@main
public struct Main {
    public static func main() async {
        var i = 0
        while i < 10 {
            await hello(i)
            i += 1
        }
    }
}
 

@MainActor
func hello(_ i: Int) async {
    print("Hello world", i)
}

// swift-tools-version:5.4
import PackageDescription

let package = Package(
    name: "asyncbug",
    targets: [
        .executableTarget(
            name: "asyncbug",
            swiftSettings: [.unsafeFlags(["-Xfrontend", "-enable-experimental-concurrency"])]),
        .testTarget(
            name: "asyncbugTests",
            dependencies: ["asyncbug"]),
    ]
)

Hello world 0
Hello world 1
Hello world 2
Hello world 3