proposition: Lemma empty_o : forall {T:Type} k, IntMap.get' k (IntMap.empty T) = None.
proof: Proof. reflexivity. Qed.
imports: Cdcl.PatriciaR Cdcl.KeyInt Cdcl.ReifClasses Cdcl.Lib Bool Setoid ZifyBool ZArith Uint63 Lia List Cdcl.Syntax Cdcl.Clause