[MLton] MLton.TextIO.mkstemps

[Matthew Fluet]

> The bad news: This still doesn't explain my original posting, where the 
> contention was on '/tmp/file6snPhX.15.c'.  The .c files that arise during a 
> compilation are only opened for reading by gcc.  Now, mlton does open the .c 
> file for writing twice: once via open with O_WRONLY | O_CREAT | O_EXCL to 
> grab the filename and then once via open with O_WRONLY | O_CREAT | O_TRUNC to 
> write the contents, but we never unlink it until after the call to the linker 
> returns and we're cleaning up all intermediate files.

BTW, the Apple file system is case-insensitive (but case-preserving).  I 
can't extrapolate from that to an explaination, since open with O_WRONLY | 
O_CREAT | O_EXCL properly returns "file exists" when called with a file 
name that differs only in case to an existing file.  But, I thought I 
would pass it along.