Add upcomingFeatures for debug configurations

Author: nnsnodnb

SSLCertificateCheckPackage/Package.swift

@@ -92,6 +92,55 @@ extension PackageDescription.Target.PluginUsage {
     }
 }
 
+// MARK: - SwiftSetting extension
+extension PackageDescription.SwiftSetting {
+    /// Forward-scan matching for trailing closures
+    /// - Version: Swift 5.3
+    /// - Since: SwiftPM 5.8
+    /// - SeeAlso: [SE-0286: Forward-scan matching for trailing closures](https://github.com/apple/swift-evolution/blob/main/proposals/0286-forward-scan-trailing-closures.md)
+    static let forwardTrailingClosures: Self = .enableUpcomingFeature("ForwardTrailingClosures")
+    /// Introduce existential `any`
+    /// - Version: Swift 5.6
+    /// - Since: SwiftPM 5.8
+    /// - SeeAlso: [SE-0335: Introduce existential `any`](https://github.com/apple/swift-evolution/blob/main/proposals/0335-existential-any.md)
+    static let existentialAny: Self = .enableUpcomingFeature("ExistentialAny")
+    /// Regex Literals
+    /// - Version: Swift 5.7
+    /// - Since: SwiftPM 5.8
+    /// - SeeAlso: [SE-0354: Regex Literals](https://github.com/apple/swift-evolution/blob/main/proposals/0354-regex-literals.md)
+    static let bareSlashRegexLiterals: Self = .enableUpcomingFeature("BareSlashRegexLiterals")
+    /// Concise magic file names
+    /// - Version: Swift 5.8
+    /// - Since: SwiftPM 5.8
+    /// - SeeAlso: [SE-0274: Concise magic file names](https://github.com/apple/swift-evolution/blob/main/proposals/0274-magic-file.md)
+    static let conciseMagicFile: Self = .enableUpcomingFeature("ConciseMagicFile")
+    /// Importing Forward Declared Objective-C Interfaces and Protocols
+    /// - Version: Swift 5.9
+    /// - Since: SwiftPM 5.9
+    /// - SeeAlso: [SE-0384: Importing Forward Declared Objective-C Interfaces and Protocols](https://github.com/apple/swift-evolution/blob/main/proposals/0384-importing-forward-declared-objc-interfaces-and-protocols.md)
+    static let importObjcForwardDeclarations: Self = .enableUpcomingFeature("ImportObjcForwardDeclarations")
+    /// Remove Actor Iscolation Inference caused by Property Wrappers
+    /// - Version: Swift 5.9
+    /// - Since: SwiftPM 5.9
+    /// - SeeAlso: [SE-0401: Remove Actor Isolation Inference caused by Property Wrappers](https://github.com/apple/swift-evolution/blob/main/proposals/0401-remove-property-wrapper-isolation.md)
+    static let disableOutwardActorInference: Self = .enableUpcomingFeature("DisableOutwardActorInference")
+    /// Deprecate `@UIApplicationMain` and `@NSApplicationMain`
+    /// - Version: Swift 5.10
+    /// - Since: SwiftPM 5.10
+    /// - SeeAlso: [SE-0383: Deprecate `@UIApplicationMain` and `@NSApplicationMain`](https://github.com/apple/swift-evolution/blob/main/proposals/0383-deprecate-uiapplicationmain-and-nsapplicationmain.md)
+    static let deprecateApplicationMain: Self = .enableUpcomingFeature("DeprecateApplicationMain")
+    /// Isolated default value expressions
+    /// - Version: Swift 5.10
+    /// - Since: SwiftPM 5.10
+    /// - SeeAlso: [SE-0411: Isolated default value expressions](https://github.com/apple/swift-evolution/blob/main/proposals/0411-isolated-default-values.md)
+    static let isolatedDefaultValues: Self = .enableUpcomingFeature("IsolatedDefaultValues")
+    /// Strict concurrency for global variables
+    /// - Version: Swift 5.10
+    /// - Since: SwiftPM 5.10
+    /// - SeeAlso: [SE-0412: Strict concurrency for global variables](https://github.com/apple/swift-evolution/blob/main/proposals/0412-strict-concurrency-for-global-variables.md)
+    static let globalConcurrency: Self = .enableUpcomingFeature("GlobalConcurrency")
+}
+
 let package = Package(
     name: .packageName,
     platforms: [
@@ -238,12 +287,23 @@ let debugOtherSwiftFlags = [
     "-strict-concurrency=complete",
     "-enable-actor-data-race-checks",
 ]
+let upcomingFeatures: [PackageDescription.SwiftSetting] = [
+    .forwardTrailingClosures,
+    .existentialAny,
+    .bareSlashRegexLiterals,
+    .conciseMagicFile,
+    .importObjcForwardDeclarations,
+    .disableOutwardActorInference,
+    .deprecateApplicationMain,
+    .isolatedDefaultValues,
+    .globalConcurrency,
+]
 
 for package in package.targets {
     // swiftSettings
     package.swiftSettings = [
         .unsafeFlags(debugOtherSwiftFlags, .when(configuration: .debug)),
-    ]
+    ] + upcomingFeatures
     // plugins
     if let plugins = package.plugins {
         package.plugins = plugins + [.swiftLintPlugin]