My vim using co-workers enjoy a useful feature that I haven't yet found in emacs. A common thing to do to comment out large sections of C or C++ code is to put an #if 0, #endif pair around them. Vim seems to know to change the code highlighting for those regions. Emacs does not. I searched google and came across this suggestion to use hideif.el, which kinda works, but I'm not satisfied. It doesn't automatically change the color of the text like commenting it out does, you have to run the hide-ifdefs to get it to change the color, and you have to re-run it if you do any more editing. I want it to work just like other font-locking in emacs, automatically. Does anyone know how to do this?