> Recently I learned about the variable temp-file-name-pattern when
> under odd circumstances I didn't have access to /tmp. I was
> surprised that the default value of this variable was
> /tmp/emacsXXXXXX, thus ignoring my setting of
> temporary-file-directory. Shouldn't temp-file-name-pattern take into
> account the value of temporary-file-directory?
It looks like temp-file-name-pattern is specific to call-process-region,
and predates temporary-file-directory. call-process-region indeed
should be updated to use either make-temp-file or at least
temporary-file-directory. And temp-file-name-pattern should be dropped.