GNU bug report logs - #36139
[PATCH] Make better use of the switch op in cond forms

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From: Mattias Engdegård <mattiase <at> acm.org>
To: Noam Postavsky <npostavs <at> gmail.com>
Cc: 36139 <at> debbugs.gnu.org, Stefan Monnier <monnier <at> iro.umontreal.ca>, Drew Adams <drew.adams <at> oracle.com>
Subject: bug#36139: [PATCH] Make better use of the switch op in cond forms
Date: Tue, 11 Jun 2019 13:12:26 +0200

10 juni 2019 kl. 17.38 skrev npostavs <at> gmail.com:
> 
> Redefining eq, equal, memq, or member with defun or advice is already
> unreliable because they are translated to byte codes.  eql and memql are
> not, so this patchset (specifically, the last 2 patches, I think) would
> make the situation a bit worse for those functions, in that it would
> prevent defun/advice override for eql and memql from applying in cond
> forms.

`eql' is already recognised for switch generation in cond forms today. More generally, is redefinition of such fundamental built-ins really a serious concern? The compiler assumes standard semantics for plenty of functions, byte-codes or not. This is also mentioned in the manual.

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