https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96935
--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Guess the error is simply that we fall back to no columns and thus start.column
== 0 and we do
char_span literal = line.subspan (start.column - 1, literal_length);
which means input.c:1467 should check whether start.column is >= 1
Might also trigger with
printf ("\
......")
who knows.
Your backtrace doesn't contain function argument values to verify. Maybe you
can
build GCC with -O0 once and check?
