From: Stefan Monnier <monnier@iro.umontreal.ca>
To: "白井 彰" <okshirai@gmail.com>
Cc: 15538@debbugs.gnu.org
Subject: bug#15538: 24.3; Incorrect Expansion of Nested Backquote
Date: Tue, 08 Oct 2013 00:30:45 -0400 [thread overview]
Message-ID: <jwv61t84dsh.fsf-monnier+emacsbugs@gnu.org> (raw)
In-Reply-To: <C02519AC-00D8-4C90-85CD-7D612807C683@gmail.com> ("白井 彰"'s message of "Sun, 6 Oct 2013 20:23:08 +0900")
> ``(,,@q)
> (\` ((\, r s)))
> ((3 5)) ; Incorrect: This should be ((3 5)
> (4 6))
Indeed, it's incorrect, but I think the intention of the current code is
to consider the above expression as invalid, so the error is to return
a value at step 2 (ignoring the second argument `s' to the unquote)
instead of signalling an error.
If you really want that result, you can do
``(,@(list ,@q))
> ``(,@,@q)
And here, you'd have to use
``(,@(append ,@q))
I installed a patch into trunk which catches the above problems and
signals an error if/when encountering such situations.
Thank you,
Stefan
next prev parent reply other threads:[~2013-10-08 4:30 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-10-06 11:23 bug#15538: 24.3; Incorrect Expansion of Nested Backquote 白井 彰
2013-10-08 4:30 ` Stefan Monnier [this message]
2013-10-28 22:47 ` Nathan Trapuzzano
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