// 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.

/// @assertionA type T0 is a subtype of a type T1 (written T0 <: T1) when:
/// Positional Function Types: T0 is U0 Function<X0 extends B00, ... ,
/// Xk extends B0k>(V0 x0, ..., Vn xn, [Vn+1 xn+1, ..., Vm xm])
///
///  and T1 is U1 Function<Y0 extends B10, ..., Yk extends B1k>(S0 y0, ...,
///  Sp yp, [Sp+1 yp+1, ..., Sq yq])
///  and p >= n
///  and m >= q
///  and Si[Z0/Y0, ..., Zk/Yk] <: Vi[Z0/X0, ..., Zk/Xk] for i in 0...q
///  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 T0 and T1 satisfies the rules above, then T0 is
/// subtype of T1. Test generic types when p == n and m == q
/// @author sgrekhov@unipro.ru
///
/// @description Check that if type T0 is a subtype of a type T1, then instance
/// of T0 can be used as a return value of type T1
/// @author sgrekhov@unipro.ru
///
/// This test is generated from positional_function_types_A41.dart and 
/// return_value_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';

class A {}

class C extends A {}

class U<X, Y, Z> {}

class B0<X, Y, Z> {}

class B1<X, Y, Z> {}

class V0<X, Y, Z> {}

class V1<X, Y, Z> {}

class V2<X, Y, Z> {}

class V3<X, Y, Z> {}

class V4<X, Y, Z> {}

typedef T0 = U<C, List<String>, int> Function<X extends B0, Y extends B1>(
    V0<A, List, num> x0, V1<A, List, num> x1,
    [V2<A, List, num>? x2, V3<A, List, num>? x3]);
typedef T1 = U<A, List, num> Function<X extends B0, Y extends B1>(
    V0<C, List<String>, int> y0, V1<C, List<String>, int> y1,
    [V2<C, List<String>, int>? x2, V3<C, List<String>, int>? x3]);

U<C, List<String>, int> t0Func<X extends B0, Y extends B1>(
        V0<A, List, num> x0, V1<A, List, num> x1,
        [V2<A, List, num>? x2, V3<A, List, num>? x3]) =>
    new U<C, List<String>, int>();
U<A, List, num> t1Func<X extends B0, Y extends B1>(
        V0<C, List<String>, int> y0, V1<C, List<String>, int> y1,
        [V2<C, List<String>, int>? x2, V3<C, List<String>, int>? x3]) =>
    new U<A, List, num>();

T0 t0Instance = t0Func;
T1 t1Instance = t1Func;
const t1Default = t1Func;


T1 returnValueFunc() => forgetType(t0Instance);

class ReturnValueTest {
  static T1 staticTestMethod() => forgetType(t0Instance);

  T1 testMethod() => forgetType(t0Instance);

  T1 get testGetter => forgetType(t0Instance);
}

class ReturnValueGen<X> {
  X testMethod() => forgetType(t0Instance);
  X get testGetter => forgetType(t0Instance);
}


main() {
  T1 returnValueLocalFunc() => forgetType(t0Instance);

  returnValueFunc();
  returnValueLocalFunc();

  ReturnValueTest.staticTestMethod();

  new ReturnValueTest().testMethod();
  new ReturnValueTest().testGetter;

  // Test type parameters

}