[Bug c++/69009] ICE in instantiate_decl, at cp/pt.c:21511

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69009

--- Comment #2 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
Dropping "volatile" here "solves" the issue:
 template <class T> auto const tuple_size_v<T const volatile> =
tuple_size_v<T>;