/*
 * 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 Null type 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 be used as a return value of type T1
 * @author sgrekhov@unipro.ru
 */
/*
 * This test is generated from positional_function_types_A31.dart and 
 * return_value_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.
 */


import '../../utils/common.dart';

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]);
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]) =>
    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]) =>
    null;

T0 t0Instance = t0Func;
T1 t1Instance = 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

}