[swift-evolution] [Proposal] Allow upgrading weak self to strong self by assignment

[Taras Zakharko]

Very much in favor of this solution (removing the standalone let self = self!). Its does not introduce any new syntax, its semantics is very obvious, its explicit, and its also much more flexible than the alternative guard capture list proposal while keeping magic to the necessary minimum. 

— Taras

> On 19 Feb 2016, at 20:40, Evan Maloney via swift-evolution <swift-evolution at swift.org> wrote:
> 
>> On Feb 19, 2016, at 2:30 PM, plx via swift-evolution <swift-evolution at swift.org <mailto:swift-evolution at swift.org>> wrote:
>>> networkRequest.fetchData() { [weak self] result in
>>>     guard self != nil else { return }
>>> 
>>>     let self = self!
>> …isn’t there a race condition in this example (admittedly an *unlikely* one in most settings, but still…)?
> 
> Yes, that's a good point.
> 
> Now that I think about it, allowing a standalone `let self =` could never be implemented in a way *guaranteed* to avoid a race condition, so perhaps I should remove it from the proposal altogether.
> 
> When I incorporate the next round of feedback, I'll rework the proposal to indicate that it can only be used with `if let` or `guard let`.
> 
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