(motive : Option (Lean.Expr × Lean.Expr) → Sort u_1) →
  (__discr : Option (Lean.Expr × Lean.Expr)) →
    ((val tp : Lean.Expr) → motive (some (val, tp))) →
      ((x : Option (Lean.Expr × Lean.Expr)) → motive x) → motive __discr