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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 LogicKit, reference 2.1.0 (3e3245), with Swift 6.1 for macOS (SPM) on 26 Apr 2025 14:15:23 UTC.

Swift 6 data race errors: 9

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/kyouko-taiga/logickit.git
Reference: 2.1.0
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/kyouko-taiga/logickit
 * tag               2.1.0      -> FETCH_HEAD
HEAD is now at 3e32454 Update Swift's version in CI configuration
Cloned https://github.com/kyouko-taiga/logickit.git
Revision (git rev-parse @):
3e32454479684da7f37f8fe31c73724735b71d04
SUCCESS checkout https://github.com/kyouko-taiga/logickit.git at 2.1.0
========================================
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": "logickit",
      "name": "LogicKit",
      "url": "https://github.com/kyouko-taiga/logickit.git",
      "version": "unspecified",
      "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/logickit",
      "dependencies": [
      ]
    }
  ]
}
Fetching https://github.com/kyouko-taiga/logickit.git
[11/515] Fetching logickit
Fetched https://github.com/kyouko-taiga/logickit.git from cache (0.70s)
Creating working copy for https://github.com/kyouko-taiga/logickit.git
Working copy of https://github.com/kyouko-taiga/logickit.git resolved at 2.1.0 (3e32454)
warning: '.resolve-product-dependencies': dependency 'logickit' 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/kyouko-taiga/logickit.git
https://github.com/kyouko-taiga/logickit.git
{
  "dependencies" : [
  ],
  "manifest_display_name" : "LogicKit",
  "name" : "LogicKit",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "LogicKit",
      "targets" : [
        "LogicKit",
        "LogicKitBuiltins"
      ],
      "type" : {
        "library" : [
          "static"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "LogicKitTests",
      "module_type" : "SwiftTarget",
      "name" : "LogicKitTests",
      "path" : "Tests/LogicKitTests",
      "sources" : [
        "BindingMapTests.swift",
        "KnowledgeBaseTests.swift",
        "LogicKitTests.swift",
        "XCTestManifests.swift"
      ],
      "target_dependencies" : [
        "LogicKit"
      ],
      "type" : "test"
    },
    {
      "c99name" : "LogicKitBuiltinsTests",
      "module_type" : "SwiftTarget",
      "name" : "LogicKitBuiltinsTests",
      "path" : "Tests/LogicKitBuiltinsTests",
      "sources" : [
        "ListTests.swift",
        "NatTests.swift"
      ],
      "target_dependencies" : [
        "LogicKitBuiltins"
      ],
      "type" : "test"
    },
    {
      "c99name" : "LogicKitBuiltins",
      "module_type" : "SwiftTarget",
      "name" : "LogicKitBuiltins",
      "path" : "Sources/LogicKitBuiltins",
      "product_memberships" : [
        "LogicKit"
      ],
      "sources" : [
        "List.swift",
        "Nat.swift"
      ],
      "target_dependencies" : [
        "LogicKit"
      ],
      "type" : "library"
    },
    {
      "c99name" : "LogicKit",
      "module_type" : "SwiftTarget",
      "name" : "LogicKit",
      "path" : "Sources/LogicKit",
      "product_memberships" : [
        "LogicKit"
      ],
      "sources" : [
        "AnswerSet.swift",
        "BindingMap.swift",
        "EDSL.swift",
        "KnowledgeBase.swift",
        "Logger.swift",
        "Realizer.swift",
        "Sequence+Extensions.swift",
        "Term.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...
