remove swift5 code paths

Author: swhitty

FlyingFox/Sources/JSONPredicatePattern.swift

@@ -36,11 +36,7 @@ import Foundation
 @available(*, deprecated, message: "Use JSONBodyPattern")
 public struct JSONPredicatePattern: HTTPBodyPattern {
 
-    #if compiler(>=6)
     nonisolated(unsafe) private var predicate: NSPredicate
-    #else
-    @NonisolatedUnsafe private var predicate: NSPredicate
-    #endif
 
     public init(_ predicate: NSPredicate) {
         self.predicate = predicate

FlyingFox/Sources/NonisolatedUnsafe.swift

@@ -622,11 +622,8 @@ extension URLSessionWebSocketTask.Message {
         }
     }
 }
-#if compiler(>=6)
+
 extension URLSessionWebSocketTask.Message: @retroactive Equatable { }
-#else
-extension URLSessionWebSocketTask.Message: Equatable { }
-#endif
 #endif
 
 extension Task where Success == Never, Failure == Never {

FlyingFox/Tests/HTTPServerTests.swift

@@ -29,8 +29,6 @@
 //  SOFTWARE.
 //
 
-#if compiler(>=6)
-
 #if !canImport(WinSDK)
 
 // Backports the Swift 6 type Mutex<Value> to all Darwin platforms
@@ -215,5 +213,3 @@ package extension Mutex where Value: Sendable & Copyable {
         withLock { $0 }
     }
 }
-
-#endif

FlyingSocks/Sources/Mutex.swift

@@ -128,11 +128,11 @@ public final actor SocketPool<Queue: EventQueue>: AsyncSocketPool {
 
     private func getNotifications() async throws -> [EventNotification] {
         try Task.checkCancellation()
-        let queue = UncheckedSendable(wrappedValue: queue)
-        return try await withIdentifiableThrowingContinuation(isolation: self) { continuation in
+        nonisolated(unsafe) let queue = queue
+        return try await withIdentifiableThrowingContinuation { continuation in
             dispatchQueue.async {
                 let result = Result {
-                    try queue.wrappedValue.getNotifications()
+                    try queue.getNotifications()
                 }
                 continuation.resume(with: result)
             }
@@ -297,11 +297,3 @@ private extension EventNotification {
         errors.isEmpty ? .success(()) : .failure(SocketError.disconnected)
     }
 }
-
-struct UncheckedSendable<Value>: @unchecked Sendable {
-    var wrappedValue: Value
-
-    init(wrappedValue: Value) {
-        self.wrappedValue = wrappedValue
-    }
-}

FlyingSocks/Sources/SocketPool.swift

@@ -241,11 +241,11 @@ private extension Poll {
     }
 
     func getEvents() async throws -> [EventNotification] {
-        let queue = UncheckedSendable(wrappedValue: self)
+        nonisolated(unsafe) let queue = self
         return try await withCheckedThrowingContinuation { continuation in
             DispatchQueue.global().async {
                 let result = Result {
-                    try queue.wrappedValue.getNotifications()
+                    try queue.getNotifications()
                 }
                 continuation.resume(with: result)
             }

FlyingSocks/Tests/SocketPool+PollTests.swift

@@ -233,11 +233,11 @@ private extension kQueue {
     }
 
     func getEvents() async throws -> [EventNotification] {
-        let queue = UncheckedSendable(wrappedValue: self)
+        nonisolated(unsafe) let queue = self
         return try await withCheckedThrowingContinuation { continuation in
             DispatchQueue.global().async {
                 let result = Result {
-                    try queue.wrappedValue.getNotifications()
+                    try queue.getNotifications()
                 }
                 continuation.resume(with: result)
             }