fact: Definition setcategory_refl_idtoiso {C : setcategory} {x : C} (p : x = x) : pr1 (idtoiso p) = identity _.
imports: UniMath.Foundations.All UniMath.MoreFoundations.All UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Univalence UniMath.CategoryTheory.Core.Isos UniMath.CategoryTheory.Core.Functors