Method exist

sources/debugger.cpp:229–235

	}

	bool exist(std::size_t line_num) const
	{
		for (auto &b : m_breakpoints)
			if (b.data.index() == 0 && std::get<std::size_t>(b.data) == line_num)
				return true;
		return false;
	}

	void list() const
	{