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  1. or download this
        my $x= some_sub() ||| 0;
  2. or download this
        my $x= some_sub();
    $x |||= 0;
  3. or download this
        my $x= def( some_sub(), -1 );
  4. or download this
        my $x= some_sub();
    def( $x, -1 );