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The following URL purports to be the R5RS and it supports set!.


on 11/11/04 1:04 PM, Dr. Rich Artym at wrote:

> Admittedly it used to be legal in older versions of Scheme (up to 5c4),
> and then Scheme r4rs referred to it as a "compatible extension but not
> a compliant implementation" of Scheme (lol, Scheme had a lot of politics
> in those days).  And finally they bit the bullet and simply made it
> illegal Scheme starting from r5rs.  Scheme's always tried to move in
> the direction of lambda calculus purity.