{motive : Lean.Meta.Grind.IntroResult✝ → Sort u} →
  (t : Lean.Meta.Grind.IntroResult✝¹) →
    Lean.Meta.Grind.IntroResult.ctorIdx✝ t = 0 →
      ((goal : Lean.Meta.Grind.Goal) → motive (Lean.Meta.Grind.IntroResult.done✝ goal)) → motive t