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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 package-conbini, reference main (59bd30), with Swift 6.1 for macOS (SPM) on 28 Apr 2025 18:49:02 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/dehesa/package-conbini.git
Reference: main
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/dehesa/package-conbini
 * branch            main       -> FETCH_HEAD
 * [new branch]      main       -> origin/main
HEAD is now at 59bd30b Update SPM definition
Cloned https://github.com/dehesa/package-conbini.git
Revision (git rev-parse @):
59bd30b449e453b6c7e6a28a45d8ef0a1330fa6b
SUCCESS checkout https://github.com/dehesa/package-conbini.git at main
========================================
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": "package-conbini",
      "name": "package-conbini",
      "url": "https://github.com/dehesa/package-conbini.git",
      "version": "unspecified",
      "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/package-conbini",
      "dependencies": [
      ]
    }
  ]
}
Fetching https://github.com/dehesa/package-conbini.git
[10/937] Fetching package-conbini
Fetched https://github.com/dehesa/package-conbini.git from cache (0.74s)
Creating working copy for https://github.com/dehesa/package-conbini.git
Working copy of https://github.com/dehesa/package-conbini.git resolved at main (59bd30b)
warning: '.resolve-product-dependencies': dependency 'package-conbini' 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/dehesa/package-conbini.git
https://github.com/dehesa/package-conbini.git
{
  "dependencies" : [
  ],
  "manifest_display_name" : "package-conbini",
  "name" : "package-conbini",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
    {
      "name" : "macos",
      "version" : "10.15"
    },
    {
      "name" : "ios",
      "version" : "13.0"
    },
    {
      "name" : "tvos",
      "version" : "13.0"
    },
    {
      "name" : "watchos",
      "version" : "6.0"
    }
  ],
  "products" : [
    {
      "name" : "Conbini",
      "targets" : [
        "Conbini"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    },
    {
      "name" : "ConbiniForTesting",
      "targets" : [
        "ConbiniForTesting"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "ConbiniTests",
      "module_type" : "SwiftTarget",
      "name" : "ConbiniTests",
      "path" : "tests/runtime",
      "sources" : [
        "operators/AssignOpTests.swift",
        "operators/AwaitOpTests.swift",
        "operators/DelayedRetryOpTests.swift",
        "operators/HandleEndOpTests.swift",
        "operators/ResultOpTests.swift",
        "operators/ThenOpTests.swift",
        "publishers/DeferredCompleteTests.swift",
        "publishers/DeferredFutureTests.swift",
        "publishers/DeferredPassthroughTests.swift",
        "publishers/DeferredResultTests.swift",
        "publishers/DeferredTryCompleteTests.swift",
        "publishers/DeferredTryValueTests.swift",
        "publishers/DeferredValueTests.swift",
        "subscribers/FixedSinkTests.swift",
        "subscribers/GraduatedSinkTests.swift",
        "utils/BufferTests.swift"
      ],
      "target_dependencies" : [
        "Conbini"
      ],
      "type" : "test"
    },
    {
      "c99name" : "ConbiniForTestingTests",
      "module_type" : "SwiftTarget",
      "name" : "ConbiniForTestingTests",
      "path" : "tests/testing",
      "sources" : [
        "ExpectationsTests.swift"
      ],
      "target_dependencies" : [
        "Conbini",
        "ConbiniForTesting"
      ],
      "type" : "test"
    },
    {
      "c99name" : "ConbiniForTesting",
      "module_type" : "SwiftTarget",
      "name" : "ConbiniForTesting",
      "path" : "sources/testing",
      "product_memberships" : [
        "ConbiniForTesting"
      ],
      "sources" : [
        "Expectations.swift",
        "XCTestCase.swift"
      ],
      "type" : "library"
    },
    {
      "c99name" : "Conbini",
      "module_type" : "SwiftTarget",
      "name" : "Conbini",
      "path" : "sources/runtime",
      "product_memberships" : [
        "Conbini"
      ],
      "sources" : [
        "operators/AssignOp.swift",
        "operators/AwaitOp.swift",
        "operators/HandleEndOp.swift",
        "operators/ResultOp.swift",
        "operators/RetryOp.swift",
        "operators/SinkOp.swift",
        "operators/ThenOp.swift",
        "publishers/DeferredComplete.swift",
        "publishers/DeferredFuture.swift",
        "publishers/DeferredPassthrough.swift",
        "publishers/DeferredResult.swift",
        "publishers/DeferredTryComplete.swift",
        "publishers/DeferredTryValue.swift",
        "publishers/DeferredValue.swift",
        "publishers/HandleEnd.swift",
        "publishers/Retry.swift",
        "publishers/Then.swift",
        "subscribers/FixedSink.swift",
        "subscribers/GraduatedSink.swift",
        "utils/Buffer.swift",
        "utils/Lock.swift",
        "utils/State.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...
