Concurrency safety fixes

Author: toastersocks

Package.resolved

@@ -14,7 +14,7 @@ let package = Package(
     ],
     dependencies: [
         // Dependencies declare other packages that this package depends on.
-        .package(url: "https://github.com/toastersocks/SwiftCheck", .upToNextMajor(from: "0.13.0")),
+        .package(url: "https://github.com/toastersocks/SwiftCheck", .upToNextMajor(from: "0.13.1")),
     ],
     targets: [
         // Targets are the basic building blocks of a package. A target can define a module or a test suite.

Package.swift

@@ -2,7 +2,7 @@ import SwiftUI
 
 
 /// A Flow layout arranges its subviews in a line, wrapping at the edge and starting new lines as needed, similar to how words wrap in a paragraph.
-public struct Flow: Layout {
+public struct Flow: Layout, Sendable {
     /// The alignment of the subviews within the container.
     let alignment: Alignment
     /// The space between subviews.
@@ -210,7 +210,7 @@ public struct Flow: Layout {
     }
 
     /// The alignment of subviews within the flow.
-    public enum Alignment: CaseIterable {
+    public enum Alignment: CaseIterable, Sendable {
         /// Aligns the tops of subviews within a row. Rows are flush with the leading edge of the container.
         case topLeading
         /// Aligns the tops of subviews within a row. Rows are flush with the trailing edge of the container.

Sources/Flow/Flow.swift

@@ -26,14 +26,8 @@ extension CGFloat: @retroactive Arbitrary {
         }
     }
 }
-
-extension Flow.Alignment: @retroactive Arbitrary {
-    public static var arbitrary: Gen<Flow.Alignment> {
-        Gen<Flow.Alignment>.fromElements(of: [.topLeading, .topTrailing, .bottomLeading, .bottomTrailing, .center, .centerJustify, .centerDistribute])
-    }
-}
 #else
-extension CGSize: @retroactive Arbitrary {
+extension CGSize: Arbitrary {
     public static var arbitrary: Gen<CGSize> {
         Gen<CGSize>.compose { composer in
             CGSize(width: composer.generate(using: Double.arbitrary.suchThat { $0 >= 0 && $0 <= 410 }),
@@ -42,20 +36,20 @@ extension CGSize: @retroactive Arbitrary {
     }
 }
 
-extension CGFloat: @retroactive Arbitrary {
+extension CGFloat: Arbitrary {
     public static var arbitrary: Gen<CGFloat> {
         Gen<CGFloat>.compose { composer in
             CGFloat(Double.arbitrary.generate)
         }
     }
+}
+#endif
 
-
-extension Flow.Alignment: @retroactive Arbitrary {
+extension Flow.Alignment: Arbitrary {
     public static var arbitrary: Gen<Flow.Alignment> {
         Gen<Flow.Alignment>.fromElements(of: [.topLeading, .topTrailing, .bottomLeading, .bottomTrailing, .center, .centerJustify, .centerDistribute])
     }
 }
-#endif
 
 extension MockLayoutSubview: Arbitrary {
     public static var arbitrary: Gen<MockLayoutSubview> {