My two cents

[Paulo Pinto]

On Tuesday, 24 October 2017 at 16:02:56 UTC, flamencofantasy 
wrote:
> On Tuesday, 24 October 2017 at 05:40:06 UTC, Dmitry Olshansky 
> wrote:
>> On Tuesday, 24 October 2017 at 04:26:42 UTC, Adam Wilson wrote:
>>>[...]
>>
>> I’ll throw in my 2 rubbles.
>>
>> I actually worked on a VM that has async/await feature 
>> built-in (Dart language).
>> It is a plain syntax sugar for Future/Promise explicit 
>> asynchrony where async automatically return Future[T] or 
>> Observable[T] (the latter is async stream).
>>
>> [...]
>
> This is exactly what async/await in C# does.
> I saw this idea in Jeffry Richter's Power Threading library 
> (https://github.com/Wintellect/PowerThreading) sometime in the 
> mid/late 2000, where he used the C# 'yield' keyword to generate 
> the state machine code. When async/await was added MSFT either 
> took his idea directly or at the very least got inspired by it.

Async/await was based on Midori's project related work.

http://joeduffyblog.com/2015/11/19/asynchronous-everything/

--
Paulo