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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 MNISTKit 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: 4.56.0
Interrupt handler set up.
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Checkout
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Clone URL: https://github.com/cafielo/MNISTKit.git
Reference: 1.0.0
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/cafielo/MNISTKit
 * tag               1.0.0      -> FETCH_HEAD
HEAD is now at 2bf6804 Merge branch 'release/1.0.0'
Cloned https://github.com/cafielo/MNISTKit.git
Revision (git rev-parse @):
2bf6804b80f64c471970232b3b3aecdbe9224400
SUCCESS checkout https://github.com/cafielo/MNISTKit.git at 1.0.0
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Build
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Selected platform:         macosXcodebuild
Swift version:             6.0
Building package at path:  $PWD
https://github.com/cafielo/MNISTKit.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: Source files for target MNISTKit should be located under 'Sources/MNISTKit', or a custom sources path can be set with the 'path' property in Package.swift
GENERIC FAILURE 6.0 macosXcodebuild