[plt-scheme] eval & syntax-rules

Hi,
Why something like this works :
#lang scheme(define t 9)(let ([t 2])    (eval t (make-base-namespace)))-> 2
but not something like this :
#lang scheme
(define a 4)(define b 5)(define c 6)
(define-syntax test  (syntax-rules ()    [(test id ...)     (eval '(id ...) (make-base-namespace))]))
(test a b c)->  reference to a unidentified identifier : a  
Thanks. 		 	   		  
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