use nqp;
class A { has num $.foo; has num $.baz };
class B { has str $!bar };
class C is A is B {
  method new(Num $a, Str $b) {
    my \SELF = nqp::create(self);
    nqp::bindattr_n(SELF, A, '$!foo', nqp::unbox_n($a));
    nqp::bindattr_n(SELF, A, '$!baz', nqp::unbox_n($a));
    nqp::bindattr_s(SELF, B, '$!bar', nqp::unbox_s($b));
    SELF
  }
};
C.new(5e0, "5").foo.WHAT.say