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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 Prelude, reference 0.1.2 (5f0b12), with Swift 6.1 for macOS (Xcode) using Xcode 16.3 on 26 Apr 2025 16:11:07 UTC.

Build Command

env DEVELOPER_DIR=/Applications/Xcode-16.3.0.app xcrun xcodebuild -IDEClonedSourcePackagesDirPathOverride=$PWD/.dependencies -skipMacroValidation -skipPackagePluginValidation -derivedDataPath $PWD/.derivedData build -scheme Prelude-Package -destination platform=macOS,arch=arm64

Build Log

========================================
RunAll
========================================
Builder version: 4.61.0
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/pointfreeco/swift-prelude.git
Reference: 0.1.2
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/pointfreeco/swift-prelude
 * tag               0.1.2      -> FETCH_HEAD
HEAD is now at 5f0b128 move add/mult precedence to 6 and 7 (#9)
Cloned https://github.com/pointfreeco/swift-prelude.git
Revision (git rev-parse @):
5f0b128bf620e162d574219d3d45b272f19c8423
SUCCESS checkout https://github.com/pointfreeco/swift-prelude.git at 0.1.2
========================================
Build
========================================
Selected platform:         macosXcodebuild
Swift version:             6.1
Building package at path:  $PWD
https://github.com/pointfreeco/swift-prelude.git
https://github.com/pointfreeco/swift-prelude.git
{
  "dependencies" : [
  ],
  "manifest_display_name" : "Prelude",
  "name" : "Prelude",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "Prelude",
      "targets" : [
        "Prelude"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "PreludeTests",
      "module_type" : "SwiftTarget",
      "name" : "PreludeTests",
      "path" : "Tests/PreludeTests",
      "sources" : [
        "ArrayTests.swift",
        "ChoiceTests.swift",
        "EitherTests.swift",
        "FunctionTests.swift",
        "KeyPathTests.swift",
        "MonoidTests.swift",
        "OptionalTests.swift",
        "SemigroupTests.swift",
        "SequenceTests.swift",
        "StringTests.swift",
        "StrongTests.swift",
        "TupleTests.swift",
        "UnitTests.swift"
      ],
      "target_dependencies" : [
        "Prelude"
      ],
      "type" : "test"
    },
    {
      "c99name" : "Prelude",
      "module_type" : "SwiftTarget",
      "name" : "Prelude",
      "path" : "Sources/Prelude",
      "product_memberships" : [
        "Prelude"
      ],
      "sources" : [
        "Array.swift",
        "Choice.swift",
        "Either.swift",
        "Function.swift",
        "KeyPath.swift",
        "Monoid.swift",
        "Operators.swift",
        "Optional.swift",
        "PrecedenceGroups.swift",
        "Semigroup.swift",
        "Sequence.swift",
        "String.swift",
        "Strong.swift",
        "Tuple.swift",
        "Unit.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "4.0"
}
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" : "Prelude",
  "name" : "Prelude",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "Prelude",
      "targets" : [
        "Prelude"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "PreludeTests",
      "module_type" : "SwiftTarget",
      "name" : "PreludeTests",
      "path" : "Tests/PreludeTests",
      "sources" : [
        "ArrayTests.swift",
        "ChoiceTests.swift",
        "EitherTests.swift",
        "FunctionTests.swift",
        "KeyPathTests.swift",
        "MonoidTests.swift",
        "OptionalTests.swift",
        "SemigroupTests.swift",
        "SequenceTests.swift",
        "StringTests.swift",
        "StrongTests.swift",
        "TupleTests.swift",
        "UnitTests.swift"
      ],
      "target_dependencies" : [
        "Prelude"
      ],
      "type" : "test"
    },
    {
      "c99name" : "Prelude",
      "module_type" : "SwiftTarget",
      "name" : "Prelude",
      "path" : "Sources/Prelude",
      "product_memberships" : [
        "Prelude"
      ],
      "sources" : [
        "Array.swift",
        "Choice.swift",
        "Either.swift",
        "Function.swift",
        "KeyPath.swift",
        "Monoid.swift",
        "Operators.swift",
        "Optional.swift",
        "PrecedenceGroups.swift",
        "Semigroup.swift",
        "Sequence.swift",
        "String.swift",
        "Strong.swift",
        "Tuple.swift",
        "Unit.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "4.0"
}
{
  "project" : {
    "configurations" : [
      "Debug",
      "Release"
    ],
    "name" : "Prelude",
    "schemes" : [
      "Prelude-Package",
      "PreludePackageTests"
    ],
    "targets" : [
      "PreludeTests",
      "Prelude",
      "PreludePackageTests"
    ]
  }
}
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-16.3.0.app xcrun xcodebuild -IDEClonedSourcePackagesDirPathOverride=$PWD/.dependencies -skipMacroValidation -skipPackagePluginValidation -derivedDataPath $PWD/.derivedData build -scheme Prelude-Package -destination platform=macOS,arch=arm64 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 Prelude-Package -destination platform=macOS,arch=arm64 "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
