Function gio_2_0_sys::g_async_initable_new_async

pub unsafe extern "C" fn g_async_initable_new_async(
    object_type: GType, 
    io_priority: gint, 
    cancellable: *mut GCancellable, 
    callback: Option<GAsyncReadyCallback>, 
    user_data: gpointer, 
    first_property_name: *const gchar,
     ...
)