Undefined STREAM var?

[slyrus]

It looks like stream is undefined here:

(defmethod unread-byte (byte (flexi-input-stream flexi-input-stream))
  "Similar to UNREAD-CHAR in that it `unreads' the last octet from
STREAM.  Note that you can only call UNREAD-BYTE after a corresponding
READ-BYTE."
  (declare #.*standard-optimize-settings*)
  (with-accessors ((last-octet flexi-stream-last-octet)
                   (octet-stack flexi-stream-octet-stack)
                   (position flexi-stream-position))
      flexi-input-stream
    (unless last-octet
      (error 'flexi-stream-error
             :stream stream
             :format-control "No byte to unread from this stream \(or last reading operation read a character)."))
    (unless (= byte last-octet)
      (error 'flexi-stream-error
             :stream stream
             :format-control "Last byte read was different from #x~X."
             :format-arguments (list byte)))
    (setq last-octet nil)
    (decf (the integer position))
    (push byte octet-stack)
    nil))

Should it be flexi-input-stream?

[stassats]

But it is flexi-input-stream for me.