ComputePackagePrebuildTargetDependencyGraph
Prepare packages
CreateBuildRequest
SendProjectDescription
CreateBuildOperation
ComputeTargetDependencyGraph
note: Building targets in dependency order
note: Target dependency graph (1 target)
    Target 'Prelude' in project 'Prelude' (no dependencies)
GatherProvisioningInputs
CreateBuildDescription
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/MacOSX.platform/Developer/SDKs/MacOSX15.4.sdk -x c -c /dev/null
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/ld -version_details
Build description signature: 365200d3d5af76b7503ad8b062a9f830
Build description path: /Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex/XCBuildData/365200d3d5af76b7503ad8b062a9f830.xcbuilddata
/Users/admin/builder/spi-builder-workspace/Prelude.xcodeproj: warning: The macOS deployment target 'MACOSX_DEPLOYMENT_TARGET' is set to 10.10, but the range of supported deployment target versions is 10.13 to 15.4.99. (in target 'Prelude' from project 'Prelude')
error: SWIFT_VERSION '3.0' is unsupported, supported versions are: 4.0, 4.2, 5.0, 6.0. (in target 'Prelude' from project 'Prelude')
** BUILD FAILED **
The following build commands failed:
	Building project Prelude with scheme Prelude-Package
(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
resolved source packages:
{
  "dependencies" : [
  ],
  "manifest_display_name" : "Prelude",
  "name" : "Prelude",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "Prelude",
      "targets" : [
        "Prelude"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "PreludeTests",
      "module_type" : "SwiftTarget",
      "name" : "PreludeTests",
      "path" : "Tests/PreludeTests",
      "sources" : [
        "ArrayTests.swift",
        "ChoiceTests.swift",
        "EitherTests.swift",
        "FunctionTests.swift",
        "KeyPathTests.swift",
        "MonoidTests.swift",
        "OptionalTests.swift",
        "SemigroupTests.swift",
        "SequenceTests.swift",
        "StringTests.swift",
        "StrongTests.swift",
        "TupleTests.swift",
        "UnitTests.swift"
      ],
      "target_dependencies" : [
        "Prelude"
      ],
      "type" : "test"
    },
    {
      "c99name" : "Prelude",
      "module_type" : "SwiftTarget",
      "name" : "Prelude",
      "path" : "Sources/Prelude",
      "product_memberships" : [
        "Prelude"
      ],
      "sources" : [
        "Array.swift",
        "Choice.swift",
        "Either.swift",
        "Function.swift",
        "KeyPath.swift",
        "Monoid.swift",
        "Operators.swift",
        "Optional.swift",
        "PrecedenceGroups.swift",
        "Semigroup.swift",
        "Sequence.swift",
        "String.swift",
        "Strong.swift",
        "Tuple.swift",
        "Unit.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "4.0"
}
{
  "project" : {
    "configurations" : [
      "Debug",
      "Release"
    ],
    "name" : "Prelude",
    "schemes" : [
      "Prelude-Package",
      "PreludePackageTests"
    ],
    "targets" : [
      "PreludeTests",
      "Prelude",
      "PreludePackageTests"
    ]
  }
}
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-16.3.0.app xcrun xcodebuild -IDEClonedSourcePackagesDirPathOverride=$PWD/.dependencies -skipMacroValidation -skipPackagePluginValidation -derivedDataPath $PWD/.derivedData build -scheme Prelude-Package -destination platform=macOS,arch=arm64
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 Prelude-Package -destination platform=macOS,arch=arm64
ComputePackagePrebuildTargetDependencyGraph
Prepare packages
CreateBuildRequest
SendProjectDescription
CreateBuildOperation
ComputeTargetDependencyGraph
note: Building targets in dependency order
note: Target dependency graph (1 target)
    Target 'Prelude' in project 'Prelude' (no dependencies)
GatherProvisioningInputs
CreateBuildDescription
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/MacOSX.platform/Developer/SDKs/MacOSX15.4.sdk -x c -c /dev/null
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/ld -version_details
Build description signature: 265cb1512549532261373e376fe9b222
Build description path: /Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex/XCBuildData/265cb1512549532261373e376fe9b222.xcbuilddata
/Users/admin/builder/spi-builder-workspace/Prelude.xcodeproj: warning: The macOS deployment target 'MACOSX_DEPLOYMENT_TARGET' is set to 10.10, but the range of supported deployment target versions is 10.13 to 15.4.99. (in target 'Prelude' from project 'Prelude')
error: SWIFT_VERSION '3.0' is unsupported, supported versions are: 4.0, 4.2, 5.0, 6.0. (in target 'Prelude' from project 'Prelude')
** BUILD FAILED **
The following build commands failed:
	Building project Prelude with scheme Prelude-Package
(1 failure)
BUILD FAILURE 6.1 macosXcodebuild