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bug#13343: 24.3.50; give examples using `gv-define-expander' and `gv-let

From: Lars Ingebrigtsen
Subject: bug#13343: 24.3.50; give examples using `gv-define-expander' and `gv-letplace'
Date: Thu, 15 Aug 2019 23:58:19 -0700
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux)

"Drew Adams" <address@hidden> writes:

> (elisp) `Adding Generalized Variables' says only this:
>   For more control over the expansion, see the macro `gv-define-expander'.
>   The macro `gv-letplace' can be useful in defining macros that perform
>   similarly to `setf'; for example, the `incf' macro of Common Lisp.
>   Consult the source file `gv.el' for more details.
> That's a complete cop-out.  Give at least one example of using each of
> `gv-define-expander' and `gv-letplace'.

I've now added this to the trunk.  

(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

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