マクロの提案に番号ついた https://github.com/apple/swift-evolution/blob/main/proposals/0382-expression-macros.md

swift-evolution/0382-expression-macros.md at main · apple/swift-evo...

This maintains proposals for changes and user-visible enhancements to the Swift Programming Language. - swift-evolution/0382-expression-macros.md at main · apple/swift-evolution