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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 Observation with Swift 5.9 for macOS (SPM).

Build Command

env DEVELOPER_DIR=/Applications/Xcode-15.0.0.app xcrun swift build --arch arm64

Build Log

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RunAll
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Builder version: 4.22.3
Interrupt handler set up.
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Checkout
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Clone URL: https://github.com/0xLet/Observation.git
Reference: main
Initialized empty Git repository in /Users/builder/builds/TDmZkXJm/0/finestructure/swiftpackageindex-builder/spi-builder-workspace/.git/
From https://github.com/0xLet/Observation
 * branch            main       -> FETCH_HEAD
 * [new branch]      main       -> origin/main
HEAD is now at 9e04c70 Merge pull request #2 from 0xLeif/develop
Cloned https://github.com/0xLet/Observation.git into /Users/builder/builds/TDmZkXJm/0/finestructure/swiftpackageindex-builder/spi-builder-workspace
Revision (git rev-parse @):
9e04c7056782c73a8f2ad6cea43f71a1c5a9700b
SUCCESS checkout https://github.com/0xLet/Observation.git at main
========================================
Build
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Selected platform:         macosSpm
Swift version:             5.9
Building package at path:  /Users/builder/builds/TDmZkXJm/0/finestructure/swiftpackageindex-builder/spi-builder-workspace
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-15.0.0.app xcrun swift build --arch arm64
Building for debugging...
[1/5] Compiling E Function.swift
[2/5] Compiling E Control.swift
[3/5] Compiling E State.swift
[4/5] Emitting module E
[5/5] Compiling E Variable.swift
[6/7] Compiling Chain Chain.swift
[7/7] Emitting module Chain
error: emit-module command failed with exit code 1 (use -v to see invocation)
[8/9] Emitting module Observation
<unknown>:0: error: circular dependency between modules 'Observation' and 'Foundation'
[9/9] Compiling Observation ObservedValue.swift
<unknown>:0: error: circular dependency between modules 'Observation' and 'Foundation'
error: fatalError
Fetching https://github.com/0xLeif/Chain from cache
Fetching https://github.com/0xLeif/E.num from cache
Fetched https://github.com/0xLeif/Chain (0.19s)
Fetched https://github.com/0xLeif/E.num (0.19s)
Computing version for https://github.com/0xLeif/Chain
Computed https://github.com/0xLeif/Chain at 0.2.0 (0.46s)
Computing version for https://github.com/0xLeif/E.num
Computed https://github.com/0xLeif/E.num at 0.3.0 (0.43s)
Creating working copy for https://github.com/0xLeif/E.num
Working copy of https://github.com/0xLeif/E.num resolved at 0.3.0
Creating working copy for https://github.com/0xLeif/Chain
Working copy of https://github.com/0xLeif/Chain resolved at 0.2.0
[0/1] Planning build
Building for debugging...
error: emit-module command failed with exit code 1 (use -v to see invocation)
[1/2] Emitting module Observation
<unknown>:0: error: circular dependency between modules 'Observation' and 'Foundation'
[2/2] Compiling Observation ObservedValue.swift
<unknown>:0: error: circular dependency between modules 'Observation' and 'Foundation'
error: fatalError
BUILD FAILURE 5.9 macosSpm
This is a staging environment. For live and up-to-date package information, visit swiftpackageindex.com.