patch 7.4.1580
Problem:    Crash when using function reference. (Luchr)
Solution:   Set initial refcount. (Ken Takata, closes #690)
diff --git a/src/version.c b/src/version.c
index e4c3412..cb29158 100644
--- a/src/version.c
+++ b/src/version.c
@@ -749,6 +749,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1580,
+/**/
     1579,
 /**/
     1578,