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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 Coordinator, reference master (eecb45), with Swift 6.1 for macOS (SPM) on 29 Apr 2025 18:15:17 UTC.

Build Command

env DEVELOPER_DIR=/Applications/Xcode-16.3.0.app xcrun swift build --arch arm64

Build Log

========================================
RunAll
========================================
Builder version: 4.61.1
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/radianttap/Coordinator.git
Reference: master
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/radianttap/Coordinator
 * branch            master     -> FETCH_HEAD
 * [new branch]      master     -> origin/master
HEAD is now at eecb45c Swift 6 language mode includes strict-concurrency, so feature flag is not needed
Cloned https://github.com/radianttap/Coordinator.git
Revision (git rev-parse @):
eecb45ce8298402f3b3280829a3b69fcde8071e9
SUCCESS checkout https://github.com/radianttap/Coordinator.git at master
========================================
Build
========================================
Selected platform:         macosSpm
Swift version:             6.1
Building package at path:  $PWD
https://github.com/radianttap/Coordinator.git
https://github.com/radianttap/Coordinator.git
{
  "dependencies" : [
  ],
  "manifest_display_name" : "Coordinator",
  "name" : "Coordinator",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
    {
      "name" : "ios",
      "version" : "15.0"
    },
    {
      "name" : "tvos",
      "version" : "15.0"
    },
    {
      "name" : "visionos",
      "version" : "1.0"
    }
  ],
  "products" : [
    {
      "name" : "Coordinator",
      "targets" : [
        "Coordinator"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "swift_languages_versions" : [
    "6"
  ],
  "targets" : [
    {
      "c99name" : "Coordinator",
      "module_type" : "SwiftTarget",
      "name" : "Coordinator",
      "path" : "Sources/Coordinator",
      "product_memberships" : [
        "Coordinator"
      ],
      "sources" : [
        "Coordinating.swift",
        "Coordinator.swift",
        "NavigationCoordinator.swift",
        "UIKit-CoordinatingExtensions.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "6.0"
}
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
Building for debugging...
[0/2] Write sources
[1/2] Write swift-version-2F0A5646E1D333AE.txt
error: emit-module command failed with exit code 1 (use -v to see invocation)
[3/7] Compiling Coordinator UIKit-CoordinatingExtensions.swift
/Users/admin/builder/spi-builder-workspace/Sources/Coordinator/Coordinating.swift:9:8: error: no such module 'UIKit'
 7 | //
 8 |
 9 | import UIKit
   |        `- error: no such module 'UIKit'
10 |
11 | ///	Protocol to define what is required for an object to be Coordinator.
[4/7] Emitting module Coordinator
/Users/admin/builder/spi-builder-workspace/Sources/Coordinator/Coordinating.swift:9:8: error: no such module 'UIKit'
 7 | //
 8 |
 9 | import UIKit
   |        `- error: no such module 'UIKit'
10 |
11 | ///	Protocol to define what is required for an object to be Coordinator.
[5/7] Compiling Coordinator Coordinator.swift
/Users/admin/builder/spi-builder-workspace/Sources/Coordinator/Coordinating.swift:9:8: error: no such module 'UIKit'
 7 | //
 8 |
 9 | import UIKit
   |        `- error: no such module 'UIKit'
10 |
11 | ///	Protocol to define what is required for an object to be Coordinator.
[6/7] Compiling Coordinator NavigationCoordinator.swift
/Users/admin/builder/spi-builder-workspace/Sources/Coordinator/Coordinating.swift:9:8: error: no such module 'UIKit'
 7 | //
 8 |
 9 | import UIKit
   |        `- error: no such module 'UIKit'
10 |
11 | ///	Protocol to define what is required for an object to be Coordinator.
[7/7] Compiling Coordinator Coordinating.swift
/Users/admin/builder/spi-builder-workspace/Sources/Coordinator/Coordinating.swift:9:8: error: no such module 'UIKit'
 7 | //
 8 |
 9 | import UIKit
   |        `- error: no such module 'UIKit'
10 |
11 | ///	Protocol to define what is required for an object to be Coordinator.
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-16.3.0.app xcrun swift build --arch arm64
[0/1] Planning build
Building for debugging...
[0/1] Write swift-version-2F0A5646E1D333AE.txt
error: emit-module command failed with exit code 1 (use -v to see invocation)
[2/6] Emitting module Coordinator
/Users/admin/builder/spi-builder-workspace/Sources/Coordinator/Coordinating.swift:9:8: error: no such module 'UIKit'
 7 | //
 8 |
 9 | import UIKit
   |        `- error: no such module 'UIKit'
10 |
11 | ///	Protocol to define what is required for an object to be Coordinator.
[3/6] Compiling Coordinator Coordinating.swift
/Users/admin/builder/spi-builder-workspace/Sources/Coordinator/Coordinating.swift:9:8: error: no such module 'UIKit'
 7 | //
 8 |
 9 | import UIKit
   |        `- error: no such module 'UIKit'
10 |
11 | ///	Protocol to define what is required for an object to be Coordinator.
[4/6] Compiling Coordinator UIKit-CoordinatingExtensions.swift
/Users/admin/builder/spi-builder-workspace/Sources/Coordinator/Coordinating.swift:9:8: error: no such module 'UIKit'
 7 | //
 8 |
 9 | import UIKit
   |        `- error: no such module 'UIKit'
10 |
11 | ///	Protocol to define what is required for an object to be Coordinator.
[5/6] Compiling Coordinator Coordinator.swift
/Users/admin/builder/spi-builder-workspace/Sources/Coordinator/Coordinating.swift:9:8: error: no such module 'UIKit'
 7 | //
 8 |
 9 | import UIKit
   |        `- error: no such module 'UIKit'
10 |
11 | ///	Protocol to define what is required for an object to be Coordinator.
[6/6] Compiling Coordinator NavigationCoordinator.swift
/Users/admin/builder/spi-builder-workspace/Sources/Coordinator/Coordinating.swift:9:8: error: no such module 'UIKit'
 7 | //
 8 |
 9 | import UIKit
   |        `- error: no such module 'UIKit'
10 |
11 | ///	Protocol to define what is required for an object to be Coordinator.
BUILD FAILURE 6.1 macosSpm