* - If there's a "generic" or "unknown" error code for unrecoverable
* errors it doesn't make sense to distinguish with specific codes,
* it should be called <NAMESPACE>_<MODULE>_ERROR_FAILED,
- * for example %G_SPAWN_ERROR_FAILED.
+ * for example %G_SPAWN_ERROR_FAILED. In the case of error code
+ * enumerations that may be extended in future releases, you should
+ * generally not handle this error code explicitly, but should
+ * instead treat any unrecognized error code as equivalent to
+ * FAILED.
*
* Summary of rules for use of #GError:
*
* otherwise. In particular, when @error is %NULL, %FALSE will
* be returned.
*
+ * If @domain contains a `FAILED` (or otherwise generic) error code,
+ * you should generally not check for it explicitly, but should
+ * instead treat any not-explicitly-recognized error code as being
+ * equilalent to the `FAILED` code. This way, if the domain is
+ * extended in the future to provide a more specific error code for
+ * a certain case, your code will still work.
+ *
* Returns: whether @error has @domain and @code
*/
gboolean