∀ {C : Type uC} [inst : CategoryTheory.Category.{uC', uC} C] [inst_1 : CategoryTheory.Limits.HasZeroMorphisms C]
  (X Y : C) [inst_2 : CategoryTheory.Limits.HasBinaryBiproduct X Y],
  CategoryTheory.IsIso CategoryTheory.Limits.biprod.inl ↔
    CategoryTheory.CategoryStruct.id (X ⊞ Y) =
      CategoryTheory.CategoryStruct.comp CategoryTheory.Limits.biprod.fst CategoryTheory.Limits.biprod.inl