// 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 We say that a type T0 is a subtype of a type T1 (written T0 <: T1)
 * when:
 * Left Null: if T0 is Null then:
 * - if T1 is a type variable (promoted or not) the query is false
 * - If T1 is FutureOr<S> for some S, then the query is true iff Null <: S.
 * - If T1 is Null, S? or S* for some S, then the query is true.
 * - Otherwise, the query is false
 * @description Check that if type T0 is Null and If T1 is S? then T0 is
 * subtype of T1
 * @author sgrekhov@unipro.ru
 */
/**
 * @description Check that if type T0 is a subtype of a type T1, then instance
 * of T0 can be be assigned to the mixin member of type T1
 * @author sgrekhov@unipro.ru
 */
/*
 * This test is generated from left_null_A05.dart and 
 * class_member_x03.dart.
 * Don't modify it. If you want to change this file, change one of the files 
 * above and then run generator.dart to regenerate the tests.
 */


class S {
  const S();
}

Null t0Instance = null;
S? t1Instance = new S();

const t1Default = const S();


class ClassMemberMixin1_t03 {
  S? m = t1Default;

  void set superSetter(dynamic val) {}
}

class ClassMember1_t03 extends Object with ClassMemberMixin1_t03 {
  test() {
    m = t0Instance;
    superSetter = t0Instance;
  }
}

main() {
  ClassMember1_t03 c1 = new ClassMember1_t03();
  c1.m = t0Instance;
  c1.test();
  c1.superSetter = t0Instance;
}