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Re: Redefinition of print-object

>    The generic function #<GENERIC-FUNCTION PRINT-OBJECT> is being modified, but has already been called.

> I would like to know if this might be a problem with my installation.

Not at all. The function PRINT-OBJECT is called when lispinit.mem is
built (on objects of type CONDITION), and the info that it has been called
is remembered in lispinit.mem.

I am a bit unhappy about this warning because PRINT-OBJECT is meant to
be extended even after having been called, but I don't see in which
respect PRINT-OBJECT is special among all generic functions.