https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102873
Bug ID: 102873
Summary: GCC incorrectly expected parameter pack before '...'
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: hewillk at gmail dot com
Target Milestone: ---
#include <tuple>
#include <variant>
template<std::size_t>
using int_t = int;
template<std::size_t N>
using tuple_t = decltype([]<std::size_t... Is>(std::index_sequence<Is...>) {
return std::tuple<int_t<Is>...>{};
}(std::make_index_sequence<N>{}));
template<std::size_t N>
using variant_t = decltype([]<std::size_t... Is>(std::index_sequence<Is...>) {
return std::variant<tuple_t<Is>...>{};
}(std::make_index_sequence<N>{}));
using T = variant_t<6>;
https://godbolt.org/z/ov95G1aj1
