[MLton] Problem with MinGW

[Matthew Fluet]

> things, but I can't see what happened earlier... gdb fails to debug the 
> assembler section, and the c-codegen doesn't compile on MinGW.

Why doesn't the c-codegen work on MinGW?

> Any suggestions about how I could debug this? A switch to the effect of 
> 'print all FFI calls to stderr' would be very helpful. The only thing I can 
> think of at the moment is to try to fix the c-codegen so that I can use gdb.

That would be a good thing to do anyways.