bug#47572: 27.1; (setf (map-elt m key) value) should return value but does not

[Lars Ingebrigtsen]

Matt Armstrong <matt@rfc20.org> writes:

> Attached is an ert test that demonstrates the problem.  The crux is
> that:
>
>   (require 'map)
>   (setf (map-elt m key) value)
>
> returns VALUE only in the hash table implementation.  `setf' should
> return VALUE in all cases.
>
> For alists it returns either nil or (key . value) depending on whether a
> key is inserted or udpated in place.  For plists it returns similarly
> variable things.

Thanks; I've included your tests in Emacs 28, and fixed the map-elt code
(hopefully; it passes all the tests, at least).

-- 
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   bloggy blog: http://lars.ingebrigtsen.no