{motive : Lean.Elab.Tactic.ElabSimpArgResult → Sort u} →
  (t : Lean.Elab.Tactic.ElabSimpArgResult) →
    t.ctorIdx = 1 →
      ((«simproc» : Lean.Name) →
          (post : Bool) → motive (Lean.Elab.Tactic.ElabSimpArgResult.addSimproc «simproc» post)) →
        motive t