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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 Finite, reference master (cbd5de), with Swift 6.1 for macOS (SPM) on 25 Apr 2025 19:16:27 UTC.

Swift 6 data race errors: 4

Build Command

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

Build Log

========================================
RunAll
========================================
Builder version: 4.61.0
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/vknabel/Finite.git
Reference: master
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/vknabel/Finite
 * branch            master     -> FETCH_HEAD
 * [new branch]      master     -> origin/master
HEAD is now at cbd5de6 Improvements for Swift 5.3
Cloned https://github.com/vknabel/Finite.git
Revision (git rev-parse @):
cbd5de6ebbabfb39a730d1357c1c3659f4301c45
SUCCESS checkout https://github.com/vknabel/Finite.git at master
Fetching https://github.com/f-meloni/Rocket.git
Fetching https://github.com/shibapm/PackageConfig.git
Fetching https://github.com/JohnSundell/ShellOut.git
Fetching https://github.com/kareman/SwiftShell
Fetching https://github.com/shibapm/Logger
Fetching https://github.com/nicklockwood/SwiftFormat.git
Fetching https://github.com/jpsim/Yams from cache
[1/116] Fetching logger
[29/4979] Fetching logger, swiftshell
[30/5559] Fetching logger, swiftshell, packageconfig
[298/6519] Fetching logger, swiftshell, packageconfig, shellout
[1075/7905] Fetching logger, swiftshell, packageconfig, shellout, rocket
Fetched https://github.com/shibapm/Logger from cache (0.85s)
Fetched https://github.com/JohnSundell/ShellOut.git from cache (0.85s)
[2171/6829] Fetching swiftshell, packageconfig, rocket
Fetching https://github.com/shibapm/Komondor.git
Fetched https://github.com/f-meloni/Rocket.git from cache (0.90s)
[1650/5443] Fetching swiftshell, packageconfig
[1992/52173] Fetching swiftshell, packageconfig, swiftformat
Fetched https://github.com/jpsim/Yams from cache (1.22s)
[7314/52682] Fetching swiftshell, packageconfig, swiftformat, komondor
Fetched https://github.com/shibapm/Komondor.git from cache (0.77s)
[10116/52173] Fetching swiftshell, packageconfig, swiftformat
Fetched https://github.com/shibapm/PackageConfig.git from cache (21.89s)
Fetched https://github.com/kareman/SwiftShell from cache (21.89s)
Fetched https://github.com/nicklockwood/SwiftFormat.git from cache (21.89s)
Computing version for https://github.com/f-meloni/Rocket.git
Computed https://github.com/f-meloni/Rocket.git at 1.0.0 (22.53s)
Computing version for https://github.com/nicklockwood/SwiftFormat.git
Computed https://github.com/nicklockwood/SwiftFormat.git at 0.43.5 (2.88s)
Computing version for https://github.com/shibapm/Komondor.git
Computed https://github.com/shibapm/Komondor.git at 1.0.4 (0.61s)
Computing version for https://github.com/shibapm/PackageConfig.git
Computed https://github.com/shibapm/PackageConfig.git at 0.13.0 (0.60s)
Computing version for https://github.com/kareman/SwiftShell
Computed https://github.com/kareman/SwiftShell at 5.0.1 (0.61s)
Computing version for https://github.com/shibapm/Logger
Computed https://github.com/shibapm/Logger at 0.2.3 (0.59s)
Computing version for https://github.com/jpsim/Yams
Computed https://github.com/jpsim/Yams at 2.0.0 (0.60s)
Computing version for https://github.com/JohnSundell/ShellOut.git
Computed https://github.com/JohnSundell/ShellOut.git at 2.3.0 (0.57s)
Creating working copy for https://github.com/nicklockwood/SwiftFormat.git
Working copy of https://github.com/nicklockwood/SwiftFormat.git resolved at 0.43.5
Creating working copy for https://github.com/shibapm/Logger
Working copy of https://github.com/shibapm/Logger resolved at 0.2.3
Creating working copy for https://github.com/jpsim/Yams
Working copy of https://github.com/jpsim/Yams resolved at 2.0.0
Creating working copy for https://github.com/shibapm/PackageConfig.git
Working copy of https://github.com/shibapm/PackageConfig.git resolved at 0.13.0
Creating working copy for https://github.com/f-meloni/Rocket.git
Working copy of https://github.com/f-meloni/Rocket.git resolved at 1.0.0
Creating working copy for https://github.com/kareman/SwiftShell
Working copy of https://github.com/kareman/SwiftShell resolved at 5.0.1
Creating working copy for https://github.com/JohnSundell/ShellOut.git
Working copy of https://github.com/JohnSundell/ShellOut.git resolved at 2.3.0
Creating working copy for https://github.com/shibapm/Komondor.git
Working copy of https://github.com/shibapm/Komondor.git resolved at 1.0.4
========================================
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": "finite",
      "name": "Finite",
      "url": "https://github.com/vknabel/Finite.git",
      "version": "unspecified",
      "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/Finite",
      "dependencies": [
        {
          "identity": "komondor",
          "name": "Komondor",
          "url": "https://github.com/shibapm/Komondor.git",
