proposition: Lemma unit_r_pure (A : Type) : unit_r ⩯ @pure _ _ (A + void) A unit_r.
proof: Proof. intros [|[]]. reflexivity. Qed.
imports: Coq(Program Setoid Morphisms RelationClasses) ExtLib(Structures.Monad) ITree(Basics.Basics Basics.Category Basics.Monad Basics.CategoryFunctor Basics.CategoryKleisli Basics.Function)