{M : Type u_2} →
  {α : Type u_3} →
    [inst : SMul M α] →
      [inst_1 : MeasurableSpace α] →
        {motive : MeasurableConstSMul M α → Sort u} →
          ((measurable_const_smul : ∀ (c : M), Measurable fun x => c • x) → motive ⋯) →
            (t : MeasurableConstSMul M α) → motive t