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Date: Thu, 20 Jun 2019 06:02:14 +0100
From: Stephane Chazelas <stephane.chazelas@gmail.com>
To: Zsh hackers list <zsh-workers@zsh.org>
Subject: [bug] {fd}<<EOF
Message-ID: <20190620050214.iex364omy7kfxqng@chaz.gmail.com>
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$ zsh -xc $': {fd}<< EOF\nEOF'
+zsh:1> [[ - $'\C-D'zsh:1: bad cond code
 ]]

On the more complicated code I first ran into the problem, it
was crashing with "out of memory".

exec {fd}<<EOF
EOF

is a bash-compatible way to get a temp file that automatically
cleans up on exit. Needs Linux or Cygwin to manipulate it with
/dev/fd/$fd

-- 
Stephane