[MLton] Parallel compilation?

[Ryan Newton]

I haven't personally come across any multi-threaded compilers that  
parallelize at the granularity of the abstract syntax tree itself  
(not at a module or file granularity).

For whole-program compilers, in the age of the multi-core menace,  
this seems relevant.  I myself work on a whole program compiler that  
uses MLton as one of its backends, and have been trying to  
effectively parallelize it.  I'd be happy to share more about what  
I'm trying to do.  But first I wanted to ask if anyone had any  
pointers to work on multithreading compilers, or if any of the MLton  
developers have considered it.

Thanks,
-Ryan