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bash 4 parse error on here-document in $()


From: Martin Sebor
Subject: bash 4 parse error on here-document in $()
Date: Wed, 23 Sep 2009 14:37:27 -0600
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1.1) Gecko/20090814 Fedora/3.0-2.6.b3.fc11 Thunderbird/3.0b3

Configuration Information [Automatically generated, do not change]:
Machine: i386
OS: linux-gnu
Compiler: gcc
Compilation CFLAGS: -DPROGRAM='bash' -DCONF_HOSTTYPE='i386' -DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='i386-redhat-linux-gnu' -DCONF_VENDOR='redhat' -DLOCALEDIR='/usr/share/locale' -DPACKAGE='bash' -DSHELL -DHAVE_CONFIG_H -I. -I. -I./include -I./lib -D_GNU_SOURCE -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m32 -march=i586 -mtune=generic -fasynchronous-unwind-tables uname output: Linux mslaptop 2.6.30.5-43.fc11.i586 #1 SMP Thu Aug 27 21:18:54 EDT 2009 i686 i686 i386 GNU/Linux
Machine Type: i386-redhat-linux-gnu

Bash Version: 4.0
Patch Level: 23
Release Status: release

Description:
        Bash 4.0 errors on a here-document enclosed in $(). For example:
        x=$(cat <<EOF
        foo
        bar
        EOF)
        Ctrl+D
        -bash: unexpected EOF while looking for matching `)'
        -bash: syntax error: unexpected end of file

Repeat-By:
        Save the following script in a file named t.sh, execute the file
        and observe the parse error:
        ./t.sh: line 7: unexpected EOF while looking for matching `)'
        ./t.sh: line 13: syntax error: unexpected end of file

        #!/bin/bash
        x=`cat <<EOF
        foo
        bar
        EOF`

        y=$(cat <<EOF
        foo
        bar
        EOF)

        [ "$x" != "$y" ] && exit 1




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