"Coroutines (Gor Nishanov) was adopted for C++20. A number of other authors that have their own coroutine proposals have also done great work to give feedback t

"Coroutines (Gor Nishanov) was adopted for C++20. A number of other authors that have their own coroutine proposals have also done great work to give feedback to this design and inform the committee in the process of showing their own designs, and the adopted coroutines design is expected to adopt some of their additional programming capabilities in the future as well as we continue to build on it after C++20. At this meeting, we had many detailed design discussions, including notably these papers that will be available in a few weeks when the post-meeting mailing is posted: a unified consensus report from all coroutines proposers describing the strengths and weaknesses of all their proposals, and a consensus report from implementers from all major C++ compilers about the tradeoffs and feasibility of the basic facilities required by the various coroutines proposals. Both of these papers are very educational and highly recommended." https://herbsutter.com/2019/02/23/trip-report-winter-iso-c-standards-meeting-kona/ https://herbsutter.com/2019/02/23/trip-report-winter-iso-c-s... The papers aren't available yet but presumably will explain the reasoning behind accepting them in their current form.