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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