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  1. or download this
    use constant is_perl55 => ($] < 5.005_50);
    use constant is_perl56 => ($] < 5.007 && $] > 5.005_50);
    use constant is_sane_perl => $] > 5.007;
    
  2. or download this
    use constant 'is_perl55' => ($] < 5.005_50);
    use constant 'is_perl56' => ($] < 5.007 && $] > 5.005_50);
    use constant 'is_sane_perl' => $] > 5.007;