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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 LetterCase, reference 2.0.0 (8db2ad), with Swift 6.1 for macOS (SPM) on 30 Apr 2025 09:17:55 UTC.

Swift 6 data race errors: 3

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: 4.61.1
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/rwbutler/LetterCase.git
Reference: 2.0.0
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/rwbutler/LetterCase
 * tag               2.0.0      -> FETCH_HEAD
HEAD is now at 8db2adb Updated pods
Cloned https://github.com/rwbutler/LetterCase.git
Revision (git rev-parse @):
8db2adb8cfb9431e25ceed1a6904eda580ffd22b
SUCCESS checkout https://github.com/rwbutler/LetterCase.git at 2.0.0
========================================
Build
========================================
Selected platform:         macosSpm
Swift version:             6.1
Building package at path:  $PWD
https://github.com/rwbutler/LetterCase.git
https://github.com/rwbutler/LetterCase.git
{
  "dependencies" : [
  ],
  "manifest_display_name" : "LetterCase",
  "name" : "LetterCase",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "LetterCase",
      "targets" : [
        "LetterCase"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "LetterCase",
      "module_type" : "SwiftTarget",
      "name" : "LetterCase",
      "path" : "LetterCase/Classes",
      "product_memberships" : [
        "LetterCase"
      ],
      "sources" : [
        "KeyDecodingStrategyAdditions.swift",
        "LetterCase.swift",
        "LetterCaseOptions.swift",
        "StringAdditions.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "4.2"
}
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
[3/7] Compiling LetterCase LetterCase.swift
[4/7] Compiling LetterCase KeyDecodingStrategyAdditions.swift
/Users/admin/builder/spi-builder-workspace/LetterCase/Classes/KeyDecodingStrategyAdditions.swift:65:70: warning: capture of 'letterCase' with non-sendable type 'LetterCase' in a '@Sendable' closure
 63 |                 return lastKey
 64 |             }
 65 |             let newLetterCaseKey = lastKey.stringValue.convert(from: letterCase, to: newLetterCase)
    |                                                                      `- warning: capture of 'letterCase' with non-sendable type 'LetterCase' in a '@Sendable' closure
 66 |             return AnyKey(string: newLetterCaseKey)
 67 |         }
/Users/admin/builder/spi-builder-workspace/LetterCase/Classes/LetterCase.swift:10:13: note: consider making enum 'LetterCase' conform to the 'Sendable' protocol
 8 | import Foundation
 9 |
10 | public enum LetterCase: String {
   |             `- note: consider making enum 'LetterCase' conform to the 'Sendable' protocol
11 |
12 |     public typealias Options = LetterCaseOptions
/Users/admin/builder/spi-builder-workspace/LetterCase/Classes/KeyDecodingStrategyAdditions.swift:65:86: warning: capture of 'newLetterCase' with non-sendable type 'LetterCase' in a '@Sendable' closure
 63 |                 return lastKey
 64 |             }
 65 |             let newLetterCaseKey = lastKey.stringValue.convert(from: letterCase, to: newLetterCase)
    |                                                                                      `- warning: capture of 'newLetterCase' with non-sendable type 'LetterCase' in a '@Sendable' closure
 66 |             return AnyKey(string: newLetterCaseKey)
 67 |         }
/Users/admin/builder/spi-builder-workspace/LetterCase/Classes/LetterCase.swift:10:13: note: consider making enum 'LetterCase' conform to the 'Sendable' protocol
 8 | import Foundation
 9 |
10 | public enum LetterCase: String {
   |             `- note: consider making enum 'LetterCase' conform to the 'Sendable' protocol
11 |
12 |     public typealias Options = LetterCaseOptions
/Users/admin/builder/spi-builder-workspace/LetterCase/Classes/KeyDecodingStrategyAdditions.swift:107:70: warning: capture of 'letterCase' with non-sendable type 'LetterCase' in a '@Sendable' closure
105 |                 return lastKey
106 |             }
107 |             let newLetterCaseKey = lastKey.stringValue.convert(from: letterCase, to: newLetterCase)
    |                                                                      `- warning: capture of 'letterCase' with non-sendable type 'LetterCase' in a '@Sendable' closure
108 |             return AnyKey(string: newLetterCaseKey)
109 |         }
/Users/admin/builder/spi-builder-workspace/LetterCase/Classes/LetterCase.swift:10:13: note: consider making enum 'LetterCase' conform to the 'Sendable' protocol
 8 | import Foundation
 9 |
10 | public enum LetterCase: String {
