arguments are grouped into additional levels of list structure. Here
is an example:
-@defspec count-loop (@var{var} [@var{from} @var{to} [@var{inc}]]) @var{body}@dots{}
+@defspec count-loop (var [from to [inc]]) body@dots{}
This imaginary special form implements a loop that executes the
@var{body} forms and then increments the variable @var{var} on each
iteration. On the first iteration, the variable has the value