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#! /bin/sh
# Before grep-2.19, grep -P and -w/-x would not work with a back-reference.
#
# Copyright (C) 2014-2021 Free Software Foundation, Inc.
#
# Copying and distribution of this file, with or without modification,
# are permitted in any medium without royalty provided the copyright
# notice and this notice are preserved.
. "${srcdir=.}/init.sh"; path_prepend_ ../src
require_pcre_
echo aa > in || framework_failure_
echo 'grep: reference to non-existent subpattern' > exp-err \
|| framework_failure_
fail=0
for xw in x w; do
grep -P$xw '(.)\1' in > out 2>&1 || fail=1
compare out in || fail=1
grep -P$xw '(.)\2' in > out 2> err && fail=1
compare /dev/null out || fail=1
compare exp-err err || fail=1
done
Exit $fail
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