[swift-evolution] [Proposal Update 1] A simplified notation for avoiding the weak/strong dance with closure capture lists

[Brent Royal-Gordon]

> Alternatives Considered
> 
> Status Quo
> 
> Closures with an Optional Return Type
> 
> Closures with a Bool Return Type
> 
> Closures with Arbitrary Return Types

I would also discuss the alternative of allowing `self` to be shadowed so that you could write `guard let self = self else { return }`. Your proposal still has some advantages over that one, but I would like to see those explicitly called out and discussed.

-- 
Brent Royal-Gordon
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