patch 7.4.1380
Problem:    The job exit callback is not implemented.
Solution:   Add the "exit-cb" option.
diff --git a/src/misc2.c b/src/misc2.c
index 932d67e..7665d29 100644
--- a/src/misc2.c
+++ b/src/misc2.c
@@ -6256,5 +6256,9 @@
     /* Process the queued clientserver messages. */
     server_parse_messages();
 # endif
+# ifdef FEAT_JOB
+    /* Check if any jobs have ended. */
+    job_check_ended();
+# endif
 }
 #endif