Drop support for older Apple releases. (#1533)

This PR drops support for older Apple releases when Swift Testing is
built as a package.

See Also: swiftlang/swift#87042

### Checklist:

- [x] Code and documentation should follow the style of the [Style
Guide](https://github.com/apple/swift-testing/blob/main/Documentation/StyleGuide.md).
- [x] If public symbols are renamed or modified, DocC references should
be updated.

Author: grynspan

Package.swift

@@ -42,11 +42,11 @@ let package = Package(
   platforms: {
     if !buildingForEmbedded {
       [
-        .macOS(.v10_15),
-        .iOS(.v13),
-        .watchOS(.v6),
-        .tvOS(.v13),
-        .macCatalyst(.v13),
+        .macOS(.v14),
+        .iOS(.v17),
+        .watchOS(.v10),
+        .tvOS(.v17),
+        .macCatalyst(.v17),
         .visionOS(.v1),
       ]
     } else {
@@ -423,12 +423,8 @@ extension Array where Element == PackageDescription.SwiftSetting {
   /// [swift#65218](https://github.com/swiftlang/swift/pull/65218).
   private static var availabilityMacroSettings: Self {
     [
-      .enableExperimentalFeature("AvailabilityMacro=_mangledTypeNameAPI:macOS 11.0, iOS 14.0, watchOS 7.0, tvOS 14.0"),
       .enableExperimentalFeature("AvailabilityMacro=_uttypesAPI:macOS 11.0, iOS 14.0, watchOS 7.0, tvOS 14.0"),
-      .enableExperimentalFeature("AvailabilityMacro=_backtraceAsyncAPI:macOS 12.0, iOS 15.0, watchOS 8.0, tvOS 15.0"),
       .enableExperimentalFeature("AvailabilityMacro=_clockAPI:macOS 13.0, iOS 16.0, watchOS 9.0, tvOS 16.0"),
-      .enableExperimentalFeature("AvailabilityMacro=_regexAPI:macOS 13.0, iOS 16.0, tvOS 16.0, watchOS 9.0"),
-      .enableExperimentalFeature("AvailabilityMacro=_swiftVersionAPI:macOS 13.0, iOS 16.0, tvOS 16.0, watchOS 9.0"),
       .enableExperimentalFeature("AvailabilityMacro=_typedThrowsAPI:macOS 15.0, iOS 18.0, watchOS 11.0, tvOS 18.0, visionOS 2.0"),
       .enableExperimentalFeature("AvailabilityMacro=_castingWithNonCopyableGenerics:macOS 15.0, iOS 18.0, watchOS 11.0, tvOS 18.0, visionOS 2.0"),
 

Sources/Overlays/_Testing_AppKit/Attachments/NSImage+AttachableAsImage.swift

@@ -36,7 +36,7 @@ extension NSImageRep {
 /// @Metadata {
 ///   @Available(Swift, introduced: 6.3)
 /// }
-@available(_uttypesAPI, *)
+@available(_uttypesAPI, *) // For DocC
 extension NSImage: AttachableAsImage, AttachableAsCGImage {
   /// @Metadata {
   ///   @Available(Swift, introduced: 6.3)

Sources/Overlays/_Testing_CoreGraphics/Attachments/AttachableAsCGImage.swift

@@ -22,7 +22,6 @@ private import UniformTypeIdentifiers
 ///
 /// This protocol is not part of the public interface of the testing library. It
 /// encapsulates Apple-specific logic for image attachments.
-@available(_uttypesAPI, *)
 package protocol AttachableAsCGImage: AttachableAsImage {
   /// An instance of `CGImage` representing this image.
   ///
@@ -51,11 +50,9 @@ package protocol AttachableAsCGImage: AttachableAsImage {
 }
 
 /// All type identifiers supported by Image I/O.
-@available(_uttypesAPI, *)
 private let _supportedTypeIdentifiers = Set(CGImageDestinationCopyTypeIdentifiers() as? [String] ?? [])
 
 /// All content types supported by Image I/O.
-@available(_uttypesAPI, *)
 private let _supportedContentTypes = {
 #if canImport(UniformTypeIdentifiers_Private)
   UTType._types(identifiers: _supportedTypeIdentifiers).values
@@ -64,7 +61,6 @@ private let _supportedContentTypes = {
 #endif
 }()
 
-@available(_uttypesAPI, *)
 extension AttachableAsCGImage {
   package var attachmentOrientation: CGImagePropertyOrientation {
     .up

