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    It's worthless.  That is to say, there are programs that use it but it doesn't
    make sense to have a macro for every possible program that uses unwind-protect,
    it's not like it's hard to write it yourself.  We have with-open-file
    because it's so common and to try and stop naive users from forgetting to
    close their files.
Yeah; that is what I thought too.  I just wanted to get another opinion
before deciding to leave it out.  We must remember to make the documentation
clear enough about how to write your own unwind-protect handler so that
people will do it right.  Probably the manual should show the complete
expansion of with-open-file.