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// PR c++/92552 // { dg-do compile { target concepts } } template <typename T> struct basic_mixin { basic_mixin() requires true; }; template <typename Cur> struct mixin : basic_mixin<Cur> { using basic_mixin<Cur>::basic_mixin; }; int main() { (void)__is_constructible(mixin<int>); // noexcept(mixin<int>()); also triggers ICE }