// 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.

// @dart = 2.9

/// @assertion We say that a type T0 is a subtype of a type T1 (written T0 <: T1)
/// when:
/// Super-Interface: T0 is an interface type with super-interfaces S0,...Sn
/// - and Si <: T1 for some i
/// @description Check that if type T0 is an interface type with super-interfaces
/// S0,...Sn and and Si <: T1 for some i then T0 is a subtype of a type T1. Test
/// the case when S1 extends T1
/// @author sgrekhov@unipro.ru


class T1 {}

abstract class S0 {}
abstract class S1 extends T1 {}
abstract class S2 {}

abstract class T0 implements S0, S1, S2  {}

class T implements T0 {}

T0 t0Instance = new T();
T1 t1Instance = new T1();

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