project depends on swift-nio build failed

[yh0xa55a8]

Actual behavior

swift-nio build failed.

Steps to reproduce

1. Create a swift project from xcode using swift package manager.
2. Add swiftNIO to dependency.
3. Build the project, got a compiler error:

<HOME>/Library/Developer/Xcode/DerivedData/test-beeqcutotskvvwafknwhdzcnlayo/SourcePackages/checkouts/swift-nio/Sources/NIOCore/AsyncAwaitSupport+OldXcodes.swift:66:91: error: cannot find type 'Task' in scope
    public func completeWithTask(_ body: @escaping @Sendable () async throws -> Value) -> Task<Void, Never> {
                                                                                          ^~~~
<HOME>/Library/Developer/Xcode/DerivedData/test-beeqcutotskvvwafknwhdzcnlayo/SourcePackages/checkouts/swift-nio/Sources/NIOCore/AsyncAwaitSupport+OldXcodes.swift:25:26: error: cannot find 'withUnsafeThrowingContinuation' in scope
        return try await withUnsafeThrowingContinuation { cont in
                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
<HOME>/Library/Developer/Xcode/DerivedData/test-beeqcutotskvvwafknwhdzcnlayo/SourcePackages/checkouts/swift-nio/Sources/NIOCore/AsyncAwaitSupport+OldXcodes.swift:43:26: error: cannot find 'withCheckedThrowingContinuation' in scope
        return try await withCheckedThrowingContinuation { cont in
                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~



Build failed    2021/12/22, 8:20 PM    0.6 seconds

A minimum Package.swift File is as follows:

// swift-tools-version:5.5
// The swift-tools-version declares the minimum version of Swift required to build this package.

import PackageDescription

let package = Package(
    name: "test",
    
    dependencies: [
        .package(url: "https://github.com/apple/swift-nio.git", from: "2.33.0")
    ],
    targets: [
        .target(
            name: "App",
            dependencies: [
                .product(name: "NIO", package: "swift-nio"),
            ]
        ),
        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
        // Targets can depend on other targets in this package, and on products in packages this package depends on.
        .executableTarget(name: "Run", dependencies: [.target(name: "App")])
    ]
)

I use

SwiftNIO version/commit hash

2.36.0

System & version information

Xcode 13.0 (13A233)
swift compiler version: swift-driver version: 1.26.9 Apple Swift version 5.5 (swiftlang-1300.0.31.1 clang-1300.0.29.1)
Target: x86_64-apple-macosx12.0

[yh0xa55a8]

It seems related to some code about new concurrency feature in swift 5.5, could it may caused by a compiler version issue or environment problem?

[yh0xa55a8]

I tried to chage the version of swift-nio and found that Only v2.36.0 has this issue.
I guess it may related to #2004.

[0xTim]

This will be fixed by #2015. The workaround for now is to update to Xcode 13.1/13.2

[Lukasa]

Fixed by #2015.