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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

Successful build of Commandant, reference master (0a192d), with Swift 6.1 for macOS (SPM) on 26 Apr 2025 08:46:31 UTC.

Swift 6 data race errors: 1

Build Command

env DEVELOPER_DIR=/Applications/Xcode-16.3.0.app xcrun swift build --arch arm64

Build Log

========================================
RunAll
========================================
Builder version: 4.61.0
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/Carthage/Commandant.git
Reference: master
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/Carthage/Commandant
 * branch            master     -> FETCH_HEAD
 * [new branch]      master     -> origin/master
HEAD is now at 0a192d3 Merge pull request #156 from Carthage/module-stability
Submodule path 'Carthage/Checkouts/Nimble': checked out 'e491a6731307bb23783bf664d003be9b2fa59ab5'
Submodule path 'Carthage/Checkouts/Quick': checked out '8a10ae40b78d2360ca56638f15fe721be8529993'
Submodule path 'Carthage/Checkouts/Quick/Externals/Nimble': checked out 'e491a6731307bb23783bf664d003be9b2fa59ab5'
Submodule path 'Carthage/Checkouts/xcconfigs': checked out '4ced0ad5a971220917994a4edfa6abf9702e3818'
Submodule 'Carthage/Checkouts/Nimble' (https://github.com/Quick/Nimble.git) registered for path 'Carthage/Checkouts/Nimble'
Submodule 'Carthage/Checkouts/Quick' (https://github.com/Quick/Quick.git) registered for path 'Carthage/Checkouts/Quick'
Submodule 'Carthage/Checkouts/xcconfigs' (https://github.com/jspahrsummers/xcconfigs.git) registered for path 'Carthage/Checkouts/xcconfigs'
Cloning into '/Users/admin/builder/spi-builder-workspace/Carthage/Checkouts/Nimble'...
Cloning into '/Users/admin/builder/spi-builder-workspace/Carthage/Checkouts/Quick'...
Cloning into '/Users/admin/builder/spi-builder-workspace/Carthage/Checkouts/xcconfigs'...
Submodule 'Externals/Nimble' (https://github.com/Quick/Nimble.git) registered for path 'Carthage/Checkouts/Quick/Externals/Nimble'
Cloning into '/Users/admin/builder/spi-builder-workspace/Carthage/Checkouts/Quick/Externals/Nimble'...
Cloned https://github.com/Carthage/Commandant.git
Revision (git rev-parse @):
0a192d39714dff52b48ca88795ad6175119fc120
SUCCESS checkout https://github.com/Carthage/Commandant.git at master
Fetching https://github.com/mattgallagher/CwlPreconditionTesting.git
Fetching https://github.com/Quick/Quick.git
Fetching https://github.com/mattgallagher/CwlCatchException.git
Fetching https://github.com/Quick/Nimble.git
[1/455] Fetching cwlcatchexception
[284/1712] Fetching cwlcatchexception, cwlpreconditiontesting
[947/16467] Fetching cwlcatchexception, cwlpreconditiontesting, quick
[2009/36034] Fetching cwlcatchexception, cwlpreconditiontesting, quick, nimble
Fetched https://github.com/Quick/Quick.git from cache (1.45s)
[5039/21279] Fetching cwlcatchexception, cwlpreconditiontesting, nimble
Fetched https://github.com/mattgallagher/CwlCatchException.git from cache (1.77s)
Fetched https://github.com/mattgallagher/CwlPreconditionTesting.git from cache (1.77s)
Fetched https://github.com/Quick/Nimble.git from cache (1.77s)
Computing version for https://github.com/Quick/Nimble.git
Computed https://github.com/Quick/Nimble.git at 9.0.0 (2.41s)
Computing version for https://github.com/Quick/Quick.git
Computed https://github.com/Quick/Quick.git at 3.1.0 (0.59s)
Computing version for https://github.com/mattgallagher/CwlPreconditionTesting.git
Computed https://github.com/mattgallagher/CwlPreconditionTesting.git at 2.0.0 (0.58s)
Computing version for https://github.com/mattgallagher/CwlCatchException.git
Computed https://github.com/mattgallagher/CwlCatchException.git at 2.0.0 (0.57s)
Creating working copy for https://github.com/mattgallagher/CwlCatchException.git
Working copy of https://github.com/mattgallagher/CwlCatchException.git resolved at 2.0.0
Creating working copy for https://github.com/mattgallagher/CwlPreconditionTesting.git
Working copy of https://github.com/mattgallagher/CwlPreconditionTesting.git resolved at 2.0.0
Creating working copy for https://github.com/Quick/Quick.git
Working copy of https://github.com/Quick/Quick.git resolved at 3.1.0
Creating working copy for https://github.com/Quick/Nimble.git
Working copy of https://github.com/Quick/Nimble.git resolved at 9.0.0
========================================
ResolveProductDependencies
========================================
Resolving dependencies ...
{
  "identity": ".resolve-product-dependencies",
  "name": "resolve-dependencies",
  "url": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies",
  "version": "unspecified",
  "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies",
  "dependencies": [
    {
      "identity": "commandant",
      "name": "Commandant",
      "url": "https://github.com/Carthage/Commandant.git",
