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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 BuildEnvironment, reference 1.0.0 (5f7dc4), with Swift 5.9 for macOS (SPM) on 10 Oct 2024 23:11:21 UTC.

Build Command

env DEVELOPER_DIR=/Applications/Xcode-15.2.0.app xcrun swift build --arch arm64

Build Log

========================================
RunAll
========================================
Builder version: 4.55.0
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/DimaRU/BuildEnvironment.git
Reference: 1.0.0
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/DimaRU/BuildEnvironment
 * tag               1.0.0      -> FETCH_HEAD
HEAD is now at 5f7dc4a Update README.md
Cloned https://github.com/DimaRU/BuildEnvironment.git
Revision (git rev-parse @):
5f7dc4a7f9bde8414764b8a342b091b2e987e674
SUCCESS checkout https://github.com/DimaRU/BuildEnvironment.git at 1.0.0
========================================
Build
========================================
Selected platform:         macosSpm
Swift version:             5.9
Building package at path:  $PWD
https://github.com/DimaRU/BuildEnvironment.git
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-15.2.0.app xcrun swift build --arch arm64
Building for debugging...
[1/6] Compiling BuildEnvGenerator stderror.swift
/Users/admin/builder/spi-builder-workspace/Sources/BuildEnvGenerator/stderror.swift:10:23: error: unknown attribute 'retroactive'
extension FileHandle: @retroactive TextOutputStream {
                      ^
/Users/admin/builder/spi-builder-workspace/Sources/BuildEnvGenerator/stderror.swift:10:1: error: inheritance from non-protocol type 'any TextOutputStream'
extension FileHandle: @retroactive TextOutputStream {
^
[2/6] Compiling BuildEnvGenerator GetArgument.swift
error: emit-module command failed with exit code 1 (use -v to see invocation)
[3/6] Compiling BuildEnvGenerator DictionaryExtensions.swift
[4/6] Compiling BuildEnvGenerator BuildEnvGenerator.swift
[5/6] Emitting module BuildEnvGenerator
/Users/admin/builder/spi-builder-workspace/Sources/BuildEnvGenerator/stderror.swift:10:23: error: unknown attribute 'retroactive'
extension FileHandle: @retroactive TextOutputStream {
                      ^
/Users/admin/builder/spi-builder-workspace/Sources/BuildEnvGenerator/stderror.swift:10:1: error: inheritance from non-protocol type 'any TextOutputStream'
extension FileHandle: @retroactive TextOutputStream {
^
error: fatalError
BUILD FAILURE 5.9 macosSpm