[Bug c++/91155] __PRETTY_FUNCTION__ gets truncated when char template parameter is '\0'

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91155

--- Comment #16 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 64636
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=64636&action=edit
gcc17-pr91155.patch

Untested fix.