So far there are only a handful of small breaking changes between -swift-version...

slavapestov on Sept 25, 2018 | parent | context | favorite | on: Swift 5.0 release process

So far there are only a handful of small breaking changes between -swift-version 4 and -swift-version 5 on the master branch. The only ones I can think of are a type safety hole getting plugged and some warnings for corner cases around access control that got promoted to errors.

coder543 on Sept 25, 2018 [–]

If that's the case, that's encouraging to hear.