This is not a language extension, it is a pure library feature. C++ has had async/await for a while, so it is perfectly suited for that; sender/receivers build on top of that functionality.

In any case, Eric Niebler now works at NVidia, which has expressed an interest on Senders/Receivers as they are not just for networking, but a general mechanism for composition of async operations.

I still have my concerns, as I think the heavily templating will come at a cost of clarity, but I haven't tried them on a large application yet.