https://gcc.gnu.org/bugzilla/show_bug.cgi?id=72842
--- Comment #2 from Barry Revzin <barry.revzin at gmail dot com> ---
This non-dependent version:
template <void...> void bar() { }
fails to compile, even if we never call bar(), even if we wanted to call it
with an empty pack.
foo<void> in the original example is this same thing with an extra template
type parameter. Why the difference?
