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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

Successful build of Observable, reference master (60aad1), with Swift 6.1 for macOS (SPM) on 30 Apr 2025 07:58:54 UTC.

Swift 6 data race errors: 0

Build Command

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

Build Log

========================================
RunAll
========================================
Builder version: 4.61.1
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/roberthein/Observable.git
Reference: master
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/roberthein/Observable
 * branch            master     -> FETCH_HEAD
 * [new branch]      master     -> origin/master
HEAD is now at 60aad1e Update min target
Cloned https://github.com/roberthein/Observable.git
Revision (git rev-parse @):
60aad1ecc56ae0b54e68bfb48aa89cb026488fc5
SUCCESS checkout https://github.com/roberthein/Observable.git at master
========================================
Build
========================================
Selected platform:         macosSpm
Swift version:             6.1
Building package at path:  $PWD
https://github.com/roberthein/Observable.git
https://github.com/roberthein/Observable.git
{
  "dependencies" : [
  ],
  "manifest_display_name" : "Observable",
  "name" : "Observable",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
    {
      "name" : "ios",
      "version" : "10.0"
    }
  ],
  "products" : [
    {
      "name" : "Observable",
      "targets" : [
        "Observable"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "ObservableTests",
      "module_type" : "SwiftTarget",
      "name" : "ObservableTests",
      "path" : "Observable/Tests",
      "sources" : [
        "Disposable_Tests.swift",
        "Observable_Tests.swift"
      ],
      "target_dependencies" : [
        "Observable"
      ],
      "type" : "test"
    },
    {
      "c99name" : "Observable",
      "module_type" : "SwiftTarget",
      "name" : "Observable",
      "path" : "Observable/Classes",
      "product_memberships" : [
        "Observable"
      ],
      "sources" : [
        "Disposable.swift",
        "Observable+Binding.swift",
        "Observable.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.0"
}
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
Building for debugging...
[0/2] Write sources
[1/2] Write swift-version-2F0A5646E1D333AE.txt
[3/6] Compiling Observable Observable.swift
/Users/admin/builder/spi-builder-workspace/Observable/Classes/Observable.swift:86:17: warning: capture of 'observer' with non-sendable type 'Observable<T>.Observer' (aka '(T, Optional<T>) -> ()') in a '@Sendable' closure
 84 |         if let queue = queue {
 85 |             queue.async {
 86 |                 observer(value, oldValue)
    |                 |- warning: capture of 'observer' with non-sendable type 'Observable<T>.Observer' (aka '(T, Optional<T>) -> ()') in a '@Sendable' closure
    |                 `- note: a function type must be marked '@Sendable' to conform to 'Sendable'
 87 |             }
 88 |         } else {
/Users/admin/builder/spi-builder-workspace/Observable/Classes/Observable.swift:86:26: warning: capture of 'value' with non-sendable type 'T' in a '@Sendable' closure
  4 | public typealias ImmutableObservable = Observable
  5 |
  6 | open class Observable<T> {
    |                       `- note: consider making generic parameter 'T' conform to the 'Sendable' protocol
  7 |
  8 |     public typealias Observer = (T, T?) -> Void
    :
 84 |         if let queue = queue {
 85 |             queue.async {
 86 |                 observer(value, oldValue)
    |                          `- warning: capture of 'value' with non-sendable type 'T' in a '@Sendable' closure
 87 |             }
 88 |         } else {
/Users/admin/builder/spi-builder-workspace/Observable/Classes/Observable.swift:86:33: warning: capture of 'oldValue' with non-sendable type 'T?' in a '@Sendable' closure
  4 | public typealias ImmutableObservable = Observable
  5 |
  6 | open class Observable<T> {
    |                       `- note: consider making generic parameter 'T' conform to the 'Sendable' protocol
  7 |
  8 |     public typealias Observer = (T, T?) -> Void
    :
 84 |         if let queue = queue {
 85 |             queue.async {
 86 |                 observer(value, oldValue)
    |                                 `- warning: capture of 'oldValue' with non-sendable type 'T?' in a '@Sendable' closure
 87 |             }
 88 |         } else {
[4/6] Compiling Observable Disposable.swift
[5/6] Compiling Observable Observable+Binding.swift
[6/6] Emitting module Observable
Build complete! (4.13s)
Build complete.
{
  "dependencies" : [
  ],
  "manifest_display_name" : "Observable",
  "name" : "Observable",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
    {
      "name" : "ios",
      "version" : "10.0"
    }
  ],
  "products" : [
    {
      "name" : "Observable",
      "targets" : [
        "Observable"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "ObservableTests",
      "module_type" : "SwiftTarget",
      "name" : "ObservableTests",
      "path" : "Observable/Tests",
      "sources" : [
        "Disposable_Tests.swift",
        "Observable_Tests.swift"
      ],
      "target_dependencies" : [
        "Observable"
      ],
      "type" : "test"
    },
    {
      "c99name" : "Observable",
      "module_type" : "SwiftTarget",
      "name" : "Observable",
      "path" : "Observable/Classes",
      "product_memberships" : [
        "Observable"
      ],
      "sources" : [
        "Disposable.swift",
        "Observable+Binding.swift",
        "Observable.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.0"
}
Done.