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Subject: Incomplete command substitution in here-document not regarded as an error
Date: Thu, 7 Nov 2019 00:37:41 +0300
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Xref: csiph.com gnu.bash.bug:15571

cat <<EOF
$(seq 10
EOF

prints 1, while it should report a syntax error.

Can be reproduced on bash 4.4.20 and 5.0.11