Marc Nieper-Wißkirchen <xxxxxx@nieper-wisskirchen.de> writes:

> In the current definition of the nest macro, each step has to be of
> the form (<datum> ... _ <datum> ...) and the single underscore is
> replaced by the result of the nesting the later steps.
>
> This is the best one can do if nest is supposed to be implementable
> with syntax-rules (which is, I think, the intent of SRFI 197), but it
> also limits its applicability (and may not always yield what one may
> expect).

This looks to me like another argument for splitting out nest from
SRFI-197 and creating a new SRFI for it. It can still be an
implementation detail, but it seems to strongly increase the effort for
optimal implementation of SRFI-197.

Best wishes,
Arne
--
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