{ε : Type u} →
  {α : Type v} →
    {motive_1 : IO.AsyncList ε α → Sort u_1} →
      (t : IO.AsyncList ε α) →
        t.ctorIdx = 1 →
          ((tl : Lean.Server.ServerTask (Except ε (IO.AsyncList ε α))) → motive_1 (IO.AsyncList.delayed tl)) →
            motive_1 t