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Hobittable but nonexecutable code

The following simple program:

(define-module (std io))
(define-public  println println) ; because of non-hobbitability of
                                 ; (define-public (sum . args) (apply +
args))

(define (println . args)
 (for-each display args)   ;;;; this line produces the error
 (newline)
 (force-output)
)

(display "ready\n")

Compiles without warning but when executed produces the following error
message:

> a.out
ERROR: In procedure apply:
ERROR: Wrong type argument in position 1: %S

Any Help? Thanks, Alex