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  1. or download this
    open NUL, '<', 'nul' or die $!;;
defined( $s = readline( NUL )) or die $!;;
[Died at (eval 9) line 1.
  2. or download this
    open O, '>', 'nul' or die $!;;
defined( $s = readline( O )) or die $!;;
Filehandle O opened only for output at (eval 11) line 1.