∀ {B : Type u₁} {C : Type u₂} [inst : CategoryTheory.Bicategory B] [inst_1 : CategoryTheory.Bicategory.Strict B]
  [inst_2 : CategoryTheory.Bicategory C] (F : CategoryTheory.Pseudofunctor B C) {b₀ b₁ : B} (f : b₀ ⟶ b₁),
  F.mapComp' f (CategoryTheory.CategoryStruct.id b₁) f ⋯ =
    (CategoryTheory.Bicategory.rightUnitor (F.map f)).symm ≪≫
      CategoryTheory.Bicategory.whiskerLeftIso (F.map f) (F.mapId b₁).symm