{motive_1 : Lean.Elab.InfoTree → Sort u} →
  (t : Lean.Elab.InfoTree) →
    t.ctorIdx = 0 →
      ((i : Lean.Elab.PartialContextInfo) → (t : Lean.Elab.InfoTree) → motive_1 (Lean.Elab.InfoTree.context i t)) →
        motive_1 t