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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 Slab, reference develop (cddcfa), with Swift 6.1 for watchOS using Xcode 16.3 on 26 Apr 2025 16:32:29 UTC.

Build Command

env DEVELOPER_DIR=/Applications/Xcode-16.3.0.app xcrun xcodebuild -IDEClonedSourcePackagesDirPathOverride=$PWD/.dependencies -skipMacroValidation -skipPackagePluginValidation -derivedDataPath $PWD/.derivedData build -scheme Slab -destination generic/platform=watchOS

Build Log

========================================
RunAll
========================================
Builder version: 4.61.0
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/ptrkstr/Slab.git
Reference: develop
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/ptrkstr/Slab
 * branch            develop    -> FETCH_HEAD
 * [new branch]      develop    -> origin/develop
HEAD is now at cddcfa9 Update readme
Cloned https://github.com/ptrkstr/Slab.git
Revision (git rev-parse @):
cddcfa99626ec372f31f935b85103aaf8769f4ca
SUCCESS checkout https://github.com/ptrkstr/Slab.git at develop
========================================
Build
========================================
Selected platform:         watchOS
Swift version:             6.1
Building package at path:  $PWD
https://github.com/ptrkstr/Slab.git
https://github.com/ptrkstr/Slab.git
{
  "dependencies" : [
    {
      "identity" : "swiftsoup",
      "requirement" : {
        "range" : [
          {
            "lower_bound" : "2.0.0",
            "upper_bound" : "3.0.0"
          }
        ]
      },
      "type" : "sourceControl",
      "url" : "https://github.com/scinfu/SwiftSoup"
    },
    {
      "identity" : "swift-collections",
      "requirement" : {
        "range" : [
          {
            "lower_bound" : "1.0.0",
            "upper_bound" : "2.0.0"
          }
        ]
      },
      "type" : "sourceControl",
      "url" : "https://github.com/apple/swift-collections.git"
    }
  ],
  "manifest_display_name" : "Slab",
  "name" : "Slab",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "Slab",
      "targets" : [
        "Slab"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "SlabTests",
      "module_type" : "SwiftTarget",
      "name" : "SlabTests",
      "path" : "Tests/SlabTests",
      "sources" : [
        "SlabTests.swift"
      ],
      "target_dependencies" : [
        "Slab"
      ],
      "type" : "test"
    },
    {
      "c99name" : "Slab",
      "module_type" : "SwiftTarget",
      "name" : "Slab",
      "path" : "Sources/Slab",
      "product_dependencies" : [
        "SwiftSoup",
        "Collections"
      ],
      "product_memberships" : [
        "Slab"
      ],
      "sources" : [
        "Configuration.swift",
        "Slab.swift",
        "SlabError.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.3"
}
Command line invocation:
    /Applications/Xcode-16.3.0.app/Contents/Developer/usr/bin/xcodebuild -IDEClonedSourcePackagesDirPathOverride=/Users/admin/builder/spi-builder-workspace/.dependencies -resolvePackageDependencies
Resolve Package Graph
Fetching from https://github.com/scinfu/SwiftSoup
Fetching from https://github.com/apple/swift-collections.git (cached)
Creating working copy of package ‘swift-collections’
Checking out 1.1.4 of package ‘swift-collections’
Creating working copy of package ‘SwiftSoup’
Checking out 2.8.7 of package ‘SwiftSoup’
Resolve Package Graph
Resolve Package Graph
Resolved source packages:
  Slab: /Users/admin/builder/spi-builder-workspace
  SwiftSoup: https://github.com/scinfu/SwiftSoup @ 2.8.7
  swift-collections: https://github.com/apple/swift-collections.git @ 1.1.4
resolved source packages: Slab, SwiftSoup, swift-collections
{
  "dependencies" : [
    {
      "identity" : "swiftsoup",
      "requirement" : {
        "range" : [
          {
            "lower_bound" : "2.0.0",
            "upper_bound" : "3.0.0"
          }
        ]
      },
      "type" : "sourceControl",
      "url" : "https://github.com/scinfu/SwiftSoup"
    },
    {
      "identity" : "swift-collections",
      "requirement" : {
        "range" : [
          {
            "lower_bound" : "1.0.0",
            "upper_bound" : "2.0.0"
          }
        ]
      },
      "type" : "sourceControl",
      "url" : "https://github.com/apple/swift-collections.git"
    }
  ],
  "manifest_display_name" : "Slab",
  "name" : "Slab",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "Slab",
      "targets" : [
        "Slab"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "SlabTests",
      "module_type" : "SwiftTarget",
