commit https://github.com/vim/vim/commit/707659490d35e8d66e8bbdcfd93b12dc1387d86c Author: Bram Moolenaar <Bram@vim.org> Date: Sun Feb 28 19:28:59 2016 +0100 patch 7.4.1451 Problem: Vim hangs when a channel has a callback but isn't referenced. Solution: Have channel_unref() only return TRUE when the channel was actually freed.

--- a/src/version.c
+++ b/src/version.c
@@ -744,6 +744,8 @@ static char *(features[]) =
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1451,
+/**/
     1450,
 /**/
     1449,