Update the Swift version to 6.0

Author: shahmishal

Package.swift

@@ -23,7 +23,7 @@ let availabilityDefinition = PackageDescription.SwiftSetting.unsafeFlags([
     "-Xfrontend",
     "-define-availability",
     "-Xfrontend",
-    "SwiftStdlib 5.11:macOS 9999, iOS 9999, watchOS 9999, tvOS 9999",
+    "SwiftStdlib 6.0:macOS 9999, iOS 9999, watchOS 9999, tvOS 9999",
 ])
 
 /// Swift settings for building a private stdlib-like module that is to be used

Sources/_StringProcessing/LiteralPrinter.swift

@@ -33,7 +33,7 @@ extension Regex {
   /// the `CustomConsumingRegexComponent` protocol, this property is `nil`.
   ///
   /// The value of this property may change between different releases of Swift.
-  @available(SwiftStdlib 5.11, *)
+  @available(SwiftStdlib 6.0, *)
   public var _literalPattern: String? {
     var gen = LiteralPrinter(options: MatchingOptions())
     gen.outputNode(self.program.tree.root)

Tests/RegexTests/LiteralPrinterTests.swift

@@ -14,7 +14,7 @@ import XCTest
 import _StringProcessing
 import RegexBuilder
 
-@available(SwiftStdlib 5.11, *)
+@available(SwiftStdlib 6.0, *)
 fileprivate func _literalTest<T>(
   _ regex: Regex<T>,
   expected: String?,
@@ -28,7 +28,7 @@ fileprivate func _literalTest<T>(
   }
 }
 
-@available(SwiftStdlib 5.11, *)
+@available(SwiftStdlib 6.0, *)
 extension RegexTests {
   func testPrintableRegex() throws {
     let regexString = #"([a-fGH1-9[^\D]]+)?b*cd(e.+)\2\w\S+?"#
@@ -73,7 +73,7 @@ extension RegexTests {
 // MARK: - PrintableRegex
 
 // Demonstration of a guaranteed Codable/Sendable regex type.
-@available(SwiftStdlib 5.11, *)
+@available(SwiftStdlib 6.0, *)
 struct PrintableRegex: RegexComponent, @unchecked Sendable {
   var pattern: String
   var regex: Regex<AnyRegexOutput>
@@ -94,7 +94,7 @@ struct PrintableRegex: RegexComponent, @unchecked Sendable {
   }
 }
 
-@available(SwiftStdlib 5.11, *)
+@available(SwiftStdlib 6.0, *)
 extension PrintableRegex: Codable {
   init(from decoder: Decoder) throws {
     let container = try decoder.singleValueContainer()
@@ -108,7 +108,7 @@ extension PrintableRegex: Codable {
   }
 }
 
-@available(SwiftStdlib 5.11, *)
+@available(SwiftStdlib 6.0, *)
 extension PrintableRegex: CustomStringConvertible {
   var description: String {
     pattern

Tests/RegexTests/MatchTests.swift

@@ -23,7 +23,7 @@ struct MatchError: Error {
 
 // This just piggy-backs on the existing match testing to validate that
 // literal patterns round trip correctly.
-@available(SwiftStdlib 5.11, *)
+@available(SwiftStdlib 6.0, *)
 func _roundTripLiteral(
   _ regexStr: String,
   syntax: SyntaxOptions
@@ -88,7 +88,7 @@ func _firstMatch(
     }
   }
 
-  if #available(SwiftStdlib 5.11, *) {
+  if #available(SwiftStdlib 6.0, *) {
     let roundTripRegex = try? _roundTripLiteral(regexStr, syntax: syntax)
     let roundTripResult = try? roundTripRegex?
       .matchingSemantics(semanticLevel)

Tests/RegexTests/ParseTests.swift

@@ -119,7 +119,7 @@ func parseTest(
   }
   serializedCaptures.deallocate()
 
-  if #available(SwiftStdlib 5.11, *),
+  if #available(SwiftStdlib 6.0, *),
      !unsupported && expectedErrors.isEmpty,
      let pattern = Regex<AnyRegexOutput>(ast: ast)._literalPattern
   {