From: Stefan Monnier <monnier@iro.umontreal.ca>
To: help-gnu-emacs@gnu.org
Subject: Re: Macro Expansion Inconsistency
Date: Tue, 16 Dec 2014 18:30:57 -0500 [thread overview]
Message-ID: <jwvwq5rrxb6.fsf-monnier+gmane.emacs.help@gnu.org> (raw)
In-Reply-To: slrnm917tq.h18.joost.m.kremers@j.kremers4.news.arnhem.chello.nl
> (defmacro test (name)
> `(let* ((name ',name)
> (symbol (intern (concat "some" "-" (symbol-name name)))))
> ,symbol))
You have 2 macros here: the one you define (test) and the one you use
(backquote). The problem is in the one you *use*.
I.e. you can reproduce your problem by running the following:
`(let* ((name ',"hello")
(symbol (intern (concat "some" "-" (symbol-name "hello")))))
,symbol))
I.e. the `symbol' variable should be bound in `let' that is executed
during the macro expansion whereas you instead return a form that binds
it (so this `let' binding of `symbol' would only happen later when the
expanded code is executed, which here doesn't happen since you first
try to get the value of `symbol' which signal an error since there is
no such variable at that time).
Stefan
next prev parent reply other threads:[~2014-12-16 23:30 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <mailman.16228.1418763453.1147.help-gnu-emacs@gnu.org>
2014-12-16 21:10 ` Macro Expansion Inconsistency Joost Kremers
2014-12-16 21:25 ` Alexander Shukaev
2014-12-16 21:46 ` John Mastro
2014-12-16 22:58 ` Alexander Shukaev
2014-12-16 23:14 ` Alexander Shukaev
2014-12-17 2:19 ` Alexander Shukaev
2014-12-17 10:04 ` Nicolas Richard
2014-12-17 14:03 ` Alexander Shukaev
2014-12-17 14:20 ` Stefan Monnier
2014-12-17 14:34 ` Alexander Shukaev
2014-12-17 14:21 ` Nicolas Richard
2014-12-17 14:52 ` Alexander Shukaev
2014-12-17 14:58 ` Nicolas Richard
2014-12-17 15:14 ` Alexander Shukaev
[not found] ` <mailman.16290.1418825041.1147.help-gnu-emacs@gnu.org>
2014-12-17 15:53 ` Barry Margolin
2014-12-17 16:01 ` Alexander Shukaev
[not found] ` <mailman.16262.1418782759.1147.help-gnu-emacs@gnu.org>
2014-12-17 3:03 ` Rusi
2014-12-17 9:21 ` Nicolas Richard
2014-12-16 23:20 ` John Mastro
[not found] ` <CAKu-7WzgoHH=zM_jxeVGMwzAne88nAoCUsLKQv9zUYo_amsjNg@mail.gmail.com>
2014-12-17 3:34 ` John Mastro
2014-12-17 3:41 ` John Mastro
2014-12-16 23:30 ` Stefan Monnier [this message]
2014-12-16 20:57 Alexander Shukaev
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