[swift-evolution] Required Callback

[James Campbell]

​I'm not sure about that last question, I guess someone who knows more
about it than me could answer.​

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On 16 August 2016 at 23:37, James Campbell <james at supmenow.com> wrote:

> @noescape is a hint that the callback will only be called once and allows
> compiler to optimise, we may or may not be able to combine @required
> functionality into that but it looks like it was rejected for now.
>
> @required is a compiler hint / sanity check to enforce that the callback
> is actually called once by the developer. There is no focus on any compiler
> enhancements other than that.
> ​
>
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