Re: [swift-evolution] [Pitch/Reality Check] Allow instance members as parameter default values

[Nate Cook via swift-evolution]

Oops, left out that there's this horrifying way of writing it right now:

extension Collection {
    func index(_ i: Index! = nil, offsetBy n: IndexDistance) -> Index {
        let i = i ?? startIndex
        // ...
    }
}

Nobody wants that.


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