From: Nathan Trapuzzano <nbtrap@nbtrap.com>
To: Stefan Monnier <monnier@iro.umontreal.ca>
Cc: emacs-devel@gnu.org
Subject: Re: Double unquote/unquote-splicing
Date: Mon, 04 Nov 2013 13:11:26 -0500 [thread overview]
Message-ID: <87vc08dokx.fsf@nbtrap.com> (raw)
In-Reply-To: <874n7sf3pi.fsf@nbtrap.com> (Nathan Trapuzzano's message of "Mon, 04 Nov 2013 12:59:21 -0500")
Nathan Trapuzzano <nbtrap@nbtrap.com> writes:
> This is incorrect. ``(a ,,@x) where x=(1 2 3) would evaluate to
> (\` (a (\, 1) (\, 2) (\, 3))). The first comma in ,,@ has the effect of
> being applied member-wise to each element spliced out of ,@. Cf. CLHS
> `Backquote' (http://www.lispworks.com/documentation/HyperSpec/Body/02_df.htm).
By the way, like in Common Lisp, what backquote/unquote/unquote-splicing
expand to is not defined. What's defined is the effect of their
evaluation, so what I presented here doesn't _have_ to be the way ,,@
works. For example, in Elisp, the expression in question may very well
expand to (\` (a (\, 1 2 3))) (as you say) so long as it is semantically
equivalent to (\` (a (\, 1) (\, 2) (\, 3))).
next prev parent reply other threads:[~2013-11-04 18:11 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-11-04 14:03 Double unquote/unquote-splicing Nathan Trapuzzano
2013-11-04 17:27 ` Stefan Monnier
2013-11-04 17:59 ` Nathan Trapuzzano
2013-11-04 18:11 ` Nathan Trapuzzano [this message]
2013-11-04 18:33 ` Stefan Monnier
2013-11-04 19:01 ` Drew Adams
2013-11-04 19:09 ` Nathan Trapuzzano
2013-11-04 20:41 ` Stefan Monnier
2013-11-05 15:03 ` Nathan Trapuzzano
2013-11-05 19:14 ` Stefan Monnier
2013-11-05 4:01 ` Stephen J. Turnbull
2013-11-05 15:22 ` Nathan Trapuzzano
2013-11-05 21:48 ` Stephen J. Turnbull
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