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bug#6985: rx patterns don't compose

From: Stefan Monnier
Subject: bug#6985: rx patterns don't compose
Date: Sun, 05 Sep 2010 09:22:04 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.0.50 (gnu/linux)

> It's not possible to do this currently:
> (defconst foo-re (rx "abc"))
> (defconst bar-re (rx (* (what-goes-here? foo-re)))

(defconst foo-re (rx "abc"))
(defconst bar-re `(rx (* (regexp ,foo-re)))

> in any sensible way. This won't work

>   (defconst bar-re (rx (* (regexp foo-re))))

> because regexp always expects a string.

> This won't work, because eval always quotes its argument:

>   (defconst bar-re (rx (* (eval foo-re))))

> I propose allowing regexp to accept a symbol as well as a string, and
> using that symbol's value literally. Alternatively, rx could provide an
> eval-unquoted facility. Or both.

eval-unquoted sounds OK


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