subr-arity

subr-arity is a built-in function in `C source code'.

(subr-arity SUBR)

Return minimum and maximum number of args allowed for SUBR.
SUBR must be a built-in function.
The returned value is a pair (MIN . MAX). MIN is the minimum number
of args. MAX is the maximum number or the symbol `many', for a
function with `&rest' args, or `unevalled' for a special form.