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(FWIW, I just pushed a fix for this bug.)

EDIT: To be clear, addressing these kinds of issues is something we've been aggressively pursuing for Swift 3, and will continue to do so.

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Nice commit message:

https://github.com/apple/swift/commit/2cdd7d64e1e2add7bcfd54...

Is this construct commonly used in swift or is it an edge case? I've seen people referring to it as an edge case, but at the same time this is code which I find my self writing pretty often in other languages, for example when initializing data for unit tests.

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