[DO NOT MERGE] Debug PR

.github/workflows/pull_request.yml

@@ -42,3 +42,24 @@ jobs:
     uses: apple/swift-nio/.github/workflows/cxx_interop.yml@main
     with:
       linux_5_9_enabled: false
+
+  split-build-test:
+    name: Build and test separately
+    runs-on: ubuntu-latest
+    container:
+      image: "swiftlang/swift:nightly-main-jammy"
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          persist-credentials: false
+          submodules: true
+      - name: Mark the workspace as safe
+        # https://github.com/actions/checkout/issues/766
+        run: git config --global --add safe.directory ${GITHUB_WORKSPACE}
+      - name: Build
+        run: |
+          swift build --explicit-target-dependency-import-check error -Xswiftc -require-explicit-sendable
+      - name: Test
+        run: |
+          swift test --explicit-target-dependency-import-check error -Xswiftc -require-explicit-sendable

Tests/DistributedActorsTestKitTests/ActorTestKitTests.swift

@@ -12,11 +12,42 @@
 //
 //===----------------------------------------------------------------------===//
 
+#if os(Linux)
+@preconcurrency import Glibc
+#endif
 import XCTest
 
 @testable import DistributedActorsTestKit
 @testable import DistributedCluster
 
+final class _ForceFlush1StartTest: XCTestCase {
+    override class func setUp() {
+        super.setUp()
+
+        fflush(stdout)
+        fflush(stderr)
+        for channel in [0, 1] as [Int32] {
+           write(channel, Array(repeating: UInt8(ascii: "_"), count: 32*1024) + [UInt8(ascii: "\n"), 0], 32*1024 + 2)
+        }
+    }
+
+    func test() {}
+}
+
+final class Z_ForceFlush1EndTest: XCTestCase {
+    override class func setUp() {
+        super.setUp()
+
+        fflush(stdout)
+        fflush(stderr)
+        for channel in [0, 1] as [Int32] {
+           write(channel, Array(repeating: UInt8(ascii: "_"), count: 32*1024) + [UInt8(ascii: "\n"), 0], 32*1024 + 2)
+        }
+    }
+
+    func test() {}
+}
+
 final class ActorTestKitTests: XCTestCase {
     var system: ClusterSystem!
     var testKit: ActorTestKit!

Tests/DistributedClusterTests/ActorRefAdapterTests.swift

@@ -12,12 +12,44 @@
 //
 //===----------------------------------------------------------------------===//
 
+#if os(Linux)
+@preconcurrency import Glibc
+#endif
+
 import DistributedActorsTestKit
 import Foundation
 import XCTest
 
 @testable import DistributedCluster
 
+final class __ForceFlush2StartTest: XCTestCase {
+    override class func setUp() {
+        super.setUp()
+
+        fflush(stdout)
+        fflush(stderr)
+        for channel in [0, 1] as [Int32] {
+           write(channel, Array(repeating: UInt8(ascii: "_"), count: 32*1024) + [UInt8(ascii: "\n"), 0], 32*1024 + 2)
+        }
+    }
+
+    func test() {}
+}
+
+final class Z_ForceFlush2EndTest: XCTestCase {
+    override class func setUp() {
+        super.setUp()
+
+        fflush(stdout)
+        fflush(stderr)
+        for channel in [0, 1] as [Int32] {
+           write(channel, Array(repeating: UInt8(ascii: "_"), count: 32*1024) + [UInt8(ascii: "\n"), 0], 32*1024 + 2)
+        }
+    }
+
+    func test() {}
+}
+
 class _ActorRefAdapterTests: SingleClusterSystemXCTestCase {
     func test_adaptedRef_shouldConvertMessages() throws {
         let probe = self.testKit.makeTestProbe(expecting: String.self)