I copied and pasted the example code snippet of https://developer.apple.com/documentation/System/FilePath into XCode Playground let message: String = "This is a log message." let path: FilePath = "/tmp/log" let fd = try FileDescriptor.open(path, .writeOnly, options: .append) try fd.closeAfter { try fd.writeAll(message.utf8) } The run complains that expression failed to parse: error: MyPlayground.playground:2:11: error: cannot find type 'FilePath' in scope let path: FilePath = "/tmp/log"      ^~~~~~~~ error: MyPlayground.playground:3:14: error: cannot find 'FileDescriptor' in scope let fd = try FileDescriptor.open(path, .writeOnly, options: .append)        ^~~~~~~~~~~~~~ I use macOS 13.0.1 (22A400) and XCode 14.1 (14B47b). The above document link tells macOS 11.0+. It seems I am using a sufficiently new environment that should have FilePath, right?