copy-readtable

(copy-readtable &optional from to)

Lite stub: a no-op returning nil — the reader is not readtable-driven, so there is no readtable object to copy (the *readtable* variable exists but is seeded to nil). The arguments are still evaluated. Exists so the common library header idiom (defparameter *my-readtable* (copy-readtable nil)) loads.