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David A. Wheeler scripsit:
> > In particular, the abbreviations #', #`, #, and #,@
> > are widely used by the syntax-case macro system.
>
> A fair point. I didn't include them as requirements because
> R7RS drafts (currently draft 9) don't include them, but
> some sort of discussion does seem appropriate.
They ought to be included. Not only does R6RS require them, but many
non-R6RS Schemes also provide syntax-case, often in the form of the
portable syntax expander. However, Gauche, Chicken, STklos, and RScheme
provide SRFI-10, which conflicts with the syntax-case meaning of #,.
None of my other Schemes have any conflicts: they either implement
syntax-case or treat #, as an error.
> Perhaps something like "An implementation MAY support
> additional abbreviations, such as ..." and then listing those four.
Plausible.
--
De plichten van een docent zijn divers, John Cowan
die van het gehoor ook. cowan@xxxxxxxx
--Edsger Dijkstra http://www.ccil.org/~cowan