From: Stefan Monnier <monnier@iro.umontreal.ca>
To: help-gnu-emacs@gnu.org
Subject: Re: Compiling a recursive macro
Date: Thu, 11 Jun 2020 16:57:05 -0400 [thread overview]
Message-ID: <jwvtuzh8gtj.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: 22b55d6d-f719-98d9-f8c8-e72e7fc43497@gmail.com
> That suggests to me that you can't compile any recursive macro.
Depends what you mean by "recursive macro".
What this prevents is to use a macro inside the definition of a macro.
Most cases of "recursive macros" instead just returns code which
itself uses that macro. In that case, there's no real recursion: the
macro just returns a list which happens to include a symbol which has
the same name as the macro. And then the macro-expander will end up
calling that macro back when it gets to macro-expanding that chunk
of code.
This works just fine (and may inf-loop, of course).
Stefan
next prev parent reply other threads:[~2020-06-11 20:57 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-11 20:15 Compiling a recursive macro Douglas Lewan
2020-06-11 20:57 ` Stefan Monnier [this message]
2020-06-11 21:23 ` Douglas Lewan
2020-06-11 21:32 ` Michael Heerdegen
2020-06-11 21:38 ` Douglas Lewan
2020-06-11 21:55 ` Michael Heerdegen
2020-06-11 22:21 ` Douglas Lewan
2020-06-12 10:49 ` Michael Heerdegen
2020-06-12 16:11 ` Douglas Lewan
2020-06-12 2:10 ` Douglas Lewan
2020-06-13 9:49 ` Michael Heerdegen
2020-06-13 13:34 ` Jakub Jankiewicz
2020-06-11 22:02 ` Stefan Monnier
2020-06-11 21:27 ` Michael Heerdegen
2020-06-12 0:03 ` Jakub Jankiewicz
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