My two cents

[Kagamin]

On Friday, 20 October 2017 at 09:49:34 UTC, Adam Wilson wrote:
> Others are less obvious, for example, async/await is syntax 
> sugar for a collection of Task-based idioms in C#.

Now I think it's doesn't fit D. async/await wasn't made for 
performance, but for conservation of thread resources, async 
calls are rather expensive, which doesn't fit in D if we prefer 
raw performance. Also I found another shortcoming: it doesn't 
interoperate well with cache: cache flip flops between 
synchronous and asynchronous operation: when you hit cache it's 
synchronous, when you miss it it performs IO.