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From: Daniel Shahaf <d.s@daniel.shahaf.name>
To: zsh-workers@zsh.org
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Date: Tue, 27 Jun 2017 08:38:42 +0000
Subject: Src/exec.c:3961: BUG: q = 13 != queue_in = 14

The error is reproducible, but my current recipe requires z-sy-h.
Haven't tried yet to minimize that, sorry.

Recipe:
[[[
$ git clone https://github.com/zsh-users/zsh-syntax-highlighting /tmp/zsh-s=
yntax-highlighting
$ Src/zsh -f=20
% source /tmp/zsh-syntax-highlighting/zsh-syntax-highlighting.zsh=20
% echo <TAB>
2: =E2=80=A6/Src/exec.c:3961: BUG: q =3D 13 !=3D queue_in =3D 14
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
]]]

Bisected to:
[[[
commit e51c9c17af51e4055efb5a2cc36739d1d7ae457f
Author: Barton E. Schaefer <schaefer@zsh.org>
Date:   Sun Jan 29 08:30:14 2017 -0800

    40453: signal handler safety for callers of patcompile(PAT_STATIC), whi=
ch is not re-entrant.
]]]

Using these versions:
% echo $ZSH_PATCHLEVEL
zsh-5.3.1-229-gd78761c
% (cd /tmp/zsh-syntax-highlighting && git rev-parse HEAD)
ad522a091429ba180c930f84b2a023b40de4dbcc
%=20

A similar issue was reported in 40463 (sic).

Cheers,

Daniel