∀ {R S T : Type u} [inst : Semiring R] [inst_1 : Semiring S] [inst_2 : Semiring T] (f : R →+* S) (g : S →+* T),
  SemiRingCat.ofHom (g.comp f) = CategoryTheory.CategoryStruct.comp (SemiRingCat.ofHom f) (SemiRingCat.ofHom g)