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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 Communicado with Swift 5.10 for macOS (SPM).

Build Command

env DEVELOPER_DIR=/Applications/Xcode-15.3.0-Beta.2.app xcrun swift build --arch arm64

Build Log

========================================
RunAll
========================================
Builder version: 4.29.0
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/mergesort/Communicado.git
Reference: master
Initialized empty Git repository in /Users/admin/builds/J1XnyXFH/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/.git/
From https://github.com/mergesort/Communicado
 * branch            master     -> FETCH_HEAD
 * [new branch]      master     -> origin/master
HEAD is now at dc10510 Merge branch 'master' of github.com:mergesort/Communicado
Cloned https://github.com/mergesort/Communicado.git
Revision (git rev-parse @):
dc10510f2005bd8e4f1107813046a57060f326a5
SUCCESS checkout https://github.com/mergesort/Communicado.git at master
========================================
Build
========================================
Selected platform:         macosSpm
Swift version:             5.10
Building package at path:  $workDir
https://github.com/mergesort/Communicado.git
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-15.3.0-Beta.2.app xcrun swift build --arch arm64
Building for debugging...
[0/2] Write sources
[1/2] Write swift-version--423B1241ED78D482.txt
error: emit-module command failed with exit code 1 (use -v to see invocation)
[3/8] Emitting module Communicado
/Users/admin/builds/J1XnyXFH/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Communicado/ShareDestination.swift:1:8: error: no such module 'MessageUI'
import MessageUI
       ^
[4/8] Compiling Communicado ShareDestination.swift
/Users/admin/builds/J1XnyXFH/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Communicado/ShareDestination.swift:1:8: error: no such module 'MessageUI'
import MessageUI
       ^
[5/8] Compiling Communicado AttachmentType.swift
/Users/admin/builds/J1XnyXFH/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Communicado/ShareDestination.swift:1:8: error: no such module 'MessageUI'
import MessageUI
       ^
[6/8] Compiling Communicado UIViewController+Sharing.swift
/Users/admin/builds/J1XnyXFH/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Communicado/ShareDestination.swift:1:8: error: no such module 'MessageUI'
import MessageUI
       ^
[7/8] Compiling Communicado Attachment.swift
/Users/admin/builds/J1XnyXFH/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Communicado/ShareDestination.swift:1:8: error: no such module 'MessageUI'
import MessageUI
       ^
[8/8] Compiling Communicado ShareParameters.swift
/Users/admin/builds/J1XnyXFH/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Communicado/ShareDestination.swift:1:8: error: no such module 'MessageUI'
import MessageUI
       ^
error: fatalError
[0/1] Planning build
Building for debugging...
[0/1] Write swift-version--423B1241ED78D482.txt
error: emit-module command failed with exit code 1 (use -v to see invocation)
[2/7] Emitting module Communicado
/Users/admin/builds/J1XnyXFH/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Communicado/ShareDestination.swift:1:8: error: no such module 'MessageUI'
import MessageUI
       ^
[3/7] Compiling Communicado AttachmentType.swift
/Users/admin/builds/J1XnyXFH/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Communicado/ShareDestination.swift:1:8: error: no such module 'MessageUI'
import MessageUI
       ^
[4/7] Compiling Communicado ShareParameters.swift
/Users/admin/builds/J1XnyXFH/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Communicado/ShareDestination.swift:1:8: error: no such module 'MessageUI'
import MessageUI
       ^
[5/7] Compiling Communicado UIViewController+Sharing.swift
/Users/admin/builds/J1XnyXFH/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Communicado/ShareDestination.swift:1:8: error: no such module 'MessageUI'
import MessageUI
       ^
[6/7] Compiling Communicado ShareDestination.swift
/Users/admin/builds/J1XnyXFH/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Communicado/ShareDestination.swift:1:8: error: no such module 'MessageUI'
import MessageUI
       ^
[7/7] Compiling Communicado Attachment.swift
/Users/admin/builds/J1XnyXFH/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Communicado/ShareDestination.swift:1:8: error: no such module 'MessageUI'
import MessageUI
       ^
error: fatalError
BUILD FAILURE 5.10 macosSpm