WITH-TEMPORARY-FILE gives warnings when pathname variable is not used
I had some code with
with-temporary-file that did not use its
pathname variable in the block after
:close-stream. Specifically, I had code in the block before that took the
namestring of the pathname and used that in the suffix.
This caused an "unused variable" warning to be raised.
This can be fixed by declaring the pathname variable to be
ignorable in the suffix (the "after function").