what_am_i_doing_wrong?

use v6;
my Any $o;
my Code $m;

class Foo {
  has Int $.counter = 0;
  our method bar(){
    $.counter++;
    say "bar $.counter times called";
  };
};

my $f = Foo.new();
$o = $f;
$m = &Foo::bar;
$o.$m();