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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 ShallowPromises, reference master (9fbd4f), with Swift 6.1 for Linux on 26 Apr 2025 02:33:21 UTC.

Swift 6 data race errors: 0

Build Command

bash -c docker run --pull=always --rm -v "checkouts-4609320-0":/host -w "$PWD" registry.gitlab.com/finestructure/spi-images:basic-6.1-latest swift build --triple x86_64-unknown-linux-gnu -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 2>&1

Build Log

========================================
RunAll
========================================
Builder version: 4.61.0
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/JuanjoArreola/ShallowPromises.git
Reference: master
Initialized empty Git repository in /host/spi-builder-workspace/.git/
hint: Using 'master' as the name for the initial branch. This default branch name
hint: is subject to change. To configure the initial branch name to use in all
hint: of your new repositories, which will suppress this warning, call:
hint:
hint: 	git config --global init.defaultBranch <name>
hint:
hint: Names commonly chosen instead of 'master' are 'main', 'trunk' and
hint: 'development'. The just-created branch can be renamed via this command:
hint:
hint: 	git branch -m <name>
From https://github.com/JuanjoArreola/ShallowPromises
 * branch            master     -> FETCH_HEAD
 * [new branch]      master     -> origin/master
HEAD is now at 9fbd4ff Proxies
Cloned https://github.com/JuanjoArreola/ShallowPromises.git
Revision (git rev-parse @):
9fbd4ff04904c6631405145ecd8a7c6d0d9daf72
SUCCESS checkout https://github.com/JuanjoArreola/ShallowPromises.git at master
========================================
Build
========================================
Selected platform:         linux
Swift version:             6.1
Building package at path:  $PWD
https://github.com/JuanjoArreola/ShallowPromises.git
https://github.com/JuanjoArreola/ShallowPromises.git
WARNING: environment variable SUPPRESS_SWIFT_6_FLAGS is not set
{
  "dependencies" : [
  ],
  "manifest_display_name" : "ShallowPromises",
  "name" : "ShallowPromises",
  "path" : "/host/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "ShallowPromises",
      "targets" : [
        "ShallowPromises"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "ShallowPromisesTests",
      "module_type" : "SwiftTarget",
      "name" : "ShallowPromisesTests",
      "path" : "Tests/ShallowPromisesTests",
      "sources" : [
        "ErrorTests.swift",
        "ProxyTests.swift",
        "ShallowPromisesTests.swift",
        "SuccessTests.swift",
        "ThenTests.swift",
        "XCTestManifests.swift"
      ],
      "target_dependencies" : [
        "ShallowPromises"
      ],
      "type" : "test"
    },
    {
      "c99name" : "ShallowPromises",
      "module_type" : "SwiftTarget",
      "name" : "ShallowPromises",
      "path" : "Sources/ShallowPromises",
      "product_memberships" : [
        "ShallowPromises"
      ],
      "sources" : [
        "Cancellable.swift",
        "Futures.swift",
        "Promise.swift",
        "PromiseFailure.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.2"
}
Running build ...
bash -c docker run --pull=always --rm -v "checkouts-4609320-0":/host -w "$PWD" registry.gitlab.com/finestructure/spi-images:basic-6.1-latest swift build --triple x86_64-unknown-linux-gnu -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 2>&1
basic-6.1-latest: Pulling from finestructure/spi-images
Digest: sha256:3bdcac04179f4ed3e5b8e9dbd6e74bbf5ebc0f4fde48bbaad7d1e5c757e65bcb
Status: Image is up to date for registry.gitlab.com/finestructure/spi-images:basic-6.1-latest
Building for debugging...
[0/2] Write sources
[1/2] Write swift-version-24593BA9C3E375BF.txt
[3/7] Compiling ShallowPromises Cancellable.swift
[4/7] Emitting module ShallowPromises
[5/7] Compiling ShallowPromises PromiseFailure.swift
[6/7] Compiling ShallowPromises Futures.swift
/host/spi-builder-workspace/Sources/ShallowPromises/Futures.swift:40:17: warning: capture of 'future' with non-sendable type 'Future<U>' in a '@Sendable' closure; this is an error in the Swift 6 language mode
38 |             let queue = future.queue ?? queue