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          "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/Komondor",
          "dependencies": [
            {
              "identity": "packageconfig",
              "name": "PackageConfig",
              "url": "https://github.com/shibapm/PackageConfig.git",
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              "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/PackageConfig",
              "dependencies": [
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            {
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              "dependencies": [
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              "dependencies": [
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                  "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/swift-argument-parser",
                  "dependencies": [
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                  "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/swift-syntax",
                  "dependencies": [
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                      "dependencies": [
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                      "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/SWXMLHash",
                      "dependencies": [
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                      "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/Yams",
                      "dependencies": [
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                  "dependencies": [
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                  "dependencies": [
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                  "dependencies": [
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          "name": "Rocket",
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          "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/Rocket",
          "dependencies": [
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              "name": "Yams",
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              "dependencies": [
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              "dependencies": [
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              "dependencies": [
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          ]
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      ]
    }
  ]
}
Fetching https://github.com/vknabel/Finite.git
[1/810] Fetching finite
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Creating working copy for https://github.com/vknabel/Finite.git
Working copy of https://github.com/vknabel/Finite.git resolved at master (cbd5de6)
Downloading binary artifact https://github.com/realm/SwiftLint/releases/download/0.59.1/SwiftLintBinary.artifactbundle.zip
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warning: '.resolve-product-dependencies': dependency 'finite' is not used by any target
Found 3 product dependencies
  - Komondor
  - SwiftFormat
  - Rocket
========================================
Build
========================================
Selected platform:         macosSpm
Swift version:             6.1
Building package at path:  $PWD
https://github.com/vknabel/Finite.git
https://github.com/vknabel/Finite.git
{
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      "url" : "https://github.com/f-meloni/Rocket.git"
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  "manifest_display_name" : "Finite",
  "name" : "Finite",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "Finite",
      "targets" : [
        "Finite"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "FiniteTests",
      "module_type" : "SwiftTarget",
      "name" : "FiniteTests",
      "path" : "Tests",
      "sources" : [
        "FiniteTests/StateFlowTests.swift",
        "FiniteTests/StateMachine.swift",
        "FiniteTests/SwiftShim.swift",
        "FiniteTests/TransitionTests.swift",
        "XCTestManifests.swift"
      ],
      "target_dependencies" : [
        "Finite"
      ],
      "type" : "test"
    },
    {
      "c99name" : "Finite",
      "module_type" : "SwiftTarget",
      "name" : "Finite",
      "path" : "Sources",
      "product_memberships" : [
        "Finite"
      ],
      "sources" : [
        "Ref.swift",
        "StateFlow.swift",
        "StateMachine.swift",
        "Transition.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.0"
}
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
[3/7] Compiling Finite Transition.swift
[4/7] Emitting module Finite
/Users/admin/builder/spi-builder-workspace/Sources/Ref.swift:37:25: warning: generic parameter 'T' shadows generic parameter from outer scope with the same name; this is an error in the Swift 6 language mode
 5 | }
 6 |
 7 | internal class Ref<T> {
   |                    `- note: 'T' previously declared here
 8 |     private var value: () -> T?
