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On 3/19/13, David A. Wheeler <dwheeler@xxxxxxxxxxxx> wrote: > Alan Manuel Gloria: >> There's a subtle problem with ". $" though... >> >> First: >> >> a $ b >> ===> >> (a b) ; as described in the rationale for SUBLIST. >> >> Then: >> >> a . $ b >> ===> >> (a . b) >> >> ??? > > Bug, and I think fixed. Current development version of > "unsweeten" and the ANTLR implementation seem to work. > The Scheme implementation now does this: > > $ printf 'a . $ b\n\n' | ./unsweeten > (a b) > > > Supporting ". $" does have a slight annoyance; it creates a minor > ambiguity in the grammar (basically, like a "dangling else" clause in many > langauges). > I've been able to avoid those so far. It's not a crisis, because we can > easily make it go first, but it is an annoyance. Err mostly I was pointing out that this is actually an inconsistency - SUBLIST normally does not wrap a single datum after it in an extra layer of parens, while "." essentially removes an extra layer of parens. So maybe ". $" notation isn't as good as I thought. Sincerely, AmkG