proposition: Lemma functor_category_has_homsets (C : precategory_data) (D : precategory) (hs: has_homsets D): has_homsets [C, D, hs].
proof: Proof. intros F G. apply isaset_nat_trans. apply hs. Defined.
imports: UniMath.Foundations.Propositions UniMath.MoreFoundations.Tactics UniMath.MoreFoundations.Univalence UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Isos UniMath.CategoryTheory.Core.TransportMorphisms UniMath.CategoryTheory.Core.Functors UniMath.CategoryTheory.Core.NaturalTransformations UniMath.CategoryTheory.Core.Univalence