(defcfun ("render" c-render) :void
  (point (:struct point))
  (width :int)
  (height :int)
  (info :string)
  (world :pointer))

(c-render point width height "FOO" (world-c world))

There is no applicable method for the generic function
  #<STANDARD-GENERIC-FUNCTION
    CFFI:TRANSLATE-INTO-FOREIGN-MEMORY (5)>
when called with arguments
  (#.(SB-SYS:INT-SAP #X7FFFF4507EF8)
   #<CFFI::FOREIGN-STRING-TYPE :UTF-8>
   #.(SB-SYS:INT-SAP #X7FFFF4507ED0)).
   [Condition of type SIMPLE-ERROR]