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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

Failed to build StreamKit, reference master (821074), with Swift 6.1 for iOS using Xcode 16.3 on 24 Apr 2025 17:18:16 UTC.

Build Command

No build command. This typically means the build failed at an early stage where we determine the build command.

Build Log

========================================
RunAll
========================================
Builder version: 4.61.0
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/skylab-inc/streamkit.git
Reference: master
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/skylab-inc/streamkit
 * branch            master     -> FETCH_HEAD
 * [new branch]      master     -> origin/master
HEAD is now at 8210749 Update README.md
Cloned https://github.com/skylab-inc/streamkit.git
Revision (git rev-parse @):
821074970d0212e5556f4cf272b925209adbd95e
SUCCESS checkout https://github.com/skylab-inc/streamkit.git at master
========================================
Build
========================================
Selected platform:         iOS
Swift version:             6.1
Building package at path:  $PWD
https://github.com/skylab-inc/streamkit.git
https://github.com/skylab-inc/streamkit.git
{
  "dependencies" : [
    {
      "identity" : "promisekit",
      "requirement" : {
        "range" : [
          {
            "lower_bound" : "4.5.0",
            "upper_bound" : "5.0.0"
          }
        ]
      },
      "type" : "sourceControl",
      "url" : "https://github.com/mxcl/PromiseKit.git"
    }
  ],
  "manifest_display_name" : "StreamKit",
  "name" : "StreamKit",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "StreamKit",
      "targets" : [
        "StreamKit"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "StreamKitTests",
      "module_type" : "SwiftTarget",
      "name" : "StreamKitTests",
      "path" : "Tests/StreamKitTests",
      "sources" : [
        "Tests.swift"
      ],
      "target_dependencies" : [
        "StreamKit"
      ],
      "type" : "test"
    },
    {
      "c99name" : "StreamKit",
      "module_type" : "SwiftTarget",
      "name" : "StreamKit",
      "path" : "Sources/StreamKit",
      "product_dependencies" : [
        "PromiseKit"
      ],
      "product_memberships" : [
        "StreamKit"
      ],
      "sources" : [
        "Bag.swift",
        "Disposable.swift",
        "Error.swift",
        "Event.swift",
        "Observer.swift",
        "Promise.swift",
        "Signal.swift",
        "Source.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "4.0"
}
Command line invocation:
    /Applications/Xcode-16.3.0.app/Contents/Developer/usr/bin/xcodebuild -IDEClonedSourcePackagesDirPathOverride=/Users/admin/builder/spi-builder-workspace/.dependencies -resolvePackageDependencies
Resolve Package Graph
Fetching from https://github.com/mxcl/PromiseKit.git
package 'package.swift' is using Swift tools version 3.1.0 which is no longer supported; consider using '// swift-tools-version: 6.1' to specify the current tools versionResolve Package Graph
Updating from https://github.com/mxcl/PromiseKit.git
package 'package.swift' is using Swift tools version 3.1.0 which is no longer supported; consider using '// swift-tools-version: 6.1' to specify the current tools versionResolve Package Graph
Updating from https://github.com/mxcl/PromiseKit.git
package 'package.swift' is using Swift tools version 3.1.0 which is no longer supported; consider using '// swift-tools-version: 6.1' to specify the current tools version
Resolved source packages:
  spi-builder-workspace: (null)
2025-04-24 10:18:14.737 xcodebuild[512:2837] Writing error result bundle to /var/folders/5k/5yc19ymj0jqd5v0zvgfqz0xw0000gn/T/ResultBundle_2025-24-04_10-18-0014.xcresult
xcodebuild: error: Could not resolve package dependencies:
  package 'package.swift' is using Swift tools version 3.1.0 which is no longer supported; consider using '// swift-tools-version: 6.1' to specify the current tools version
Command line invocation:
    /Applications/Xcode-16.3.0.app/Contents/Developer/usr/bin/xcodebuild -IDEClonedSourcePackagesDirPathOverride=/Users/admin/builder/spi-builder-workspace/.dependencies -resolvePackageDependencies
Resolve Package Graph
Updating from https://github.com/mxcl/PromiseKit.git
package 'package.swift' is using Swift tools version 3.1.0 which is no longer supported; consider using '// swift-tools-version: 6.1' to specify the current tools version
Resolved source packages:
  spi-builder-workspace: (null)
2025-04-24 10:18:16.919 xcodebuild[835:4195] Writing error result bundle to /var/folders/5k/5yc19ymj0jqd5v0zvgfqz0xw0000gn/T/ResultBundle_2025-24-04_10-18-0016.xcresult
xcodebuild: error: Could not resolve package dependencies:
  package 'package.swift' is using Swift tools version 3.1.0 which is no longer supported; consider using '// swift-tools-version: 6.1' to specify the current tools version
BUILD FAILURE 6.1 iOS