client: Implementing abstract interface methods doesn't require override
This caused
(valac:2008734): vala-CRITICAL **: 11:25:16.574: vala_symbol_get_parent_symbol: assertion 'self != NULL' failed
This caused
(valac:2008734): vala-CRITICAL **: 11:25:16.574: vala_symbol_get_parent_symbol: assertion 'self != NULL' failed