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The issue of how to get back more information about what is wrong
with a file was where we got bogged down before. I think that error
systems are the called for when you start to consider that sort of
issue. Any enumeration of all the things that can go wrong with
writing a file will also probably be hopelessly implementation
dependent. Unless you can come up with a simple, highly esthetic
proposal, I think we should stick with NIL for failure.
I suppose we could return an error-message string as a second
value, but anything along those lines seems like a sort of half-way
measure to me.