Tomorrow we will be bringing down the CI temporarily starting around 10 AM, California time, to upgrade to the latest beta of Xcode 8 and the associated SDKs. We will also be landing some source changes required for the SDK update for Swift 3. We expect the upgrade process to take several hours. We’ll send out a message when the upgrade is complete.
At this time, we will also be cutting a swift-3.0-preview-3-branch.
As a reminder, once the upgrade is complete, if you are doing development on a Mac, the minimum required Xcode to build Swift from source will be the latest Xcode 8 beta.