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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 EFCountingLabel with Swift 5.10 for macOS (SPM).

Build Command

env DEVELOPER_DIR=/Applications/Xcode-15.3.0-Beta.2.app xcrun swift build --arch arm64

Build Log

========================================
RunAll
========================================
Builder version: 4.29.0
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/EFPrefix/EFCountingLabel.git
Reference: master
Initialized empty Git repository in /Users/builder/builds/UKfvDsi8u/0/finestructure/swiftpackageindex-builder/spi-builder-workspace/.git/
From https://github.com/EFPrefix/EFCountingLabel
 * branch            master     -> FETCH_HEAD
 * [new branch]      master     -> origin/master
HEAD is now at 495d813 fix
Cloned https://github.com/EFPrefix/EFCountingLabel.git
Revision (git rev-parse @):
495d813050a41a7e96943ffb80186577293aa832
SUCCESS checkout https://github.com/EFPrefix/EFCountingLabel.git at master
========================================
Build
========================================
Selected platform:         macosSpm
Swift version:             5.10
Building package at path:  $workDir
https://github.com/EFPrefix/EFCountingLabel.git
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-15.3.0-Beta.2.app xcrun swift build --arch arm64
Building for debugging...
[0/2] Write sources
[1/2] Write swift-version--423B1241ED78D482.txt
[3/6] Compiling EFCountingLabel EFCountAdapter.swift
/Users/builder/builds/UKfvDsi8u/0/finestructure/swiftpackageindex-builder/spi-builder-workspace/EFCountingLabel/EFCountAdapter.swift:27:8: error: no such module 'UIKit'
import UIKit
       ^
[4/6] Compiling EFCountingLabel EFTimingMethod.swift
/Users/builder/builds/UKfvDsi8u/0/finestructure/swiftpackageindex-builder/spi-builder-workspace/EFCountingLabel/EFCountAdapter.swift:27:8: error: no such module 'UIKit'
import UIKit
       ^
error: emit-module command failed with exit code 1 (use -v to see invocation)
[5/6] Emitting module EFCountingLabel
/Users/builder/builds/UKfvDsi8u/0/finestructure/swiftpackageindex-builder/spi-builder-workspace/EFCountingLabel/EFCountAdapter.swift:27:8: error: no such module 'UIKit'
import UIKit
       ^
[6/6] Compiling EFCountingLabel EFCount.swift
/Users/builder/builds/UKfvDsi8u/0/finestructure/swiftpackageindex-builder/spi-builder-workspace/EFCountingLabel/EFCountAdapter.swift:27:8: error: no such module 'UIKit'
import UIKit
       ^
error: fatalError
[0/1] Planning build
Building for debugging...
[0/1] Write swift-version--423B1241ED78D482.txt
error: emit-module command failed with exit code 1 (use -v to see invocation)
[2/5] Emitting module EFCountingLabel
/Users/builder/builds/UKfvDsi8u/0/finestructure/swiftpackageindex-builder/spi-builder-workspace/EFCountingLabel/EFCountAdapter.swift:27:8: error: no such module 'UIKit'
import UIKit
       ^
[3/5] Compiling EFCountingLabel EFTimingMethod.swift
/Users/builder/builds/UKfvDsi8u/0/finestructure/swiftpackageindex-builder/spi-builder-workspace/EFCountingLabel/EFCountAdapter.swift:27:8: error: no such module 'UIKit'
import UIKit
       ^
[4/5] Compiling EFCountingLabel EFCountAdapter.swift
/Users/builder/builds/UKfvDsi8u/0/finestructure/swiftpackageindex-builder/spi-builder-workspace/EFCountingLabel/EFCountAdapter.swift:27:8: error: no such module 'UIKit'
import UIKit
       ^
[5/5] Compiling EFCountingLabel EFCount.swift
/Users/builder/builds/UKfvDsi8u/0/finestructure/swiftpackageindex-builder/spi-builder-workspace/EFCountingLabel/EFCountAdapter.swift:27:8: error: no such module 'UIKit'
import UIKit
       ^
error: fatalError
BUILD FAILURE 5.10 macosSpm