Tomorrow we will be temporarily bringing down the CI, starting around 2 PM, California time, in order to upgrade to the latest beta of Xcode 8 and the associated SDKs. We will also be locking master while we land some source changes in support of the updated SDKs on both master and the swift-3.0-branch. We expect the upgrade process to take several hours. We’ll send out a message when the upgrade is complete.
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. The latest Xcode 8 beta can be downloaded at: https://developer.apple.com/download/
Also, please note, we will not be branching again for Swift 3: the swift-3.0-branch branch will be our final preview and release branch for the Swift 3 release, and will be used to converge the Swift 3 release from now until it is declared ‘GM'. Any changes that are required for Swift 3 should be nominated for inclusion via pull request against the swift-3.0-branch branch.