(motive : Lean.MVarId × Mathlib.Tactic.ITauto.IProp → Sort u_1) →
  (__discr : Lean.MVarId × Mathlib.Tactic.ITauto.IProp) →
    ((g : Lean.MVarId) → (t : Mathlib.Tactic.ITauto.IProp) → motive (g, t)) → motive __discr