{M : Type u_1} →
  {X : Type u_2} →
    [inst : VAdd M X] →
      [inst_1 : TopologicalSpace X] →
        {motive : ProperConstVAdd M X → Sort u} →
          (t : ProperConstVAdd M X) →
            ((isProperMap_vadd : ∀ (c : M), IsProperMap fun x => c +ᵥ x) → motive ⋯) → motive t