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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 Twinkle 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/piemonte/Twinkle.git
Reference: main
Initialized empty Git repository in /Users/admin/builds/J1XnyXFH/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/.git/
From https://github.com/piemonte/Twinkle
 * branch            main       -> FETCH_HEAD
 * [new branch]      main       -> origin/main
HEAD is now at 43e18ca Update Package.swift
Cloned https://github.com/piemonte/Twinkle.git
Revision (git rev-parse @):
43e18ca26bb092b098a5ae5ae01973e26fd3e268
SUCCESS checkout https://github.com/piemonte/Twinkle.git at main
========================================
Build
========================================
Selected platform:         macosSpm
Swift version:             5.10
Building package at path:  $workDir
https://github.com/piemonte/Twinkle.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)
[3/4] Emitting module Twinkle
/Users/admin/builds/J1XnyXFH/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Twinkle.swift:28:8: error: no such module 'UIKit'
import UIKit
       ^
[4/4] Compiling Twinkle Twinkle.swift
/Users/admin/builds/J1XnyXFH/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Twinkle.swift:28:8: 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)
[2/3] Emitting module Twinkle
/Users/admin/builds/J1XnyXFH/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Twinkle.swift:28:8: error: no such module 'UIKit'
import UIKit
       ^
[3/3] Compiling Twinkle Twinkle.swift
/Users/admin/builds/J1XnyXFH/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Twinkle.swift:28:8: error: no such module 'UIKit'
import UIKit
       ^
error: fatalError
BUILD FAILURE 5.10 macosSpm