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Re-defining COMMON-LISP symbols
Obviously we need a clarification about whether you can redefine CONS
and friends, globally or with FLET/LABELS.
There is a closely related operation, which consists of defining a new
symbol of the same name as an existing symbol in COMMON-LISP, and
shadowing that symbol in some package of the users choice. This operation
is necessary, in my view, for defining new systems on top of COMMON-LISP.
A number of systems currently being built depend on this functionality.
I don't see any question here. MY-PACKAGE:CONS is a different symbol
from LISP:CONS, and you can give it whatever definition you want. This
doesn't even confuse macros, since they deal in symbols and not print