fixed issue-144: just using std::movable

[dietmarkuehl]

No description provided.

[github-actions]

Remaining comments which cannot be posted as a review comment to avoid GitHub Rate Limit

pre-commit

---

[pre-commit] _{reported by reviewdog 🐶}

execution/tests/beman/execution/stoptoken-concepts.test.cpp

Lines 186 to 187 in 2d226fa

	static_assert(not ::test_std::stoppable_token<::unstoppable_token::token<false, false>>);
	static_assert(not ::test_std::unstoppable_token<::unstoppable_token::token<false, false>>);

---

[pre-commit] _{reported by reviewdog 🐶}

execution/tests/beman/execution/stoptoken-concepts.test.cpp

Line 189 in 2d226fa

static_assert(not ::test_std::unstoppable_token<::unstoppable_token::token<true, true>>);

---

[pre-commit] _{reported by reviewdog 🐶}

execution/tests/beman/execution/stoptoken-concepts.test.cpp

Lines 231 to 239 in 2d226fa

	static_assert(
	not ::test_detail::stoppable_source<::stoppable_source::source<false, bool, true, bool, true, bool>>);
	static_assert(not ::test_detail::stoppable_source<::stoppable_source::source<true, int, true, bool, true, bool>>);
	static_assert(
	not ::test_detail::stoppable_source<::stoppable_source::source<true, bool, false, bool, true, bool>>);
	static_assert(not ::test_detail::stoppable_source<::stoppable_source::source<true, bool, true, int, true, bool>>);
	static_assert(
	not ::test_detail::stoppable_source<::stoppable_source::source<true, bool, true, bool, false, bool>>);
	static_assert(not ::test_detail::stoppable_source<::stoppable_source::source<true, bool, true, bool, true, int>>);

---

[pre-commit] _{reported by reviewdog 🐶}

execution/tests/beman/execution/thread-stoptoken-syn.compile.test.cpp

Lines 24 to 25 in 2d226fa

	static_assert((not ::test_detail::stoppable_callback_for<int, int, int>));
	static_assert((not ::test_detail::stoppable_source<int>));

---

[pre-commit] _{reported by reviewdog 🐶}

execution/tests/beman/execution/thread-stoptoken-syn.compile.test.cpp

Lines 27 to 28 in 2d226fa

	static_assert((not ::test_std::stoppable_token<int>));
	static_assert((not ::test_std::unstoppable_token<int>));