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From: prj@po.cwru.edu (Paul Jarc)
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Subject: Re: (concat "/dir/name/" "foo") --> (expand-file-name "foo" "/dir/name/")
Date: 22 Oct 2000 20:45:01 -0400
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Kai.Grossjohann@CS.Uni-Dortmund.DE (Kai Gro=DFjohann) writes:
> I have tried hard to come up with a reason why expand-file-name could
> fail to be idempotent, but I can't come up with a reason.

A mischevious, badly-written, or maybe just an unconventional handler
might give an expanded name that would, when re-expanded, give a
different name.  But this probably doesn't happen in most normal
situations.

> But in any case, using concat to create a file name from a directory
> and a relative path name is not a good thing, I think.

Why not?


paul