import Lean

open Lean

structure S1 :=
(x y : Nat)

structure S2 extends S1 :=
(z : Nat)

structure S3 :=
(w : Nat)

structure S4 extends S2, S3 :=
(s : Nat)

def check (b : Bool) : CoreM Unit :=
unless b do throwError "check failed"

class S5 :=
(x y : Nat)

inductive D
| mk (x y z : Nat) : D

def tst : CoreM Unit :=
do let env ← getEnv;
   IO.println (getStructureFields env `Lean.Environment);
   check $ getStructureFields env `S4 == #[`toS2, `toS3, `s];
   check $ getStructureFields env `S1 == #[`x, `y];
   check $ isSubobjectField? env `S4 `toS2 == some `S2;
   check $ getParentStructures env `S4 == #[`S2, `S3];
   check $ findField? env `S4 `x == some `S1;
   check $ findField? env `S4 `x1 == none;
   check $ isStructure env `S1;
   check $ isStructure env `S2;
   check $ isStructure env `S3;
   check $ isStructure env `S4;
   check $ isStructure env `S5;
   check $ !isStructure env `Nat;
   check $ !isStructure env `D;
   IO.println (getStructureFieldsFlattened env `S4);
   IO.println (getStructureFields env `D);
   IO.println (getPathToBaseStructure? env `S1 `S4);
   check $ getPathToBaseStructure? env `S1 `S4 == some [`S4.toS2, `S2.toS1];
   pure ()

#eval tst