[Bug c++/53132] Missing top level in diagnostic's instantiation stack

[paolo.carlini at oracle dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53132

--- Comment #3 from Paolo Carlini <paolo.carlini at oracle dot com> ---
I guess we need an updated reproducer - ideally not including std headers -
because the original one now is simply accepted.