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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 SwiftCron with Swift 5.10 for watchOS using Xcode 15.4.

Build Command

Build command unavailable

Build Log

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RunAll
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Builder version: 4.29.0
Interrupt handler set up.
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Checkout
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Clone URL: https://github.com/rymcol/swiftcron.git
Reference: 0.2.0
Initialized empty Git repository in /Users/admin/builds/J1XnyXFH/0/finestructure/swiftpackageindex-builder/spi-builder-workspace/.git/
From https://github.com/rymcol/swiftcron
 * tag               0.2.0      -> FETCH_HEAD
HEAD is now at 5efa3b2 Merge pull request #2 from rymcol/swift-4
Cloned https://github.com/rymcol/swiftcron.git
Revision (git rev-parse @):
5efa3b2a52274fdb670d9ac739c9ee3b3a8c1618
SUCCESS checkout https://github.com/rymcol/swiftcron.git at 0.2.0
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Build
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Selected platform:         watchOS
Swift version:             5.10
Building package at path:  $workDir
https://github.com/rymcol/swiftcron.git
Command line invocation:
    /Applications/Xcode-15.3.0-Beta.2.app/Contents/Developer/usr/bin/xcodebuild -IDEClonedSourcePackagesDirPathOverride=/Users/admin/builds/J1XnyXFH/0/finestructure/swiftpackageindex-builder/spi-builder-workspace/.dependencies -resolvePackageDependencies
User defaults from command line:
    IDEClonedSourcePackagesDirPathOverride = /Users/admin/builds/J1XnyXFH/0/finestructure/swiftpackageindex-builder/spi-builder-workspace/.dependencies
    IDEPackageSupportUseBuiltinSCM = YES
Resolve Package Graph
Fetching from https://github.com/PerfectlySoft/Perfect-Thread.git (cached)
the Swift tools version specification is missing a label; consider inserting 'swift-tools-version:' between the comment marker and the version specifier
Resolved source packages:
  SwiftCron: /Users/admin/builds/J1XnyXFH/0/finestructure/swiftpackageindex-builder/spi-builder-workspace
Resolve Package Graph
Updating from https://github.com/PerfectlySoft/Perfect-Thread.git
the Swift tools version specification is missing a label; consider inserting 'swift-tools-version:' between the comment marker and the version specifier
2024-02-14 14:54:33.701 xcodebuild[41039:8759883] Requested but did not find extension point with identifier Xcode.DVTDeviceFoundation.Aspect for extension Xcode.IDEiOSSupportCore.Aspect.NBDD of plug-in com.apple.dt.IDE.IDEiOSSupportCore
2024-02-14 14:54:34.912 xcodebuild[41039:8759883] Writing error result bundle to /var/folders/c2/b2kmn__12wq57m82ltz0hl1w0000gn/T/ResultBundle_2024-14-02_14-54-0034.xcresult
2024-02-14 14:54:35.002 xcodebuild[41039:8759883] [MT] DVTPlugInQuery: Requested but did not find extension point with identifier 'Xcode.DVTDeviceFoundation.CompatibleDeviceFamilyPair'. This is programmer error; code should only request extension points that are defined by itself or its dependencies.
xcodebuild: error: Could not resolve package dependencies:
  the Swift tools version specification is missing a label; consider inserting 'swift-tools-version:' between the comment marker and the version specifier
GENERIC FAILURE 5.10 watchOS