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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 JSONFeed with Swift 6.1 for visionOS using Xcode 16.3.

Build Command

Build command unavailable

Build Log

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RunAll
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Builder version: 4.61.0
Interrupt handler set up.
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Checkout
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Clone URL: https://github.com/flight-school/jsonfeed.git
Reference: master
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/flight-school/jsonfeed
 * branch            master     -> FETCH_HEAD
 * [new branch]      master     -> origin/master
HEAD is now at 71b34b9 Use GitHub Actions for CI/CD (#1)
Cloned https://github.com/flight-school/jsonfeed.git
Revision (git rev-parse @):
71b34b945c17c5998e8c1f93ccefd8fd95033a78
SUCCESS checkout https://github.com/flight-school/jsonfeed.git at master
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Build
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Selected platform:         visionOS
Swift version:             6.1
Building package at path:  $PWD
https://github.com/flight-school/jsonfeed.git
https://github.com/flight-school/jsonfeed.git
{
  "dependencies" : [
  ],
  "manifest_display_name" : "JSONFeed",
  "name" : "JSONFeed",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "JSONFeed",
      "targets" : [
        "JSONFeed"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "JSONFeedTests",
      "module_type" : "SwiftTarget",
      "name" : "JSONFeedTests",
      "path" : "Tests/JSONFeedTests",
      "sources" : [
        "JSONFeedTests.swift"
      ],
      "target_dependencies" : [
        "JSONFeed"
      ],
      "type" : "test"
    },
    {
      "c99name" : "JSONFeed",
      "module_type" : "SwiftTarget",
      "name" : "JSONFeed",
      "path" : "Sources/JSONFeed",
      "product_memberships" : [
        "JSONFeed"
      ],
      "sources" : [
        "Attachment.swift",
        "Author.swift",
        "Feed.swift",
        "Hub.swift",
        "Item.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" : "JSONFeed",
  "name" : "JSONFeed",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "JSONFeed",
      "targets" : [
        "JSONFeed"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "JSONFeedTests",
      "module_type" : "SwiftTarget",
      "name" : "JSONFeedTests",
      "path" : "Tests/JSONFeedTests",
      "sources" : [
        "JSONFeedTests.swift"
      ],
      "target_dependencies" : [
        "JSONFeed"
      ],
      "type" : "test"
    },
    {
      "c99name" : "JSONFeed",
      "module_type" : "SwiftTarget",
      "name" : "JSONFeed",
      "path" : "Sources/JSONFeed",
      "product_memberships" : [
        "JSONFeed"
      ],
      "sources" : [
        "Attachment.swift",
        "Author.swift",
        "Feed.swift",
        "Hub.swift",
        "Item.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.0"
}
{
  "project" : {
    "configurations" : [
      "Debug",
      "Release"
    ],
    "name" : "JSONFeed",
    "schemes" : [
      "JSONFeed"
    ],
    "targets" : [
      "JSONFeed",
      "JSONFeedPackageDescription",
      "JSONFeedPackageTests",
      "JSONFeedTests"
    ]
  }
}
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-16.3.0.app xcrun xcodebuild -IDEClonedSourcePackagesDirPathOverride=$PWD/.dependencies -skipMacroValidation -skipPackagePluginValidation -derivedDataPath $PWD/.derivedData build -scheme JSONFeed -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 JSONFeed -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
2025-04-24 04:37:25.069 xcodebuild[568:3165] Writing error result bundle to /var/folders/5k/5yc19ymj0jqd5v0zvgfqz0xw0000gn/T/ResultBundle_2025-24-04_04-37-0025.xcresult
xcodebuild: error: Unable to find a destination matching the provided destination specifier:
		{ generic:1, platform:xrOS }
	Available destinations for the "JSONFeed" scheme:
		{ platform:macOS, arch:arm64, id:cdf962fcb9abe17b52dab488bf57e7e8a9a810f1, name:My Mac }
		{ platform:macOS, arch:x86_64, id:cdf962fcb9abe17b52dab488bf57e7e8a9a810f1, 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