page.vala:90.5-90.39: error: Property `Page.scan_direction' with custom `get' accessor and/or `set' mutator cannot have `default' value

simple-scan.vala:130.30-130.41: error: Argument 1: Cannot convert from `unowned GLib.List<weak ScanDevice>' to `unowned GLib.List<ScanDevice>'
        ui.set_scan_devices (devices_copy, missing_driver);
                             ^^^^^^^^^^^^

I think both are actual upstream problems.