patch 8.2.0189: cd() with NULL argument crashes Commit: https://github.com/vim/vim/commit/7cc96923c44bbcc541cbd211b6308d87a965f0c3 Author: Bram Moolenaar <Bram@vim.org> Date: Fri Jan 31 22:41:38 2020 +0100 patch 8.2.0189: cd() with NULL argument crashes Problem: cd() with NULL argument crashes. Solution: Check for NULL. (Ken Takata, closes https://github.com/vim/vim/issues/5558)

/* vim9execute.c */
int call_def_function(ufunc_T *ufunc, int argc, typval_T *argv, typval_T *rettv);
void ex_disassemble(exarg_T *eap);
int tv2bool(typval_T *tv);
int check_not_string(typval_T *tv);
/* vim: set ft=c : */