[sjamaan]

This is an old example. This should now be something like

(import (chicken format)) (define (test number1 number2) (printf "Sum: ~s" (+ number1 number2))) (test 1 2)

If you're trying to actually use srfi-1, that's now imported via (import srfi-1). (use...) no longer exists.

[gus_massa]

You can use two spaces at the beginning of the line to get code mode:

  ;(use srfi-1)                ; <-- old
  (import (chicken format))    ; <-- new 
  (define (test number1 number2)
    (printf "Sum: ~s" (+ number1 number2)))
  (test 1 2)

[RaycatRakittra]

Gotcha! Thanks for the update.