GNU bug report logs - #66938
30.0.50 [PATCH]: Make EIEIO :accessor behave like :reader when reading a slot's value

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From: João Távora <joaotavora <at> gmail.com>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>, 66938 <at> debbugs.gnu.org,  brandon.irizarry <at> gmail.com
Cc: 66938-done <at> debbugs.gnu.org
Subject: bug#66938: 30.0.50 [PATCH]: Make EIEIO :accessor behave like :reader when reading a slot's value
Date: Wed, 29 Nov 2023 00:29:31 +0000

Just wanted to say that while I think this is all very fine to
improve on EIEIO's inaccurate emulation of CLOS, this breaks
a lot of stuff, broke Eglot and Jsonrpc, immediately.

This is mainly because EIEIO users like me got sloppy with
their slot definitions and don't put explicit :initforms
in them, instead relying on this quirk.

Oh well, I'm fixing this now as part of bug#67480, but
we should definitely expect flak more or less proportional
to the use of EIEIO out there (and in here).

BTW another reason I get sloppy is that EIEIO doesn't allow
me to use a

(some-slot :initform (error "required!") ...)

like I do in CLOS.

The initform is meant to be evaluated during instantiation
(that's why it's a "form" ;-) )

João

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