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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 swift-sass, reference main (66d548), with Swift 5.10 for macOS (SPM) on 30 Apr 2025 11:41:16 UTC.

Build Command

env DEVELOPER_DIR=/Applications/Xcode-15.4.0.app xcrun swift build --arch arm64

Build Log

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RunAll
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Builder version: 4.61.1
Interrupt handler set up.
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Checkout
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Clone URL: https://github.com/johnfairh/swift-sass.git
Reference: main
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/johnfairh/swift-sass
 * branch            main       -> FETCH_HEAD
 * [new branch]      main       -> origin/main
HEAD is now at 66d548f Update to Sass 1.87.0 (#45)
Submodule path 'sass': checked out 'a3ca9ed36f1aaf88a60b3f1f726691aec2a0ffa2'
Submodule 'sass' (https://github.com/sass/sass.git) registered for path 'sass'
Cloning into '/Users/admin/builder/spi-builder-workspace/sass'...
Cloned https://github.com/johnfairh/swift-sass.git
Revision (git rev-parse @):
66d548f15eb280f3228ac50d6ed17ba59e196b3c
SUCCESS checkout https://github.com/johnfairh/swift-sass.git at main
========================================
Build
========================================
Selected platform:         macosSpm
Swift version:             5.10
Building package at path:  $PWD
https://github.com/johnfairh/swift-sass.git
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-15.4.0.app xcrun swift build --arch arm64
error: 'spi-builder-workspace': package 'spi-builder-workspace' is using Swift tools version 6.0.0 but the installed version is 5.10.0
BUILD FAILURE 5.10 macosSpm