doc: Fix initial sleeper.

* doc/8sync.texi (Writing our own actors): Add missing slot to initial
sleeper example.

diff --git a/doc/8sync.texi b/doc/8sync.texi
index 67eba86d284a1b1fdb855300ae826e4bf9c565d1..7412ea1e75942a11cdf532ddaa51f8a221830a95 100644 (file)
--- a/doc/8sync.texi
+++ b/doc/8sync.texi
@@ -441,7 +441,8 @@ How about an actor that start sleeping, and keeps sleeping?
 (define-class <sleeper> (<actor>)
   (actions #:allocation #:each-subclass
            #:init-thunk (build-actions
-                         (*init* sleeper-loop))))
+                         (*init* sleeper-loop)))
+  (sleep-secs #:init-value 1 #:getter sleeper-sleep-secs))
 
 (define (sleeper-loop actor message)
   (while (actor-alive? actor)