commit https://github.com/vim/vim/commit/437bafe4c8a83ed71ee006eda7f54b65a90f0d4c Author: Bram Moolenaar <Bram@vim.org> Date: Mon Aug 1 15:40:54 2016 +0200 patch 7.4.2137 Problem: Using function() with a name will find another function when it is redefined. Solution: Add funcref(). Refer to lambda using a partial. Fix several reference counting issues.

--- a/src/vim.h
+++ b/src/vim.h
@@ -2475,6 +2475,7 @@ int vim_main2(int argc, char **argv);
 #define ERROR_DICT	4
 #define ERROR_NONE	5
 #define ERROR_OTHER	6
+#define ERROR_DELETED	7
 
 /* flags for find_name_end() */
 #define FNE_INCL_BR	1	/* include [] in name */