patch 7.4.1844
Problem:    Using old function name in comment.  More functions should start
            with test_.
Solution:   Rename function in comment. (Higashi Higashi) Rename
            disable_char_avail_for_testing() to test_disable_char_avail().
            And alloc_fail() to test_alloc_fail().
diff --git a/src/version.c b/src/version.c
index 678bf2a..8de1279 100644
--- a/src/version.c
+++ b/src/version.c
@@ -754,6 +754,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1844,
+/**/
     1843,
 /**/
     1842,