[swift-evolution] Optional Setting

[Brent Royal-Gordon]

> I think that the existing syntax for “??” handles this need fairly well without requiring an additional assignment operator:
> 
> 	a = a ?? []

When the variable is `a`, sure. When it’s `scoreboardViewController.selectedScoreboard`, not so much.

+1 from me, though I prefer the `??=` spelling to match the `??` operator more closely.

-- 
Brent Royal-Gordon
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