COPY-SYMBOL-COPY-PLISTCOPY-SYMBOL, where the COPY-PROPS optional argument is non-NIL, says that a copy of the property list is used as the new symbol's property list. However, there are several ways in which a list may be copied, most notably COPY-LIST and COPY-TREE, and the description doesn't say which mechanism should be used.COPY-SYMBOL copies the property list of the symbol, it is as if (COPY-LIST (SYMBOL-PLIST sym)) were used as the new symbol's property list.COPY-LIST is the simplest list-copying primitive. The result of this copy is that GET returns EQL results for the two symbols until one of the property lists is altered, but altering either of the property lists doesn't affect the other. This is current practice in the implementations I tested, and probably what most users assume.----- End Forwarded Messages -----