 9 |
   :
35 |     }
36 |
37 |     private struct Weak<T> {
   |                         `- warning: generic parameter 'T' shadows generic parameter from outer scope with the same name; this is an error in the Swift 6 language mode
38 |         fileprivate weak var value: Box<T>?
39 |     }
/Users/admin/builder/spi-builder-workspace/Sources/Ref.swift:41:23: warning: generic parameter 'T' shadows generic parameter from outer scope with the same name; this is an error in the Swift 6 language mode
 5 | }
 6 |
 7 | internal class Ref<T> {
   |                    `- note: 'T' previously declared here
 8 |     private var value: () -> T?
 9 |
   :
39 |     }
40 |
41 |     private class Box<T>: ReferenceDisposable {
   |                       `- warning: generic parameter 'T' shadows generic parameter from outer scope with the same name; this is an error in the Swift 6 language mode
42 |         var value: T?
43 |
/Users/admin/builder/spi-builder-workspace/Sources/StateMachine.swift:12:10: warning: associated value 'denied(from:to:)' of 'Sendable'-conforming generic enum 'TransitionError' has non-sendable type 'T'; this is an error in the Swift 6 language mode
  8 |
  9 | /// Indicates that a transition failed.
 10 | public enum TransitionError<T: Hashable>: Error {
    |                             `- note: consider making generic parameter 'T' conform to the 'Sendable' protocol
 11 |     /// Represents a tried transition that is not allowed.
 12 |     case denied(from: T, to: T)
    |          `- warning: associated value 'denied(from:to:)' of 'Sendable'-conforming generic enum 'TransitionError' has non-sendable type 'T'; this is an error in the Swift 6 language mode
 13 | }
 14 |
/Users/admin/builder/spi-builder-workspace/Sources/StateMachine.swift:12:10: warning: associated value 'denied(from:to:)' of 'Sendable'-conforming generic enum 'TransitionError' has non-sendable type 'T'; this is an error in the Swift 6 language mode
  8 |
  9 | /// Indicates that a transition failed.
 10 | public enum TransitionError<T: Hashable>: Error {
    |                             `- note: consider making generic parameter 'T' conform to the 'Sendable' protocol
 11 |     /// Represents a tried transition that is not allowed.
 12 |     case denied(from: T, to: T)
    |          `- warning: associated value 'denied(from:to:)' of 'Sendable'-conforming generic enum 'TransitionError' has non-sendable type 'T'; this is an error in the Swift 6 language mode
 13 | }
 14 |
[5/7] Compiling Finite StateFlow.swift
[6/7] Compiling Finite StateMachine.swift
/Users/admin/builder/spi-builder-workspace/Sources/StateMachine.swift:12:10: warning: associated value 'denied(from:to:)' of 'Sendable'-conforming generic enum 'TransitionError' has non-sendable type 'T'; this is an error in the Swift 6 language mode
  8 |
  9 | /// Indicates that a transition failed.
 10 | public enum TransitionError<T: Hashable>: Error {
    |                             `- note: consider making generic parameter 'T' conform to the 'Sendable' protocol
 11 |     /// Represents a tried transition that is not allowed.
 12 |     case denied(from: T, to: T)
    |          `- warning: associated value 'denied(from:to:)' of 'Sendable'-conforming generic enum 'TransitionError' has non-sendable type 'T'; this is an error in the Swift 6 language mode
 13 | }
 14 |
/Users/admin/builder/spi-builder-workspace/Sources/StateMachine.swift:12:10: warning: associated value 'denied(from:to:)' of 'Sendable'-conforming generic enum 'TransitionError' has non-sendable type 'T'; this is an error in the Swift 6 language mode
  8 |
  9 | /// Indicates that a transition failed.
