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From: Sebastian Gniazdowski <sgniazdowski@gmail.com>
Date: Wed, 24 Jul 2019 01:50:23 +0200
Message-ID: <CAKc7PVBZa=G0D1v4u9=257O20N85r26HWmjtpxVrNvfoUp-PSQ@mail.gmail.com>
Subject: [bug] Math evaluation done twice in subscript in specific conditions
To: Zsh hackers list <zsh-workers@zsh.org>
Content-Type: text/plain; charset="UTF-8"

Hello
This is interesting:

idx=0
a=()
: ${a[++idx]::=$idx}
print -rl $a
-> 1
: ${a[++idx]::=$idx}
print -rl $a
-> 1
-> 3
idx=1
: ${a[++idx]::=$idx}
print -rl $a
-> 1
-> 2
-> 3

So apparently the assignment to idx does change something for the
following ::= "call" and makes it work correctly. The second and
following ::= calls cause $idx to increment twice.

-- 
Sebastian Gniazdowski
News: https://twitter.com/ZdharmaI
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Blog: http://zdharma.org