[0/5] Write sources
[2/5] Write swift-version-2F0A5646E1D333AE.txt
[4/14] Compiling LogicKit Sequence+Extensions.swift
[5/14] Compiling LogicKit Term.swift
[6/14] Compiling LogicKit Logger.swift
/Users/admin/builder/spi-builder-workspace/Sources/LogicKit/Logger.swift:78:14: warning: static property 'foreground' is not concurrency-safe because non-'Sendable' type '[FontColor : String]' may have shared mutable state; this is an error in the Swift 6 language mode
 1 | public enum FontColor {
   |             `- note: consider making enum 'FontColor' conform to the 'Sendable' protocol
 2 |
 3 |   case red, green, yellow
   :
76 |   }
77 |
78 |   static let foreground: [FontColor: String] = [
   |              |- warning: static property 'foreground' is not concurrency-safe because non-'Sendable' type '[FontColor : String]' may have shared mutable state; this is an error in the Swift 6 language mode
   |              |- note: add '@MainActor' to make static property 'foreground' part of global actor 'MainActor'
   |              `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
79 |     .red   : "31m",
80 |     .green : "32m",
/Users/admin/builder/spi-builder-workspace/Sources/LogicKit/Logger.swift:84:14: warning: static property 'background' is not concurrency-safe because non-'Sendable' type '[FontColor : String]' may have shared mutable state; this is an error in the Swift 6 language mode
 1 | public enum FontColor {
   |             `- note: consider making enum 'FontColor' conform to the 'Sendable' protocol
 2 |
 3 |   case red, green, yellow
   :
82 |   ]
83 |
84 |   static let background: [FontColor: String] = [
   |              |- warning: static property 'background' is not concurrency-safe because non-'Sendable' type '[FontColor : String]' may have shared mutable state; this is an error in the Swift 6 language mode
   |              |- note: add '@MainActor' to make static property 'background' part of global actor 'MainActor'
   |              `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
85 |     .red   : "41m",
86 |     .green : "42m",
[7/14] Compiling LogicKit Realizer.swift
[8/14] Compiling LogicKit EDSL.swift
[9/14] Compiling LogicKit AnswerSet.swift
[10/14] Compiling LogicKit BindingMap.swift
[11/14] Compiling LogicKit KnowledgeBase.swift
[12/14] Emitting module LogicKit
/Users/admin/builder/spi-builder-workspace/Sources/LogicKit/Logger.swift:78:14: warning: static property 'foreground' is not concurrency-safe because non-'Sendable' type '[FontColor : String]' may have shared mutable state; this is an error in the Swift 6 language mode
 1 | public enum FontColor {
   |             `- note: consider making enum 'FontColor' conform to the 'Sendable' protocol
 2 |
 3 |   case red, green, yellow
   :
76 |   }
77 |
78 |   static let foreground: [FontColor: String] = [
   |              |- warning: static property 'foreground' is not concurrency-safe because non-'Sendable' type '[FontColor : String]' may have shared mutable state; this is an error in the Swift 6 language mode
   |              |- note: add '@MainActor' to make static property 'foreground' part of global actor 'MainActor'
   |              `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
79 |     .red   : "31m",
80 |     .green : "32m",
/Users/admin/builder/spi-builder-workspace/Sources/LogicKit/Logger.swift:84:14: warning: static property 'background' is not concurrency-safe because non-'Sendable' type '[FontColor : String]' may have shared mutable state; this is an error in the Swift 6 language mode
 1 | public enum FontColor {
   |             `- note: consider making enum 'FontColor' conform to the 'Sendable' protocol
 2 |
 3 |   case red, green, yellow
   :
82 |   ]
83 |
84 |   static let background: [FontColor: String] = [
   |              |- warning: static property 'background' is not concurrency-safe because non-'Sendable' type '[FontColor : String]' may have shared mutable state; this is an error in the Swift 6 language mode
   |              |- note: add '@MainActor' to make static property 'background' part of global actor 'MainActor'
   |              `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
85 |     .red   : "41m",
86 |     .green : "42m",
[13/17] Emitting module LogicKitBuiltins
/Users/admin/builder/spi-builder-workspace/Sources/LogicKitBuiltins/List.swift:7:21: warning: static property 'empty' is not concurrency-safe because non-'Sendable' type 'Term' may have shared mutable state; this is an error in the Swift 6 language mode
  5 |   // MARK: Generators
  6 |
  7 |   public static let empty: Term = .lit("list::empty")
    |                     `- warning: static property 'empty' is not concurrency-safe because non-'Sendable' type 'Term' may have shared mutable state; this is an error in the Swift 6 language mode
  8 |
  9 |   public static func cons(_ head: Term, _ tail: Term) -> Term {
/Users/admin/builder/spi-builder-workspace/Sources/LogicKit/Term.swift:1:13: note: enum 'Term' does not conform to the 'Sendable' protocol
  1 | public enum Term {
    |             `- note: enum 'Term' does not conform to the 'Sendable' protocol
  2 |
  3 |   /// A logic variable.
