[bug #30070] multiple returns from map

[Andy Wingo]

Follow-up Comment #2, bug #30070 (project guile):

Stefan, the tail pointer does preserve performance, but it does not preserve
the R6RS invariant about multiple returns.

Szavai is right.  Perhaps we should provide some other definition of `map'
within R6RS to satisfy this requirement.  However, a proper solution looks
more like recursion than iteration, and to do that with arbitrary-sized lists
will require Guile to implement extendable stacks, which is a significant
hack.

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