[swift-evolution] Swift 3.1 vs Swift 4

[Erica Sadun]

Will there be a door of opportunity to propose for Swift 3.1 rather than Swift 4 after 8/1? I've been sitting on `sequence(first, next, while)`  (https://github.com/erica/swift/tree/unfold, https://bugs.swift.org/browse/SR-2065) because it's additive. I think it will do a lot to ameliorate the ill-will raised by SE-0007 <https://github.com/apple/swift-evolution/blob/master/proposals/0007-remove-c-style-for-loops.md>. 

Thanks for any guidance.

-- E

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