GNU bug report logs - #34781
27.0.50; integer in pcase sometimes compared by eq

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Message #22 received at 34781 <at> debbugs.gnu.org (full text, mbox):

From: Michael Heerdegen <michael_heerdegen <at> web.de>
To: Paul Eggert <eggert <at> cs.ucla.edu>
Cc: Mattias Engdegård <mattiase <at> acm.org>,
 34781 <at> debbugs.gnu.org
Subject: Re: bug#34781: 27.0.50; integer in pcase sometimes compared by eq
Date: Thu, 28 Mar 2019 20:47:42 +0100

Paul Eggert <eggert <at> cs.ucla.edu> writes:

> What happens if a source file that uses pcase is compiled on a 64-bit
> machine that has wide fixnums, and is then loaded and run on a 32-bit
> machine that has narrow fixnums? Will this pcase code still work? And
> if not, are there similar bugs elsewhere in the pcase code?

AFAIU the patch only corrects an optimization (use `memq' instead of
`member') that doesn't work for bignums.  This can never be harmful.

I had a quick look at pcase.el, and also tried the obvious cases (quote,
backquote), and didn't find any other obvious bug.


Michael.

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