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{
    vec(my $str, 2, 1) = 1;
    vec($str, 5, 1) = 1;
...
        $str & $foo == $str;
    }
}

{
    vec(my $str, 2, 1) = 1;
    vec($str, 5, 1) = 1;
...
        not ($foo & $str) ^ ($bar & $str);
    }
}