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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 RuleKit, reference master (2d7215), with Swift 6.1 for macOS (SPM) on 25 Apr 2025 04:37:20 UTC.

Swift 6 data race errors: 2

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/apparata/rulekit.git
Reference: master
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/apparata/rulekit
 * branch            master     -> FETCH_HEAD
 * [new branch]      master     -> origin/master
HEAD is now at 2d72159 Update Package.swift
Cloned https://github.com/apparata/rulekit.git
Revision (git rev-parse @):
2d7215959d214dd5fadc3ae19167bef5482eaa84
SUCCESS checkout https://github.com/apparata/rulekit.git at master
========================================
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": "rulekit",
      "name": "RuleKit",
      "url": "https://github.com/apparata/rulekit.git",
      "version": "unspecified",
      "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/rulekit",
      "dependencies": [
      ]
    }
  ]
}
Fetching https://github.com/apparata/rulekit.git
[1/45] Fetching rulekit
Fetched https://github.com/apparata/rulekit.git from cache (0.65s)
Creating working copy for https://github.com/apparata/rulekit.git
Working copy of https://github.com/apparata/rulekit.git resolved at master (2d72159)
warning: '.resolve-product-dependencies': dependency 'rulekit' 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/apparata/rulekit.git
https://github.com/apparata/rulekit.git
{
  "dependencies" : [
  ],
  "manifest_display_name" : "RuleKit",
  "name" : "RuleKit",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
    {
      "name" : "macos",
      "version" : "10.14"
    },
    {
      "name" : "ios",
      "version" : "12.0"
    },
    {
      "name" : "tvos",
      "version" : "12.0"
    }
  ],
  "products" : [
    {
      "name" : "RuleKit",
      "targets" : [
        "RuleKit"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "RuleKitTests",
      "module_type" : "SwiftTarget",
      "name" : "RuleKitTests",
      "path" : "Tests/RuleKitTests",
      "sources" : [
        "RuleKitTests.swift",
        "XCTestManifests.swift"
      ],
      "target_dependencies" : [
        "RuleKit"
      ],
      "type" : "test"
    },
    {
      "c99name" : "RuleKit",
      "module_type" : "SwiftTarget",
      "name" : "RuleKit",
      "path" : "Sources/RuleKit",
      "product_memberships" : [
        "RuleKit"
      ],
      "sources" : [
        "Collection Extensions/Collection+Satisfies.swift",
        "Generic Rules/Composite Rules/SatisfyAllRules.swift",
        "Generic Rules/Composite Rules/SatisfyAnyRules.swift",
        "Generic Rules/Composite Rules/SatisfyAtLeastRules.swift",
        "Generic Rules/Composite Rules/SatisfyAtMostRules.swift",
        "Generic Rules/Composite Rules/SatisfyBothRule.swift",
        "Generic Rules/Composite Rules/SatisfyEitherRule.swift",
        "Generic Rules/Composite Rules/SatisfyExactlyOneRule.swift",
        "Generic Rules/Composite Rules/SatisfyExactlyRules.swift",
        "Generic Rules/Composite Rules/SatisfyLessThanRules.swift",
        "Generic Rules/Composite Rules/SatisfyMoreThanRules.swift",
        "Generic Rules/Composite Rules/SatisfyNoRule.swift",
        "Generic Rules/Composite Rules/SatisfyNotRule.swift",
        "Generic Rules/Rule.swift",
        "Generic Rules/Value Rules/SatisfyAtLeast.swift",
        "Generic Rules/Value Rules/SatisfyAtMost.swift",
        "Generic Rules/Value Rules/SatisfyEquals.swift",
        "Generic Rules/Value Rules/SatisfyIdentical.swift",
        "Generic Rules/Value Rules/SatisfyLessThan.swift",
        "Generic Rules/Value Rules/SatisfyMoreThan.swift",
        "Type Specific Rules/Int+Rules.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.1"
}
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
[3/22] Compiling RuleKit SatisfyLessThanRules.swift
[4/22] Compiling RuleKit SatisfyMoreThanRules.swift
[5/22] Compiling RuleKit SatisfyIdentical.swift
[6/22] Compiling RuleKit SatisfyLessThan.swift
[7/24] Compiling RuleKit SatisfyAtMost.swift
[8/24] Compiling RuleKit SatisfyEquals.swift
[9/24] Compiling RuleKit SatisfyBothRule.swift
[10/24] Compiling RuleKit SatisfyEitherRule.swift
[11/24] Compiling RuleKit SatisfyExactlyOneRule.swift
[12/24] Compiling RuleKit SatisfyExactlyRules.swift
[13/24] Compiling RuleKit Rule.swift
[14/24] Compiling RuleKit SatisfyAtLeast.swift
[15/24] Emitting module RuleKit
/Users/admin/builder/spi-builder-workspace/Sources/RuleKit/Type Specific Rules/Int+Rules.swift:20:16: warning: static property 'even' is not concurrency-safe because non-'Sendable' type 'Rule<Int>' may have shared mutable state; this is an error in the Swift 6 language mode
