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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 RVS_Checkbox, reference main (954368), with Swift 5.9 for macOS (SPM) on 20 Apr 2025 16:34:10 UTC.

Build Command

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

Build Log

========================================
RunAll
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Builder version: 4.60.1
Interrupt handler set up.
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Checkout
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Clone URL: https://github.com/RiftValleySoftware/RVS_Checkbox.git
Reference: main
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/RiftValleySoftware/RVS_Checkbox
 * branch            main       -> FETCH_HEAD
 * [new branch]      main       -> origin/main
HEAD is now at 954368b Added a note about dragging in a UISwitch.
Cloned https://github.com/RiftValleySoftware/RVS_Checkbox.git
Revision (git rev-parse @):
954368b42998b396851efdd7f4fbf595fd5c9cc1
SUCCESS checkout https://github.com/RiftValleySoftware/RVS_Checkbox.git at main
========================================
Build
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Selected platform:         macosSpm
Swift version:             5.9
Building package at path:  $PWD
https://github.com/RiftValleySoftware/RVS_Checkbox.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)
[1/2] Emitting module RVS_Checkbox
/Users/admin/builder/spi-builder-workspace/Sources/RVS_Checkbox/RVS_Checkbox.swift:25:8: error: no such module 'UIKit'
import UIKit
       ^
[2/2] Compiling RVS_Checkbox RVS_Checkbox.swift
/Users/admin/builder/spi-builder-workspace/Sources/RVS_Checkbox/RVS_Checkbox.swift:25:8: error: no such module 'UIKit'
import UIKit
       ^
error: fatalError
BUILD FAILURE 5.9 macosSpm