Update to Swift 6.2

Author: Prachi Gauriar

.github/workflows/VerifyChanges.yaml

@@ -14,9 +14,9 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v4
-      - name: Select Xcode 16.4
+      - name: Select Xcode 26.0.0
         run: |
-          sudo xcode-select -s /Applications/Xcode_16.4.0.app
+          sudo xcode-select -s /Applications/Xcode_26.0.0.app
       - name: Lint
         run: |
           Scripts/lint
@@ -70,9 +70,9 @@ jobs:
           sourcepackages-directory: .build/DerivedData/SourcePackages
           swiftpm-package-resolved-file: Package.resolved
           verbose: true
-      - name: Select Xcode 16.4
+      - name: Select Xcode 26.0.0
         run: |
-          sudo xcode-select -s /Applications/Xcode_16.4.0.app
+          sudo xcode-select -s /Applications/Xcode_26.0.0.app
       - name: Build for Testing
         run: |
           "$DEV_BUILDS"/build_and_test.sh --action build-for-testing
@@ -118,9 +118,9 @@ jobs:
       - name: Download xccovPretty output
         uses: actions/download-artifact@v4
         with:
-          name: xccovPrettyOutput-iOS
+          name: xccovPrettyOutput-macOS
       - name: Post Code Coverage Comment
         uses: thollander/actions-comment-pull-request@v3
         with:
-          file-path: xccovPretty-iOS.output
-          comment-tag: codeCoverage-iOS
+          file-path: xccovPretty-macOS.output
+          comment-tag: codeCoverage-macOS

.swift-format

@@ -14,6 +14,7 @@
     "lineBreakBetweenDeclarationAttributes": false,
     "lineLength": 120,
     "maximumBlankLines": 2,
+    "multilineTrailingCommaBehavior": "alwaysUsed",
     "multiElementCollectionTrailingCommas": true,
     "noAssignmentInExpressions": {
         "allowedFunctions": []

CLAUDE.md

@@ -67,7 +67,7 @@ reproducibility.
 
   - **Swift Numerics**: Used for `RealModule` in tests
   - **Platform Requirements**: iOS 18+, macOS 15+, tvOS 18+, visionOS 2+, watchOS 11+
-  - **Swift Version**: Requires Swift 6.1 toolchain
+  - **Swift Version**: Requires Swift 6.2 toolchain
 
 ### Testing Strategy
 
@@ -85,4 +85,4 @@ reproducibility.
       - 100 character line length
       - 4-space indented code blocks (no fenced blocks)
       - 2-space indented bullet lists with alignment
-      - Consistent terminology (function vs method, type vs class)
+      - Consistent terminology (function vs method, type vs class)

Package.swift

@@ -1,4 +1,4 @@
-// swift-tools-version: 6.1
+// swift-tools-version: 6.2
 
 import PackageDescription
 

README.md

@@ -28,7 +28,7 @@ View our [changelog](CHANGELOG.md) to see what’s new.
 
 ## Development Requirements
 
-DevTesting requires a Swift 6.1 toolchain to build. We only test on Apple platforms. We follow the
+DevTesting requires a Swift 6.2+ toolchain to build. We only test on Apple platforms. We follow the
 [Swift API Design Guidelines][SwiftAPIDesignGuidelines]. We take pride in the fact that our public
 interfaces are fully documented and tested. We aim for overall test coverage over 99%.
 

Tests/DevTestingTests/Random Value Generation/String+RandomTests.swift

@@ -11,6 +11,17 @@ import Testing
 @testable import DevTesting
 
 struct String_RandomTests {
+    #if os(macOS)
+    @Test
+    func randomWithCharactersHaltsWhenCharactersIsEmptyAndCountIsNonZero() async {
+        await #expect(processExitsWith: .failure) {
+            var rng = SystemRandomNumberGenerator()
+            _ = String.random(withCharactersFrom: "", count: 1, using: &rng)
+        }
+    }
+    #endif
+
+
     @Test
     func randomWithCharactersReturnsEmptyWhenCharactersIsEmptyOrCountIs0() {
         var rng = SystemRandomNumberGenerator()