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From: Philipp
Newsgroups: gmane.emacs.bugs
Subject: bug#53071: 28.0.90;
Emacs 28 regression: incorrect code generation for complex pcase
forms?
Date: Wed, 12 Jan 2022 03:19:42 +0100
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> Am 07.01.2022 um 10:36 schrieb Philipp Stephani =
:
>=20
>=20
> I hit the following subtle Edebug regression in Emacs 28:
>=20
> Create a file /tmp/pcase-edebug.el with these contents:
>=20
> $ cat /tmp/pcase-edebug.el=20
> ;; -*- lexical-binding: t; -*-
> (require 'rx)
> (defun f (a)
> (pcase a
> ((rx bos (let q (opt (let r nonl)) (let a nonl)))
> (message "%s" a))
> ((rx bos eos)
> (message "%s" a))))
>=20
> Visit the file in Emacs:
>=20
> $ emacs -Q -l rx /tmp/pcase-edebug.el
>=20
> Move point into the `f' function and instrument it using C-u C-M-x.
> Then, byte-compile `f' using M-: (byte-compile 'f).
> In Emacs 28, this will generate the following warnings:
>=20
> Warning: Unused lexical variable `q'
> Warning: Unused lexical variable `r'
> Warning: reference to free variable =E2=80=98a=E2=80=99
>=20
> The first two are expected, the third one is not.
> Indeed, M-: (f "ab") and stepping through the code will signal an =
error:
>=20
> Symbol's value as variable is void: a
'git bisect' claims that the following commit is the culprit:
commit 1362a9fec4dff341a84c881ac17dbf1ee2cf82fd
Author: Mattias Engdeg=C3=A5rd
Date: Fri Mar 5 20:21:01 2021 +0100
Make lambda-lifting work again
=20