∀ {R : Type u_2} {M M₁ : Type u_1} [inst : Semiring R] [inst_1 : AddCommMonoid M] [inst_2 : Module R M]
  [inst_3 : AddCommMonoid M₁] [inst_4 : Module R M₁] (motive : Nonempty (M ≃ₗ[R] M₁) → Prop)
  (x : Nonempty (M ≃ₗ[R] M₁)), (∀ (h : M ≃ₗ[R] M₁), motive ⋯) → motive x