Blame tests/case-fold-backref

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#!/bin/sh
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# This would fail for grep-2.5.3
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. "${srcdir=.}/init.sh"; path_prepend_ ../src
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printf '%s foo\n' foo fOo Foo FOO > exp1 || framework_failure_
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fail=0
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for LOC in en_US.UTF-8 en_US zh_CN $LOCALE_FR_UTF8 C; do
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  out=out1-$LOC
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  LC_ALL=$LOC grep -Ei '(foo) \1' exp1 > $out || fail=1
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  compare exp1 $out || fail=1
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done
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Exit $fail