https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91309
--- Comment #1 from beachboy44 at me dot com ---
Possibly related cases that also fail to compile:
template<typename T>
using F = decltype([]{ return T{0}; });
auto g = [](auto x) {
using G = F<decltype(x)>;
return G{}();
};
https://godbolt.org/z/tSwWUF
auto f = []{ return 0; };
template<typename>
using F = decltype(f);
auto g = [](auto x) {
using G = F<decltype(x)>;
return G{}();
};
https://godbolt.org/z/w20oxP
