<html> <head> <style></style> </head> <body class='hmmessage'> Hi! I am trying to learn syntax-rules macros but have some very basic questions regarding manipulation of s-expressions. Below is some simple code to illustrate my questions: #lang scheme (define-syntax foo   (syntax-rules ()     ((_ (x y))      #t))) (define sexpr '(a b)) ;; one (foo sexpr) ;; two (foo '(a b)) ;; three (foo (a b)) ;; four (eval `(foo ,sexpr)) So I understand why the first example fails. I am not sure why example two matches as I would only assume example three would. I understand why example four works but is there anyway I can do this without eval? TIA. <hr />Got a cool Hotmail story? <a href='http://clk.atdmt.com/UKM/go/195013117/direct/01/' target='_new'>Tell us now</a></body> </html>