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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 Serializer, reference master (2bad36), with Swift 6.1 for macOS (SPM) on 24 Apr 2025 12:49:24 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/nobodynada/serializer.git
Reference: master
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/nobodynada/serializer
 * branch            master     -> FETCH_HEAD
 * [new branch]      master     -> origin/master
HEAD is now at 2bad36b add canEncode method to Serializer protocol
Cloned https://github.com/nobodynada/serializer.git
Revision (git rev-parse @):
2bad36bfe5ede3f3914835b2e6c0432bf1a31853
SUCCESS checkout https://github.com/nobodynada/serializer.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": "serializer",
      "name": "Serializer",
      "url": "https://github.com/nobodynada/serializer.git",
      "version": "unspecified",
      "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/serializer",
      "dependencies": [
      ]
    }
  ]
}
Fetching https://github.com/nobodynada/serializer.git
[1/168] Fetching serializer
Fetched https://github.com/nobodynada/serializer.git from cache (0.62s)
Creating working copy for https://github.com/nobodynada/serializer.git
Working copy of https://github.com/nobodynada/serializer.git resolved at master (2bad36b)
warning: '.resolve-product-dependencies': dependency 'serializer' 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/nobodynada/serializer.git
https://github.com/nobodynada/serializer.git
{
  "dependencies" : [
  ],
  "manifest_display_name" : "Serializer",
  "name" : "Serializer",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "Serializer",
      "targets" : [
        "Serializer"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "SerializerTests",
      "module_type" : "SwiftTarget",
      "name" : "SerializerTests",
      "path" : "Tests/SerializerTests",
      "sources" : [
        "SerializerTests.swift"
      ],
      "target_dependencies" : [
        "Serializer"
      ],
      "type" : "test"
    },
    {
      "c99name" : "Serializer",
      "module_type" : "SwiftTarget",
      "name" : "Serializer",
      "path" : "Sources/Serializer",
      "product_memberships" : [
        "Serializer"
      ],
      "sources" : [
        "Deserialization.swift",
        "Serialization.swift",
        "Serializer.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "4.0"
}
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
[3/6] Compiling Serializer Serialization.swift
[4/6] Compiling Serializer Serializer.swift
[5/6] Compiling Serializer Deserialization.swift
/Users/admin/builder/spi-builder-workspace/Sources/Serializer/Deserialization.swift:13:10: warning: associated value 'typeMismatch(expected:actual:)' of 'Sendable'-conforming enum 'DecodingError' has non-sendable type 'Serializable'; this is an error in the Swift 6 language mode
 11 |
 12 | public enum DecodingError: Error {
 13 |     case typeMismatch(expected: Any.Type, actual: Serializable)
    |          `- warning: associated value 'typeMismatch(expected:actual:)' of 'Sendable'-conforming enum 'DecodingError' has non-sendable type 'Serializable'; this is an error in the Swift 6 language mode
 14 |     case unkeyedContainerAtEnd
 15 |     case unexpectedNull
/Users/admin/builder/spi-builder-workspace/Sources/Serializer/Serializer.swift:125:13: note: consider making enum 'Serializable' conform to the 'Sendable' protocol
123 |
124 | ///A `Serializable` stores an object in a format which may be easily serialized.
125 | public enum Serializable {
    |             `- note: consider making enum 'Serializable' conform to the 'Sendable' protocol
126 |     case null
127 |
/Users/admin/builder/spi-builder-workspace/Sources/Serializer/Deserialization.swift:19:13: warning: var 'dateFormatter' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
 17 | }
 18 |
 19 | private var dateFormatter: DateFormatter = {
    |             |- warning: var 'dateFormatter' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
    |             |- note: convert 'dateFormatter' to a 'let' constant to make 'Sendable' shared state immutable
    |             |- note: add '@MainActor' to make var 'dateFormatter' part of global actor 'MainActor'
    |             `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 20 |     var formatter = DateFormatter()
 21 |     formatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ssZZZZ"
[6/6] Emitting module Serializer
/Users/admin/builder/spi-builder-workspace/Sources/Serializer/Deserialization.swift:13:10: warning: associated value 'typeMismatch(expected:actual:)' of 'Sendable'-conforming enum 'DecodingError' has non-sendable type 'Serializable'; this is an error in the Swift 6 language mode
 11 |
 12 | public enum DecodingError: Error {
 13 |     case typeMismatch(expected: Any.Type, actual: Serializable)
    |          `- warning: associated value 'typeMismatch(expected:actual:)' of 'Sendable'-conforming enum 'DecodingError' has non-sendable type 'Serializable'; this is an error in the Swift 6 language mode
 14 |     case unkeyedContainerAtEnd
 15 |     case unexpectedNull
/Users/admin/builder/spi-builder-workspace/Sources/Serializer/Serializer.swift:125:13: note: consider making enum 'Serializable' conform to the 'Sendable' protocol
123 |
124 | ///A `Serializable` stores an object in a format which may be easily serialized.
125 | public enum Serializable {
    |             `- note: consider making enum 'Serializable' conform to the 'Sendable' protocol
126 |     case null
127 |
/Users/admin/builder/spi-builder-workspace/Sources/Serializer/Deserialization.swift:19:13: warning: var 'dateFormatter' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
 17 | }
 18 |
 19 | private var dateFormatter: DateFormatter = {
    |             |- warning: var 'dateFormatter' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
    |             |- note: convert 'dateFormatter' to a 'let' constant to make 'Sendable' shared state immutable
    |             |- note: add '@MainActor' to make var 'dateFormatter' part of global actor 'MainActor'
    |             `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 20 |     var formatter = DateFormatter()
 21 |     formatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ssZZZZ"
Build complete! (3.97s)
Build complete.
{
  "dependencies" : [
  ],
  "manifest_display_name" : "Serializer",
  "name" : "Serializer",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "Serializer",
      "targets" : [
        "Serializer"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "SerializerTests",
      "module_type" : "SwiftTarget",
      "name" : "SerializerTests",
      "path" : "Tests/SerializerTests",
      "sources" : [
        "SerializerTests.swift"
      ],
      "target_dependencies" : [
        "Serializer"
      ],
      "type" : "test"
    },
    {
      "c99name" : "Serializer",
      "module_type" : "SwiftTarget",
      "name" : "Serializer",
      "path" : "Sources/Serializer",
      "product_memberships" : [
        "Serializer"
      ],
      "sources" : [
        "Deserialization.swift",
        "Serialization.swift",
        "Serializer.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "4.0"
}
Done.