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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 GraduatedSlider 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/sardon/GraduatedSlider.git
Reference: main
Initialized empty Git repository in /Users/builder/builds/UKfvDsi8u/0/finestructure/swiftpackageindex-builder/spi-builder-workspace/.git/
From https://github.com/sardon/GraduatedSlider
 * branch            main       -> FETCH_HEAD
 * [new branch]      main       -> origin/main
HEAD is now at 96bb177 .gitignore
Cloned https://github.com/sardon/GraduatedSlider.git
Revision (git rev-parse @):
96bb1779910bba078e6099de8b6b7e1e13cb7793
SUCCESS checkout https://github.com/sardon/GraduatedSlider.git at main
========================================
Build
========================================
Selected platform:         macosSpm
Swift version:             5.10
Building package at path:  $workDir
https://github.com/sardon/GraduatedSlider.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
error: emit-module command failed with exit code 1 (use -v to see invocation)
[3/7] Emitting module GraduatedSlider
/Users/builder/builds/UKfvDsi8u/0/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/GraduatedSlider/BackgroundLayer.swift:9:8: error: no such module 'UIKit'
import UIKit
       ^
[4/7] Compiling GraduatedSlider GraduatedSlider.swift
/Users/builder/builds/UKfvDsi8u/0/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/GraduatedSlider/BackgroundLayer.swift:9:8: error: no such module 'UIKit'
import UIKit
       ^
[5/7] Compiling GraduatedSlider BackgroundLayer.swift
/Users/builder/builds/UKfvDsi8u/0/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/GraduatedSlider/BackgroundLayer.swift:9:8: error: no such module 'UIKit'
import UIKit
       ^
[6/7] Compiling GraduatedSlider CGContext+Utils.swift
/Users/builder/builds/UKfvDsi8u/0/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/GraduatedSlider/BackgroundLayer.swift:9:8: error: no such module 'UIKit'
import UIKit
       ^
[7/7] Compiling GraduatedSlider CursorLayer.swift
/Users/builder/builds/UKfvDsi8u/0/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/GraduatedSlider/BackgroundLayer.swift:9:8: 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)
[2/6] Emitting module GraduatedSlider
/Users/builder/builds/UKfvDsi8u/0/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/GraduatedSlider/BackgroundLayer.swift:9:8: error: no such module 'UIKit'
import UIKit
       ^
[3/6] Compiling GraduatedSlider BackgroundLayer.swift
/Users/builder/builds/UKfvDsi8u/0/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/GraduatedSlider/BackgroundLayer.swift:9:8: error: no such module 'UIKit'
import UIKit
       ^
[4/6] Compiling GraduatedSlider CGContext+Utils.swift
/Users/builder/builds/UKfvDsi8u/0/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/GraduatedSlider/BackgroundLayer.swift:9:8: error: no such module 'UIKit'
import UIKit
       ^
[5/6] Compiling GraduatedSlider CursorLayer.swift
/Users/builder/builds/UKfvDsi8u/0/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/GraduatedSlider/BackgroundLayer.swift:9:8: error: no such module 'UIKit'
import UIKit
       ^
[6/6] Compiling GraduatedSlider GraduatedSlider.swift
/Users/builder/builds/UKfvDsi8u/0/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/GraduatedSlider/BackgroundLayer.swift:9:8: error: no such module 'UIKit'
import UIKit
       ^
error: fatalError
BUILD FAILURE 5.10 macosSpm