Unexpected Error: #<SB-INT:BUG "~@<failed AVER: ~2I~_~A~:>" {1002E81E41}> failed AVER: NSLOTDS
I've found source of this error -- SBCL's internal %UPDATE-CLASS assumes that slot-allocation is either :instance or :class (and we have :database for persistent slots), so it breaks when you drop a virtual slot (i.e. redefine class without this slot).
It is trivial to fix this particular problem, but I'm not sure that rest of %UPDATE-CLASS code is correct.
So I didn't submit a patch: it would be better if SBCL developers review %UPDATE-CLASS and related code assuming that some slots might be "virtual". I just don't understand SBCL internals very well.
You can probably ignore this bug and use latest version of SBCL anyway if you abstain from redefining classes with dropped slots :)
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