From: Wolfgang Jenkner <wjenkner@inode.at>
To: Nic Ferrier <nferrier@ferrier.me.uk>
Cc: emacs-devel@gnu.org
Subject: Re: macroexpand-all and cl-macrolet
Date: Mon, 19 Aug 2013 14:08:13 +0200 [thread overview]
Message-ID: <85wqnhq3wy.fsf@inode.at> (raw)
In-Reply-To: 87wqnk15nl.fsf@ferrier.me.uk
On Sat, Aug 17 2013, Nic Ferrier wrote:
> Is macroexpand-all not supposed to work with macrolet?
>
> (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)))
However, the following form evaluates to the desired expansion of nlet.
It is inspired by the description of `macroexpand' in the CLHS, in
particular by the remark about `macrolet' and the examples given there,
see
http://www.lispworks.com/documentation/HyperSpec/Body/f_mexp_.htm
(progn
(require 'cl-lib)
(cl-defmacro macroexpand-all-locally (form &environment env)
`(macroexpand-all ,form ',env))
(cl-macrolet
((nlet (bindings &rest body)
`(apply
(lambda ,(mapcar 'car bindings) ,@body)
(list ,@(mapcar 'cadr bindings)))))
(macroexpand-all-locally
'(nlet ((a 1)
(b '(10)))
(* a (car b))))))
Wolfgang
next prev parent reply other threads:[~2013-08-19 12:08 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
2013-08-19 12:08 ` Wolfgang Jenkner [this message]
2013-08-19 18:14 ` Nic Ferrier
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