Proposal Link:
https://github.com/apple/swift-evolution/blob/master/proposals/0159-fix-private-access-levels.md
<https://github.com/apple/swift-evolution/blob/master/proposals/0159-fix-private-access-levels.md>
The review of ran from March 20...27, 2017. The proposal has been *rejected*.
The core team had a lengthy discussion of this proposal as well as related
ideas that came up during (and prior to) the review [*].
SE-0159
<https://github.com/apple/swift-evolution/blob/master/proposals/0159-fix-private-access-levels.md>
specifically sought to revert the main user-facing part of SE-0025
<https://github.com/apple/swift-evolution/blob/master/proposals/0025-scoped-access-level.md>,
which gave “private” lexical-scoping semantics and introduced “fileprivate”.
The core team felt that there was sufficient evidence that
more-restrictive-than-fileprivate access control is in use within the Swift
community and in established patterns, such that it would be harmful to remove
the functionality introduced by SE-0025
<https://github.com/apple/swift-evolution/blob/master/proposals/0025-scoped-access-level.md>
at this point.
The core team discussed the idea of renaming to keywords that was brought up in
the thread as a way to address many of the concerns raised in SE-0159
<https://github.com/apple/swift-evolution/blob/master/proposals/0159-fix-private-access-levels.md>
while providing the same language semantics. Specifically:
* “private” -> “scoped”
* “fileprivate” -> “private”
The core team determined that such a change, while (technically) easy to
automatically migrate, would introduce far too much churn in Swift code bases
moving from Swift 3 to Swift 4, compromising the source stability goals set out
for Swift 4.
Finally, the core team discussed a different potential design for “private”
that admits a limited form of type-based access control within files. We will
open a separate discussion thread on Swift Evolution, with the subject
"Type-based ‘private’ access within a file", and are seeking further discussion
there and a motivated volunteer to turn it into a new proposal for Swift 4.
- Doug Gregor
Review Manager
[*] Big thanks to Alex Martini for his excellent notes._______________________________________________
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