Am Di., 9. Juni 2020 um 15:25 Uhr schrieb Adam Nelson <xxxxxx@nels.onl>:

> > (6) These macros do not handle procedures returning multiple values;
> > this may not be an issue with Clojure (I don't know), but it should be
> > taken into consideration with Scheme. Especially for pipelining,
> > multiple values can come in handy when more than one value has to be
> > threaded through (or just at some intermediate stages).
> I agree that this should be default functionality; if a procedure
> returns two values, it should expand into two arguments at the front or
> back of the next call in the pipeline. I am concerned about the
> performance impact of this in the default case, though. Schemes without
> sophisticated compilers will be slowed down by making each pipeline call
> a `call-with-values` followed by an `apply` with list concatenation.

When these macros are extended to multiple values, we need a way to
specify more than one initial value. The current syntax only supports
one initial value. I'm not yet sure what the best approach is, but
this issue shouldn't be forgotten.