[Bug c++/80962] No more access violation control after certain declarations using concepts

[okannen at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80962

--- Comment #1 from Olivier Kannengieser <okannen at gmail dot com> ---
Inside the comment section BUGGY CODE, the second commented line should be
uncommented to see that gcc does not complaning for private access violation.

The attached file is the version which causes gcc to bug.