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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 RotatingLabel 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/raymondjavaxx/RotatingLabel.git
Reference: main
Initialized empty Git repository in /Users/builder/builds/TDmZkXJm/0/finestructure/swiftpackageindex-builder/spi-builder-workspace/.git/
From https://github.com/raymondjavaxx/RotatingLabel
 * branch            main       -> FETCH_HEAD
 * [new branch]      main       -> origin/main
HEAD is now at 9df7745 Docs fix (#17)
Cloned https://github.com/raymondjavaxx/RotatingLabel.git
Revision (git rev-parse @):
9df77451b8013ea168115fb0a587695dd17ea6cc
SPI manifest file found: $workDir/.spi.yml
SUCCESS checkout https://github.com/raymondjavaxx/RotatingLabel.git at main
========================================
Build
========================================
Selected platform:         macosSpm
Swift version:             5.10
Building package at path:  $workDir
https://github.com/raymondjavaxx/RotatingLabel.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)
[3/5] Emitting module RotatingLabel
/Users/builder/builds/TDmZkXJm/0/finestructure/swiftpackageindex-builder/spi-builder-workspace/RotatingLabel/RotatingLabel.swift:8:8: error: no such module 'UIKit'
import UIKit
       ^
[4/5] Compiling RotatingLabel RotatingLabel.swift
/Users/builder/builds/TDmZkXJm/0/finestructure/swiftpackageindex-builder/spi-builder-workspace/RotatingLabel/RotatingLabel.swift:8:8: error: no such module 'UIKit'
import UIKit
       ^
[5/5] Compiling RotatingLabel DiffingFunction.swift
/Users/builder/builds/TDmZkXJm/0/finestructure/swiftpackageindex-builder/spi-builder-workspace/RotatingLabel/RotatingLabel.swift:8:8: 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)
[2/4] Emitting module RotatingLabel
/Users/builder/builds/TDmZkXJm/0/finestructure/swiftpackageindex-builder/spi-builder-workspace/RotatingLabel/RotatingLabel.swift:8:8: error: no such module 'UIKit'
import UIKit
       ^
[3/4] Compiling RotatingLabel RotatingLabel.swift
/Users/builder/builds/TDmZkXJm/0/finestructure/swiftpackageindex-builder/spi-builder-workspace/RotatingLabel/RotatingLabel.swift:8:8: error: no such module 'UIKit'
import UIKit
       ^
[4/4] Compiling RotatingLabel DiffingFunction.swift
/Users/builder/builds/TDmZkXJm/0/finestructure/swiftpackageindex-builder/spi-builder-workspace/RotatingLabel/RotatingLabel.swift:8:8: error: no such module 'UIKit'
import UIKit
       ^
error: fatalError
BUILD FAILURE 5.10 macosSpm