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sub func {
   ...
...
      return func(...);
   }
}

sub func {
   ...
   return func(...);
}

use constant SQRT_EPSILON  => 0.0001;
use constant SQRT_MAX_ITER => 50;
...

   return $guess;
}

sub in_order_visit {
   my ($node, $visitor) = @_;
...
   $visitor->($node);
   in_order_visit($node->right(), $visitor);
}

sub in_order_visit {
   my ($node, $visitor) = @_;
...
      }
   }
}