/Users/admin/builder/spi-builder-workspace/Sources/LogicKitBuiltins/List.swift:1:1: warning: add '@preconcurrency' to suppress 'Sendable'-related warnings from module 'LogicKit'
  1 | import LogicKit
    | `- warning: add '@preconcurrency' to suppress 'Sendable'-related warnings from module 'LogicKit'
  2 |
  3 | public enum List {
    :
  5 |   // MARK: Generators
  6 |
  7 |   public static let empty: Term = .lit("list::empty")
    |                     |- note: add '@MainActor' to make static property 'empty' part of global actor 'MainActor'
    |                     `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
  8 |
  9 |   public static func cons(_ head: Term, _ tail: Term) -> Term {
/Users/admin/builder/spi-builder-workspace/Sources/LogicKitBuiltins/List.swift:41:21: warning: static property 'countAxioms' is not concurrency-safe because non-'Sendable' type '[Term]' may have shared mutable state; this is an error in the Swift 6 language mode
 39 |   public static var axioms: [Term] { return countAxioms + containsAxioms + concatAxioms }
 40 |
 41 |   public static let countAxioms: [Term] = {
    |                     |- warning: static property 'countAxioms' is not concurrency-safe because non-'Sendable' type '[Term]' may have shared mutable state; this is an error in the Swift 6 language mode
    |                     |- note: add '@MainActor' to make static property 'countAxioms' part of global actor 'MainActor'
    |                     `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 42 |     let a: Term = .var("a")
 43 |     let b: Term = .var("b")
/Users/admin/builder/spi-builder-workspace/Sources/LogicKit/Term.swift:1:13: note: enum 'Term' does not conform to the 'Sendable' protocol
  1 | public enum Term {
    |             `- note: enum 'Term' does not conform to the 'Sendable' protocol
  2 |
  3 |   /// A logic variable.
/Users/admin/builder/spi-builder-workspace/Sources/LogicKitBuiltins/List.swift:54:21: warning: static property 'containsAxioms' is not concurrency-safe because non-'Sendable' type '[Term]' may have shared mutable state; this is an error in the Swift 6 language mode
 52 |   }()
 53 |
 54 |   public static let containsAxioms: [Term] = {
    |                     |- warning: static property 'containsAxioms' is not concurrency-safe because non-'Sendable' type '[Term]' may have shared mutable state; this is an error in the Swift 6 language mode
    |                     |- note: add '@MainActor' to make static property 'containsAxioms' part of global actor 'MainActor'
    |                     `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 55 |     let a: Term = .var("a")
 56 |     let b: Term = .var("b")
/Users/admin/builder/spi-builder-workspace/Sources/LogicKit/Term.swift:1:13: note: enum 'Term' does not conform to the 'Sendable' protocol
  1 | public enum Term {
    |             `- note: enum 'Term' does not conform to the 'Sendable' protocol
  2 |
  3 |   /// A logic variable.
