Wrapper to indicate a C local variable assignment in an mv-let that side-effects 4 additional variables.
See atc-let-designations.
Macro: assign4
(defmacro assign4 (x) (cons 'mv-let (cons '(*0 *1 *2 *3 *4) (cons x '((mv (assign *0) *1 *2 *3 *4))))))
