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Track the adoption of Swift 6 strict concurrency checks for data race safety. How many packages are Ready for Swift 6?

Build Information

Failed to build DifferenceKit with Swift 6.1 for visionOS using Xcode 16.3.

Build Command

Build command unavailable

Build Log

========================================
RunAll
========================================
Builder version: 4.61.0
Interrupt handler set up.
========================================
Checkout
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Clone URL: https://github.com/ra1028/DifferenceKit.git
Reference: 1.3.0
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/ra1028/DifferenceKit
 * tag               1.3.0      -> FETCH_HEAD
HEAD is now at 073b967 Merge pull request #146 from ra1028/v1.3.0
Cloned https://github.com/ra1028/DifferenceKit.git
Revision (git rev-parse @):
073b9671ce2b9b5b96398611427a1f929927e428
SUCCESS checkout https://github.com/ra1028/DifferenceKit.git at 1.3.0
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Build
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Selected platform:         visionOS
Swift version:             6.1
Building package at path:  $PWD
https://github.com/ra1028/DifferenceKit.git
https://github.com/ra1028/DifferenceKit.git
{
  "dependencies" : [
  ],
  "manifest_display_name" : "DifferenceKit",
  "name" : "DifferenceKit",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
    {
      "name" : "ios",
      "version" : "9.0"
    },
    {
      "name" : "macos",
      "version" : "10.10"
    },
    {
      "name" : "tvos",
      "version" : "9.0"
    },
    {
      "name" : "watchos",
      "version" : "2.0"
    }
  ],
  "products" : [
    {
      "name" : "DifferenceKit",
      "targets" : [
        "DifferenceKit"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "swift_languages_versions" : [
    "4.2",
    "5"
  ],
  "targets" : [
    {
      "c99name" : "DifferenceKitTests",
      "module_type" : "SwiftTarget",
      "name" : "DifferenceKitTests",
      "path" : "Tests",
      "sources" : [
        "AlgorithmTest.swift",
        "AnyDifferentiableTest.swift",
        "ArraySectionTest.swift",
        "ChangesetTest.swift",
        "ContentEquatableTest.swift",
        "ElementPathTest.swift",
        "MeasurementTest.swift",
        "StagedChangesetTest.swift",
        "TestTools.swift",
        "XCTestManifests.swift"
      ],
      "target_dependencies" : [
        "DifferenceKit"
      ],
      "type" : "test"
    },
    {
      "c99name" : "DifferenceKit",
      "module_type" : "SwiftTarget",
      "name" : "DifferenceKit",
      "path" : "Sources",
      "product_memberships" : [
        "DifferenceKit"
      ],
      "sources" : [
        "Algorithm.swift",
        "AnyDifferentiable.swift",
        "ArraySection.swift",
        "Changeset.swift",
        "ContentEquatable.swift",
        "ContentIdentifiable.swift",
        "Differentiable.swift",
        "DifferentiableSection.swift",
        "ElementPath.swift",
        "Extensions/AppKitExtension.swift",
        "Extensions/UIKitExtension.swift",
        "StagedChangeset.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.0"
}
Command line invocation:
    /Applications/Xcode-16.3.0.app/Contents/Developer/usr/bin/xcodebuild -IDEClonedSourcePackagesDirPathOverride=/Users/admin/builder/spi-builder-workspace/.dependencies -resolvePackageDependencies
resolved source packages:
{
  "dependencies" : [
  ],
  "manifest_display_name" : "DifferenceKit",
  "name" : "DifferenceKit",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
    {
      "name" : "ios",
      "version" : "9.0"
    },
    {
      "name" : "macos",
      "version" : "10.10"
    },
    {
      "name" : "tvos",
      "version" : "9.0"
    },
    {
      "name" : "watchos",
      "version" : "2.0"
    }
  ],
  "products" : [
    {
      "name" : "DifferenceKit",
      "targets" : [
        "DifferenceKit"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "swift_languages_versions" : [
    "4.2",
    "5"
  ],
  "targets" : [
    {
      "c99name" : "DifferenceKitTests",
      "module_type" : "SwiftTarget",
      "name" : "DifferenceKitTests",
      "path" : "Tests",
