[swift-evolution] [Pitch] Move @noescape

[Chris Lattner]

> On Mar 3, 2016, at 4:10 PM, Chris Lattner via swift-evolution <swift-evolution at swift.org> wrote:
> 
> 
>> On Mar 3, 2016, at 2:14 PM, Jacob Bandes-Storch <jtbandes at gmail.com <mailto:jtbandes at gmail.com>> wrote:
>> 
>> Will this allow me to write "let myDispatchSync = dispatch_sync as! @noescape () -> Void"  ? :-D
> 
> Yes,  but you need to spell it like this:
> 
> 	let myDispatchSync = dispatch_sync as! ((dispatch_queue_t, @noescape @convention(block) () -> ()) -> Void)

Ah, while this syntactically parses, but the cast is considered to fail at runtime given that it is not a safe conversion.  This is the domain of an unsafe cast.

-Chris
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