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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 Scout, reference master (76a53a), with Swift 6.1 for macOS (SPM) on 25 Apr 2025 00:26:52 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: 4.61.0
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/bgerstle/scout.git
Reference: master
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/bgerstle/scout
 * branch            master     -> FETCH_HEAD
 * [new branch]      master     -> origin/master
HEAD is now at 76a53a4 Playground tweaks
Cloned https://github.com/bgerstle/scout.git
Revision (git rev-parse @):
76a53a47461f3dec6b63bcac4db50e7947a0c2c5
SUCCESS checkout https://github.com/bgerstle/scout.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": "scout",
      "name": "Scout",
      "url": "https://github.com/bgerstle/scout.git",
      "version": "unspecified",
      "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/scout",
      "dependencies": [
      ]
    }
  ]
}
Fetching https://github.com/bgerstle/scout.git
[1/730] Fetching scout
Fetched https://github.com/bgerstle/scout.git from cache (0.65s)
Creating working copy for https://github.com/bgerstle/scout.git
Working copy of https://github.com/bgerstle/scout.git resolved at master (76a53a4)
warning: '.resolve-product-dependencies': dependency 'scout' 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/bgerstle/scout.git
https://github.com/bgerstle/scout.git
{
  "dependencies" : [
  ],
  "manifest_display_name" : "Scout",
  "name" : "Scout",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "Scout",
      "targets" : [
        "Scout"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "ScoutTests",
      "module_type" : "SwiftTarget",
      "name" : "ScoutTests",
      "path" : "Tests/ScoutTests",
      "sources" : [
        "Func/ArgMatcherTests.swift",
        "Func/ExpectFuncTests.swift",
        "Helpers/MockExample.swift",
        "Helpers/ScoutTestCase.swift",
        "Mock/MockAssertionTests.swift",
        "Var/ExpectVarTests.swift",
        "XCTestManifests.swift"
      ],
      "target_dependencies" : [
        "Scout"
      ],
      "type" : "test"
    },
    {
      "c99name" : "Scout",
      "module_type" : "SwiftTarget",
      "name" : "Scout",
      "path" : "Sources/Scout",
      "product_memberships" : [
        "Scout"
      ],
      "sources" : [
        "Expect/ArgMatcher.swift",
        "Expect/ExpectDSL.swift",
        "Expect/ExpectFuncDSL.swift",
        "Expect/ExpectVarDSL.swift",
        "Expect/Expectation.swift",
        "Mock/CallDSL.swift",
        "Mock/Mock.swift",
        "Mock/MockFailure.swift",
        "Mock/Mockable.swift",
        "Mock/VarDSL.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
[3/12] Compiling Scout Mockable.swift
[4/12] Compiling Scout CallDSL.swift
[5/12] Compiling Scout Mock.swift
[6/12] Compiling Scout Expectation.swift
/Users/admin/builder/spi-builder-workspace/Sources/Scout/Expect/Expectation.swift:48:30: warning: using 'class' keyword to define a class-constrained protocol is deprecated; use 'AnyObject' instead
 46 |
 47 | // Interface for all expectations of a mock.
 48 | public protocol Expectation: class {
    |                              `- warning: using 'class' keyword to define a class-constrained protocol is deprecated; use 'AnyObject' instead
 49 |     func hasNext() -> Bool
 50 |     func nextValue() -> Any?
[7/12] Compiling Scout ExpectFuncDSL.swift
[8/12] Compiling Scout ExpectVarDSL.swift
[9/12] Compiling Scout ExpectDSL.swift
[10/12] Compiling Scout ArgMatcher.swift
/Users/admin/builder/spi-builder-workspace/Sources/Scout/Expect/ArgMatcher.swift:15:5: warning: let 'nil' is not concurrency-safe because non-'Sendable' type 'NilMatcher' may have shared mutable state; this is an error in the Swift 6 language mode
13 | }
14 |
15 | let `nil` = NilMatcher()
   |     |- warning: let 'nil' is not concurrency-safe because non-'Sendable' type 'NilMatcher' may have shared mutable state; this is an error in the Swift 6 language mode
   |     |- note: add '@MainActor' to make let 'nil' part of global actor 'MainActor'
   |     `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
16 |
17 | class NilMatcher : ArgMatcher {
   |       `- note: class 'NilMatcher' does not conform to the 'Sendable' protocol
18 |     public func matches(arg: Any?) -> Bool {
19 |         return arg == nil
[11/12] Emitting module Scout
/Users/admin/builder/spi-builder-workspace/Sources/Scout/Expect/ArgMatcher.swift:15:5: warning: let 'nil' is not concurrency-safe because non-'Sendable' type 'NilMatcher' may have shared mutable state; this is an error in the Swift 6 language mode
13 | }
14 |
15 | let `nil` = NilMatcher()
   |     |- warning: let 'nil' is not concurrency-safe because non-'Sendable' type 'NilMatcher' may have shared mutable state; this is an error in the Swift 6 language mode
   |     |- note: add '@MainActor' to make let 'nil' part of global actor 'MainActor'
   |     `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
16 |
17 | class NilMatcher : ArgMatcher {
   |       `- note: class 'NilMatcher' does not conform to the 'Sendable' protocol
18 |     public func matches(arg: Any?) -> Bool {
19 |         return arg == nil
/Users/admin/builder/spi-builder-workspace/Sources/Scout/Expect/Expectation.swift:48:30: warning: using 'class' keyword to define a class-constrained protocol is deprecated; use 'AnyObject' instead
 46 |
 47 | // Interface for all expectations of a mock.
 48 | public protocol Expectation: class {
    |                              `- warning: using 'class' keyword to define a class-constrained protocol is deprecated; use 'AnyObject' instead
 49 |     func hasNext() -> Bool
 50 |     func nextValue() -> Any?
[12/12] Compiling Scout MockFailure.swift
[13/13] Compiling Scout VarDSL.swift
Build complete! (11.99s)
Build complete.
{
  "dependencies" : [
  ],
  "manifest_display_name" : "Scout",
  "name" : "Scout",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "Scout",
      "targets" : [
        "Scout"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "ScoutTests",
      "module_type" : "SwiftTarget",
      "name" : "ScoutTests",
      "path" : "Tests/ScoutTests",
      "sources" : [
        "Func/ArgMatcherTests.swift",
        "Func/ExpectFuncTests.swift",
        "Helpers/MockExample.swift",
        "Helpers/ScoutTestCase.swift",
        "Mock/MockAssertionTests.swift",
        "Var/ExpectVarTests.swift",
        "XCTestManifests.swift"
      ],
      "target_dependencies" : [
        "Scout"
      ],
      "type" : "test"
    },
    {
      "c99name" : "Scout",
      "module_type" : "SwiftTarget",
      "name" : "Scout",
      "path" : "Sources/Scout",
      "product_memberships" : [
        "Scout"
      ],
      "sources" : [
        "Expect/ArgMatcher.swift",
        "Expect/ExpectDSL.swift",
        "Expect/ExpectFuncDSL.swift",
        "Expect/ExpectVarDSL.swift",
        "Expect/Expectation.swift",
        "Mock/CallDSL.swift",
        "Mock/Mock.swift",
        "Mock/MockFailure.swift",
        "Mock/Mockable.swift",
        "Mock/VarDSL.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.0"
}
Done.