set-car
builtin-function
(set-car list item)
Assigns item to the first item of list.
make-html > (let z '(111 2 3))
it: z
make-html > (set-car z 111)
it: 111
make-html > z
it: (111 2 3)
make-html > (macroexpand '(setf (car z) 111))
it: (set-car z 111)