• https://bugs.swift.org/browse/SR-4981
• https://github.com/apple/swift-source-compat-suite/blob/master/projects.json
• https://swift.org/source-compatibility
• Questions about expectations from swift source compatibility maintainers: https://github.com/apple/swift-source-compat-suite/pull/98

Leave a review on iTunes and join http://spectrum.chat/specfm/swift-unwrapped