how useful are collecting lists?
David Vanderson
(12 Mar 2013 04:32 UTC)
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(missing)
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Re: how useful are collecting lists?
David Vanderson
(13 Mar 2013 01:59 UTC)
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Re: how useful are collecting lists?
David A. Wheeler
(13 Mar 2013 02:51 UTC)
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Re: how useful are collecting lists?
Alan Manuel Gloria
(13 Mar 2013 06:54 UTC)
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Re: how useful are collecting lists? David A. Wheeler (13 Mar 2013 23:36 UTC)
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Re: how useful are collecting lists?
Alan Manuel Gloria
(14 Mar 2013 00:48 UTC)
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Re: how useful are collecting lists?
David A. Wheeler
(13 Mar 2013 23:57 UTC)
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Re: how useful are collecting lists?
David Vanderson
(14 Mar 2013 01:15 UTC)
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Re: how useful are collecting lists? David A. Wheeler 13 Mar 2013 23:36 UTC
I said: > > Hmm. If that's a *problem*, one solution without significantly changing > > the existing semantics might be to allow <*...*> after ".". Alan Manuel Gloria <xxxxxx@gmail.com> wrote: > Ara ara, I thought this was *already* allowed... Actually, they weren't. I was trying to be picky about what's allowed after "." (e.g., I don't think "$" and "\\" are sensible), and obviously was *too* picky. You're absolutely right, that should be permitted. So this is an important tip, we need to allow this case. I've changed the BNF and Scheme implementation so that a collecting list is legal after the dot in "rest". Thus, this is now legal: define x . <* ! define y 5 ! define z 6 *> I haven't modified "head", so if "." is the first atom on a line, a collecting list currently can't follow. I can't figure out why you'd want to do that, I'd expect a user to just use a collecting list in that case. So we already have an important comment (from David Vanderson) that's pointed out a problem, and I've posted a possible solution (one that I hope others will agree is sensible). Excellent! Seems to me that's why we have a SRFI process... --- David A. Wheeler