∀ {w : ℕ} (lw lstart : ℕ) (lexpr : Std.Tactic.BVDecide.BVExpr lw) (op : Std.Tactic.BVDecide.BVUnOp)
  (operand : Std.Tactic.BVDecide.BVExpr w),
  ¬Std.Tactic.BVDecide.BVExpr.extract lstart w lexpr = Std.Tactic.BVDecide.BVExpr.un op operand