Re: %nil once again

[Daniel Kraft <d@domob.eu>]

Neil Jerram wrote:
> Andy Wingo <wingo@pobox.com> writes:
> 
>>> Other things needed would be for instance terminating rest-arguments
>>> by %nil rather than '() and the like.
> 
> Why is that needed?  I.e. Why is it important for a rest argument to
> be terminated with %nil instead of with () ?

Well, I don't think it is "important" at all, but it would be needed for 
"complete elisp" semantics, just because it is a list and lists should 
be terminated by %nil in elisp.  Someone might try to check for the 
end-of-list with (eq tail nil) instead of (null tail) and it should 
still work.

BTW, for an empty rest argument the elisp documentation explicitly 
states it "should" be nil (well, but that's obviously so because nil is 
the empty list).

Daniel

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