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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.
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Checkout
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Clone URL: https://github.com/RanduSoft/RSTabBar.git
Reference: v1.1.1
Initialized empty Git repository in /Users/builder/builds/UKfvDsi8u/2/finestructure/swiftpackageindex-builder/spi-builder-workspace/.git/
From https://github.com/RanduSoft/RSTabBar
 * tag               v1.1.1     -> FETCH_HEAD
HEAD is now at 0b31b88 - fixed TabBar position when the keyboard is open
Cloned https://github.com/RanduSoft/RSTabBar.git
Revision (git rev-parse @):
0b31b881d222de4016e71a90f5c1058e143ff1ed
SUCCESS checkout https://github.com/RanduSoft/RSTabBar.git at v1.1.1
========================================
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/UKfvDsi8u/2/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/TabItem.swift:7:8: error: no such module 'UIKit'
import UIKit
       ^
[2/4] Compiling RSTabBar TabItem.swift
/Users/builder/builds/UKfvDsi8u/2/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/TabItem.swift:7:8: error: no such module 'UIKit'
import UIKit
       ^
[3/4] Compiling RSTabBar RSTabBar.swift
/Users/builder/builds/UKfvDsi8u/2/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/UKfvDsi8u/2/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/UKfvDsi8u/2/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/UKfvDsi8u/2/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/UKfvDsi8u/2/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/UKfvDsi8u/2/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

Build Machine: Mac 7