/Users/admin/builder/spi-builder-workspace/Sources/LogicKitBuiltins/List.swift:67:21: warning: static property 'concatAxioms' is not concurrency-safe because non-'Sendable' type '[Term]' may have shared mutable state; this is an error in the Swift 6 language mode
 65 |   }()
 66 |
 67 |   public static let concatAxioms: [Term] = {
    |                     |- warning: static property 'concatAxioms' is not concurrency-safe because non-'Sendable' type '[Term]' may have shared mutable state; this is an error in the Swift 6 language mode
    |                     |- note: add '@MainActor' to make static property 'concatAxioms' part of global actor 'MainActor'
    |                     `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 68 |     let a: Term = .var("a")
 69 |     let b: Term = .var("b")
/Users/admin/builder/spi-builder-workspace/Sources/LogicKit/Term.swift:1:13: note: enum 'Term' does not conform to the 'Sendable' protocol
  1 | public enum Term {
    |             `- note: enum 'Term' does not conform to the 'Sendable' protocol
  2 |
  3 |   /// A logic variable.
/Users/admin/builder/spi-builder-workspace/Sources/LogicKitBuiltins/Nat.swift:7:21: warning: static property 'zero' is not concurrency-safe because non-'Sendable' type 'Term' may have shared mutable state; this is an error in the Swift 6 language mode
  5 |   // MARK: Generators
  6 |
  7 |   public static let zero: Term = .lit("nat::0")
    |                     `- warning: static property 'zero' is not concurrency-safe because non-'Sendable' type 'Term' may have shared mutable state; this is an error in the Swift 6 language mode
  8 |
  9 |   public static func succ(_ n: Term) -> Term {
/Users/admin/builder/spi-builder-workspace/Sources/LogicKit/Term.swift:1:13: note: enum 'Term' does not conform to the 'Sendable' protocol
  1 | public enum Term {
    |             `- note: enum 'Term' does not conform to the 'Sendable' protocol
  2 |
  3 |   /// A logic variable.
/Users/admin/builder/spi-builder-workspace/Sources/LogicKitBuiltins/Nat.swift:1:1: warning: add '@preconcurrency' to suppress 'Sendable'-related warnings from module 'LogicKit'
  1 | import LogicKit
    | `- warning: add '@preconcurrency' to suppress 'Sendable'-related warnings from module 'LogicKit'
  2 |
  3 | public enum Nat {
    :
  5 |   // MARK: Generators
  6 |
  7 |   public static let zero: Term = .lit("nat::0")
    |                     |- note: add '@MainActor' to make static property 'zero' part of global actor 'MainActor'
    |                     `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
  8 |
  9 |   public static func succ(_ n: Term) -> Term {
/Users/admin/builder/spi-builder-workspace/Sources/LogicKitBuiltins/Nat.swift:88:21: warning: static property 'relationAxioms' is not concurrency-safe because non-'Sendable' type '[Term]' may have shared mutable state; this is an error in the Swift 6 language mode
 86 |   public static var axioms: [Term] { return arithmeticAxioms }
 87 |
 88 |   public static let relationAxioms: [Term] = {
    |                     |- warning: static property 'relationAxioms' is not concurrency-safe because non-'Sendable' type '[Term]' may have shared mutable state; this is an error in the Swift 6 language mode
    |                     |- note: add '@MainActor' to make static property 'relationAxioms' part of global actor 'MainActor'
    |                     `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 89 |     let x: Term = .var("x")
 90 |     let y: Term = .var("y")
/Users/admin/builder/spi-builder-workspace/Sources/LogicKit/Term.swift:1:13: note: enum 'Term' does not conform to the 'Sendable' protocol
  1 | public enum Term {
    |             `- note: enum 'Term' does not conform to the 'Sendable' protocol
  2 |
  3 |   /// A logic variable.
