[Bug libgdiagnostics/119837] Off-by-one truncation in a warning message from gfortran with quoted string

[schwab--- via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119837

--- Comment #8 from Andreas Schwab <sch...@linux-m68k.org> ---
Probably an interaction with the xn glitch.