From: Stefan Monnier <monnier@IRO.UMontreal.CA>
To: Nic Ferrier <nferrier@ferrier.me.uk>
Cc: emacs-devel@gnu.org
Subject: Re: macroexpand-all and cl-macrolet
Date: Sun, 18 Aug 2013 22:51:28 -0400 [thread overview]
Message-ID: <jwvhaems8dt.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <87wqnk15nl.fsf@ferrier.me.uk> (Nic Ferrier's message of "Sat, 17 Aug 2013 20:25:18 +0100")
> Is macroexpand-all not supposed to work with macrolet?
Depends what you mean.
> (progn
> (cl-macrolet
> ((nlet (bindings &rest body)
> `(apply
> (lambda ,(mapcar 'car bindings) ,@body)
> (list ,@(mapcar 'cadr bindings)))))
> (macroexpand-all
> '(nlet ((a 1)
> (b '(10)))
> (* a (car b))))))
> => (nlet ((a 1)
> (b (quote (10))))
> (* a (car b)))
cl-macrolet says that nlet will be bound as a macro during
macroexpansion of
(macroexpand-all
'(nlet ((a 1)
(b '(10)))
(* a (car b))))
But macroexpand-all will not run during the macroexpansion of
that expression. After all, it's a plain function that will only be run
later after its macro-expansion is over.
So macroexpand-all will only get to look at the `nlet' call when that
code is *run* at which point the `nlet' definition provided by macrolet
is "long gone".
Stefan
next prev parent reply other threads:[~2013-08-19 2:51 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-08-17 19:25 macroexpand-all and cl-macrolet Nic Ferrier
2013-08-19 2:51 ` Stefan Monnier [this message]
2013-08-19 12:08 ` Wolfgang Jenkner
2013-08-19 18:14 ` Nic Ferrier
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