https://bugzilla.gnome.org/show_bug.cgi?id=719884
* An example of how to us this:
* |[
* /<!-- -->* Make sure we don't do any unnecessary work if already cancelled *<!-- -->/
- * if (g_cancellable_set_error_if_cancelled (cancellable))
+ * if (g_cancellable_set_error_if_cancelled (cancellable, error))
* return;
*
* /<!-- -->* Set up all the data needed to be able to
* bd->cake = cake;
*
* /* Bail out now if the user has already cancelled */
- * if (g_task_return_error_if_cancelled (g_task_get_cancellable (task)))
+ * if (g_task_return_error_if_cancelled (task))
* {
* g_object_unref (task);
* return;