Switch up compiler directives for concurrency (#111)

* Switch up compiler directives for concurrency

Author: Josh Wright

Sources/Lifecycle/Lifecycle.swift

@@ -12,10 +12,6 @@
 //
 //===----------------------------------------------------------------------===//
 
-#if compiler(>=5.5)
-import _Concurrency
-#endif
-
 #if os(macOS) || os(iOS) || os(watchOS) || os(tvOS)
 import Darwin
 #else
@@ -99,7 +95,7 @@ public struct LifecycleHandler {
     }
 }
 
-#if compiler(>=5.5)
+#if compiler(>=5.5) && canImport(_Concurrency)
 @available(macOS 12.0, *)
 extension LifecycleHandler {
     public init(_ handler: @escaping () async throws -> Void) {
@@ -163,7 +159,7 @@ public struct LifecycleStartHandler<State> {
     }
 }
 
-#if compiler(>=5.5)
+#if compiler(>=5.5) && canImport(_Concurrency)
 @available(macOS 12.0, *)
 extension LifecycleStartHandler {
     public init(_ handler: @escaping () async throws -> State) {
@@ -225,7 +221,7 @@ public struct LifecycleShutdownHandler<State> {
     }
 }
 
-#if compiler(>=5.5)
+#if compiler(>=5.5) && canImport(_Concurrency)
 @available(macOS 12.0, *)
 extension LifecycleShutdownHandler {
     public init(_ handler: @escaping (State) async throws -> Void) {

Tests/LifecycleTests/ComponentLifecycleTests.swift

@@ -1403,6 +1403,8 @@ final class ComponentLifecycleTests: XCTestCase {
         return
         #elseif compiler(<5.5)
         throw XCTSkip()
+        #elseif !canImport(_Concurrency)
+        throw XCTSkip()
         #else
         guard #available(macOS 12.0, *) else {
             throw XCTSkip()
@@ -1437,6 +1439,8 @@ final class ComponentLifecycleTests: XCTestCase {
         return
         #elseif compiler(<5.5)
         throw XCTSkip()
+        #elseif !canImport(_Concurrency)
+        throw XCTSkip()
         #else
         guard #available(macOS 12.0, *) else {
             throw XCTSkip()
@@ -1475,6 +1479,8 @@ final class ComponentLifecycleTests: XCTestCase {
         return
         #elseif compiler(<5.5)
         throw XCTSkip()
+        #elseif !canImport(_Concurrency)
+        throw XCTSkip()
         #else
         guard #available(macOS 12.0, *) else {
             throw XCTSkip()
@@ -1511,6 +1517,8 @@ final class ComponentLifecycleTests: XCTestCase {
         return
         #elseif compiler(<5.5)
         throw XCTSkip()
+        #elseif !canImport(_Concurrency)
+        throw XCTSkip()
         #else
         guard #available(macOS 12.0, *) else {
             throw XCTSkip()
@@ -1547,6 +1555,8 @@ final class ComponentLifecycleTests: XCTestCase {
         return
         #elseif compiler(<5.5)
         throw XCTSkip()
+        #elseif !canImport(_Concurrency)
+        throw XCTSkip()
         #else
         guard #available(macOS 12.0, *) else {
             throw XCTSkip()