+ (with-out-stream stream
+ ;; FIXME: CMU CL had
+ ;; (stream-write-byte integer)
+ ;; which was broken unless Gray streams were installed.
+ ;; In order to make this work again, MNA replaced it with
+ ;; bare (LISP-STREAM-BOUT). Something more complicated will
+ ;; probably be required when Gray stream support is restored,
+ ;; in order to make those work too; but I dunno what it will be.
+ (lisp-stream-bout integer)))