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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 * @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_A31.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. */ 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 {} 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 x2, S3 x3}); // S2 is not subtype of V1 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; //# 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 }