commit https://github.com/vim/vim/commit/779f2fc3a7468e273897d2fd0672315812a2e3da Author: Bram Moolenaar <Bram@vim.org> Date: Thu Sep 1 20:58:24 2016 +0200 patch 7.4.2303 Problem: When using "is" the mode isn't always updated. Solution: Redraw the command line. (Christian Brabandt)

/* 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);