###
### closure-example
###

## Chapter 3 section 5.2

sub make_counter {
  my $n = shift;
  return sub { print "n is ", $n++ };
}

my $x = make_counter(7);
my $y = make_counter(20);
$x->();  $x->();  $x->();
$y->();  $y->();  $y->();
$x->();