-- iteration 9b: ref + backlink navigation. `e.dept.name` chains a ref to
-- its target row (a point read); `d.staff` reads a backlink by probing the
-- source class's index — both execute in the engine, no join written.
@table(name: "dept", index: [name])
class Dept {
  name: Text
  staff: backlink Emp.dept
}
@table(name: "emp", index: [dept])
class Emp {
  name: Text
  dept: ref Dept
}
fn main() {
  let eng = insert Dept { name: "eng" }
  let ops = insert Dept { name: "ops" }
  insert Emp { name: "asha", dept: eng }
  insert Emp { name: "bram", dept: eng }
  insert Emp { name: "dora", dept: ops }
  print("-- forward (e.dept.name):")
  for e in from x in Emp select x {
    print(e.dept.name)
  }
  print("-- backward (d.staff):")
  for d in from x in Dept where x.name == "eng" select x {
    for s in from y in d.staff select y {
      print(s.name)
    }
  }
}