/Users/admin/builder/spi-builder-workspace/Sources/LogicKitBuiltins/Nat.swift:115:21: warning: static property 'arithmeticAxioms' is not concurrency-safe because non-'Sendable' type '[Term]' may have shared mutable state; this is an error in the Swift 6 language mode
113 |   }()
114 |
115 |   public static let arithmeticAxioms: [Term] = {
    |                     |- warning: static property 'arithmeticAxioms' is not concurrency-safe because non-'Sendable' type '[Term]' may have shared mutable state; this is an error in the Swift 6 language mode
    |                     |- note: add '@MainActor' to make static property 'arithmeticAxioms' part of global actor 'MainActor'
    |                     `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
116 |     let v: Term = .var("v")
117 |     let w: Term = .var("w")
/Users/admin/builder/spi-builder-workspace/Sources/LogicKit/Term.swift:1:13: note: enum 'Term' does not conform to the 'Sendable' protocol
  1 | public enum Term {
    |             `- note: enum 'Term' does not conform to the 'Sendable' protocol
  2 |
  3 |   /// A logic variable.
[14/17] Compiling LogicKitBuiltins List.swift
/Users/admin/builder/spi-builder-workspace/Sources/LogicKitBuiltins/List.swift:7:21: warning: static property 'empty' is not concurrency-safe because non-'Sendable' type 'Term' may have shared mutable state; this is an error in the Swift 6 language mode
  5 |   // MARK: Generators
  6 |
  7 |   public static let empty: Term = .lit("list::empty")
    |                     `- warning: static property 'empty' is not concurrency-safe because non-'Sendable' type 'Term' may have shared mutable state; this is an error in the Swift 6 language mode
  8 |
  9 |   public static func cons(_ head: Term, _ tail: Term) -> Term {
/Users/admin/builder/spi-builder-workspace/Sources/LogicKit/Term.swift:1:13: note: enum 'Term' does not conform to the 'Sendable' protocol
  1 | public enum Term {
    |             `- note: enum 'Term' does not conform to the 'Sendable' protocol
  2 |
  3 |   /// A logic variable.
/Users/admin/builder/spi-builder-workspace/Sources/LogicKitBuiltins/List.swift:1:1: warning: add '@preconcurrency' to suppress 'Sendable'-related warnings from module 'LogicKit'
  1 | import LogicKit
    | `- warning: add '@preconcurrency' to suppress 'Sendable'-related warnings from module 'LogicKit'
  2 |
  3 | public enum List {
    :
  5 |   // MARK: Generators
  6 |
  7 |   public static let empty: Term = .lit("list::empty")
    |                     |- note: add '@MainActor' to make static property 'empty' part of global actor 'MainActor'
    |                     `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
  8 |
  9 |   public static func cons(_ head: Term, _ tail: Term) -> Term {
/Users/admin/builder/spi-builder-workspace/Sources/LogicKitBuiltins/List.swift:41:21: warning: static property 'countAxioms' is not concurrency-safe because non-'Sendable' type '[Term]' may have shared mutable state; this is an error in the Swift 6 language mode
 39 |   public static var axioms: [Term] { return countAxioms + containsAxioms + concatAxioms }
 40 |
 41 |   public static let countAxioms: [Term] = {
    |                     |- warning: static property 'countAxioms' is not concurrency-safe because non-'Sendable' type '[Term]' may have shared mutable state; this is an error in the Swift 6 language mode
    |                     |- note: add '@MainActor' to make static property 'countAxioms' part of global actor 'MainActor'
    |                     `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 42 |     let a: Term = .var("a")
 43 |     let b: Term = .var("b")
/Users/admin/builder/spi-builder-workspace/Sources/LogicKit/Term.swift:1:13: note: enum 'Term' does not conform to the 'Sendable' protocol
  1 | public enum Term {
    |             `- note: enum 'Term' does not conform to the 'Sendable' protocol
  2 |
  3 |   /// A logic variable.
