How do I... create a value type?

[Ingo Blechschmidt]

Hi,

  my $x = 42;
  my $y = $x;
  $y++;
  say $x;         # Still 42, of course


  class Foo {
    has $.data;
    method incr () { $.data++ }

    # Please fill in appropriate magic here
  }

  my Foo $x .= new(:data(42));
  my Foo $y  = $x;
  $y.incr();
  say $x.data;    # Should still be 42
  say $x =:= $y;  # Should be false


--Ingo

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