fact: Record Pair := { c : C; x : object (F c) }.
imports: FunctorCategory.Morphisms Category.Core Functor.Core NaturalTransformation.Core Pseudofunctor.Core Pseudofunctor.RewriteLaws Category.Morphisms Cat.Morphisms Functor.Composition.Core Functor.Identity FunctorCategory.Core Basics Types HoTT.Tactics