∀ {α : Type u_1} (motive : Stream'.WSeq α ⊕ Computation (Stream'.WSeq α) → Sort u_2) (s : Stream'.WSeq α)
  (h_1 : (s : Stream'.WSeq α) → motive (Sum.inl s)) (h_2 : (c' : Computation (Stream'.WSeq α)) → motive (Sum.inr c')),
  (match Sum.inl s with
    | Sum.inl s => h_1 s
    | Sum.inr c' => h_2 c') =
    h_1 s