ksh with input redirection in conjunction with pipes leads to syntax error `here-document not contained within command substitution`

Solution In Progress - Updated -

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.el6
  • ksh-20100621-19.el6_4.4

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