gistfile1.txt

$ cat T.pl
use v6;

class C {
    method foo_hr (IO:D $in, Int $off = 0, Bool :$meta = True) {
        return self.foo($in, $off, :$meta, hr => True);
        }

    method foo (IO:D $in, Int $off is copy = 0, Bool :$meta = True, Bool :$hr = False) {
        return True;
        }
    }

C.new.foo.say($*IN);
$ Too few positionals passed; expected 2 or 3 arguments but got 1
  in method foo at T.pl:8
  in block <unit> at T.pl:13