pub fn change_keyboard_mapping<'c, 'input, Conn>(
conn: &'c Conn,
keycode_count: u8,
first_keycode: Keycode,
keysyms_per_keycode: u8,
keysyms: &'input [Keysym],
) -> Result<VoidCookie<'c, Conn>, ConnectionError>where
Conn: RequestConnection + ?Sized,