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by manmal 3452 days ago
Swift 4 will be ABI stable, i.e. you will be able to use Swift 4 binaries with Swift 5. So, starting in September things will really settle down, or at least, upgrades are not a problem anymore. I guess that XCode will stay compatible with Swift 4+ for a long time in the future, and it might even mean that changes in Swift 5+ will only be additions, like blocks in Obj-C were.

UPDATE: Another comment here says that code compatibility is already fixed with Swift 3+.
1 comments
timjver 3452 days ago
Swift 3 code will be able to be used alongside Swift 4 code, in the future, but that's not to say that Swift 4 won't contain any breaking changes (it will).
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manmal 3452 days ago
Do you mean mixing 3 and 4 will work only if kept in separate source files?
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