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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 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}) => new U0(); U1 t1Func(S0 y0, S1 y1, {S2? x2, S3? x3}) => new U1(); T0 t0Instance = t0Func; T1 t1Instance = t1Func; const t1Default = t1Func; //# @T0 = T0 //# @T1 = T1