patch 8.1.1863: confusing error when using a builtin function as method commit https://github.com/vim/vim/commit/9174639a82799011cfa0013cbc4c4709b3833bf0 Author: Bram Moolenaar <Bram@vim.org> Date: Fri Aug 16 22:22:31 2019 +0200 patch 8.1.1863: confusing error when using a builtin function as method Problem: Confusing error when using a builtin function as method while it does not support that. Solution: Add a specific error message.

--- a/src/vim.h
+++ b/src/vim.h
@@ -2518,6 +2518,7 @@ typedef enum {
 #define ERROR_NONE	5
 #define ERROR_OTHER	6
 #define ERROR_DELETED	7
+#define ERROR_NOTMETHOD	8   // function cannot be used as a method
 
 /* flags for find_name_end() */
 #define FNE_INCL_BR	1	/* include [] in name */