[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re-defining COMMON-LISP symbols
- To: sears%wrs.DEC@DECWRL.DEC.COM
- Subject: Re-defining COMMON-LISP symbols
- From: "Scott E. Fahlman" <Fahlman@C.CS.CMU.EDU>
- Date: Thu, 09 Apr 1987 18:53:00 -0000
- Cc: common-lisp@SAIL.STANFORD.EDU
- In-reply-to: Msg of 9 Apr 1987 14:14-EDT from sears%wrs.DEC at decwrl.DEC.COM
- Sender: FAHLMAN@C.CS.CMU.EDU
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