{motive : Lean.Meta.Sym.IntrosResult → Sort u} →
  motive Lean.Meta.Sym.IntrosResult.failed →
    ((newDecls : Array Lean.FVarId) →
        (mvarId : Lean.MVarId) → motive (Lean.Meta.Sym.IntrosResult.goal newDecls mvarId)) →
      (t : Lean.Meta.Sym.IntrosResult) → motive t