      "version": "unspecified",
      "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/Commandant",
      "dependencies": [
      ]
    }
  ]
}
Fetching https://github.com/Carthage/Commandant.git
[1/2329] Fetching commandant
Fetched https://github.com/Carthage/Commandant.git from cache (0.88s)
Creating working copy for https://github.com/Carthage/Commandant.git
Working copy of https://github.com/Carthage/Commandant.git resolved at master (0a192d3)
warning: '.resolve-product-dependencies': dependency 'commandant' is not used by any target
Found 0 product dependencies
========================================
Build
========================================
Selected platform:         macosSpm
Swift version:             6.1
Building package at path:  $PWD
https://github.com/Carthage/Commandant.git
https://github.com/Carthage/Commandant.git
{
  "dependencies" : [
    {
      "identity" : "quick",
      "requirement" : {
        "range" : [
          {
            "lower_bound" : "3.1.0",
            "upper_bound" : "4.0.0"
          }
        ]
      },
      "type" : "sourceControl",
      "url" : "https://github.com/Quick/Quick.git"
    },
    {
      "identity" : "nimble",
      "requirement" : {
        "range" : [
          {
            "lower_bound" : "9.0.0",
            "upper_bound" : "10.0.0"
          }
        ]
      },
      "type" : "sourceControl",
      "url" : "https://github.com/Quick/Nimble.git"
    }
  ],
  "manifest_display_name" : "Commandant",
  "name" : "Commandant",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "Commandant",
      "targets" : [
        "Commandant"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "swift_languages_versions" : [
    "5"
  ],
  "targets" : [
    {
      "c99name" : "CommandantTests",
      "module_type" : "SwiftTarget",
      "name" : "CommandantTests",
      "path" : "Tests/CommandantTests",
      "product_dependencies" : [
        "Quick",
        "Nimble"
      ],
      "sources" : [
        "CommandSpec.swift",
        "OptionSpec.swift",
        "OptionsWithEnumProtocolSpec.swift",
        "OrderedSetSpec.swift"
      ],
      "target_dependencies" : [
        "Commandant"
      ],
      "type" : "test"
    },
    {
      "c99name" : "Commandant",
      "module_type" : "SwiftTarget",
      "name" : "Commandant",
      "path" : "Sources/Commandant",
      "product_memberships" : [
        "Commandant"
      ],
      "sources" : [
        "Argument.swift",
        "ArgumentParser.swift",
        "ArgumentProtocol.swift",
        "Command.swift",
        "Errors.swift",
        "HelpCommand.swift",
        "Option.swift",
        "OrderedSet.swift",
        "Result+Additions.swift",
        "Switch.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.2"
}
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-16.3.0.app xcrun swift build --arch arm64 -Xswiftc -Xfrontend -Xswiftc -stats-output-dir -Xswiftc -Xfrontend -Xswiftc .stats -Xswiftc -strict-concurrency=complete -Xswiftc -enable-upcoming-feature -Xswiftc StrictConcurrency -Xswiftc -enable-upcoming-feature -Xswiftc DisableOutwardActorInference -Xswiftc -enable-upcoming-feature -Xswiftc GlobalActorIsolatedTypesUsability -Xswiftc -enable-upcoming-feature -Xswiftc InferSendableFromCaptures
Building for debugging...
[0/2] Write sources
[1/2] Write swift-version-2F0A5646E1D333AE.txt
[3/12] Compiling Commandant HelpCommand.swift
[4/12] Compiling Commandant Errors.swift
/Users/admin/builder/spi-builder-workspace/Sources/Commandant/Errors.swift:20:7: warning: associated value 'commandError' of 'Sendable'-conforming generic enum 'CommandantError' has non-sendable type 'ClientError'; this is an error in the Swift 6 language mode
 13 | /// `ClientError` should be the type of error (if any) that can occur when
 14 | /// running commands.
 15 | public enum CommandantError<ClientError>: Error {
    |                             `- note: consider making generic parameter 'ClientError' conform to the 'Sendable' protocol
 16 | 	/// An option was used incorrectly.
 17 | 	case usageError(description: String)
 18 |
 19 | 	/// An error occurred while running a command.
 20 | 	case commandError(ClientError)
    |       `- warning: associated value 'commandError' of 'Sendable'-conforming generic enum 'CommandantError' has non-sendable type 'ClientError'; this is an error in the Swift 6 language mode
 21 | }
 22 |
[5/12] Compiling Commandant OrderedSet.swift
[6/12] Compiling Commandant Command.swift
[7/12] Compiling Commandant Result+Additions.swift
[8/12] Compiling Commandant Option.swift
/Users/admin/builder/spi-builder-workspace/Sources/Commandant/Option.swift:239:32: error: instance method 'contains' requires that 'String.Element' (aka 'Character') conform to 'Collection'
237 | 			let components = unwrappedStringValue.split(
238 | 				omittingEmptySubsequences: true,
