Tommy as in me?  Just want to make sure you didn't mean me.  I have 0 expectations for how this should work.  I just filed the issue because I came across it accidentally.  It's not something I was actually trying to use.  I was confused about its intent because the help didn't really describe what to expect.  The ./traceur --help just listed "traceur a.js [args]" as an example.  I hit it because I forgot to add a --out to my command line.