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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 RSTabBar with Swift 5.9 for macOS (SPM).

Build Command

env DEVELOPER_DIR=/Applications/Xcode-15.2.0.app xcrun swift build --arch arm64

Build Log

========================================
RunAll
========================================
Builder version: 4.38.0
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/RanduSoft/RSTabBar.git
Reference: master
Initialized empty Git repository in /Users/builder/builds/TDmZkXJm/0/finestructure/swiftpackageindex-builder/spi-builder-workspace/.git/
From https://github.com/RanduSoft/RSTabBar
 * branch            master     -> FETCH_HEAD
 * [new branch]      master     -> origin/master
HEAD is now at 31d766d Update README.md
Cloned https://github.com/RanduSoft/RSTabBar.git
Revision (git rev-parse @):
31d766dc6206f0f313bf8041252ab6471b2d8ca7
SUCCESS checkout https://github.com/RanduSoft/RSTabBar.git at master
========================================
Build
========================================
Selected platform:         macosSpm
Swift version:             5.9
Building package at path:  $workDir
https://github.com/RanduSoft/RSTabBar.git
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-15.2.0.app xcrun swift build --arch arm64
Building for debugging...
error: emit-module command failed with exit code 1 (use -v to see invocation)
[1/4] Emitting module RSTabBar
/Users/builder/builds/TDmZkXJm/0/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/TabItem.swift:7:8: error: no such module 'UIKit'
import UIKit
       ^
[2/4] Compiling RSTabBar RSTabBar.swift
/Users/builder/builds/TDmZkXJm/0/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/TabItem.swift:7:8: error: no such module 'UIKit'
import UIKit
       ^
[3/4] Compiling RSTabBar TabItem.swift
/Users/builder/builds/TDmZkXJm/0/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/TabItem.swift:7:8: error: no such module 'UIKit'
import UIKit
       ^
[4/4] Compiling RSTabBar TabItemView.swift
/Users/builder/builds/TDmZkXJm/0/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/TabItem.swift:7:8: error: no such module 'UIKit'
import UIKit
       ^
error: fatalError
[0/1] Planning build
Building for debugging...
error: emit-module command failed with exit code 1 (use -v to see invocation)
[1/4] Emitting module RSTabBar
/Users/builder/builds/TDmZkXJm/0/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/TabItem.swift:7:8: error: no such module 'UIKit'
import UIKit
       ^
[2/4] Compiling RSTabBar RSTabBar.swift
/Users/builder/builds/TDmZkXJm/0/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/TabItem.swift:7:8: error: no such module 'UIKit'
import UIKit
       ^
[3/4] Compiling RSTabBar TabItemView.swift
/Users/builder/builds/TDmZkXJm/0/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/TabItem.swift:7:8: error: no such module 'UIKit'
import UIKit
       ^
[4/4] Compiling RSTabBar TabItem.swift
/Users/builder/builds/TDmZkXJm/0/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/TabItem.swift:7:8: error: no such module 'UIKit'
import UIKit
       ^
error: fatalError
BUILD FAILURE 5.9 macosSpm