https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110524
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Summary|Internal compiler error: |[C++20] ICE with use of
|../csu/libc-start.c:392 |function template name with
| |no prior declaration in
| |decltype
Ever confirmed|0 |1
Last reconfirmed| |2023-07-03
Known to fail| |14.0, 9.5.0
--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Confirmed, fully reduced testcase:
```
template <typename... Ts> struct tuple {};
template <int... Ts> struct seq {};
template <typename TT, typename... Ts, int... i>
inline auto sfinae_friendly_apply_impl(TT invocable, tuple<Ts...> t,
seq<i...>) noexcept
-> decltype(invocable(get<i>(t)...)) {}
void run_all() {
sfinae_friendly_apply_impl([](){}, tuple<>{}, seq<>{});
}
template<int i, typename T> int get(T);
```
Note moving the definition of get before the definition of
sfinae_friendly_apply_impl allows GCC to work.
