commit https://github.com/vim/vim/commit/3bece9fee9c02934d3e295b29d253e13d4ef26a7 Author: Bram Moolenaar <Bram@vim.org> Date: Mon Feb 15 20:39:46 2016 +0100 patch 7.4.1322 Problem: Crash when unletting the variable that holds the channel in a callback function. (Christian Robinson) Solution: Increase the reference count while invoking the callback.

/* if_lua.c */
int lua_enabled(int verbose);
void lua_end(void);
void ex_lua(exarg_T *eap);
void ex_luado(exarg_T *eap);
void ex_luafile(exarg_T *eap);
void lua_buffer_free(buf_T *o);
void lua_window_free(win_T *o);
void do_luaeval(char_u *str, typval_T *arg, typval_T *rettv);
int set_ref_in_lua(int copyID);
/* vim: set ft=c : */