http://t3x.org/mcl/special.html (light|dark)
The core of the MICRO COMMON LISP system has the following special forms. The rest of the system is bootstrapped in LISP.
FSETQ IF LAMBDA QUOTE FUNCTION IFNOT PROGN SETQ
Most of these are Common LISP special operators, except for
FSETQ (store values in function bindings),
(IFNOT X Y), which is basically (IF X X Y),
but without duplicating any effects of X.