読んでないからまだわからん https://github.com/apple/swift-evolution/blob/main/proposals/0294-package-executable-targets.md

swift-evolution/0294-package-executable-targets.md at main · apple/...

This maintains proposals for changes and user-visible enhancements to the Swift Programming Language. - swift-evolution/0294-package-executable-targets.md at main · apple/swift-evolution