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

Nate Cook natecook at gmail.com
Wed Feb 22 12:42:48 CST 2017

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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