// 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:
/// Type Variable Reflexivity 1: T0 is a type variable X0 or a promoted type
/// variables X0 & S0 and T1 is X0
/// @description Check that if type T0 a promoted type variables X0 & S0 and T1
/// is X0 then T0 is a subtype of T1.
/// @author sgrekhov@unipro.ru

class X0 {
  const X0();
}
class S0 extends X0 {
}
//# @T0 = S0
//# @T1 = X0

X0 t0Instance = new S0();
X0 t1Instance = new X0();

const t1Default = const X0();

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

main() {
  X0 t0Instance = new S0();
  if (t0Instance is S0) {
    //# <!-- Test body -->
  }
}