[Bug libstdc++/85965] [8/9/10 Regression] G++ gives cryptic error instead of incomplete type

[hedayat.fwd at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85965

--- Comment #15 from Hedayat Vatankhah <hedayat.fwd at gmail dot com> ---
Thanks!

Yep, I'm certainly not a C++ standard expert.