o This fixes Bug#122135 from the Debian bug-tracking system: The setf
function for LISP:FIND-CLASS now accepts and ignores the optional errorp and environment arguments, as per ANSI. o It now also allows nil as the new-value, as per ANSI, and dissociates any defined class from the given name. Note that this only works as expected if the user also does a setf of PCL::FIND-CLASS with NIL. LISP:FIND-CLASS and PCL::FIND-CLASS need tighter integration.
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