class Dog {
    has Str $.name;

    method bark(Dog:D: Int:D $x) {
        say self.^name;
        say "bark" for 1..$x;       
    }
}

Dog.bark(3);

--output:--
Invocant of method 'bark' must be an object instance of type 'Dog', not
a type object of type 'Dog'.  Did you forget a '.new'?
  in method bark at b.raku line 30
  in block <unit> at b.raku line 36