   |             `- note: consider making enum 'LetterCase' conform to the 'Sendable' protocol
11 |
12 |     public typealias Options = LetterCaseOptions
/Users/admin/builder/spi-builder-workspace/LetterCase/Classes/KeyDecodingStrategyAdditions.swift:107:86: warning: capture of 'newLetterCase' with non-sendable type 'LetterCase' in a '@Sendable' closure
105 |                 return lastKey
106 |             }
107 |             let newLetterCaseKey = lastKey.stringValue.convert(from: letterCase, to: newLetterCase)
    |                                                                                      `- warning: capture of 'newLetterCase' with non-sendable type 'LetterCase' in a '@Sendable' closure
108 |             return AnyKey(string: newLetterCaseKey)
109 |         }
/Users/admin/builder/spi-builder-workspace/LetterCase/Classes/LetterCase.swift:10:13: note: consider making enum 'LetterCase' conform to the 'Sendable' protocol
 8 | import Foundation
 9 |
10 | public enum LetterCase: String {
   |             `- note: consider making enum 'LetterCase' conform to the 'Sendable' protocol
11 |
12 |     public typealias Options = LetterCaseOptions
[5/7] Compiling LetterCase LetterCaseOptions.swift
/Users/admin/builder/spi-builder-workspace/LetterCase/Classes/LetterCaseOptions.swift:13:23: warning: static property 'preserveSuffix' is not concurrency-safe because non-'Sendable' type 'LetterCaseOptions' may have shared mutable state; this is an error in the Swift 6 language mode
 8 | import Foundation
 9 |
10 | public struct LetterCaseOptions: OptionSet {
   |               `- note: consider making struct 'LetterCaseOptions' conform to the 'Sendable' protocol
11 |     public let rawValue: Int
12 |
13 |     public static let preserveSuffix       = LetterCaseOptions(rawValue: 1 << 0)
   |                       |- warning: static property 'preserveSuffix' is not concurrency-safe because non-'Sendable' type 'LetterCaseOptions' may have shared mutable state; this is an error in the Swift 6 language mode
   |                       |- note: add '@MainActor' to make static property 'preserveSuffix' part of global actor 'MainActor'
   |                       `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
14 |     public static let preservePunctuation  = LetterCaseOptions(rawValue: 1 << 1)
15 |     public static let stripPunctuation     = LetterCaseOptions(rawValue: 1 << 2)
/Users/admin/builder/spi-builder-workspace/LetterCase/Classes/LetterCaseOptions.swift:14:23: warning: static property 'preservePunctuation' is not concurrency-safe because non-'Sendable' type 'LetterCaseOptions' may have shared mutable state; this is an error in the Swift 6 language mode
 8 | import Foundation
 9 |
10 | public struct LetterCaseOptions: OptionSet {
   |               `- note: consider making struct 'LetterCaseOptions' conform to the 'Sendable' protocol
11 |     public let rawValue: Int
12 |
13 |     public static let preserveSuffix       = LetterCaseOptions(rawValue: 1 << 0)
14 |     public static let preservePunctuation  = LetterCaseOptions(rawValue: 1 << 1)
   |                       |- warning: static property 'preservePunctuation' is not concurrency-safe because non-'Sendable' type 'LetterCaseOptions' may have shared mutable state; this is an error in the Swift 6 language mode
   |                       |- note: add '@MainActor' to make static property 'preservePunctuation' part of global actor 'MainActor'
   |                       `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
15 |     public static let stripPunctuation     = LetterCaseOptions(rawValue: 1 << 2)
16 |
/Users/admin/builder/spi-builder-workspace/LetterCase/Classes/LetterCaseOptions.swift:15:23: warning: static property 'stripPunctuation' is not concurrency-safe because non-'Sendable' type 'LetterCaseOptions' may have shared mutable state; this is an error in the Swift 6 language mode
 8 | import Foundation
 9 |
10 | public struct LetterCaseOptions: OptionSet {
   |               `- note: consider making struct 'LetterCaseOptions' conform to the 'Sendable' protocol
11 |     public let rawValue: Int
12 |
13 |     public static let preserveSuffix       = LetterCaseOptions(rawValue: 1 << 0)
14 |     public static let preservePunctuation  = LetterCaseOptions(rawValue: 1 << 1)
15 |     public static let stripPunctuation     = LetterCaseOptions(rawValue: 1 << 2)
   |                       |- warning: static property 'stripPunctuation' is not concurrency-safe because non-'Sendable' type 'LetterCaseOptions' may have shared mutable state; this is an error in the Swift 6 language mode
