https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81676
Vittorio Romeo <vittorio.romeo at outlook dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |vittorio.romeo at outlook dot com --- Comment #3 from Vittorio Romeo <vittorio.romeo at outlook dot com> --- Found this today, still present in gcc trunk (9.2+). Example: int main() { auto f = [](auto a, auto b) { if constexpr (sizeof(b) == 1) { return a; } else { return b; } }; return f(1, 1) + f(1, 'a'); } https://gcc.godbolt.org/z/SOvLEV