(motive : Lean.Meta.CongrArgKind → Sort u_1) →
  (k : Lean.Meta.CongrArgKind) →
    (Unit → motive Lean.Meta.CongrArgKind.fixed) →
      (Unit → motive Lean.Meta.CongrArgKind.eq) → ((x : Lean.Meta.CongrArgKind) → motive x) → motive k