pub unsafe extern "C" fn g_sequence_search(
    seq: *mut *mut _GSequence,
    data: *mut c_void,
    cmp_func: Option<unsafe extern "C" fn(_: *const c_void, _: *const c_void, _: *mut c_void) -> i32>,
    cmp_data: *mut c_void
) -> *mut *mut _GSequenceIter