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if (FOO=FOO; unset FOO) >/dev/null 2>&1; then
as_unset=unset
else
as_unset=false
fi
$as_unset VERSION_CONTROL SIMPLE_BACKUP_SUFFIX
if test "${VERSION_CONTROL+set}" = set; then
echo "$0: the VERSION_CONTROL envvar is set --" \
' unset it and rerun this test' >&2
exit 1
fi
if test "${SIMPLE_BACKUP_SUFFIX+set}" = set; then
echo "$0: the SIMPLE_BACKUP_SUFFIX envvar is set --" \
' unset it and rerun this test' >&2
>&2
exit 1
fi
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