[stoptoken.cons] - C++17 → C++20

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+#### Constructors, copy, and assignment <a id="stoptoken.cons">[[stoptoken.cons]]</a>
+``` cpp
+stop_token() noexcept;
+```
+*Ensures:* `stop_possible()` is `false` and `stop_requested()` is
+`false`.
+[*Note 1*: Because the created `stop_token` object can never receive a
+stop request, no resources are allocated for a stop
+state. — *end note*]
+``` cpp
+stop_token(const stop_token& rhs) noexcept;
+```
+*Ensures:* `*this == rhs` is `true`.
+[*Note 2*: `*this` and `rhs` share the ownership of the same stop
+state, if any. — *end note*]
+``` cpp
+stop_token(stop_token&& rhs) noexcept;
+```
+*Ensures:* `*this` contains the value of `rhs` prior to the start of
+construction and `rhs.stop_possible()` is `false`.
+``` cpp
+~stop_token();
+```
+*Effects:* Releases ownership of the stop state, if any.
+``` cpp
+stop_token& operator=(const stop_token& rhs) noexcept;
+```
+*Effects:* Equivalent to: `stop_token(rhs).swap(*this)`.
+*Returns:* `*this`.
+``` cpp
+stop_token& operator=(stop_token&& rhs) noexcept;
+```
+*Effects:* Equivalent to: `stop_token(std::move(rhs)).swap(*this)`.
+*Returns:* `*this`.
+``` cpp
+void swap(stop_token& rhs) noexcept;
+```
+*Effects:* Exchanges the values of `*this` and `rhs`.

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