What approaches can you use when:
You should either, just not commit the code, or better yet, commit it to a development branch so that it is at least off your machine in case of catastrophic failure of your box.
This is what I do at work with my git repo. I push my work at the end of the day to a remote repo (not the master branch). My coworker is aware that these branches are super duper unstable and not to be touched with a ten foot pole unless he really likes to have broken branches.
Git is super handy for this situation as is, I imagine, other dvcs with cheap branching. Doing this in SVN or worse yet CVS would mean pain and suffering.