[swift-dev] [Swift 2.2] Request to merge SE-0022: #selector expression

[Ted Kremenek]

Approved for Swift 2.2.

I have created a pull request to track integration:

  https://github.com/apple/swift/pull/1170

> On Feb 2, 2016, at 9:06 AM, Douglas Gregor <dgregor at apple.com> wrote:
> 
> Hi Ted,
> 
> I’d like to pull the implementation of the Objective-C #selector expression into the Swift 2.2 branch:
> 
> 	https://github.com/apple/swift-evolution/blob/master/proposals/0022-objc-selectors.md <https://github.com/apple/swift-evolution/blob/master/proposals/0022-objc-selectors.md>
> 
> The actual implementation is in a number of commits that can be cherry-picked:
> 
> 	https://github.com/apple/swift/commit/dccf3155f1fe5400df0c9b51f21a3b8f7fa09b9c <https://github.com/apple/swift/commit/dccf3155f1fe5400df0c9b51f21a3b8f7fa09b9c>
> 	https://github.com/apple/swift/commit/7c0e087cd514c926d9eaa3082679edff626effc8 <https://github.com/apple/swift/commit/7c0e087cd514c926d9eaa3082679edff626effc8>
> 	https://github.com/apple/swift/commit/89834f8d5fcce652401ecaeec4addace48cb2fae <https://github.com/apple/swift/commit/89834f8d5fcce652401ecaeec4addace48cb2fae>
> 	https://github.com/apple/swift/commit/f7407f6a4d2c9b20ef1d2aab6dbaff5f9419aa88 <https://github.com/apple/swift/commit/f7407f6a4d2c9b20ef1d2aab6dbaff5f9419aa88>
> 	https://github.com/apple/swift/commit/00313a1e7ec4934a1df12541b9a8f2683f28ed67 <https://github.com/apple/swift/commit/00313a1e7ec4934a1df12541b9a8f2683f28ed67>
> 	https://github.com/apple/swift/commit/1a830fa541705594bd4b3936de24a20b5b943059 <https://github.com/apple/swift/commit/1a830fa541705594bd4b3936de24a20b5b943059>
> 	https://github.com/apple/swift/commit/2a42664129d7e95d182a91858fb268e50373b68b <https://github.com/apple/swift/commit/2a42664129d7e95d182a91858fb268e50373b68b>
> 	https://github.com/apple/swift/commit/37441e1b46cd97d42161455dd712d17ce2ccfe87 <https://github.com/apple/swift/commit/37441e1b46cd97d42161455dd712d17ce2ccfe87>
> 	https://github.com/apple/swift/commit/0a359424d7d5bd31c9e7a2f98c15cd9a1fa40328 <https://github.com/apple/swift/commit/0a359424d7d5bd31c9e7a2f98c15cd9a1fa40328>
> 	https://github.com/apple/swift/commit/9a0241bb3bcdde3531d0ba683e8d6668c50c9f58 <https://github.com/apple/swift/commit/9a0241bb3bcdde3531d0ba683e8d6668c50c9f58>
> 	https://github.com/apple/swift/commit/dda35e8c4290d3b941b7ea12b40b87e2590a5332 <https://github.com/apple/swift/commit/dda35e8c4290d3b941b7ea12b40b87e2590a5332>
> 	https://github.com/apple/swift/commit/5726e7a329128fdf67a31f1c40df8c8db2698aec <https://github.com/apple/swift/commit/5726e7a329128fdf67a31f1c40df8c8db2698aec>
> 
> This proposal contains both a new feature (the #selector expression) and the deprecation of an existing feature (treating a string literal as a Selector). Our intent is to use 2.2 to start migrating existing clients over to the new syntax, which will become far more important with The Grand Renaming in Swift 3.
> 
> There is risk here, of course: I changed the way we emit Objective-C selector references a bit, and the Fix-It code for translating uses of string-literals-as-selectors is non-trivial and makes use of another new feature (SE-0021, compound names). That said, I’m not overly concerned about new problems being introduced by this code. I’d love to see better code completion for compound names, but haven’t figured out a good way to do it yet.
> 
> 	- Doug
> 

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