Structured concurrency proposal for C++20

[Volkan Yazıcı]

[Quoting from Trio from post
<https://trio.discourse.group/t/structured-concurrency-proposal-for-c-20/125>
.]

"There’s a really interesting proposal under consideration for C++20,
that’s highly relevant to us here: https://wg21.link/p0660 (PDF), draft
implementation <https://github.com/josuttis/jthread>. According to Herb
Sutter
<https://herbsutter.com/2019/02/23/trip-report-winter-iso-c-standards-meeting-kona/>,
the proposal is “design-approved”, and the hope is that the exact wording
will be formally approved in July."