      "name" : "SlabTests",
      "path" : "Tests/SlabTests",
      "sources" : [
        "SlabTests.swift"
      ],
      "target_dependencies" : [
        "Slab"
      ],
      "type" : "test"
    },
    {
      "c99name" : "Slab",
      "module_type" : "SwiftTarget",
      "name" : "Slab",
      "path" : "Sources/Slab",
      "product_dependencies" : [
        "SwiftSoup",
        "Collections"
      ],
      "product_memberships" : [
        "Slab"
      ],
      "sources" : [
        "Configuration.swift",
        "Slab.swift",
        "SlabError.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.3"
}
{
  "workspace" : {
    "name" : "spi-builder-workspace",
    "schemes" : [
      "Slab"
    ]
  }
}
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-16.3.0.app xcrun xcodebuild -IDEClonedSourcePackagesDirPathOverride=$PWD/.dependencies -skipMacroValidation -skipPackagePluginValidation -derivedDataPath $PWD/.derivedData build -scheme Slab -destination generic/platform=watchOS 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 Slab -destination generic/platform=watchOS "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
Resolve Package Graph
Resolve Package Graph
Resolved source packages:
  Slab: /Users/admin/builder/spi-builder-workspace
  SwiftSoup: https://github.com/scinfu/SwiftSoup @ 2.8.7
  swift-collections: https://github.com/apple/swift-collections.git @ 1.1.4
ComputePackagePrebuildTargetDependencyGraph
Prepare packages
CreateBuildRequest
SendProjectDescription
CreateBuildOperation
ComputeTargetDependencyGraph
note: Building targets in dependency order
note: Target dependency graph (14 targets)
    Target 'SlabTests' in project 'Slab'
        ➜ Explicit dependency on target 'Slab' in project 'Slab'
        ➜ Explicit dependency on target 'SwiftSoup' in project 'SwiftSoup'
        ➜ Explicit dependency on target 'Collections' in project 'swift-collections'
    Target 'Slab' in project 'Slab'
        ➜ Explicit dependency on target 'Slab' in project 'Slab'
        ➜ Explicit dependency on target 'SwiftSoup' in project 'SwiftSoup'
        ➜ Explicit dependency on target 'Collections' in project 'swift-collections'
    Target 'Slab' in project 'Slab'
        ➜ Explicit dependency on target 'SwiftSoup' in project 'SwiftSoup'
        ➜ Explicit dependency on target 'Collections' in project 'swift-collections'
    Target 'Collections' in project 'swift-collections'
        ➜ Explicit dependency on target 'Collections' in project 'swift-collections'
        ➜ Explicit dependency on target 'InternalCollectionsUtilities' in project 'swift-collections'
        ➜ Explicit dependency on target 'BitCollections' in project 'swift-collections'
        ➜ Explicit dependency on target 'DequeModule' in project 'swift-collections'
        ➜ Explicit dependency on target 'HashTreeCollections' in project 'swift-collections'
        ➜ Explicit dependency on target 'HeapModule' in project 'swift-collections'
        ➜ Explicit dependency on target 'OrderedCollections' in project 'swift-collections'
        ➜ Explicit dependency on target '_RopeModule' in project 'swift-collections'
    Target 'Collections' in project 'swift-collections'
        ➜ Explicit dependency on target 'InternalCollectionsUtilities' in project 'swift-collections'
        ➜ Explicit dependency on target 'BitCollections' in project 'swift-collections'
        ➜ Explicit dependency on target 'DequeModule' in project 'swift-collections'
        ➜ Explicit dependency on target 'HashTreeCollections' in project 'swift-collections'
        ➜ Explicit dependency on target 'HeapModule' in project 'swift-collections'
        ➜ Explicit dependency on target 'OrderedCollections' in project 'swift-collections'
        ➜ Explicit dependency on target '_RopeModule' in project 'swift-collections'
    Target '_RopeModule' in project 'swift-collections'
        ➜ Explicit dependency on target 'InternalCollectionsUtilities' in project 'swift-collections'
    Target 'OrderedCollections' in project 'swift-collections'
        ➜ Explicit dependency on target 'InternalCollectionsUtilities' in project 'swift-collections'
    Target 'HeapModule' in project 'swift-collections'
        ➜ Explicit dependency on target 'InternalCollectionsUtilities' in project 'swift-collections'
    Target 'HashTreeCollections' in project 'swift-collections'
        ➜ Explicit dependency on target 'InternalCollectionsUtilities' in project 'swift-collections'
    Target 'DequeModule' in project 'swift-collections'
        ➜ Explicit dependency on target 'InternalCollectionsUtilities' in project 'swift-collections'
