// 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.

/// @assertion We say that a type T0 is a subtype of a type T1 (written T0 <: T1)
/// when:
/// Left Nullable: if T0 is S0? then:
/// - T0 <: T1 iff S0 <: T1 and Null <: T1
/// @description Check that if type T0 is S0? and S0 <: T1 but Null is not
/// subtype T1 then T0 is not subtype of T1.
/// @author sgrekhov@unipro.ru
///
/// @description Check that if type T0 is not a subtype of a type T1, then
/// instance of T0 cannot be assigned to the to global variable of type T1
/// @author sgrekhov@unipro.ru
///
/// This test is generated from left_nullable_fail_A01.dart and 
/// global_variable_fail_x01.dart.
/// Don't modify it. If you want to change this test, change one of the files 
/// above and then run generator.dart to regenerate the tests.


import '../../utils/common.dart';
import '../../../../Utils/expect.dart';

// Requirements=nnbd-strong

class T1 {
  const T1();
}
class S0 extends T1 {
  const S0();
}

S0? t0Instance = null;
T1 t1Instance = new T1();

const t1Default = const T1();


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

  GlobalVariableTest.valid() {}

  foo() {
    t1Instance = forgetType(t0Instance);
  }

  static test() {
    t1Instance = forgetType(t0Instance);
  }
}

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

  Expect.throws(() {
    t1Instance = forgetType(t0Instance);
  }, (e) => e is TypeError || e is CastError);

  Expect.throws(() {
    bar();
  }, (e) => e is TypeError || e is CastError);

  Expect.throws(() {
    new GlobalVariableTest();
  }, (e) => e is TypeError || e is CastError);

  Expect.throws(() {
    new GlobalVariableTest.valid().foo();
  }, (e) => e is TypeError || e is CastError);

  Expect.throws(() {
    GlobalVariableTest.test();
  }, (e) => e is TypeError || e is CastError);
}