blob: efce53f9baed24548742dd6ee4545cb8648161d1 [file] [log] [blame]
* 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 the case when p > n and m > q.
* @author
* @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
* This test is generated from positional_function_types_A02.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.
// SharedOptions=--enable-experiment=non-nullable
class U0 extends U1 {}
class U1 {}
class V0 {}
class V1 {}
class V2 {}
class V3 {}
class V4 {}
class S0 extends V0 {}
class S1 extends V1 {}
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 y2, [S3? y3]);
U0 t0Func(V0 x0, V1 x1, [V2? x2, V3? x3, V4? x4]) => new U0();
U1 t1Func(S0 y0, S1 y1, S2 y2, [S3? y3]) => new U1();
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;
new ReturnValueTest().testMethod();
new ReturnValueTest().testGetter;