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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 SquirrelToolBox with Swift 6.0 for macOS (SPM).

Build Command

env DEVELOPER_DIR=/Applications/Xcode-15.3.0.app xcrun --toolchain org.swift.600202405261a swift build --arch arm64 -Xswiftc -Xfrontend -Xswiftc -stats-output-dir -Xswiftc -Xfrontend -Xswiftc .stats -Xswiftc -strict-concurrency=complete

Build Log

========================================
RunAll
========================================
Builder version: 4.40.0
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/swift-squirrel/squirrel-toolbox.git
Reference: master
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/swift-squirrel/squirrel-toolbox
 * branch            master     -> FETCH_HEAD
 * [new branch]      master     -> origin/master
HEAD is now at de95bb1 Develop (#2)
Cloned https://github.com/swift-squirrel/squirrel-toolbox.git
Revision (git rev-parse @):
de95bb10df90749ca6ad30c33248b9e2e6ed4178
SUCCESS checkout https://github.com/swift-squirrel/squirrel-toolbox.git at master
========================================
Build
========================================
Selected platform:         macosSpm
Swift version:             6.0
Building package at path:  $workDir
https://github.com/swift-squirrel/squirrel-toolbox.git
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-15.3.0.app xcrun --toolchain org.swift.600202405261a swift build --arch arm64 -Xswiftc -Xfrontend -Xswiftc -stats-output-dir -Xswiftc -Xfrontend -Xswiftc .stats -Xswiftc -strict-concurrency=complete
Fetching https://github.com/IBM-Swift/BlueSignals
Fetching https://github.com/jakeheis/SwiftCLI
Fetching https://github.com/kylef/PathKit.git
[1/1411] Fetching pathkit
[100/6485] Fetching pathkit, swiftcli
[402/7139] Fetching pathkit, swiftcli, bluesignals
Fetched https://github.com/jakeheis/SwiftCLI from cache (1.25s)
Fetched https://github.com/IBM-Swift/BlueSignals from cache (1.25s)
Fetched https://github.com/kylef/PathKit.git from cache (1.25s)
Computing version for https://github.com/kylef/PathKit.git
Computed https://github.com/kylef/PathKit.git at 0.9.2 (2.29s)
Fetching https://github.com/kylef/Spectre.git
[1/1021] Fetching spectre
Fetched https://github.com/kylef/Spectre.git from cache (0.96s)
Computing version for https://github.com/kylef/Spectre.git
Computed https://github.com/kylef/Spectre.git at 0.9.2 (0.72s)
Computing version for https://github.com/jakeheis/SwiftCLI
Computed https://github.com/jakeheis/SwiftCLI at 3.1.0 (0.64s)
Computing version for https://github.com/IBM-Swift/BlueSignals
error: the Swift tools version specification is missing a label; consider inserting 'swift-tools-version:' between the comment marker and the version specifier
BUILD FAILURE 6.0 macosSpm
This is a staging environment. For live and up-to-date package information, visit swiftpackageindex.com.