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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 STTextKitPlus, reference main (4655b7), with Swift 6.1 for macOS (SPM) on 30 Apr 2025 09:30:14 UTC.

Swift 6 data race errors: 1

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/krzyzanowskim/STTextKitPlus.git
Reference: main
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/krzyzanowskim/STTextKitPlus
 * branch            main       -> FETCH_HEAD
 * [new branch]      main       -> origin/main
HEAD is now at 4655b76 Remove copyright year from license and source files
Cloned https://github.com/krzyzanowskim/STTextKitPlus.git
Revision (git rev-parse @):
4655b76fce111082749fbc1ff7e5b2da6912b0ac
SUCCESS checkout https://github.com/krzyzanowskim/STTextKitPlus.git at main
========================================
Build
========================================
Selected platform:         macosSpm
Swift version:             6.1
Building package at path:  $PWD
https://github.com/krzyzanowskim/STTextKitPlus.git
https://github.com/krzyzanowskim/STTextKitPlus.git
{
  "dependencies" : [
  ],
  "manifest_display_name" : "STTextKitPlus",
  "name" : "STTextKitPlus",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
    {
      "name" : "macos",
      "version" : "12.0"
    },
    {
      "name" : "maccatalyst",
      "version" : "15.0"
    },
    {
      "name" : "ios",
      "version" : "15.0"
    }
  ],
  "products" : [
    {
      "name" : "STTextKitPlus",
      "targets" : [
        "STTextKitPlus"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "STTextKitPlus",
      "module_type" : "SwiftTarget",
      "name" : "STTextKitPlus",
      "path" : "Sources/STTextKitPlus",
      "product_memberships" : [
        "STTextKitPlus"
      ],
      "sources" : [
        "NSRange.swift",
        "NSTextContentManager.swift",
        "NSTextLayoutFragment.swift",
        "NSTextLayoutManager.swift",
        "NSTextLineFragment.swift",
        "NSTextLocation+Equatable.swift",
        "NSTextRange.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.7"
}
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
[3/10] Compiling STTextKitPlus NSTextLineFragment.swift
[4/10] Compiling STTextKitPlus NSTextLocation+Equatable.swift
[5/10] Compiling STTextKitPlus NSTextRange.swift
[6/10] Compiling STTextKitPlus NSRange.swift
[7/10] Compiling STTextKitPlus NSTextLayoutFragment.swift
[8/10] Compiling STTextKitPlus NSTextLayoutManager.swift
<unknown>:0: note: a function type must be marked '@Sendable' to conform to 'Sendable'
/Users/admin/builder/spi-builder-workspace/Sources/STTextKitPlus/NSTextLayoutManager.swift:184:13: warning: let '_textSelectionInsertionPointFilter' is not concurrency-safe because non-'Sendable' type '(NSTextSelection) -> Bool' may have shared mutable state; this is an error in the Swift 6 language mode
182 | }
183 |
184 | private let _textSelectionInsertionPointFilter: (NSTextSelection) -> Bool = { textSelection in
    |             |- warning: let '_textSelectionInsertionPointFilter' is not concurrency-safe because non-'Sendable' type '(NSTextSelection) -> Bool' may have shared mutable state; this is an error in the Swift 6 language mode
    |             |- note: add '@MainActor' to make let '_textSelectionInsertionPointFilter' part of global actor 'MainActor'
    |             `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
185 |     !textSelection.isLogical && textSelection.textRanges.contains(where: \.isEmpty)
186 | }
[9/10] Emitting module STTextKitPlus
<unknown>:0: note: a function type must be marked '@Sendable' to conform to 'Sendable'
/Users/admin/builder/spi-builder-workspace/Sources/STTextKitPlus/NSTextLayoutManager.swift:184:13: warning: let '_textSelectionInsertionPointFilter' is not concurrency-safe because non-'Sendable' type '(NSTextSelection) -> Bool' may have shared mutable state; this is an error in the Swift 6 language mode
182 | }
183 |
184 | private let _textSelectionInsertionPointFilter: (NSTextSelection) -> Bool = { textSelection in
    |             |- warning: let '_textSelectionInsertionPointFilter' is not concurrency-safe because non-'Sendable' type '(NSTextSelection) -> Bool' may have shared mutable state; this is an error in the Swift 6 language mode
    |             |- note: add '@MainActor' to make let '_textSelectionInsertionPointFilter' part of global actor 'MainActor'
    |             `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
185 |     !textSelection.isLogical && textSelection.textRanges.contains(where: \.isEmpty)
186 | }
[10/10] Compiling STTextKitPlus NSTextContentManager.swift
Build complete! (8.04s)
Build complete.
{
  "dependencies" : [
  ],
  "manifest_display_name" : "STTextKitPlus",
  "name" : "STTextKitPlus",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
    {
      "name" : "macos",
      "version" : "12.0"
    },
    {
      "name" : "maccatalyst",
      "version" : "15.0"
    },
    {
      "name" : "ios",
      "version" : "15.0"
    }
  ],
  "products" : [
    {
      "name" : "STTextKitPlus",
      "targets" : [
        "STTextKitPlus"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "STTextKitPlus",
      "module_type" : "SwiftTarget",
      "name" : "STTextKitPlus",
      "path" : "Sources/STTextKitPlus",
      "product_memberships" : [
        "STTextKitPlus"
      ],
      "sources" : [
        "NSRange.swift",
        "NSTextContentManager.swift",
        "NSTextLayoutFragment.swift",
        "NSTextLayoutManager.swift",
        "NSTextLineFragment.swift",
        "NSTextLocation+Equatable.swift",
        "NSTextRange.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.7"
}
Done.