We can now state a few built-in LISP functions and special forms. We do not describe the results obtained when “illegal” input of various kinds is evaluated. Such behavior varies according to the implementation of the LISP interpreter. Following is a list of special forms and functions in LISP:
SETQ: special form with a side-effect
v[(SETQ x y )] = v[x], after v[x] is made equal to v[y] as an initial side-effect. x must be an ordinary atom, necessarily with a nonnumeric name. The type of the value of x is changed to be the type of v[y], with a special modification ...
