/*
 * 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 A type T0 is a subtype of a type T1 (written T0 <: T1) when:
 * Named Function Types: T0 is U0 Function<X0 extends B00, ..., Xk extends B0k>
 *   (T0 x0, ..., Tn xn, {Tn+1 xn+1, ..., Tm xm})
 *
 * and T1 is U1 Function<Y0 extends B10, ..., Yk extends B1k>(S0 y0, ..., Sn yn,
 * {Sn+1 yn+1, ..., Sq yq})
 * and {yn+1, ... , yq} subsetof {xn+1, ... , xm}
 * and Si[Z0/Y0, ..., Zk/Yk] <: Vi[Z0/X0, ..., Zk/Xk] for i in 0...n
 * and Si[Z0/Y0, ..., Zk/Yk] <: Tj[Z0/X0, ..., Zk/Xk] for i in n+1...q, yj = xi
 * and U0[Z0/X0, ..., Zk/Xk] <: U1[Z0/Y0, ..., Zk/Yk]
 * and B0i[Z0/X0, ..., Zk/Xk] === B1i[Z0/Y0, ..., Zk/Yk] for i in 0...k
 * where the Zi are fresh type variables with bounds B0i[Z0/X0, ..., Zk/Xk]
 * @description Check that if there is i in 0...n such that
 * Si[Z0/Y0, ..., Zk/Yk] is not subtype of Vi[Z0/X0, ..., Zk/Xk], then T0 is not
 * a subtype of T1
 * @author sgrekhov@unipro.ru
 */
/**
 * @description Check that if type T0 not a subtype of a type T1, then instance
 * of T0 cannot be be used as a return value of type T1. Return value is tested.
 * @compile-error
 * @author sgrekhov@unipro.ru
 * @author ngl@unipro.ru
 */
/*
 * This test is generated from named_function_types_fail_A21.dart and 
 * return_value_fail_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 U0 extends U1 {}
class U1 {}
class V0 {}
class V1 {}
class V2 {}
class V3 {}
class V4 {}
class S0 extends V0 {}
class S1 {}
class S2 extends V2 {}
class S3 extends V3 {}

typedef T0 = U0 Function(V0 x0, V1 x1, {V2 x2, V3 x3, V4 x4});
typedef T1 = U1 Function(S0 y0, S1 y1, {S2 x2, S3 x3}); // S1 is not subtype of V1

U0 t0Func(V0 x0, V1 x1, {V2 x2, V3 x3, V4 x4}) => null;
U1 t1Func(S0 y0, S1 y1, {S2 x2, S3 x3}) => null;

T0 t0Instance = t0Func;
T1 t1Instance = t1Func;


T1 returnValueFunc() => t0Instance; //# 01: compile-time error

class ReturnValueTest {
  static T1 staticTestMethod() => t0Instance; //# 03: compile-time error
  T1 testMethod() => t0Instance; //# 04: compile-time error
  T1 get testGetter => t0Instance; //# 05: compile-time error
}

main() {
  returnValueFunc(); //# 01: compile-time error

  T1 returnValueLocalFunc() => t0Instance; //# 02: compile-time error
  returnValueLocalFunc(); //# 02: compile-time error

  ReturnValueTest.staticTestMethod(); //# 03: compile-time error
  new ReturnValueTest().testMethod(); //# 04: compile-time error
  new ReturnValueTest().testGetter; //# 05: compile-time error
}