// 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 Promoted Variable: T0 is a promoted type variable X0 & S0
/// and S0 <: T1
/// @description Check that if type T0 is a promoted type variable X0 & S0 and S0
/// is subtype of T1 then T0 is a subtype of T1.
/// @author sgrekhov@unipro.ru

class T1 {
  const T1();
}
class X0 {}
class S0 extends X0 implements T1 {}

//# @T0 = X0
//# @T1 = T1

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

const t1Default = const T1();

//# <!-- Global variables & classes definition -->

main() {
  X0 t0Instance = new S0();

  if (t0Instance is S0) {
    //# <!-- Test body -->
  }
}