[arp242]

Most if not all of bash.

zlib changed it just a few months ago (1.3 release from August): https://github.com/madler/zlib/issues/633

I've also seen it in some FreeBSD code, but that was quite a few years ago and I don't know to what degree that's been cleaned up – not so easy to grep for, but a quick check in git log shows e.g. https://github.com/freebsd/freebsd-src/commit/e5d0d1c5fbbc and some other things, so it seems there's still some K&R around.

Probably others as well, this is what I happen to know from the top of my head.