239 | 				whereSeparator: [",", " "].contains
    |                                `- error: instance method 'contains' requires that 'String.Element' (aka 'Character') conform to 'Collection'
240 | 			)
241 | 			var resultValues: [T] = []
_StringProcessing.Collection.contains:3:15: note: where 'C' = 'String.Element' (aka 'Character')
1 | protocol Collection {
2 | @available(macOS 13.0, iOS 16.0, watchOS 9.0, tvOS 16.0, *)
3 |   public func contains<C>(_ other: C) -> Bool where C : Collection, Self.Element == C.Element}
  |               `- note: where 'C' = 'String.Element' (aka 'Character')
4 |
[9/13] Compiling Commandant ArgumentProtocol.swift
[10/13] Compiling Commandant Argument.swift
[11/13] Emitting module Commandant
/Users/admin/builder/spi-builder-workspace/Sources/Commandant/Errors.swift:20:7: warning: associated value 'commandError' of 'Sendable'-conforming generic enum 'CommandantError' has non-sendable type 'ClientError'; this is an error in the Swift 6 language mode
 13 | /// `ClientError` should be the type of error (if any) that can occur when
 14 | /// running commands.
 15 | public enum CommandantError<ClientError>: Error {
    |                             `- note: consider making generic parameter 'ClientError' conform to the 'Sendable' protocol
 16 | 	/// An option was used incorrectly.
 17 | 	case usageError(description: String)
 18 |
 19 | 	/// An error occurred while running a command.
 20 | 	case commandError(ClientError)
    |       `- warning: associated value 'commandError' of 'Sendable'-conforming generic enum 'CommandantError' has non-sendable type 'ClientError'; this is an error in the Swift 6 language mode
 21 | }
 22 |
[12/13] Compiling Commandant ArgumentParser.swift
[13/13] Compiling Commandant Switch.swift
warning: 'quick': found 1 file(s) which are unhandled; explicitly declare them as resources or exclude from the target
    /Users/admin/builder/spi-builder-workspace/.build/checkouts/Quick/Sources/Quick/Info.plist
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-16.3.0.app xcrun swift build --arch arm64
[0/1] Planning build
Building for debugging...
[0/1] Write swift-version-2F0A5646E1D333AE.txt
[2/11] Compiling Commandant OrderedSet.swift
[3/12] Compiling Commandant Option.swift
[4/12] Compiling Commandant Result+Additions.swift
[5/12] Compiling Commandant Errors.swift
[6/12] Compiling Commandant HelpCommand.swift
[7/12] Compiling Commandant Command.swift
[8/12] Compiling Commandant ArgumentProtocol.swift
[9/12] Compiling Commandant Argument.swift
[10/12] Emitting module Commandant
[11/12] Compiling Commandant ArgumentParser.swift
[12/12] Compiling Commandant Switch.swift
Build complete! (1.55s)
warning: 'quick': found 1 file(s) which are unhandled; explicitly declare them as resources or exclude from the target
    /Users/admin/builder/spi-builder-workspace/.build/checkouts/Quick/Sources/Quick/Info.plist
Build complete.
{
  "dependencies" : [
    {
      "identity" : "quick",
      "requirement" : {
        "range" : [
          {
            "lower_bound" : "3.1.0",
            "upper_bound" : "4.0.0"
          }
        ]
      },
      "type" : "sourceControl",
      "url" : "https://github.com/Quick/Quick.git"
    },
    {
      "identity" : "nimble",
      "requirement" : {
        "range" : [
          {
            "lower_bound" : "9.0.0",
            "upper_bound" : "10.0.0"
          }
        ]
      },
      "type" : "sourceControl",
      "url" : "https://github.com/Quick/Nimble.git"
    }
  ],
  "manifest_display_name" : "Commandant",
  "name" : "Commandant",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "Commandant",
      "targets" : [
        "Commandant"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "swift_languages_versions" : [
    "5"
  ],
  "targets" : [
    {
      "c99name" : "CommandantTests",
      "module_type" : "SwiftTarget",
      "name" : "CommandantTests",
      "path" : "Tests/CommandantTests",
      "product_dependencies" : [
        "Quick",
        "Nimble"
      ],
      "sources" : [
        "CommandSpec.swift",
        "OptionSpec.swift",
        "OptionsWithEnumProtocolSpec.swift",
        "OrderedSetSpec.swift"
      ],
      "target_dependencies" : [
        "Commandant"
      ],
      "type" : "test"
    },
    {
      "c99name" : "Commandant",
      "module_type" : "SwiftTarget",
      "name" : "Commandant",
      "path" : "Sources/Commandant",
      "product_memberships" : [
        "Commandant"
      ],
      "sources" : [
        "Argument.swift",
        "ArgumentParser.swift",
        "ArgumentProtocol.swift",
        "Command.swift",
        "Errors.swift",
        "HelpCommand.swift",
        "Option.swift",
        "OrderedSet.swift",
        "Result+Additions.swift",
        "Switch.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.2"
}
Done.