(motive : Lean.EnvExtension.AsyncMode → Sort u_1) →
  (asyncMode : Lean.EnvExtension.AsyncMode) →
    (Unit → motive Lean.EnvExtension.AsyncMode.mainOnly) →
      (Unit → motive Lean.EnvExtension.AsyncMode.local) →
        ((x : Lean.EnvExtension.AsyncMode) → motive x) → motive asyncMode