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  1. or download this
    use strict;
use warnings;
...
    Dump($x);
    Dump($_) for ( ($x, $y, undef) = 1..10), $x, $y;
}
  2. or download this
    SV = NULL(0x0) at 0x8ad23d0
  REFCNT = 1
...
  CUR = 2
  LEN = 4
Modification of a read-only value attempted at ./test.pl line 12.