// 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} subset of {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 T0 and T1 satisfies the rules above, then T0 is
/// subtype of T1. Test generic types with Null type
/// @author sgrekhov@unipro.ru
///
/// @description Check that if type T0 is a subtype of a type T1, then instance
/// of T0 can be be used as a return value of type T1
/// @author sgrekhov@unipro.ru
///
/// This test is generated from named_function_types_A04.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.


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<Null, Null, Null> 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, V4<A?, List?, num?>? x4});
typedef T1 = U1<A?, List?, num?> Function<X extends B0, Y extends B1>(
    S0<Null, Null, Null> y0, S1<Null, Null, Null> y1,
    {S2<Null, Null, Null>? x2, S3<Null, Null, Null>? x3});

U0<Null, Null, Null> 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, V4<A?, List?, num?>? x4}) =>
    new U0<Null, Null, Null>();
U1<A?, List?, num?> t1Func<X extends B0, Y extends B1>(
        S0<Null, Null, Null> y0, S1<Null, Null, Null> y1,
        {S2<Null, Null, Null>? x2, S3<Null, Null, Null>? x3}) =>
    new U1<A?, List?, num?>();

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;

}