[swift-evolution] New async keyword usage

[Trevör ANNE DENISE]

Hello Swift community,

I was really interested by the recent Task-based concurrency manifesto and Concrete proposal for async semantics in Swift.

Looking at beginAsync() and Futures, I had an idea for a new syntax based on the `async` keyword, I'd love to hear your feedback about this idea:
https://github.com/adtrevor/Swift-ideas/blob/master/New%20async%20keyword%20usage.md <https://github.com/adtrevor/Swift-ideas/blob/master/New%20async%20keyword%20usage.md>

Would such a syntax make any sense?

Thank you ! :)


Trevör
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