 10 | public enum TransitionError<T: Hashable>: Error {
    |                             `- note: consider making generic parameter 'T' conform to the 'Sendable' protocol
 11 |     /// Represents a tried transition that is not allowed.
 12 |     case denied(from: T, to: T)
    |          `- warning: associated value 'denied(from:to:)' of 'Sendable'-conforming generic enum 'TransitionError' has non-sendable type 'T'; this is an error in the Swift 6 language mode
 13 | }
 14 |
[7/7] Compiling Finite Ref.swift
/Users/admin/builder/spi-builder-workspace/Sources/Ref.swift:37:25: warning: generic parameter 'T' shadows generic parameter from outer scope with the same name; this is an error in the Swift 6 language mode
 5 | }
 6 |
 7 | internal class Ref<T> {
   |                    `- note: 'T' previously declared here
 8 |     private var value: () -> T?
 9 |
   :
35 |     }
36 |
37 |     private struct Weak<T> {
   |                         `- warning: generic parameter 'T' shadows generic parameter from outer scope with the same name; this is an error in the Swift 6 language mode
38 |         fileprivate weak var value: Box<T>?
39 |     }
/Users/admin/builder/spi-builder-workspace/Sources/Ref.swift:41:23: warning: generic parameter 'T' shadows generic parameter from outer scope with the same name; this is an error in the Swift 6 language mode
 5 | }
 6 |
 7 | internal class Ref<T> {
   |                    `- note: 'T' previously declared here
 8 |     private var value: () -> T?
 9 |
   :
39 |     }
40 |
41 |     private class Box<T>: ReferenceDisposable {
   |                       `- warning: generic parameter 'T' shadows generic parameter from outer scope with the same name; this is an error in the Swift 6 language mode
42 |         var value: T?
43 |
Build complete! (3.39s)
Build complete.
{
  "dependencies" : [
    {
      "identity" : "komondor",
      "requirement" : {
        "range" : [
          {
            "lower_bound" : "1.0.4",
            "upper_bound" : "2.0.0"
          }
        ]
      },
      "type" : "sourceControl",
      "url" : "https://github.com/shibapm/Komondor.git"
    },
    {
      "identity" : "swiftformat",
      "requirement" : {
        "range" : [
          {
            "lower_bound" : "0.43.5",
            "upper_bound" : "1.0.0"
          }
        ]
      },
      "type" : "sourceControl",
      "url" : "https://github.com/nicklockwood/SwiftFormat.git"
    },
    {
      "identity" : "rocket",
      "requirement" : {
        "range" : [
          {
            "lower_bound" : "1.0.0",
            "upper_bound" : "2.0.0"
          }
        ]
      },
      "type" : "sourceControl",
      "url" : "https://github.com/f-meloni/Rocket.git"
    }
  ],
  "manifest_display_name" : "Finite",
  "name" : "Finite",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "Finite",
      "targets" : [
        "Finite"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "FiniteTests",
      "module_type" : "SwiftTarget",
      "name" : "FiniteTests",
      "path" : "Tests",
      "sources" : [
        "FiniteTests/StateFlowTests.swift",
        "FiniteTests/StateMachine.swift",
        "FiniteTests/SwiftShim.swift",
        "FiniteTests/TransitionTests.swift",
        "XCTestManifests.swift"
      ],
      "target_dependencies" : [
        "Finite"
      ],
      "type" : "test"
    },
    {
      "c99name" : "Finite",
      "module_type" : "SwiftTarget",
      "name" : "Finite",
      "path" : "Sources",
      "product_memberships" : [
        "Finite"
      ],
      "sources" : [
        "Ref.swift",
        "StateFlow.swift",
        "StateMachine.swift",
        "Transition.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.0"
}
Done.