If ModA is Car and ModB is CarEngine then I understand that the Car wants to import CarEngine because Car HasA CarEngine, I don't see why would CarEngine import Car. Even if it later keeps a IsIn reference.
The concept makes about as much sense as multiple inheritance. It looked like a good idea at first, but it causes too many subtle and hard to debug problems. Which is why things like mixins were invented. Though of course it means a bit of refactoring, instead of merging two classes and hoping for the best.
Jenda
Enoch was right!
Enjoy the last years of Rome.
