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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 B0i[Z0/X0, ..., Zk/Xk] !== B1i[Z0/Y0, ..., Zk/Yk] /// for any i in 0...k, then T0 is not a subtype of T1. Test generic types /// @author sgrekhov@unipro.ru 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}); typedef T1 = U Function( // Y extends B0, not B1 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; //# @T0 = T0 //# @T1 = T1 //# @GenericFunctionType