Yes but when you do that you loose all the states from "a" (at least the values). You have to do state migration management...

Le 2017-06-07 16:18, Denis Kudriashov a écrit :

2017-06-07 14:53 GMT+02:00 Steven Costiou <steven.costiou@kloum.io>:

I want to do the following:

B adoptInstance: a

It does'nt work, for what i understand it is because the format of the classes are different (B has an inst var and A has not).

Yes, #adopt checks class format. 

Use need to use #become to achieve what you want:

a becomeForward: B new