[MLton] cygwoes

[Matthew Fluet]

> I haven't been following this closely but a quick look at your memory
> management code suggests that if you try the following function you may
> get a better idea of what is causing your problem.
>
> The function just gets the last Windows error and converts that into a
> text message.  Usually those messages are extremely helpful.

This is precisely the code I used to determine that it was error code 487 
with message "Attempt to access invalid address."  That didn't really shed 
much light on the problem.