Have some more SUBLIST abuse!!!

Note that what I'm talking about, mostly, is: should we consider this
good style or bad style?  If bad, what's a better expression of the
same logic?

; please view using a fixed-width font!
define map1(f as) $ cond
! null?(as) $ '()
! pair?(as) $ cons
!               f $ car as
!               map f $ cdr as
! #t        $ error "attempt to map a non-list"

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