ksh with input redirection in conjunction with pipes leads to syntax error `here-document not contained within command substitution`
Issue
Following script
#!/bin/ksh
#
cat <<EOF | echo $(hostname)
qwerty
EOF
fails with message:
ksh: syntax error at line 3: `'<<EOF' here-document not contained within command substitution`
Environment
- Red Hat Enterprise Linux (RHEL) 6.4 and 6.5
ksh-20120801-10.el6ksh-20100621-19.el6_4.4
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