∀ {C : Type u₁} [inst : CategoryTheory.Category.{v₁, u₁} C] [inst_1 : CategoryTheory.MonoidalCategory C]
  [inst_2 : CategoryTheory.Limits.HasCoequalizers C]
  [inst_3 :
    ∀ (X : C),
      CategoryTheory.Limits.PreservesColimitsOfSize.{0, 0, v₁, v₁, u₁, u₁}
        (CategoryTheory.MonoidalCategory.tensorLeft X)]
  [inst_4 :
    ∀ (X : C),
      CategoryTheory.Limits.PreservesColimitsOfSize.{0, 0, v₁, v₁, u₁, u₁}
        (CategoryTheory.MonoidalCategory.tensorRight X)]
  {X Y : CategoryTheory.Mon C} {M N : Bimod X Y} (f : M ⟶ N),
  Bimod.whiskerRight f (Bimod.regular Y) =
    CategoryTheory.CategoryStruct.comp M.rightUnitorBimod.hom
      (CategoryTheory.CategoryStruct.comp f N.rightUnitorBimod.inv)