(motive : Option (Lean.Expr × Lean.Expr × Lean.Expr × Lean.Expr) → Sort u_1) →
  (x : Option (Lean.Expr × Lean.Expr × Lean.Expr × Lean.Expr)) →
    ((fst lhs fst_1 rhs : Lean.Expr) → motive (some (fst, lhs, fst_1, rhs))) →
      ((x : Option (Lean.Expr × Lean.Expr × Lean.Expr × Lean.Expr)) → motive x) → motive x