[0/3] Write sources
[2/3] Write swift-version-2F0A5646E1D333AE.txt
[4/27] Emitting module Conbini
/Users/admin/builder/spi-builder-workspace/sources/runtime/publishers/Retry.swift:35:25: warning: generic parameter 'S' shadows generic parameter from outer scope with the same name; this is an error in the Swift 6 language mode
  6 |   ///
  7 |   /// Please notice that any value sent before a failure is still received downstream.
  8 |   public struct DelayedRetry<Upstream,S>: Publisher where Upstream:Publisher, S:Scheduler {
    |                                       `- note: 'S' previously declared here
  9 |     public typealias Output = Upstream.Output
 10 |     public typealias Failure = Upstream.Failure
    :
 33 |     }
 34 |
 35 |     public func receive<S>(subscriber: S) where S:Subscriber, S.Input==Output, S.Failure==Failure {
    |                         `- warning: generic parameter 'S' shadows generic parameter from outer scope with the same name; this is an error in the Swift 6 language mode
 36 |       let conduit = DelayedRetry._Conduit(upstream: self.upstream, downstream: subscriber,
 37 |                                          scheduler: self.scheduler, tolerance: self.tolerance, options: self.options,
[5/29] Compiling Conbini Lock.swift
[6/29] Compiling Conbini State.swift
[7/29] Compiling Conbini DeferredResult.swift
[8/29] Compiling Conbini DeferredTryComplete.swift
[9/29] Compiling Conbini GraduatedSink.swift
[10/29] Compiling Conbini Buffer.swift
[11/29] Compiling Conbini ThenOp.swift
[12/29] Compiling Conbini DeferredComplete.swift
[13/29] Compiling Conbini Then.swift
[14/29] Compiling Conbini FixedSink.swift
[15/29] Compiling Conbini DeferredFuture.swift
[16/29] Compiling Conbini DeferredPassthrough.swift
[17/29] Compiling Conbini AssignOp.swift
[18/29] Compiling Conbini AwaitOp.swift
[19/29] Compiling Conbini HandleEndOp.swift
[20/29] Compiling Conbini DeferredTryValue.swift
[21/29] Compiling Conbini DeferredValue.swift
[22/29] Compiling Conbini ResultOp.swift
[23/29] Compiling Conbini RetryOp.swift
[24/29] Compiling Conbini SinkOp.swift
[25/29] Compiling Conbini HandleEnd.swift
/Users/admin/builder/spi-builder-workspace/sources/runtime/publishers/Retry.swift:35:25: warning: generic parameter 'S' shadows generic parameter from outer scope with the same name; this is an error in the Swift 6 language mode
  6 |   ///
  7 |   /// Please notice that any value sent before a failure is still received downstream.
  8 |   public struct DelayedRetry<Upstream,S>: Publisher where Upstream:Publisher, S:Scheduler {
    |                                       `- note: 'S' previously declared here
  9 |     public typealias Output = Upstream.Output
 10 |     public typealias Failure = Upstream.Failure
    :
 33 |     }
 34 |
 35 |     public func receive<S>(subscriber: S) where S:Subscriber, S.Input==Output, S.Failure==Failure {
    |                         `- warning: generic parameter 'S' shadows generic parameter from outer scope with the same name; this is an error in the Swift 6 language mode
 36 |       let conduit = DelayedRetry._Conduit(upstream: self.upstream, downstream: subscriber,
 37 |                                          scheduler: self.scheduler, tolerance: self.tolerance, options: self.options,
[26/29] Compiling Conbini Retry.swift
/Users/admin/builder/spi-builder-workspace/sources/runtime/publishers/Retry.swift:35:25: warning: generic parameter 'S' shadows generic parameter from outer scope with the same name; this is an error in the Swift 6 language mode
  6 |   ///
  7 |   /// Please notice that any value sent before a failure is still received downstream.
