// 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:
 * Right Nullable: if T1 is S1? then:
 *  T0 <: T1 iff any of the following hold:
 *  either T0 <: S1
 *  or T0 <: Null
 *  or T0 is X0 and X0 has bound S0 and S0 <: T1
 *  or T0 is X0 & S0 and S0 <: T1
 * @description Check that if type T1 is S1? and T0 is Null 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 to global variable of type T1
 * @author sgrekhov@unipro.ru
 */
/*
 * This test is generated from right_nullable_A02.dart and 
 * global_variable_x01.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 S1 {
  const S1();
}

Null t0Instance = null;
S1? t1Instance = new S1();

const t1Default = const S1();


class GlobalVariableTest {
  GlobalVariableTest() {
    t1Instance = t0Instance;
  }

  foo() {
    t1Instance = t0Instance;
  }

  static test() {
    t1Instance = t0Instance;
  }
}

main() {
  bar () {
    t1Instance = t0Instance;
  }

  t1Instance = t0Instance;
  bar();
  GlobalVariableTest t = new GlobalVariableTest();
  t.foo();
  GlobalVariableTest.test();
}