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On 03/13/2013 04:36 PM, David A. Wheeler wrote:
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.
My plan was to replace "<* begin" with ". <*" in the example, so this: define-library example grid export make rows cols ref each rename(put! set!) import scheme(base) <* begin ;stuff *> becomes (in a scheme with implicit begin): define-library example grid export make rows cols ref each rename(put! set!) import scheme(base) . <* ;stuff *> Does this run against your current "head" rule?
Definitely working out well for me so far. I'm only sorry that I didn't hear about it earlier - my first notice came from your post to the Racket dev list a week or so ago.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