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Brian Harvey writes:
> It certainly wouldn't be my ideal choice, because it has multiple return
> values, a blasphemy. ... there are one or two things not in any Scheme
> standard, and not implementable on top of any Scheme standard afaik,
> that I keep missing, e.g., ARITY.
I wonder whether one of the reasons that Scheme standards have
avoided requiring an arity procedure is that the most natural design for it
in classical Scheme would involve returning multiple values -- a natural
number indicating the minimum number of arguments and a Boolean indicating
whether the arity is variable.
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