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 /* * 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(V0 x0, ..., Vn xn, [Vn+1 xn+1, ..., Vm xm]) * * and T1 is U1 Function(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_A33.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. */ class A {} class C extends A {} class U0 extends U1 {} class U1 {} class B0 {} class B1 {} 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 {} class X0 extends B0 {} class X1 extends B1 {} class Y0 extends B0 {} class Y1 extends B1 {} typedef T0 = U0 Function( V0 x0, V1 x1, [V2 x2, V3 x3, V4 x4]); typedef T1 = U1 Function( S0 y0, S1 y1, [S2 x2, S3 x3]); U0 t0Func( V0 x0, V1 x1, [V2 x2, V3 x3, V4 x4]) => null; U1 t1Func( S0 y0, S1 y1, [S2 x2, S3 x3]) => null; T0 t0Instance = t0Func; T1 t1Instance = 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; }