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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 Usage with Swift 6.0 for macOS (Xcode) using Xcode 16.0.

Build Command

Build command unavailable

Build Log

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RunAll
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Builder version: 4.43.4
Interrupt handler set up.
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Checkout
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Clone URL: https://github.com/shogo4405/usage.git
Reference: 1.2.0
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
warning: templates not found in /usr/share/git-core/templates
From https://github.com/shogo4405/usage
 * tag               1.2.0      -> FETCH_HEAD
HEAD is now at 6df880e Bump to 1.2.0
Cloned https://github.com/shogo4405/usage.git
Revision (git rev-parse @):
6df880e65b4e2893babc982c06f57178dd95fa2c
SUCCESS checkout https://github.com/shogo4405/usage.git at 1.2.0
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Build
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Selected platform:         macosXcodebuild
Swift version:             6.0
Building package at path:  $workDir
https://github.com/shogo4405/usage.git
Command line invocation:
    /Applications/Xcode-16.0.0-Beta.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: Source files for target Usage should be located under 'Sources/Usage', or a custom sources path can be set with the 'path' property in Package.swift
GENERIC FAILURE 6.0 macosXcodebuild
This is a staging environment. For live and up-to-date package information, visit swiftpackageindex.com.