fact: Definition inr : Functor D (C + D) := Build_Functor D (C + D) (@inr _ _) (fun _ _ m => m) (fun _ _ _ _ _ => idpath) (fun _ => idpath).
imports: Category.Sum Functor.Core Functor.Composition.Core Functor.Identity Functor.Paths HoTT.Tactics Types.Forall Basics.Tactics