   |                       |- note: add '@MainActor' to make static property 'stripPunctuation' part of global actor 'MainActor'
   |                       `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
16 |
17 |     public init(rawValue: Int) {
[6/7] Emitting module LetterCase
/Users/admin/builder/spi-builder-workspace/LetterCase/Classes/LetterCaseOptions.swift:13:23: warning: static property 'preserveSuffix' is not concurrency-safe because non-'Sendable' type 'LetterCaseOptions' may have shared mutable state; this is an error in the Swift 6 language mode
 8 | import Foundation
 9 |
10 | public struct LetterCaseOptions: OptionSet {
   |               `- note: consider making struct 'LetterCaseOptions' conform to the 'Sendable' protocol
11 |     public let rawValue: Int
12 |
13 |     public static let preserveSuffix       = LetterCaseOptions(rawValue: 1 << 0)
   |                       |- warning: static property 'preserveSuffix' is not concurrency-safe because non-'Sendable' type 'LetterCaseOptions' may have shared mutable state; this is an error in the Swift 6 language mode
   |                       |- note: add '@MainActor' to make static property 'preserveSuffix' part of global actor 'MainActor'
   |                       `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
14 |     public static let preservePunctuation  = LetterCaseOptions(rawValue: 1 << 1)
15 |     public static let stripPunctuation     = LetterCaseOptions(rawValue: 1 << 2)
/Users/admin/builder/spi-builder-workspace/LetterCase/Classes/LetterCaseOptions.swift:14:23: warning: static property 'preservePunctuation' is not concurrency-safe because non-'Sendable' type 'LetterCaseOptions' may have shared mutable state; this is an error in the Swift 6 language mode
 8 | import Foundation
 9 |
10 | public struct LetterCaseOptions: OptionSet {
   |               `- note: consider making struct 'LetterCaseOptions' conform to the 'Sendable' protocol
11 |     public let rawValue: Int
12 |
13 |     public static let preserveSuffix       = LetterCaseOptions(rawValue: 1 << 0)
14 |     public static let preservePunctuation  = LetterCaseOptions(rawValue: 1 << 1)
   |                       |- warning: static property 'preservePunctuation' is not concurrency-safe because non-'Sendable' type 'LetterCaseOptions' may have shared mutable state; this is an error in the Swift 6 language mode
   |                       |- note: add '@MainActor' to make static property 'preservePunctuation' part of global actor 'MainActor'
   |                       `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
15 |     public static let stripPunctuation     = LetterCaseOptions(rawValue: 1 << 2)
16 |
/Users/admin/builder/spi-builder-workspace/LetterCase/Classes/LetterCaseOptions.swift:15:23: warning: static property 'stripPunctuation' is not concurrency-safe because non-'Sendable' type 'LetterCaseOptions' may have shared mutable state; this is an error in the Swift 6 language mode
 8 | import Foundation
 9 |
10 | public struct LetterCaseOptions: OptionSet {
   |               `- note: consider making struct 'LetterCaseOptions' conform to the 'Sendable' protocol
11 |     public let rawValue: Int
12 |
13 |     public static let preserveSuffix       = LetterCaseOptions(rawValue: 1 << 0)
14 |     public static let preservePunctuation  = LetterCaseOptions(rawValue: 1 << 1)
15 |     public static let stripPunctuation     = LetterCaseOptions(rawValue: 1 << 2)
   |                       |- warning: static property 'stripPunctuation' is not concurrency-safe because non-'Sendable' type 'LetterCaseOptions' may have shared mutable state; this is an error in the Swift 6 language mode
   |                       |- note: add '@MainActor' to make static property 'stripPunctuation' part of global actor 'MainActor'
   |                       `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
16 |
17 |     public init(rawValue: Int) {
[7/7] Compiling LetterCase StringAdditions.swift
Build complete! (4.17s)
Build complete.
{
  "dependencies" : [
  ],
  "manifest_display_name" : "LetterCase",
  "name" : "LetterCase",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "LetterCase",
      "targets" : [
        "LetterCase"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "LetterCase",
      "module_type" : "SwiftTarget",
      "name" : "LetterCase",
      "path" : "LetterCase/Classes",
      "product_memberships" : [
        "LetterCase"
      ],
      "sources" : [
        "KeyDecodingStrategyAdditions.swift",
        "LetterCase.swift",
        "LetterCaseOptions.swift",
        "StringAdditions.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "4.2"
}
Done.