∀ {B : Type u₁} [inst : CategoryTheory.Bicategory B] {C : Type u₂} [inst_1 : CategoryTheory.Bicategory C]
  (self : CategoryTheory.StrictlyUnitaryPseudofunctorCore B C) {a b : B} (f : a ⟶ b),
  self.map₂ (CategoryTheory.Bicategory.leftUnitor f).hom =
    CategoryTheory.CategoryStruct.comp (self.mapComp (CategoryTheory.CategoryStruct.id a) f).hom
      (CategoryTheory.CategoryStruct.comp (CategoryTheory.eqToHom ⋯)
        (CategoryTheory.Bicategory.leftUnitor (self.map f)).hom)