Function arg_error 

pub fn arg_error(
    state: &mut LuaState,
    arg: i32,
    extramsg: &[u8],
) -> Result<usize, LuaError>

Push an error for argument arg with extra message extramsg. Attempts to enrich the message with the calling function’s name. Always returns Err.

C: LUALIB_API int luaL_argerror(lua_State *L, int arg, const char *extramsg)