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  1. or download this
    sub first (&@) {
  my $code = shift;
...

  undef; # <====== BUG?
}
  2. or download this
    D:\workspace> perl
D:\eclipse\workspace\BDC\lib> perl
...
          undef
        ];
In scalar-context: true
  3. or download this
    D:\workspace>perl -MList::Util -le "print $List::Util::VERSION"
1.19