I'm a little surprised to see 'afnwith. Anarki also has aw's 'xloop, which is the exact same thing as 'afnwith but with the "self" anaphoric variable renamed to "next".
In wart the name can be nicer still -- just loop since for does what arc's loop does, in the footsteps of classical C.
Edit 20 minutes later: I ended up going with recur instead of next, to form a loop.. recur pair. I also considered with loop.. recur to strengthen the connection with with for the alternating var/val syntax. (The other pair of keywords in wart is collect.. yield in place of accum acc.) https://github.com/akkartik/wart/commit/b7b822f4fb has has an example use, which had me hankering for absz's w/afn (though with a better name; http://arclanguage.org/item?id=10125)
Edit 25 minutes later: It turns out xloop nests surprisingly cleanly. This does what you expect:
loop (a 0)
loop (b 0)
prn a " " b
if (b < 5) (recur ++b)
if (a < 5) (recur ++a)
Edit 29 minutes later: Oh, loop.. recur is precisely what clojure uses!
