@d_date ご存知かもしれませんが、 Proposal の Status が "Awaiting implementation" になってます。 https://github.com/apple/swift への実装の PR との紐付けが必要かと。↓のように Proposal に Implementation の項目が必要です。 * Implementation: [apple/swift#13361](https://github.com/apple/swift/pull/13361) https://github.com/apple/swift-evolution/blob/master/proposals/0195-dynamic-member-lookup.md

After reflecting on the evolution process during both the Swift 3 and Swift 4 releases, the Core Team felt that we could strike a balance with not diluting attention from ABI stability while still enabling a broader range of proposals compared to Swift 4 by **requiring that all proposals have an implementation** before they are officially reviewed by the Core Team.

https://forums.swift.org/t/swift-5-start-your-engines/6456

apple/swift

swift - The Swift Programming Language

apple/swift-evolution

swift-evolution - This maintains proposals for changes and user-visible enhancements to the Swift Programming Language.

Swift 5: start your engines

Hi everyone, The proposal phase for Swift 4 is now officially over, and the release is now in endgame engineering convergence for an expected release later this year. Swift 4 has turned out to be one of the highest quality, well-rounded releases of Swift, and I am grateful to everyone in the community who made this release come together! Now it is time to turn our attention to Swift 5. I have just posted updates to the README.md file on the swift-evolution repository, which outlines the core...