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Technical issues of separation in function cells and value cells (1988)

Because Lisp contains QUOTE, there is actually an arbitrary number of namespaces because of the existence of functions like GET, and GETHASH that allow users to effectively associate new kinds information with symbols. For there are to be no net change in the amount of storage between two-namespace and a one-namespace Lisp, more than 1100 symbols would need to be added to the system to resolve name conflicts. Closely related to this issue is the fact that there is currently no system-provided dynamic variation of FLET and LABELS in Common Lisp, although in a nonmultiprocessing environment they can be simulated by creative use of UNWIND-PROTECT.

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