-- iteration 9b: deleting a row a `ref` still points at traps WO_T_FK
-- (restrict). Uncaught here: the trap code (11) is the assertion.
@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 d = insert Dept { name: "eng" }
  insert Emp { name: "asha", dept: d }
  let ds = from x in Dept where x.name == "eng" take 1 select x
  delete ds[0]
}