Swift 5.5 Release Process

[stevapple (YR Chen)]

I suggest you read the Swift Concurrency Roadmap. There is actually a full description of which concurrency features will land in Swift 5:

@Ben_Cohen

In the first phase, we intend to preserve Swift's current default behavior: global variables and class component memory are not protected from data races. "Actor unsafe" is therefore the default for this memory. Because this is the default of current Swift, enabling this first phase is non-source breaking .

As the roadmap points out, all the features placed in the first phase will be non-source breaking and possible to go into Swift 5.