patch 8.2.2846: Vim9: "echo Func()" does not give an error for using void Commit: https://github.com/vim/vim/commit/68db996b621b98066fb7ab7028ed5c6aaa3954a8 Author: Bram Moolenaar <Bram@vim.org> Date: Sun May 9 23:19:22 2021 +0200 patch 8.2.2846: Vim9: "echo Func()" does not give an error for using void Problem: Vim9: "echo Func()" does not give an error for a function without a return value. Solution: Give an error. Be more specific about why a value is invalid.

/* session.c */
void ex_loadview(exarg_T *eap);
int write_session_file(char_u *filename);
void ex_mkrc(exarg_T *eap);
var_flavour_T var_flavour(char_u *varname);
int put_eol(FILE *fd);
int put_line(FILE *fd, char *s);
/* vim: set ft=c : */