• You assumed that the iterator variable will be created at the same memory address every pass of the loop. It's a bad assumption. For example, the following code is an infinite loop:

  my @x;
  while (deal [1..9] => my ($a,$b,$c) ){
    print $a,$b,$c;
    push @x, \$a;
  }
  [download]

  Well, maybe not infinite, since deal is leaking memory every pass of the loop...

• You assumed that the loop will receive a new iterator each time. It's a bad assumption. For example, deal starts at the wrong number the second and third pass of the outer loop in the following code:

  for (1..3) {
    while (deal [1..9] => my ($a,$b,$c) ){
      print $a,$b,$c;
      last;
    }
  }
  [download]

Just like you need to call keys before each, you'd need to reset the iterator before entering the loop. You'd need

init_deal my ($a,$b,$c)
while (deal [1..9] => ($a,$b,$c) ){
   ...
}
[download]

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