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    open OLDERR,">&",\*STDERR or die "Can't dup STDERR: $!";
    open STDERR,'>>',"foo.out" or die "Can't redirect STDERR: $!";
    eval 'use Cache::File';
    open STDERR, ">&OLDERR" or die "Can't dup OLDERR: $!";

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Name "main::OLDERR" used only once: possible typo...