkh@unipro.ru
 */
// SharedOptions=--enable-experiment=extension-methods

import "../../Utils/expect.dart";

class A<T> {}
class B {}
class C extends B {}

extension ExtendedA<T> on A<T> {
  void test(dynamic expected) {
    Expect.equals(expected, T);
  }
}

main() {
  A<B> a1 = A<B>();
  a1.test(B);

  A<C> a2 = A<C>();
  a2.test(C);

  A<B> a3 = A<C>();
  a3.test(B);
}