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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 WWPerpetualCalendar 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: 4.34.1
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/William-Weng/WWPerpetualCalendar.git
Reference: 1.0.4
Initialized empty Git repository in /Users/builder/builds/UKfvDsi8u/2/finestructure/swiftpackageindex-builder/spi-builder-workspace/.git/
From https://github.com/William-Weng/WWPerpetualCalendar
 * tag               1.0.4      -> FETCH_HEAD
HEAD is now at afade54 - fix import error
Cloned https://github.com/William-Weng/WWPerpetualCalendar.git
Revision (git rev-parse @):
afade546c8af5ddb3393013b610ced1d4600e1b5
SUCCESS checkout https://github.com/William-Weng/WWPerpetualCalendar.git at 1.0.4
========================================
Build
========================================
Selected platform:         macosSpm
Swift version:             5.9
Building package at path:  $workDir
https://github.com/William-Weng/WWPerpetualCalendar.git
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-15.2.0.app xcrun swift build --arch arm64
Building for debugging...
[0/3] Copying Package.storyboard
[1/3] Copying Privacy
error: emit-module command failed with exit code 1 (use -v to see invocation)
[4/8] Emitting module WWOnBoardingViewController
/Users/builder/builds/UKfvDsi8u/2/finestructure/swiftpackageindex-builder/spi-builder-workspace/.build/checkouts/WWOnBoardingViewController/Sources/WWOnBoardingViewController/Extension.swift:8:8: error: no such module 'UIKit'
import UIKit
       ^
[5/8] Compiling WWOnBoardingViewController resource_bundle_accessor.swift
/Users/builder/builds/UKfvDsi8u/2/finestructure/swiftpackageindex-builder/spi-builder-workspace/.build/checkouts/WWOnBoardingViewController/Sources/WWOnBoardingViewController/Extension.swift:8:8: error: no such module 'UIKit'
import UIKit
       ^
[6/8] Compiling WWOnBoardingViewController WWOnBoardingViewController.swift
/Users/builder/builds/UKfvDsi8u/2/finestructure/swiftpackageindex-builder/spi-builder-workspace/.build/checkouts/WWOnBoardingViewController/Sources/WWOnBoardingViewController/Extension.swift:8:8: error: no such module 'UIKit'
import UIKit
       ^
[7/8] Compiling WWOnBoardingViewController Extension.swift
/Users/builder/builds/UKfvDsi8u/2/finestructure/swiftpackageindex-builder/spi-builder-workspace/.build/checkouts/WWOnBoardingViewController/Sources/WWOnBoardingViewController/Extension.swift:8:8: error: no such module 'UIKit'
import UIKit
       ^
[8/8] Compiling WWOnBoardingViewController Protocol.swift
/Users/builder/builds/UKfvDsi8u/2/finestructure/swiftpackageindex-builder/spi-builder-workspace/.build/checkouts/WWOnBoardingViewController/Sources/WWOnBoardingViewController/Extension.swift:8:8: error: no such module 'UIKit'
import UIKit
       ^
error: fatalError
Fetching https://github.com/William-Weng/WWOnBoardingViewController.git from cache
Fetched https://github.com/William-Weng/WWOnBoardingViewController.git (0.19s)
Computing version for https://github.com/William-Weng/WWOnBoardingViewController.git
Computed https://github.com/William-Weng/WWOnBoardingViewController.git at 1.3.2 (0.40s)
Creating working copy for https://github.com/William-Weng/WWOnBoardingViewController.git
Working copy of https://github.com/William-Weng/WWOnBoardingViewController.git resolved at 1.3.2
[0/1] Planning build
Building for debugging...
[1/5] Compiling WWOnBoardingViewController resource_bundle_accessor.swift
/Users/builder/builds/UKfvDsi8u/2/finestructure/swiftpackageindex-builder/spi-builder-workspace/.build/checkouts/WWOnBoardingViewController/Sources/WWOnBoardingViewController/Extension.swift:8:8: error: no such module 'UIKit'
import UIKit
       ^
[2/5] Compiling WWOnBoardingViewController Extension.swift
/Users/builder/builds/UKfvDsi8u/2/finestructure/swiftpackageindex-builder/spi-builder-workspace/.build/checkouts/WWOnBoardingViewController/Sources/WWOnBoardingViewController/Extension.swift:8:8: error: no such module 'UIKit'
import UIKit
       ^
error: emit-module command failed with exit code 1 (use -v to see invocation)
[3/5] Emitting module WWOnBoardingViewController
/Users/builder/builds/UKfvDsi8u/2/finestructure/swiftpackageindex-builder/spi-builder-workspace/.build/checkouts/WWOnBoardingViewController/Sources/WWOnBoardingViewController/Extension.swift:8:8: error: no such module 'UIKit'
import UIKit
       ^
[4/5] Compiling WWOnBoardingViewController Protocol.swift
/Users/builder/builds/UKfvDsi8u/2/finestructure/swiftpackageindex-builder/spi-builder-workspace/.build/checkouts/WWOnBoardingViewController/Sources/WWOnBoardingViewController/Extension.swift:8:8: error: no such module 'UIKit'
import UIKit
       ^
[5/5] Compiling WWOnBoardingViewController WWOnBoardingViewController.swift
/Users/builder/builds/UKfvDsi8u/2/finestructure/swiftpackageindex-builder/spi-builder-workspace/.build/checkouts/WWOnBoardingViewController/Sources/WWOnBoardingViewController/Extension.swift:8:8: error: no such module 'UIKit'
import UIKit
       ^
error: fatalError
BUILD FAILURE 5.9 macosSpm

Build Machine: Mac 7