18 | public extension Rule where Value == Int {
19 |
20 |     static let even: Rule = IsEvenIntRule()
   |                |- warning: static property 'even' is not concurrency-safe because non-'Sendable' type 'Rule<Int>' may have shared mutable state; this is an error in the Swift 6 language mode
   |                |- note: add '@MainActor' to make static property 'even' part of global actor 'MainActor'
   |                `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
21 |     static let odd: Rule = .not(.even)
22 | }
/Users/admin/builder/spi-builder-workspace/Sources/RuleKit/Generic Rules/Rule.swift:7:14: note: generic class 'Rule' does not conform to the 'Sendable' protocol
 5 | import Foundation
 6 |
 7 | public class Rule<Value> {
   |              `- note: generic class 'Rule' does not conform to the 'Sendable' protocol
 8 |
 9 |     public init() {}
/Users/admin/builder/spi-builder-workspace/Sources/RuleKit/Type Specific Rules/Int+Rules.swift:21:16: warning: static property 'odd' is not concurrency-safe because non-'Sendable' type 'Rule<Int>' may have shared mutable state; this is an error in the Swift 6 language mode
19 |
20 |     static let even: Rule = IsEvenIntRule()
21 |     static let odd: Rule = .not(.even)
   |                |- warning: static property 'odd' is not concurrency-safe because non-'Sendable' type 'Rule<Int>' may have shared mutable state; this is an error in the Swift 6 language mode
   |                |- note: add '@MainActor' to make static property 'odd' part of global actor 'MainActor'
   |                `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
22 | }
23 |
/Users/admin/builder/spi-builder-workspace/Sources/RuleKit/Generic Rules/Rule.swift:7:14: note: generic class 'Rule' does not conform to the 'Sendable' protocol
 5 | import Foundation
 6 |
 7 | public class Rule<Value> {
   |              `- note: generic class 'Rule' does not conform to the 'Sendable' protocol
 8 |
 9 |     public init() {}
[16/24] Compiling RuleKit SatisfyNoRule.swift
[17/24] Compiling RuleKit SatisfyNotRule.swift
[18/24] Compiling RuleKit SatisfyAtLeastRules.swift
[19/24] Compiling RuleKit SatisfyAtMostRules.swift
[20/24] Compiling RuleKit Collection+Satisfies.swift
[21/24] Compiling RuleKit SatisfyAllRules.swift
[22/24] Compiling RuleKit SatisfyAnyRules.swift
[23/24] Compiling RuleKit SatisfyMoreThan.swift
/Users/admin/builder/spi-builder-workspace/Sources/RuleKit/Type Specific Rules/Int+Rules.swift:20:16: warning: static property 'even' is not concurrency-safe because non-'Sendable' type 'Rule<Int>' may have shared mutable state; this is an error in the Swift 6 language mode
18 | public extension Rule where Value == Int {
19 |
20 |     static let even: Rule = IsEvenIntRule()
   |                |- warning: static property 'even' is not concurrency-safe because non-'Sendable' type 'Rule<Int>' may have shared mutable state; this is an error in the Swift 6 language mode
   |                |- note: add '@MainActor' to make static property 'even' part of global actor 'MainActor'
   |                `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
21 |     static let odd: Rule = .not(.even)
22 | }
/Users/admin/builder/spi-builder-workspace/Sources/RuleKit/Generic Rules/Rule.swift:7:14: note: generic class 'Rule' does not conform to the 'Sendable' protocol
 5 | import Foundation
 6 |
 7 | public class Rule<Value> {
   |              `- note: generic class 'Rule' does not conform to the 'Sendable' protocol
 8 |
 9 |     public init() {}
/Users/admin/builder/spi-builder-workspace/Sources/RuleKit/Type Specific Rules/Int+Rules.swift:21:16: warning: static property 'odd' is not concurrency-safe because non-'Sendable' type 'Rule<Int>' may have shared mutable state; this is an error in the Swift 6 language mode
19 |
20 |     static let even: Rule = IsEvenIntRule()
21 |     static let odd: Rule = .not(.even)
   |                |- warning: static property 'odd' is not concurrency-safe because non-'Sendable' type 'Rule<Int>' may have shared mutable state; this is an error in the Swift 6 language mode
   |                |- note: add '@MainActor' to make static property 'odd' part of global actor 'MainActor'
   |                `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
22 | }
23 |
/Users/admin/builder/spi-builder-workspace/Sources/RuleKit/Generic Rules/Rule.swift:7:14: note: generic class 'Rule' does not conform to the 'Sendable' protocol
 5 | import Foundation
 6 |
 7 | public class Rule<Value> {
   |              `- note: generic class 'Rule' does not conform to the 'Sendable' protocol
