[Bug preprocessor/117125] No error by if it terminating comment only provided

[sjames at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117125

--- Comment #2 from Sam James <sjames at gcc dot gnu.org> ---
Please keep in mind the comment I made wrt screenshots. It's OK if they're
complementary but please try to avoid them by themselves.