∀ {B : Type u₁} [inst : CategoryTheory.Bicategory B] {C : Type u₂} [inst_1 : CategoryTheory.Bicategory C]
  (F : CategoryTheory.LaxFunctor B C) {a b : B} (f : a ⟶ b) {Z : F.obj a ⟶ F.obj b} (h : F.map f ⟶ Z),
  CategoryTheory.CategoryStruct.comp (CategoryTheory.Bicategory.rightUnitor (F.map f)).hom h =
    CategoryTheory.CategoryStruct.comp (CategoryTheory.Bicategory.whiskerLeft (F.map f) (F.mapId b))
      (CategoryTheory.CategoryStruct.comp (F.mapComp f (CategoryTheory.CategoryStruct.id b))
        (CategoryTheory.CategoryStruct.comp (F.map₂ (CategoryTheory.Bicategory.rightUnitor f).hom) h))