      "sources" : [
        "AlgorithmTest.swift",
        "AnyDifferentiableTest.swift",
        "ArraySectionTest.swift",
        "ChangesetTest.swift",
        "ContentEquatableTest.swift",
        "ElementPathTest.swift",
        "MeasurementTest.swift",
        "StagedChangesetTest.swift",
        "TestTools.swift",
        "XCTestManifests.swift"
      ],
      "target_dependencies" : [
        "DifferenceKit"
      ],
      "type" : "test"
    },
    {
      "c99name" : "DifferenceKit",
      "module_type" : "SwiftTarget",
      "name" : "DifferenceKit",
      "path" : "Sources",
      "product_memberships" : [
        "DifferenceKit"
      ],
      "sources" : [
        "Algorithm.swift",
        "AnyDifferentiable.swift",
        "ArraySection.swift",
        "Changeset.swift",
        "ContentEquatable.swift",
        "ContentIdentifiable.swift",
        "Differentiable.swift",
        "DifferentiableSection.swift",
        "ElementPath.swift",
        "Extensions/AppKitExtension.swift",
        "Extensions/UIKitExtension.swift",
        "StagedChangeset.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.0"
}
{
  "project" : {
    "configurations" : [
      "Debug",
      "Release"
    ],
    "name" : "DifferenceKit",
    "schemes" : [
      "DifferenceKit"
    ],
    "targets" : [
      "DifferenceKit",
      "Tests"
    ]
  }
}
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-16.3.0.app xcrun xcodebuild -IDEClonedSourcePackagesDirPathOverride=$PWD/.dependencies -skipMacroValidation -skipPackagePluginValidation -derivedDataPath $PWD/.derivedData build -scheme DifferenceKit -destination generic/platform=xrOS OTHER_SWIFT_FLAGS=-stats-output-dir .stats -strict-concurrency=complete -enable-upcoming-feature StrictConcurrency -enable-upcoming-feature DisableOutwardActorInference -enable-upcoming-feature GlobalActorIsolatedTypesUsability -enable-upcoming-feature InferSendableFromCaptures
Command line invocation:
    /Applications/Xcode-16.3.0.app/Contents/Developer/usr/bin/xcodebuild -IDEClonedSourcePackagesDirPathOverride=/Users/admin/builder/spi-builder-workspace/.dependencies -skipMacroValidation -skipPackagePluginValidation -derivedDataPath /Users/admin/builder/spi-builder-workspace/.derivedData build -scheme DifferenceKit -destination generic/platform=xrOS "OTHER_SWIFT_FLAGS=-stats-output-dir .stats -strict-concurrency=complete -enable-upcoming-feature StrictConcurrency -enable-upcoming-feature DisableOutwardActorInference -enable-upcoming-feature GlobalActorIsolatedTypesUsability -enable-upcoming-feature InferSendableFromCaptures"
Build settings from command line:
    OTHER_SWIFT_FLAGS = -stats-output-dir .stats -strict-concurrency=complete -enable-upcoming-feature StrictConcurrency -enable-upcoming-feature DisableOutwardActorInference -enable-upcoming-feature GlobalActorIsolatedTypesUsability -enable-upcoming-feature InferSendableFromCaptures
2025-04-26 18:02:19.393 xcodebuild[575:3270] Writing error result bundle to /var/folders/5k/5yc19ymj0jqd5v0zvgfqz0xw0000gn/T/ResultBundle_2025-26-04_18-02-0019.xcresult
xcodebuild: error: Unable to find a destination matching the provided destination specifier:
		{ generic:1, platform:xrOS }
	Available destinations for the "DifferenceKit" scheme:
		{ platform:macOS, arch:arm64, id:070548e08627e21adac23639a7967925bdd4d784, name:My Mac }
		{ platform:macOS, arch:x86_64, id:070548e08627e21adac23639a7967925bdd4d784, name:My Mac }
		{ platform:iOS, id:dvtdevice-DVTiPhonePlaceholder-iphoneos:placeholder, name:Any iOS Device }
		{ platform:iOS Simulator, id:dvtdevice-DVTiOSDeviceSimulatorPlaceholder-iphonesimulator:placeholder, name:Any iOS Simulator Device }
		{ platform:macOS, name:Any Mac }
		{ platform:tvOS, id:dvtdevice-DVTiOSDevicePlaceholder-appletvos:placeholder, name:Any tvOS Device }
		{ platform:tvOS Simulator, id:dvtdevice-DVTiOSDeviceSimulatorPlaceholder-appletvsimulator:placeholder, name:Any tvOS Simulator Device }
		{ platform:watchOS, id:dvtdevice-DVTiOSDevicePlaceholder-watchos:placeholder, name:Any watchOS Device }
		{ platform:watchOS Simulator, id:dvtdevice-DVTiOSDeviceSimulatorPlaceholder-watchsimulator:placeholder, name:Any watchOS Simulator Device }
INFRASTRUCTURE ERROR (status: destinationUnavailable