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bug#34781: 27.0.50; integer in pcase sometimes compared by eq


From: Michael Heerdegen
Subject: bug#34781: 27.0.50; integer in pcase sometimes compared by eq
Date: Thu, 28 Mar 2019 22:30:33 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux)

Paul Eggert <address@hidden> writes:

> On 3/28/19 12:47 PM, Michael Heerdegen wrote:
> > AFAIU the patch only corrects an optimization (use `memq' instead of
> > `member') that doesn't work for bignums.  This can never be harmful.
>
> Isn't it harmful if a 64-bit Emacs decides that the optimization is safe
> for the fixnum 1000000000 and thus generates the faster code, but the
> code is put into an .elc file and then loaded by a 32-bit emacs that
> treats 1000000000 as a bignum?

Ah ok - yes, I guess that would indeed happen.

Michael.





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