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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 java_swift with Swift 5.9 for macOS (SPM).

Build Command

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

Build Log

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RunAll
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Builder version: 4.28.5
Interrupt handler set up.
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Checkout
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Clone URL: https://github.com/PureSwift/java_swift.git
Reference: 2.4.0
Initialized empty Git repository in /Users/builder/builds/TDmZkXJm/3/finestructure/swiftpackageindex-builder/spi-builder-workspace/.git/
From https://github.com/PureSwift/java_swift
 * tag               2.4.0      -> FETCH_HEAD
HEAD is now at 6172ff6 Swift 4.2/5
Cloned https://github.com/PureSwift/java_swift.git
Revision (git rev-parse @):
6172ff68d6fc575f3f4b9adc2bc8e1362f1b1dd9
SUCCESS checkout https://github.com/PureSwift/java_swift.git at 2.4.0
error: 'spi-builder-workspace': the Swift tools version specification is missing a label; consider inserting 'swift-tools-version:' between the comment marker and the version specifier
========================================
Build
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Selected platform:         macosSpm
Swift version:             5.9
Building package at path:  $PWD/checkout
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-15.2.0-Beta.app xcrun swift build --arch arm64
error: 'spi-builder-workspace': the Swift tools version specification is missing a label; consider inserting 'swift-tools-version:' between the comment marker and the version specifier
error: 'spi-builder-workspace': the Swift tools version specification is missing a label; consider inserting 'swift-tools-version:' between the comment marker and the version specifier
BUILD FAILURE 5.9 macosSpm