commit https://github.com/vim/vim/commit/c8dcbb12c5d7f3eb0c334daebb4475bb015b91e7 Author: Bram Moolenaar <Bram@vim.org> Date: Thu Feb 25 23:10:17 2016 +0100 patch 7.4.1421 Problem: May free a channel when a callback may need to be invoked. Solution: Keep the channel when refcount is zero.

--- a/src/version.c
+++ b/src/version.c
@@ -749,6 +749,8 @@ static char *(features[]) =
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1421,
+/**/
     1420,
 /**/
     1419,