The best description I know is https://www.hackingwithswift.com/articles/258/whats-new-in-swift-5-9 https://www.hackingwithswift.com/articles/258/whats-new-in-s

The best description I know is https://www.hackingwithswift.com/articles/258/whats-new-in-swift-5-9 https://www.hackingwithswift.com/articles/258/whats-new-in-s..., which refers to a few Swift Evolution docs: https://github.com/apple/swift-evolution/blob/main/proposals/0377-parameter-ownership-modifiers.md https://github.com/apple/swift-evolution/blob/main/proposals... https://github.com/apple/swift-evolution/blob/main/proposals/0366-move-function.md https://github.com/apple/swift-evolution/blob/main/proposals... https://github.com/apple/swift-evolution/blob/main/proposals/0390-noncopyable-structs-and-enums.md https://github.com/apple/swift-evolution/blob/main/proposals... The first is explicitly marked as “Implementation: Swift 5.9, without no-implicit-copy constraint”, but it seems the others also ¿partly? are in.