// 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:
/// 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 with high-level types and the case 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 test_types/positional_function_types_A21.dart and 
/// test_cases/return_value_x01.dart. Don't modify it! 
/// If you need to change this test, then change one of the files above and then 
/// run generator/generator.dart to regenerate the tests.

class A {}

class C extends A {}

class U0<X, Y, Z> extends U1<X, Y, Z> {}

class U1<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> {}

class S0<X, Y, Z> extends V0<X, Y, Z> {}

class S1<X, Y, Z> extends V1<X, Y, Z> {}

class S2<X, Y, Z> extends V2<X, Y, Z> {}

class S3<X, Y, Z> extends V3<X, Y, Z> {}

class X0<X, Y, Z> extends B0<X, Y, Z> {}

class X1<X, Y, Z> extends B1<X, Y, Z> {}

class Y0<X, Y, Z> extends B0<X, Y, Z> {}

class Y1<X, Y, Z> extends B1<X, Y, Z> {}

typedef T0 = U0<C, List<String>, int> Function<X extends B0, Y extends B1>(
    V0<dynamic, void, Object> x0, V1<dynamic, void, Object> x1,
    [V2<dynamic, void, Object>? x2, V3<dynamic, void, Object>? x3]);

typedef T1 = U1<dynamic, void, Object> Function<X extends B0, Y extends B1>(
    S0<C, List<String>, int> y0, S1<C, List<String>, int> y1,
    [S2<C, List<String>, int>? x2, S3<C, List<String>, int>? x3]);

U0<C, List<String>, int> t0Func<X extends B0, Y extends B1>(
        V0<dynamic, void, Object> x0, V1<dynamic, void, Object> x1,
        [V2<dynamic, void, Object>? x2, V3<dynamic, void, Object>? x3]) =>
    new U0<C, List<String>, int>();

U1<dynamic, void, Object> t1Func<X extends B0, Y extends B1>(
        S0<C, List<String>, int> y0, S1<C, List<String>, int> y1,
        [S2<C, List<String>, int>? x2, S3<C, List<String>, int>? x3]) =>
    new U1<dynamic, void, Object>();

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

T1 returnValueFunc() => t0Instance;

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

  T1 testMethod() => t0Instance;

  T1 get testGetter => t0Instance;
}

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

  returnValueFunc();
  returnValueLocalFunc();

  ReturnValueTest.staticTestMethod();

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