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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 Promises, reference 2.4.0 (540318), with Swift 6.1 for macOS (SPM) on 28 Apr 2025 09:52:42 UTC.

Swift 6 data race errors: 0

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/google/promises.git
Reference: 2.4.0
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/google/promises
 * tag               2.4.0      -> FETCH_HEAD
HEAD is now at 540318e Bump version to 2.4.0.
Cloned https://github.com/google/promises.git
Revision (git rev-parse @):
540318ecedd63d883069ae7f1ed811a2df00b6ac
SUCCESS checkout https://github.com/google/promises.git at 2.4.0
========================================
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": "promises",
      "name": "Promises",
      "url": "https://github.com/google/promises.git",
      "version": "unspecified",
      "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/promises",
      "dependencies": [
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Fetching https://github.com/google/promises.git from cache
Fetched https://github.com/google/promises.git from cache (0.43s)
Creating working copy for https://github.com/google/promises.git
Working copy of https://github.com/google/promises.git resolved at 2.4.0 (540318e)
warning: '.resolve-product-dependencies': dependency 'promises' 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/google/promises.git
https://github.com/google/promises.git
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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...
[0/26] Write sources
[2/26] Copying PrivacyInfo.xcprivacy
[4/26] Write swift-version-2F0A5646E1D333AE.txt
[5/26] Compiling FBLPromises FBLPromise+Then.m
[6/26] Compiling FBLPromises FBLPromise+Wrap.m
[7/26] Compiling FBLPromises FBLPromise.m
[8/26] Compiling FBLPromises FBLPromise+Timeout.m
[9/26] Compiling FBLPromises FBLPromise+Retry.m
[10/26] Compiling FBLPromises FBLPromise+Validate.m
[11/26] Compiling FBLPromisesTestHelpers FBLPromisesTestInteroperability.m
[12/26] Compiling FBLPromises FBLPromise+Reduce.m
[12/26] Compiling FBLPromises FBLPromise+Recover.m
[14/26] Compiling FBLPromises FBLPromise+Race.m
[15/26] Compiling FBLPromises FBLPromise+Testing.m
[16/26] Compiling FBLPromises FBLPromise+Do.m
[17/26] Compiling FBLPromises FBLPromise+Delay.m
[18/26] Compiling FBLPromises FBLPromise+Catch.m
[19/26] Compiling FBLPromises FBLPromise+Async.m
[20/26] Compiling FBLPromises FBLPromiseError.m
[21/26] Compiling FBLPromises FBLPromise+Await.m
[22/26] Compiling FBLPromises FBLPromise+Any.m
[23/26] Compiling FBLPromises FBLPromise+Always.m
[24/26] Compiling FBLPromises FBLPromise+All.m
[25/26] Compiling FBLPromises resource_bundle_accessor.m
[27/45] Compiling Promises Promise+Wrap.swift
[28/45] Compiling Promises Promise.swift
[29/47] Compiling Promises Promise+Timeout.swift
[30/47] Compiling Promises Promise+Validate.swift
[31/47] Compiling Promises PromiseError.swift
[32/47] Compiling Promises resource_bundle_accessor.swift
[33/47] Compiling Promises Promise+Race.swift
[34/47] Compiling Promises Promise+Recover.swift
[35/47] Compiling Promises Promise+Testing.swift
[36/47] Compiling Promises Promise+Then.swift
[37/47] Compiling Promises Promise+Reduce.swift
[38/47] Compiling Promises Promise+Retry.swift
[39/47] Compiling Promises Promise+Delay.swift
[40/47] Compiling Promises Promise+Do.swift
[41/47] Compiling Promises Promise+All.swift
[42/47] Compiling Promises Promise+Always.swift
[43/47] Emitting module Promises
[44/47] Compiling Promises Promise+Await.swift
[45/47] Compiling Promises Promise+Catch.swift
[46/47] Compiling Promises Promise+Any.swift
[47/47] Compiling Promises Promise+Async.swift
[48/50] Compiling PromisesTestHelpers PromisesTestInteroperability.swift
[49/50] Compiling PromisesTestHelpers PromisesTestHelpers.swift
/Users/admin/builder/spi-builder-workspace/Sources/PromisesTestHelpers/PromisesTestHelpers.swift:23:7: warning: sending 'work' risks causing data races; this is an error in the Swift 6 language mode
21 |   public static func delay(_ interval: TimeInterval, work: @escaping () -> Void) {
22 |     DispatchQueue.main.asyncAfter(deadline: .now() + interval) {
23 |       work()
   |       |- warning: sending 'work' risks causing data races; this is an error in the Swift 6 language mode
   |       `- note: task-isolated 'work' is captured by a main actor-isolated closure. main actor-isolated uses in closure may race against later nonisolated uses
24 |     }
25 |   }
[50/50] Emitting module PromisesTestHelpers
Build complete! (6.47s)
Build complete.
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Done.