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Re: Variable binding discipline
- To: Richard M. Stallman <RMS at MIT-AI>
- Subject: Re: Variable binding discipline
- From: Guy.Steele at CMU-10A
- Date: Thu ,18 Jun 81 14:52:00 EDT
- Cc: lisp-forum at MIT-MC
- In-reply-to: Richard M. Stallman's message of 18 Jun 81 04:48-EST
(1) Sorry -- in my description of the proposed scheme I omitted
the description of LOCAL-DECLARE, either out of brevity or laziness.
Indeed, one could use LOCAL-DECLARE to override the default
interpretation of an ordinary variable.
(2) While LABELS *could* be bad for extensibility, it needn't necessarily
be bad (let alone "very bad"). I agree that LABELS ought to be used
sparingly. One of the reasons for putting it into a real language
is to find out the extent of its usefulness (I think that it has *some*
usefulness is already established).
Often redefinability of functions is what you want. On the other
hand, when I write REVERSE using REVERSE1, I don't particularly want
REVERSE1 to be redefined. (Tracing is another matter.)