/Users/admin/builder/spi-builder-workspace/Sources/LogicKitBuiltins/List.swift:54:21: warning: static property 'containsAxioms' is not concurrency-safe because non-'Sendable' type '[Term]' may have shared mutable state; this is an error in the Swift 6 language mode
 52 |   }()
 53 |
 54 |   public static let containsAxioms: [Term] = {
    |                     |- warning: static property 'containsAxioms' is not concurrency-safe because non-'Sendable' type '[Term]' may have shared mutable state; this is an error in the Swift 6 language mode
    |                     |- note: add '@MainActor' to make static property 'containsAxioms' part of global actor 'MainActor'
    |                     `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 55 |     let a: Term = .var("a")
 56 |     let b: Term = .var("b")
/Users/admin/builder/spi-builder-workspace/Sources/LogicKit/Term.swift:1:13: note: enum 'Term' does not conform to the 'Sendable' protocol
  1 | public enum Term {
    |             `- note: enum 'Term' does not conform to the 'Sendable' protocol
  2 |
  3 |   /// A logic variable.
/Users/admin/builder/spi-builder-workspace/Sources/LogicKitBuiltins/List.swift:67:21: warning: static property 'concatAxioms' is not concurrency-safe because non-'Sendable' type '[Term]' may have shared mutable state; this is an error in the Swift 6 language mode
 65 |   }()
 66 |
 67 |   public static let concatAxioms: [Term] = {
    |                     |- warning: static property 'concatAxioms' is not concurrency-safe because non-'Sendable' type '[Term]' may have shared mutable state; this is an error in the Swift 6 language mode
    |                     |- note: add '@MainActor' to make static property 'concatAxioms' part of global actor 'MainActor'
    |                     `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 68 |     let a: Term = .var("a")
 69 |     let b: Term = .var("b")
/Users/admin/builder/spi-builder-workspace/Sources/LogicKit/Term.swift:1:13: note: enum 'Term' does not conform to the 'Sendable' protocol
  1 | public enum Term {
    |             `- note: enum 'Term' does not conform to the 'Sendable' protocol
  2 |
  3 |   /// A logic variable.
[15/17] Compiling LogicKitBuiltins Nat.swift
/Users/admin/builder/spi-builder-workspace/Sources/LogicKitBuiltins/Nat.swift:7:21: warning: static property 'zero' is not concurrency-safe because non-'Sendable' type 'Term' may have shared mutable state; this is an error in the Swift 6 language mode
  5 |   // MARK: Generators
  6 |
  7 |   public static let zero: Term = .lit("nat::0")
    |                     `- warning: static property 'zero' is not concurrency-safe because non-'Sendable' type 'Term' may have shared mutable state; this is an error in the Swift 6 language mode
  8 |
  9 |   public static func succ(_ n: Term) -> Term {
/Users/admin/builder/spi-builder-workspace/Sources/LogicKit/Term.swift:1:13: note: enum 'Term' does not conform to the 'Sendable' protocol
  1 | public enum Term {
    |             `- note: enum 'Term' does not conform to the 'Sendable' protocol
  2 |
  3 |   /// A logic variable.
/Users/admin/builder/spi-builder-workspace/Sources/LogicKitBuiltins/Nat.swift:1:1: warning: add '@preconcurrency' to suppress 'Sendable'-related warnings from module 'LogicKit'
  1 | import LogicKit
    | `- warning: add '@preconcurrency' to suppress 'Sendable'-related warnings from module 'LogicKit'
  2 |
  3 | public enum Nat {
    :
  5 |   // MARK: Generators
  6 |
  7 |   public static let zero: Term = .lit("nat::0")
    |                     |- note: add '@MainActor' to make static property 'zero' part of global actor 'MainActor'
    |                     `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
  8 |
  9 |   public static func succ(_ n: Term) -> Term {
/Users/admin/builder/spi-builder-workspace/Sources/LogicKitBuiltins/Nat.swift:88:21: warning: static property 'relationAxioms' is not concurrency-safe because non-'Sendable' type '[Term]' may have shared mutable state; this is an error in the Swift 6 language mode
 86 |   public static var axioms: [Term] { return arithmeticAxioms }
 87 |
 88 |   public static let relationAxioms: [Term] = {
    |                     |- warning: static property 'relationAxioms' is not concurrency-safe because non-'Sendable' type '[Term]' may have shared mutable state; this is an error in the Swift 6 language mode
    |                     |- note: add '@MainActor' to make static property 'relationAxioms' part of global actor 'MainActor'
    |                     `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 89 |     let x: Term = .var("x")
 90 |     let y: Term = .var("y")
/Users/admin/builder/spi-builder-workspace/Sources/LogicKit/Term.swift:1:13: note: enum 'Term' does not conform to the 'Sendable' protocol
  1 | public enum Term {
    |             `- note: enum 'Term' does not conform to the 'Sendable' protocol
  2 |
  3 |   /// A logic variable.
