fact: Definition empty {E : Type -> Type} : void1 ~> itree E := fun _ e => match e : void1 _ with end.
imports: Coq(Morphisms) ITree(Basics.Basics Basics.Category Core.ITreeDefinition Eq.Eqit Eq.UpToTaus Indexed.Sum Indexed.Relation Interp.Interp Interp.Recursion)