I tried your example with highlight 2.7 and highlight 2.9 (not yet in Debian) and it seems ok. Not very flashy highlighting, but it does seem to treat ' as part of the identifier. Would you mind checking with one of those versions?
All the best, David -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org