[Bug c/95057] missing -Wunused-but-set-variable warning on multiple assignments, not all of them used

[vincent-gcc at vinc17 dot net via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95057

--- Comment #6 from Vincent Lefèvre <vincent-gcc at vinc17 dot net> ---
Well, for the ++, --, +=, -=, *=, etc. operators, that's PR44677 (though it is
unclear on what it should cover).