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sub fibonacci {
   my ($visitor) = @_;
...
      ($i, $j) = ($j, $i+$j);
   }
}

sub fibonacci {
   my ($visitor) = @_;
...
   $visitor->() for $j;
   _fibonacci($j, $i+$j);
}

sub fibonacci {
   my ($i, $j) = (0, 1);
...
   my ($i, $j) = @_;
   return ( \$j, sub { _fibonacci($j, $i+$j) } );
}

{
   my $iter = make_iter(\&fibonacci);
...
   }
   print("\n");
}

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