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bug#67116: byte-compile-let: reversing the order of evaluation of the cl
From: |
Alan Mackenzie |
Subject: |
bug#67116: byte-compile-let: reversing the order of evaluation of the clauses CAN make a difference |
Date: |
Mon, 13 Nov 2023 13:14:21 +0000 |
Hello, Mattias.
On Mon, Nov 13, 2023 at 12:19:27 +0100, Mattias Engdegård wrote:
> > There's a bug here, will fix.
> Now fixed on master. I'm very pleased that you reported this bug.
> (Of course it didn't have anything to do with order of evaluation at
> all but you already understood that.)
Thanks for the fix!
Yes, Stefan M. was right, here. I think it was caused by a (relatively)
recent optimisation introduced into the compiler.
> I didn't do a deep analysis of what code was affected by the bug but
> measuring changes in the bytecode size, which is usually quite good,
> only two places turned up: jit-lock--debug-fontify, which you already
> noticed, and c-forward-sws in cc-engine.el, where the code
> (c-put-in-sws rung-pos
> (setq rung-pos (point)
> last-put-in-sws-pos rung-pos)))
> was probably affected here. (Obviously the bug was out to get you
> personally, Alan.)
I'll have a look at that, sometime. It somehow doesn't feel particularly
urgent at the moment.
--
Alan Mackenzie (Nuremberg, Germany).
bug#67116: byte-compile-let: reversing the order of evaluation of the clauses CAN make a difference., Alan Mackenzie, 2023/11/12
bug#67116: byte-compile-let: reversing the order of evaluation of the clauses CAN make a difference, Mattias Engdegård, 2023/11/12