arithmetic expression from outside

From	YAMAGUCHI Takanori <t-yama@iij.ad.jp>
Newsgroups	gnu.bash.bug
Subject	arithmetic expression from outside
Date	2019-09-05 17:40 +0900
Message-ID	<mailman.420.1567687701.2075.bug-bash@gnu.org> (permalink)
References	<f1159f8a-741a-9c65-53be-bb29f223a2e4@iij.ad.jp>

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Is this an intended behaviour?

% cat sum.sh
sum=0
while read n; do
  sum=$((sum+n))
done
echo $sum
% seq 10 | bash sum.sh
55
% yes ++sum | head -10 | bash sum.sh
1023
% echo 'x[$(echo Hello, world!>&2)]' | bash sum.sh
Hello, world!
0
% bash -c 'echo $BASH_VERSION'
5.0.9(0)-release

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arithmetic expression from outside YAMAGUCHI Takanori <t-yama@iij.ad.jp> - 2019-09-05 17:40 +0900

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