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- To: Greenwald@STONY-BROOK.SCRC.Symbolics.COM
- Subject: backquote
- From: Jon L White <email@example.com>
- Date: Sun, 13 Nov 88 20:04:56 PST
- Cc: KMP@STONY-BROOK.SCRC.Symbolics.COM, firstname.lastname@example.org, email@example.com
- In-reply-to: Michael Greenwald's message of Fri, 11 Nov 88 12:57 EST <19881111175759.2.GREENWALD@SWALLOW.SCRC.Symbolics.COM>
re: Could you forward this doubly nested example to me, so that the Genera
reader >will< be able to parse it in future releases?
I think it is ``(,@,@x). Believe it or not, one can "crank" the rules
of CLtL p349-50 to come up with a meaning for it. Lucid, Xerox, and
VAXLISP get it "right" according to that meaning. Several others generate
a read-time error (which is what I think Symbolics 7.0 does). I've seen
some that parse it without error but subsquently generate wrong code.
As to whether this was ever used in naturally occurring code -- I dunno.
Ask QUUX (Guy L Steele).
-- JonL --
P.S.: When trying to work out an example using the rules of CLtL p340-50,
it's important to remember that the square-brackets are part of the
syntax of that crufty litle production-rule language. They are not
- From: Michael Greenwald <Greenwald@STONY-BROOK.SCRC.Symbolics.COM>