∀ {B : Type u₁} [inst : CategoryTheory.Bicategory B] {C : Type u₂} [inst_1 : CategoryTheory.Bicategory C]
  (F : CategoryTheory.Pseudofunctor B C) {a b : B} (f : a ⟶ b),
  CategoryTheory.Bicategory.whiskerRightIso (F.mapId a) (F.map f) =
    (F.mapComp (CategoryTheory.CategoryStruct.id a) f).symm ≪≫
      F.map₂Iso (CategoryTheory.Bicategory.leftUnitor f) ≪≫ (CategoryTheory.Bicategory.leftUnitor (F.map f)).symm