  8 |   public struct DelayedRetry<Upstream,S>: Publisher where Upstream:Publisher, S:Scheduler {
    |                                       `- note: 'S' previously declared here
  9 |     public typealias Output = Upstream.Output
 10 |     public typealias Failure = Upstream.Failure
    :
 33 |     }
 34 |
 35 |     public func receive<S>(subscriber: S) where S:Subscriber, S.Input==Output, S.Failure==Failure {
    |                         `- warning: generic parameter 'S' shadows generic parameter from outer scope with the same name; this is an error in the Swift 6 language mode
 36 |       let conduit = DelayedRetry._Conduit(upstream: self.upstream, downstream: subscriber,
 37 |                                          scheduler: self.scheduler, tolerance: self.tolerance, options: self.options,
[27/29] Compiling ConbiniForTesting XCTestCase.swift
[28/29] Compiling ConbiniForTesting Expectations.swift
[29/29] Emitting module ConbiniForTesting
Build complete! (8.19s)
Build complete.
{
  "dependencies" : [
  ],
  "manifest_display_name" : "package-conbini",
  "name" : "package-conbini",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
    {
      "name" : "macos",
      "version" : "10.15"
    },
    {
      "name" : "ios",
      "version" : "13.0"
    },
    {
      "name" : "tvos",
      "version" : "13.0"
    },
    {
      "name" : "watchos",
      "version" : "6.0"
    }
  ],
  "products" : [
    {
      "name" : "Conbini",
      "targets" : [
        "Conbini"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    },
    {
      "name" : "ConbiniForTesting",
      "targets" : [
        "ConbiniForTesting"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "ConbiniTests",
      "module_type" : "SwiftTarget",
      "name" : "ConbiniTests",
      "path" : "tests/runtime",
      "sources" : [
        "operators/AssignOpTests.swift",
        "operators/AwaitOpTests.swift",
        "operators/DelayedRetryOpTests.swift",
        "operators/HandleEndOpTests.swift",
        "operators/ResultOpTests.swift",
        "operators/ThenOpTests.swift",
        "publishers/DeferredCompleteTests.swift",
        "publishers/DeferredFutureTests.swift",
        "publishers/DeferredPassthroughTests.swift",
        "publishers/DeferredResultTests.swift",
        "publishers/DeferredTryCompleteTests.swift",
        "publishers/DeferredTryValueTests.swift",
        "publishers/DeferredValueTests.swift",
        "subscribers/FixedSinkTests.swift",
        "subscribers/GraduatedSinkTests.swift",
        "utils/BufferTests.swift"
      ],
      "target_dependencies" : [
        "Conbini"
      ],
      "type" : "test"
    },
    {
      "c99name" : "ConbiniForTestingTests",
      "module_type" : "SwiftTarget",
      "name" : "ConbiniForTestingTests",
      "path" : "tests/testing",
      "sources" : [
        "ExpectationsTests.swift"
      ],
      "target_dependencies" : [
        "Conbini",
        "ConbiniForTesting"
      ],
      "type" : "test"
    },
    {
      "c99name" : "ConbiniForTesting",
      "module_type" : "SwiftTarget",
      "name" : "ConbiniForTesting",
      "path" : "sources/testing",
      "product_memberships" : [
        "ConbiniForTesting"
      ],
      "sources" : [
        "Expectations.swift",
        "XCTestCase.swift"
      ],
      "type" : "library"
    },
    {
      "c99name" : "Conbini",
      "module_type" : "SwiftTarget",
      "name" : "Conbini",
      "path" : "sources/runtime",
      "product_memberships" : [
        "Conbini"
      ],
      "sources" : [
        "operators/AssignOp.swift",
        "operators/AwaitOp.swift",
        "operators/HandleEndOp.swift",
        "operators/ResultOp.swift",
        "operators/RetryOp.swift",
        "operators/SinkOp.swift",
        "operators/ThenOp.swift",
        "publishers/DeferredComplete.swift",
        "publishers/DeferredFuture.swift",
        "publishers/DeferredPassthrough.swift",
        "publishers/DeferredResult.swift",
        "publishers/DeferredTryComplete.swift",
        "publishers/DeferredTryValue.swift",
        "publishers/DeferredValue.swift",
        "publishers/HandleEnd.swift",
        "publishers/Retry.swift",
        "publishers/Then.swift",
        "subscribers/FixedSink.swift",
        "subscribers/GraduatedSink.swift",
        "utils/Buffer.swift",
        "utils/Lock.swift",
        "utils/State.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.1"
}
Done.