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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_lang with Swift 6.0 for watchOS using Xcode 16.0.

Build Command

Build command unavailable

Build Log

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RunAll
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Builder version: 4.56.0
Interrupt handler set up.
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Checkout
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Clone URL: https://github.com/PureSwift/java_lang.git
Reference: 2.4.0
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/PureSwift/java_lang
 * tag               2.4.0      -> FETCH_HEAD
HEAD is now at 2617a20 Swift 4.2/5
Cloned https://github.com/PureSwift/java_lang.git
Revision (git rev-parse @):
2617a2065e53fe0a1cf1151d3ccf40a435a3eeb8
SUCCESS checkout https://github.com/PureSwift/java_lang.git at 2.4.0
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Build
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Selected platform:         watchOS
Swift version:             6.0
Building package at path:  $PWD
https://github.com/PureSwift/java_lang.git
Command line invocation:
    /Applications/Xcode-16.1.0.app/Contents/Developer/usr/bin/xcodebuild -IDEClonedSourcePackagesDirPathOverride=/Users/admin/builder/spi-builder-workspace/.dependencies -resolvePackageDependencies
User defaults from command line:
    IDEClonedSourcePackagesDirPathOverride = /Users/admin/builder/spi-builder-workspace/.dependencies
    IDEPackageSupportUseBuiltinSCM = YES
resolved source packages:
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: fatalError
GENERIC FAILURE 6.0 watchOS