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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 Arrows, reference 1.0.0 (9b3ca0), with Swift 6.1 for macOS (SPM) on 24 Apr 2025 13:10:09 UTC.

Build Command

env DEVELOPER_DIR=/Applications/Xcode-16.3.0.app xcrun swift build --arch arm64

Build Log

========================================
RunAll
========================================
Builder version: 4.61.0
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/antoniocasero/Arrows.git
Reference: 1.0.0
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/antoniocasero/Arrows
 * tag               1.0.0      -> FETCH_HEAD
HEAD is now at 9b3ca05 Clean up
Cloned https://github.com/antoniocasero/Arrows.git
Revision (git rev-parse @):
9b3ca05ee2e7a485a09780a14c8bcf10706ce6eb
SUCCESS checkout https://github.com/antoniocasero/Arrows.git at 1.0.0
========================================
ResolveProductDependencies
========================================
Resolving dependencies ...
Fetching https://github.com/antoniocasero/Arrows.git
[1/183] Fetching arrows
Fetched https://github.com/antoniocasero/Arrows.git from cache (0.99s)
Creating working copy for https://github.com/antoniocasero/Arrows.git
Working copy of https://github.com/antoniocasero/Arrows.git resolved at 1.0.0 (9b3ca05)
error: 'arrows': Source files for target Arrows should be located under 'Sources/Arrows', or a custom sources path can be set with the 'path' property in Package.swift
========================================
Build
========================================
Selected platform:         macosSpm
Swift version:             6.1
Building package at path:  $PWD
https://github.com/antoniocasero/Arrows.git
https://github.com/antoniocasero/Arrows.git
error: Source files for target Arrows should be located under 'Sources/Arrows', or a custom sources path can be set with the 'path' property in Package.swift
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-16.3.0.app xcrun swift build --arch arm64 -Xswiftc -Xfrontend -Xswiftc -stats-output-dir -Xswiftc -Xfrontend -Xswiftc .stats -Xswiftc -strict-concurrency=complete -Xswiftc -enable-upcoming-feature -Xswiftc StrictConcurrency -Xswiftc -enable-upcoming-feature -Xswiftc DisableOutwardActorInference -Xswiftc -enable-upcoming-feature -Xswiftc GlobalActorIsolatedTypesUsability -Xswiftc -enable-upcoming-feature -Xswiftc InferSendableFromCaptures
error: 'spi-builder-workspace': Source files for target Arrows should be located under 'Sources/Arrows', or a custom sources path can be set with the 'path' property in Package.swift
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-16.3.0.app xcrun swift build --arch arm64
error: 'spi-builder-workspace': Source files for target Arrows should be located under 'Sources/Arrows', or a custom sources path can be set with the 'path' property in Package.swift
BUILD FAILURE 6.1 macosSpm