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Returns an awaitable object that may be used to reset the cancellation state of the current coroutine.
template<
    typename Filter>
constexpr unspecified reset_cancellation_state(
    Filter && filter);
          Let P be the cancellation slot associated with the current
          coroutine's co\_spawn completion handler. Assigns a new cancellation_state
          object S, constructed as S(P, std::forward<Filter>(filter)),
          into the current coroutine's cancellation state object.
        
boost::asio::awaitable<void> my_coroutine()
{
  co_await boost::asio::this_coro::reset_cancellation_state(
      boost::asio::enable_partial_cancellation());
  // ...
}
          The cancellation state is shared by all coroutines in the same "thread
          of execution" that was created using co_spawn.