CL-USER 14 > (loop for i from 0 below 10
sum i into isum
when (evenp i) sum i into evensum of-type integer
else when (oddp i) sum i into oddsum
finally (return (* isum evensum oddsum)))
(1 * 2 ^ 3 + 1) is a valid s-expression, but not a valid Lisp program. With an INFIX macro it could be:
(infix 1 * 2 ^ 3 + 1) could be a valid Lisp program, with a corresponding infix macro.
But the Lisp syntax still is on top of the s-expression syntax...