patch 7.4.2072
Problem:    substitute() does not support a Funcref argument.
Solution:   Support a Funcref like it supports  a string starting with "\=".
diff --git a/src/version.c b/src/version.c
index 5cb7897..a7b65c8 100644
--- a/src/version.c
+++ b/src/version.c
@@ -759,6 +759,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2072,
+/**/
     2071,
 /**/
     2070,