I'd like to perform a specific action just before/after a class is removed from system (from SystemDictionary) - like unregistering the class from a certain list/dictionary of well known classes.
In Visualworks and Squeak/Pharo, I just have to define the message #obsolete at class side.
obsolete
self unregisterSomething.
^super obsolete
Is there an equivalent in Dolphin Smalltalk?