[r6rs-discuss] [Formal] please make square brackets more useful

[AndrevanTonder]

On Tue, 19 Jun 2007, William D Clinger wrote, quoting Jonathan Reese:

> Define
> [a b c] to be a special reader syntax for the four-element list
> (*square-bracketed* a b c)

Let me just point out that, unless done very carefully, this may cause
very puzzling ambiguities.  For example, if COND is naively written to allow 
either square or round brackets, the meaning of the expression

   (cond [#f])

would depend on the order in which the COND macro matches for square/round 
brackets.

Andre