Function gtk_sys::gtk_text_buffer_register_serialize_format

pub unsafe extern "C" fn gtk_text_buffer_register_serialize_format(
    buffer: *mut GtkTextBuffer,
    mime_type: *const c_char,
    function: GtkTextBufferSerializeFunc,
    user_data: gpointer,
    user_data_destroy: GDestroyNotify
) -> GdkAtom