    Target 'BitCollections' in project 'swift-collections'
        ➜ Explicit dependency on target 'InternalCollectionsUtilities' in project 'swift-collections'
    Target 'InternalCollectionsUtilities' in project 'swift-collections' (no dependencies)
    Target 'SwiftSoup' in project 'SwiftSoup'
        ➜ Explicit dependency on target 'SwiftSoup' in project 'SwiftSoup'
    Target 'SwiftSoup' in project 'SwiftSoup' (no dependencies)
GatherProvisioningInputs
CreateBuildDescription
ExecuteExternalTool /Applications/Xcode-16.3.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swiftc --version
ExecuteExternalTool /Applications/Xcode-16.3.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -v -E -dM -isysroot /Applications/Xcode-16.3.0.app/Contents/Developer/Platforms/WatchOS.platform/Developer/SDKs/WatchOS11.4.sdk -x c -c /dev/null
ExecuteExternalTool /Applications/Xcode-16.3.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ld -version_details
ReadFileContents /Applications/Xcode-16.3.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/share/docc/features.json
Build description signature: 9e2efe0e554ed6f8ebb03fd5f821b905
Build description path: /Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex/XCBuildData/9e2efe0e554ed6f8ebb03fd5f821b905.xcbuilddata
error: The package product 'SwiftSoup' requires minimum platform version 6.0 for the watchOS platform, but this target supports 5.0 (in target 'Slab' from project 'Slab')
** BUILD FAILED **
The following build commands failed:
	Building workspace spi-builder-workspace with scheme Slab
(1 failure)
Command line invocation:
    /Applications/Xcode-16.3.0.app/Contents/Developer/usr/bin/xcodebuild -IDEClonedSourcePackagesDirPathOverride=/Users/admin/builder/spi-builder-workspace/.dependencies -resolvePackageDependencies
Resolve Package Graph
Resolved source packages:
  SwiftSoup: https://github.com/scinfu/SwiftSoup @ 2.8.7
  Slab: /Users/admin/builder/spi-builder-workspace
  swift-collections: https://github.com/apple/swift-collections.git @ 1.1.4
resolved source packages: SwiftSoup, Slab, swift-collections
{
  "dependencies" : [
    {
      "identity" : "swiftsoup",
      "requirement" : {
        "range" : [
          {
            "lower_bound" : "2.0.0",
            "upper_bound" : "3.0.0"
          }
        ]
      },
      "type" : "sourceControl",
      "url" : "https://github.com/scinfu/SwiftSoup"
    },
    {
      "identity" : "swift-collections",
      "requirement" : {
        "range" : [
          {
            "lower_bound" : "1.0.0",
            "upper_bound" : "2.0.0"
          }
        ]
      },
      "type" : "sourceControl",
      "url" : "https://github.com/apple/swift-collections.git"
    }
  ],
  "manifest_display_name" : "Slab",
  "name" : "Slab",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "Slab",
      "targets" : [
        "Slab"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "SlabTests",
      "module_type" : "SwiftTarget",
      "name" : "SlabTests",
      "path" : "Tests/SlabTests",
      "sources" : [
        "SlabTests.swift"
      ],
      "target_dependencies" : [
        "Slab"
      ],
      "type" : "test"
    },
    {
      "c99name" : "Slab",
      "module_type" : "SwiftTarget",
      "name" : "Slab",
      "path" : "Sources/Slab",
      "product_dependencies" : [
        "SwiftSoup",
        "Collections"
      ],
      "product_memberships" : [
        "Slab"
      ],
      "sources" : [
        "Configuration.swift",
        "Slab.swift",
        "SlabError.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.3"
}
{
  "workspace" : {
    "name" : "spi-builder-workspace",
    "schemes" : [
      "Slab"
    ]
  }
}
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-16.3.0.app xcrun xcodebuild -IDEClonedSourcePackagesDirPathOverride=$PWD/.dependencies -skipMacroValidation -skipPackagePluginValidation -derivedDataPath $PWD/.derivedData build -scheme Slab -destination generic/platform=watchOS
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 Slab -destination generic/platform=watchOS
Resolve Package Graph
Resolved source packages:
  Slab: /Users/admin/builder/spi-builder-workspace
  SwiftSoup: https://github.com/scinfu/SwiftSoup @ 2.8.7
  swift-collections: https://github.com/apple/swift-collections.git @ 1.1.4
ComputePackagePrebuildTargetDependencyGraph
Prepare packages
CreateBuildRequest
SendProjectDescription
CreateBuildOperation
ComputeTargetDependencyGraph
note: Building targets in dependency order
note: Target dependency graph (14 targets)
