which is cited as having 6 characters. My problem is that when using SBCL and emacs-slime. Doing a macro expansion
C-x C-m leads to
(BLOCK NIL (TAGBODY #:G890 (PROGN) (GO #:G890)))
Which is significantly more than 6 characters. Now the question arises how to count characters in this case. If one allows macros as a valid tool (as loop in SBCL seems to be implemented as a macro) anyone could come up with another macro shortening the loop to 3 characters (or maybe even less).
One might argue that
loop is part of SBCL implementation thus no extra macro is required. But it still feels like cheating using a macro based solution as the 'really' used amount of characters is different.