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To: zsh-workers@zsh.org
From: YAMAGUCHI Takanori <t-yama@iij.ad.jp>
Subject: arithmetic expression from outside
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Message-ID: <69f3c9f0-b91b-beb1-d36c-854bb4eb3ff3@iij.ad.jp>
Date: Thu, 5 Sep 2019 17:49:31 +0900
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Is this an intended behaviour?

% cat sum.sh
sum=0
while read n; do
  sum=$((sum+n))
done
echo $sum
% seq 10 | zsh sum.sh
55
% yes ++sum | head -10 | zsh sum.sh
2046
% echo 'sum[$(echo Hello, world!>&2)]' | zsh sum.sh
Hello, world!
sum.sh:3: bad math expression: empty string
% zsh -c 'echo $ZSH_VERSION'
5.5.1