    Target 'SlabTests' in project 'Slab'
        ➜ Explicit dependency on target 'Slab' in project 'Slab'
        ➜ Explicit dependency on target 'SwiftSoup' in project 'SwiftSoup'
        ➜ Explicit dependency on target 'Collections' in project 'swift-collections'
    Target 'Slab' in project 'Slab'
        ➜ Explicit dependency on target 'Slab' in project 'Slab'
        ➜ Explicit dependency on target 'SwiftSoup' in project 'SwiftSoup'
        ➜ Explicit dependency on target 'Collections' in project 'swift-collections'
    Target 'Slab' in project 'Slab'
        ➜ Explicit dependency on target 'SwiftSoup' in project 'SwiftSoup'
        ➜ Explicit dependency on target 'Collections' in project 'swift-collections'
    Target 'Collections' in project 'swift-collections'
        ➜ Explicit dependency on target 'Collections' in project 'swift-collections'
        ➜ Explicit dependency on target 'InternalCollectionsUtilities' in project 'swift-collections'
        ➜ Explicit dependency on target 'BitCollections' in project 'swift-collections'
        ➜ Explicit dependency on target 'DequeModule' in project 'swift-collections'
        ➜ Explicit dependency on target 'HashTreeCollections' in project 'swift-collections'
        ➜ Explicit dependency on target 'HeapModule' in project 'swift-collections'
        ➜ Explicit dependency on target 'OrderedCollections' in project 'swift-collections'
        ➜ Explicit dependency on target '_RopeModule' in project 'swift-collections'
    Target 'Collections' in project 'swift-collections'
        ➜ Explicit dependency on target 'InternalCollectionsUtilities' in project 'swift-collections'
        ➜ Explicit dependency on target 'BitCollections' in project 'swift-collections'
        ➜ Explicit dependency on target 'DequeModule' in project 'swift-collections'
        ➜ Explicit dependency on target 'HashTreeCollections' in project 'swift-collections'
        ➜ Explicit dependency on target 'HeapModule' in project 'swift-collections'
        ➜ Explicit dependency on target 'OrderedCollections' in project 'swift-collections'
        ➜ Explicit dependency on target '_RopeModule' in project 'swift-collections'
    Target '_RopeModule' in project 'swift-collections'
        ➜ Explicit dependency on target 'InternalCollectionsUtilities' in project 'swift-collections'
    Target 'OrderedCollections' in project 'swift-collections'
        ➜ Explicit dependency on target 'InternalCollectionsUtilities' in project 'swift-collections'
    Target 'HeapModule' in project 'swift-collections'
        ➜ Explicit dependency on target 'InternalCollectionsUtilities' in project 'swift-collections'
    Target 'HashTreeCollections' in project 'swift-collections'
        ➜ Explicit dependency on target 'InternalCollectionsUtilities' in project 'swift-collections'
    Target 'DequeModule' in project 'swift-collections'
        ➜ Explicit dependency on target 'InternalCollectionsUtilities' in project 'swift-collections'
    Target 'BitCollections' in project 'swift-collections'
        ➜ Explicit dependency on target 'InternalCollectionsUtilities' in project 'swift-collections'
    Target 'InternalCollectionsUtilities' in project 'swift-collections' (no dependencies)
    Target 'SwiftSoup' in project 'SwiftSoup'
        ➜ Explicit dependency on target 'SwiftSoup' in project 'SwiftSoup'
    Target 'SwiftSoup' in project 'SwiftSoup' (no dependencies)
GatherProvisioningInputs
CreateBuildDescription
ExecuteExternalTool /Applications/Xcode-16.3.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swiftc --version
ExecuteExternalTool /Applications/Xcode-16.3.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -v -E -dM -isysroot /Applications/Xcode-16.3.0.app/Contents/Developer/Platforms/WatchOS.platform/Developer/SDKs/WatchOS11.4.sdk -x c -c /dev/null
ExecuteExternalTool /Applications/Xcode-16.3.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ld -version_details
ReadFileContents /Applications/Xcode-16.3.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/share/docc/features.json
Build description signature: 4100fcd7acb5179fa177d0d47f2c9f17
Build description path: /Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex/XCBuildData/4100fcd7acb5179fa177d0d47f2c9f17.xcbuilddata
error: The package product 'SwiftSoup' requires minimum platform version 6.0 for the watchOS platform, but this target supports 5.0 (in target 'Slab' from project 'Slab')
** BUILD FAILED **
The following build commands failed:
	Building workspace spi-builder-workspace with scheme Slab
(1 failure)
BUILD FAILURE 6.1 watchOS