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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 high-level types and the case when /// p > n and m = q. /// @author sgrekhov@unipro.ru 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 S4 extends V4 {} class X0 extends B0 {} class X1 extends B1 {} class Y0 extends B0 {} class Y1 extends B1 {} typedef T0 = U0, int> Function( V0 x0, V1 x1, [V2? x2, V3? x3]); typedef T1 = U1 Function( S0, int> y0, S1, int> y1, S2, int> x2, [S3, int>? x3]); U0, int> t0Func( V0 x0, V1 x1, [V2? x2, V3? x3]) => new U0, int>(); U1 t1Func( S0, int> y0, S1, int> y1, S2, int> x2, [S3, int>? x3]) => new U1(); T0 t0Instance = t0Func; T1 t1Instance = t1Func; const t1Default = t1Func; //# @T0 = T0 //# @T1 = T1 //# @GenericFunctionType