{F : Type u_1} →
  {K : Type u_3} →
    [inst : CommRing F] →
      [inst_1 : Ring K] →
        [inst_2 : Algebra F K] →
          {motive : Algebra.IsSeparable F K → Sort u} →
            (t : Algebra.IsSeparable F K) → ((isSeparable' : ∀ (x : K), IsSeparable F x) → motive ⋯) → motive t