https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111031
Bug ID: 111031 Summary: ICE: internal compiler error: in iterative_hash_template_arg, at cp/pt.cc:1747 Product: gcc Version: 14.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: hewillk at gmail dot com Target Milestone: --- I will reduce it if I have the bandwidth. #include <ranges> namespace std::ranges { template<class... Rs> using concat_reference_t = common_reference_t<range_reference_t<Rs>...>; template<class... Rs> concept concatable = (requires(const iterator_t<Rs> in) { { *in } -> convertible_to<concat_reference_t<Rs...>>; } && ...); template<class... Views> requires concatable<Views...> class concat_view { }; template<class... Rs> concat_view(Rs&&...) -> concat_view<views::all_t<Rs>...>; } // namespace std::ranges int main() { int x[] = {0, 1, 2}; std::ranges::concat_view r(x); } https://godbolt.org/z/jEh9YzafT