Function xkbcommon::xkb::ffi::xkb_keymap_key_get_syms_by_level

pub unsafe extern "C" fn xkb_keymap_key_get_syms_by_level(
    keymap: *mut xkb_keymap, 
    key: xkb_keycode_t, 
    layout: xkb_layout_index_t, 
    level: xkb_level_index_t, 
    syms_out: *mut *const xkb_keysym_t
) -> c_int