Xcode 11はSwift Packageの.xcworkspaceを.swiftpmに作るらしい。

$ tree .swiftpm .swiftpm └── xcode ├── package.xcworkspace │   ├── contents.xcworkspacedata │   ├── xcshareddata │   │   └── IDEWorkspaceChecks.plist │   └── xcuserdata │   └── norio.xcuserdatad │   └── UserInterfaceState.xcuserstate └── xcuserdata └── norio.xcuserdatad └── xcschemes └── xcschememanagement.plist 8 directories, 4 files