 8 |
 9 |     public init() {}
[24/24] Compiling RuleKit Int+Rules.swift
/Users/admin/builder/spi-builder-workspace/Sources/RuleKit/Type Specific Rules/Int+Rules.swift:20:16: warning: static property 'even' is not concurrency-safe because non-'Sendable' type 'Rule<Int>' may have shared mutable state; this is an error in the Swift 6 language mode
18 | public extension Rule where Value == Int {
19 |
20 |     static let even: Rule = IsEvenIntRule()
   |                |- warning: static property 'even' is not concurrency-safe because non-'Sendable' type 'Rule<Int>' may have shared mutable state; this is an error in the Swift 6 language mode
   |                |- note: add '@MainActor' to make static property 'even' part of global actor 'MainActor'
   |                `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
21 |     static let odd: Rule = .not(.even)
22 | }
/Users/admin/builder/spi-builder-workspace/Sources/RuleKit/Generic Rules/Rule.swift:7:14: note: generic class 'Rule' does not conform to the 'Sendable' protocol
 5 | import Foundation
 6 |
 7 | public class Rule<Value> {
   |              `- note: generic class 'Rule' does not conform to the 'Sendable' protocol
 8 |
 9 |     public init() {}
/Users/admin/builder/spi-builder-workspace/Sources/RuleKit/Type Specific Rules/Int+Rules.swift:21:16: warning: static property 'odd' is not concurrency-safe because non-'Sendable' type 'Rule<Int>' may have shared mutable state; this is an error in the Swift 6 language mode
19 |
20 |     static let even: Rule = IsEvenIntRule()
21 |     static let odd: Rule = .not(.even)
   |                |- warning: static property 'odd' is not concurrency-safe because non-'Sendable' type 'Rule<Int>' may have shared mutable state; this is an error in the Swift 6 language mode
   |                |- note: add '@MainActor' to make static property 'odd' part of global actor 'MainActor'
   |                `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
22 | }
23 |
/Users/admin/builder/spi-builder-workspace/Sources/RuleKit/Generic Rules/Rule.swift:7:14: note: generic class 'Rule' does not conform to the 'Sendable' protocol
 5 | import Foundation
 6 |
 7 | public class Rule<Value> {
   |              `- note: generic class 'Rule' does not conform to the 'Sendable' protocol
 8 |
 9 |     public init() {}
Build complete! (6.49s)
Build complete.
{
  "dependencies" : [
  ],
  "manifest_display_name" : "RuleKit",
  "name" : "RuleKit",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
    {
      "name" : "macos",
      "version" : "10.14"
    },
    {
      "name" : "ios",
      "version" : "12.0"
    },
    {
      "name" : "tvos",
      "version" : "12.0"
    }
  ],
  "products" : [
    {
      "name" : "RuleKit",
      "targets" : [
        "RuleKit"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "RuleKitTests",
      "module_type" : "SwiftTarget",
      "name" : "RuleKitTests",
      "path" : "Tests/RuleKitTests",
      "sources" : [
        "RuleKitTests.swift",
        "XCTestManifests.swift"
      ],
      "target_dependencies" : [
        "RuleKit"
      ],
      "type" : "test"
    },
    {
      "c99name" : "RuleKit",
      "module_type" : "SwiftTarget",
      "name" : "RuleKit",
      "path" : "Sources/RuleKit",
      "product_memberships" : [
        "RuleKit"
      ],
      "sources" : [
        "Collection Extensions/Collection+Satisfies.swift",
        "Generic Rules/Composite Rules/SatisfyAllRules.swift",
        "Generic Rules/Composite Rules/SatisfyAnyRules.swift",
        "Generic Rules/Composite Rules/SatisfyAtLeastRules.swift",
        "Generic Rules/Composite Rules/SatisfyAtMostRules.swift",
        "Generic Rules/Composite Rules/SatisfyBothRule.swift",
        "Generic Rules/Composite Rules/SatisfyEitherRule.swift",
        "Generic Rules/Composite Rules/SatisfyExactlyOneRule.swift",
        "Generic Rules/Composite Rules/SatisfyExactlyRules.swift",
        "Generic Rules/Composite Rules/SatisfyLessThanRules.swift",
        "Generic Rules/Composite Rules/SatisfyMoreThanRules.swift",
        "Generic Rules/Composite Rules/SatisfyNoRule.swift",
        "Generic Rules/Composite Rules/SatisfyNotRule.swift",
        "Generic Rules/Rule.swift",
        "Generic Rules/Value Rules/SatisfyAtLeast.swift",
        "Generic Rules/Value Rules/SatisfyAtMost.swift",
        "Generic Rules/Value Rules/SatisfyEquals.swift",
        "Generic Rules/Value Rules/SatisfyIdentical.swift",
        "Generic Rules/Value Rules/SatisfyLessThan.swift",
        "Generic Rules/Value Rules/SatisfyMoreThan.swift",
        "Type Specific Rules/Int+Rules.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.1"
}
Done.