(motive : Option (Lean.Expr × Lean.Expr × Lean.Expr) → Sort u_1) →
  (__discr : Option (Lean.Expr × Lean.Expr × Lean.Expr)) →
    ((t l r : Lean.Expr) → motive (some (t, l, r))) →
      ((x : Option (Lean.Expr × Lean.Expr × Lean.Expr)) → motive x) → motive __discr