/Users/admin/builder/spi-builder-workspace/Sources/LogicKitBuiltins/Nat.swift:115:21: warning: static property 'arithmeticAxioms' is not concurrency-safe because non-'Sendable' type '[Term]' may have shared mutable state; this is an error in the Swift 6 language mode
113 |   }()
114 |
115 |   public static let arithmeticAxioms: [Term] = {
    |                     |- warning: static property 'arithmeticAxioms' is not concurrency-safe because non-'Sendable' type '[Term]' may have shared mutable state; this is an error in the Swift 6 language mode
    |                     |- note: add '@MainActor' to make static property 'arithmeticAxioms' part of global actor 'MainActor'
    |                     `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
116 |     let v: Term = .var("v")
117 |     let w: Term = .var("w")
/Users/admin/builder/spi-builder-workspace/Sources/LogicKit/Term.swift:1:13: note: enum 'Term' does not conform to the 'Sendable' protocol
  1 | public enum Term {
    |             `- note: enum 'Term' does not conform to the 'Sendable' protocol
  2 |
  3 |   /// A logic variable.
[15/17] Write Objects.LinkFileList
[16/17] Archiving libLogicKit.a
Build complete! (1.23s)
Build complete.
{
  "dependencies" : [
  ],
  "manifest_display_name" : "LogicKit",
  "name" : "LogicKit",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "LogicKit",
      "targets" : [
        "LogicKit",
        "LogicKitBuiltins"
      ],
      "type" : {
        "library" : [
          "static"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "LogicKitTests",
      "module_type" : "SwiftTarget",
      "name" : "LogicKitTests",
      "path" : "Tests/LogicKitTests",
      "sources" : [
        "BindingMapTests.swift",
        "KnowledgeBaseTests.swift",
        "LogicKitTests.swift",
        "XCTestManifests.swift"
      ],
      "target_dependencies" : [
        "LogicKit"
      ],
      "type" : "test"
    },
    {
      "c99name" : "LogicKitBuiltinsTests",
      "module_type" : "SwiftTarget",
      "name" : "LogicKitBuiltinsTests",
      "path" : "Tests/LogicKitBuiltinsTests",
      "sources" : [
        "ListTests.swift",
        "NatTests.swift"
      ],
      "target_dependencies" : [
        "LogicKitBuiltins"
      ],
      "type" : "test"
    },
    {
      "c99name" : "LogicKitBuiltins",
      "module_type" : "SwiftTarget",
      "name" : "LogicKitBuiltins",
      "path" : "Sources/LogicKitBuiltins",
      "product_memberships" : [
        "LogicKit"
      ],
      "sources" : [
        "List.swift",
        "Nat.swift"
      ],
      "target_dependencies" : [
        "LogicKit"
      ],
      "type" : "library"
    },
    {
      "c99name" : "LogicKit",
      "module_type" : "SwiftTarget",
      "name" : "LogicKit",
      "path" : "Sources/LogicKit",
      "product_memberships" : [
        "LogicKit"
      ],
      "sources" : [
        "AnswerSet.swift",
        "BindingMap.swift",
        "EDSL.swift",
        "KnowledgeBase.swift",
        "Logger.swift",
        "Realizer.swift",
        "Sequence+Extensions.swift",
        "Term.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "4.2"
}
Done.