[MLton] C-- backend

[Daniel Harvey]

I was recently told that a C-- backend for MLton exists, but the newest
information I could find was from ~March of 2005. Targetting C-- would be
pretty handy for us, because some of the optimizations involve weak
continuations. However, the last thing I read on the backend said that it
still hasn't implemented callcc (among other features), so that might make
things more difficult. I wanted to know what the current state of the C--
backend is, and if/where we could get the source code.