Sources/Overlays/_Testing_CoreGraphics/Attachments/AttachableImageFormat+UTType.swift

@@ -14,7 +14,7 @@ public import UniformTypeIdentifiers
 /// @Metadata {
 ///   @Available(Swift, introduced: 6.3)
 /// }
-@available(_uttypesAPI, *)
+@available(_uttypesAPI, *) // For DocC
 extension AttachableImageFormat {
   /// The content type corresponding to this image format.
   ///
@@ -101,7 +101,6 @@ extension AttachableImageFormat {
 
 // MARK: - CustomStringConvertible, CustomDebugStringConvertible
 
-@available(_uttypesAPI, *)
 extension AttachableImageFormat.Kind: CustomStringConvertible, CustomDebugStringConvertible {
   /// The content type corresponding to this image format.
   fileprivate var contentType: UTType {

Sources/Overlays/_Testing_CoreGraphics/Attachments/CGImage+AttachableAsImage.swift

@@ -14,7 +14,7 @@ public import CoreGraphics
 /// @Metadata {
 ///   @Available(Swift, introduced: 6.3)
 /// }
-@available(_uttypesAPI, *)
+@available(_uttypesAPI, *) // For DocC
 extension CGImage: AttachableAsImage, AttachableAsCGImage {
   /// @Metadata {
   ///   @Available(Swift, introduced: 6.3)

Sources/Overlays/_Testing_CoreGraphics/Attachments/_AttachableImageWrapper+AttachableWrapper.swift

@@ -16,7 +16,6 @@ private import UniformTypeIdentifiers
 /// @Metadata {
 ///   @Available(Swift, introduced: 6.3)
 /// }
-@available(_uttypesAPI, *)
 extension _AttachableImageWrapper: Attachable, AttachableWrapper where Image: AttachableAsImage {
   /// Get the image format to use when encoding an image, substituting a
   /// concrete type for `UTType.image` in particular.

Sources/Overlays/_Testing_CoreImage/Attachments/CIImage+AttachableAsImage.swift

@@ -15,7 +15,7 @@ public import _Testing_CoreGraphics
 /// @Metadata {
 ///   @Available(Swift, introduced: 6.3)
 /// }
-@available(_uttypesAPI, *)
+@available(_uttypesAPI, *) // For DocC
 extension CIImage: AttachableAsImage, AttachableAsCGImage {
   /// @Metadata {
   ///   @Available(Swift, introduced: 6.3)

Sources/Overlays/_Testing_UIKit/Attachments/UIImage+AttachableAsImage.swift

@@ -20,7 +20,7 @@ private import UIKitCore_Private
 /// @Metadata {
 ///   @Available(Swift, introduced: 6.3)
 /// }
-@available(_uttypesAPI, *)
+@available(_uttypesAPI, *) // For DocC
 extension UIImage: AttachableAsImage, AttachableAsCGImage {
   /// @Metadata {
   ///   @Available(Swift, introduced: 6.3)

Sources/Overlays/_Testing_WinSDK/Attachments/AttachableAsIWICBitmapSource.swift

@@ -104,7 +104,7 @@ extension AttachableAsIWICBitmapSource {
   /// used by types that conform to ``AttachableAsIWICBitmapSource``.
   ///
   /// For documentation, see ``AttachableAsImage/withUnsafeBytes(as:_:)``.
-  public func withUnsafeBytesImpl<R>(as imageFormat: AttachableImageFormat, _ body: (UnsafeRawBufferPointer) throws -> R) throws -> R {
+  func withUnsafeBytesImpl<R>(as imageFormat: AttachableImageFormat, _ body: (UnsafeRawBufferPointer) throws -> R) throws -> R {
     // Create an in-memory stream to write the image data to. Note that Windows
     // documentation recommends SHCreateMemStream() instead, but that function
     // does not provide a mechanism to access the underlying memory directly.

Sources/Testing/ABI/EntryPoints/EntryPoint.swift

@@ -629,9 +629,6 @@ public func configurationForEntryPoint(from args: __CommandLineArguments_v0) thr
       return .unfiltered
     }
 
-    guard #available(_regexAPI, *) else {
-      throw _EntryPointError.featureUnavailable("The `\(label)' option is not supported on this OS version.")
-    }
     return try Configuration.TestFilter(membership: membership, matchingAnyOf: regexes)
   }
   filters.append(try testFilter(forRegularExpressions: args.filter, label: "--filter", membership: .including))