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++ Diagnose lack of default ctor if object used in relationship
+
+ Got two questions on the mailing list about that in one week. Maybe
+ always diagnose lack of public ctor? Maybe with a warning if no
+ relationship? The no_ctor pragma like no_id?
+
+ For now only diagnose (error) for pointed-to objects since that
+ will lead to uncompilable generated code (as opposed to user
+ code). Another option would be to add an option to warn about
+ the lack of default ctor in all persistent classes. \ No newline at end of file