∀ {M : Type u_1} [inst : Monoid M] {N : Type u_2} [inst_1 : Monoid N] {φ : M →* N} {R : Type u_10} [inst_2 : Semiring R]
  [inst_3 : MulSemiringAction M R] {S : Type u_12} [inst_4 : Semiring S] [inst_5 : MulSemiringAction N S]
  [inst_6 : SizeOf M] [inst_7 : SizeOf N] [inst_8 : SizeOf R] [inst_9 : SizeOf S] (toDistribMulActionHom : R →ₑ+[φ] S)
  (map_one' : toDistribMulActionHom.toFun 1 = 1)
  (map_mul' :
    ∀ (x y : R), toDistribMulActionHom.toFun (x * y) = toDistribMulActionHom.toFun x * toDistribMulActionHom.toFun y),
  sizeOf { toDistribMulActionHom := toDistribMulActionHom, map_one' := map_one', map_mul' := map_mul' } =
    1 + sizeOf toDistribMulActionHom + sizeOf map_one'