Upgrade code to be able to build with Swift 5. #239
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@autoclosurebehavior has changed in-swift-version 5, but in the impacted code in this pull request no laziness is lost when forwarding one autoclosure as an argument to a function taking another. When forwarding, a new autoclosure is conceptually created, thus delaying the actual evaluation of the captured logic.Thanks to @slavapestov and @rjmccall for pointing this out.