Welcome to the CHICKEN Scheme pasting service

(use lolevel)

(define-record foo a b)

(let [(afoo (make-foo 1 1))]
  (print (foo-a afoo))
  
  ((foreign-lambda* void (((c-pointer number) a))
		    "*a=100;")
   (make-locative afoo 1))

  (print "here")
  
  (print (foo-a afoo))
  (print (foo-b afoo))
)

;; Output
;; 1
;; here
;; 1
;; Segmentation fault