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Oh, it's much worse than that- Link is the superclass of Process. I've done this a few times, porting code from Digitalk applications to VisualWorks. Link is a handy name, but a dangerous one in this case.
Oddly enough, I believe it is possible to add an instance variable to Object in VisualWorks- perhaps this is also possible in Squeak. The problem with redefining Link is that the instance variables and class kind ( variable byte, etc ) probably got changed, hosing the variable bindings in the methods for Process. If the instance variables originally needed for Process still were defined, perhaps you would survive that change.
But of course the real issue is that you wanted to name a NEW class Link, and that is a Modules & Namespaces issue- we do not have either Modules or Namespaces yet.
les
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