patch 8.1.0066: nasty autocommand causes using freed memory commit https://github.com/vim/vim/commit/c3ffc9b8d3015dc5280b297b4e3deb4f34944bd4 Author: Bram Moolenaar <Bram@vim.org> Date: Sun Jun 17 17:32:58 2018 +0200 patch 8.1.0066: nasty autocommand causes using freed memory Problem: Nasty autocommand causes using freed memory. (Dominique Pelle) Solution: Do not force executing autocommands if the value of 'syntax' or 'filetype' did not change.

/* auto/if_perl.c */
int perl_enabled(int verbose);
void perl_end(void);
void msg_split(char_u *s, int attr);
void perl_win_free(win_T *wp);
void perl_buf_free(buf_T *bp);
void ex_perl(exarg_T *eap);
void do_perleval(char_u *str, typval_T *rettv);
void ex_perldo(exarg_T *eap);