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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: * Named Function Types: T0 is U0 Function * (T0 x0, ..., Tn xn, {Tn+1 xn+1, ..., Tm xm}) * * and T1 is U1 Function(S0 y0, ..., Sn yn, * {Sn+1 yn+1, ..., Sq yq}) * and {yn+1, ... , yq} subsetof {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 there is i in n+1...q such that * Si[Z0/Y0, ..., Zk/Yk] is not subtype of Tj[Z0/X0, ..., Zk/Xk], then T0 is not * a subtype of T1. Test generic types * @author sgrekhov@unipro.ru */ /** * @description Check that if type T0 not a subtype of a type T1, then instance * of T0 cannot be be used as a return value of type T1. Return value is tested. * @compile-error * @author sgrekhov@unipro.ru * @author ngl@unipro.ru */ /* * This test is generated from named_function_types_fail_A33.dart and * return_value_fail_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 A {} class C extends A {} class U {} class B0 {} class B1 {} class V0 {} class V1 {} class V2 {} class V3 {} class V4 {} typedef T0 = U, int> Function( V0 x0, V1 x1, {V2? x2, V3? x3, V4? x4}); // V2, int> is not a subtype of V2 typedef T1 = U Function( V0, int> y0, V1, int> y1, {V2, int>? x2, V3, int>? x3}); U, int> t0Func( V0 x0, V1 x1, {V2? x2, V3? x3, V4? x4}) => new U, int>(); U t1Func( V0, int> y0, V1, int> y1, {V2, int>? x2, V3, int>? x3}) => new U(); T0 t0Instance = t0Func; T1 t1Instance = t1Func; const t1Default = t1Func; T1 returnValueFunc() => t0Instance; //# 01: compile-time error class ReturnValueTest { static T1 staticTestMethod() => t0Instance; //# 03: compile-time error T1 testMethod() => t0Instance; //# 04: compile-time error T1 get testGetter => t0Instance; //# 05: compile-time error } main() { returnValueFunc(); //# 01: compile-time error T1 returnValueLocalFunc() => t0Instance; //# 02: compile-time error returnValueLocalFunc(); //# 02: compile-time error ReturnValueTest.staticTestMethod(); //# 03: compile-time error new ReturnValueTest().testMethod(); //# 04: compile-time error new ReturnValueTest().testGetter; //# 05: compile-time error }