39 |             queue?.async {
40 |                 future.closure(result)
   |                 `- warning: capture of 'future' with non-sendable type 'Future<U>' in a '@Sendable' closure; this is an error in the Swift 6 language mode
41 |             } ?? future.closure(result)
42 |         }
   :
54 | }
55 |
56 | struct Future<T> {
   |        `- note: consider making generic struct 'Future' conform to the 'Sendable' protocol
57 |     let closure: (T) -> Void
58 |     let queue: DispatchQueue?
/host/spi-builder-workspace/Sources/ShallowPromises/Futures.swift:40:32: warning: capture of 'result' with non-sendable type 'U' in a '@Sendable' closure; this is an error in the Swift 6 language mode
34 |     }
35 |
36 |     private func complete<U>(futures: [Future<U>], with result: U, in queue: DispatchQueue?) {
   |                           `- note: consider making generic parameter 'U' conform to the 'Sendable' protocol
37 |         futures.forEach { future in
38 |             let queue = future.queue ?? queue
39 |             queue?.async {
40 |                 future.closure(result)
   |                                `- warning: capture of 'result' with non-sendable type 'U' in a '@Sendable' closure; this is an error in the Swift 6 language mode
41 |             } ?? future.closure(result)
42 |         }
/host/spi-builder-workspace/Sources/ShallowPromises/Futures.swift:50:17: warning: capture of 'future' with non-sendable type 'FinallyFuture' in a '@Sendable' closure; this is an error in the Swift 6 language mode
48 |             let queue = future.queue ?? queue
49 |             queue?.async {
50 |                 future.closure()
   |                 `- warning: capture of 'future' with non-sendable type 'FinallyFuture' in a '@Sendable' closure; this is an error in the Swift 6 language mode
51 |             } ?? future.closure()
52 |         }
   :
59 | }
60 |
61 | struct FinallyFuture {
   |        `- note: consider making struct 'FinallyFuture' conform to the 'Sendable' protocol
62 |     let closure: () -> Void
63 |     let queue: DispatchQueue?
[7/7] Compiling ShallowPromises Promise.swift
/host/spi-builder-workspace/Sources/ShallowPromises/Promise.swift:119:17: warning: capture of 'closure' with non-sendable type '(U) -> Void' in a '@Sendable' closure; this is an error in the Swift 6 language mode
117 |         if let result = safeResult {
118 |             queue?.async {
119 |                 closure(result)
    |                 |- warning: capture of 'closure' with non-sendable type '(U) -> Void' in a '@Sendable' closure; this is an error in the Swift 6 language mode
    |                 `- note: a function type must be marked '@Sendable' to conform to 'Sendable'
120 |             } ?? closure(result)
121 |         }
/host/spi-builder-workspace/Sources/ShallowPromises/Promise.swift:119:25: warning: capture of 'result' with non-sendable type 'U' in a '@Sendable' closure; this is an error in the Swift 6 language mode
 10 | private let syncQueue = DispatchQueue(label: "com.shallowpromises.SyncQueue", attributes: [])
 11 |
 12 | open class Promise<U>: Cancellable {
    |                    `- note: consider making generic parameter 'U' conform to the 'Sendable' protocol
 13 |
 14 |     private var result: U?
    :
117 |         if let result = safeResult {
118 |             queue?.async {
119 |                 closure(result)
    |                         `- warning: capture of 'result' with non-sendable type 'U' in a '@Sendable' closure; this is an error in the Swift 6 language mode
120 |             } ?? closure(result)
121 |         }
/host/spi-builder-workspace/Sources/ShallowPromises/Promise.swift:137:17: warning: capture of 'closure' with non-sendable type '(any Error) -> Void' in a '@Sendable' closure; this is an error in the Swift 6 language mode
135 |         if let error = safeError {
136 |             queue?.async {
137 |                 closure(error)
    |                 |- warning: capture of 'closure' with non-sendable type '(any Error) -> Void' in a '@Sendable' closure; this is an error in the Swift 6 language mode
    |                 `- note: a function type must be marked '@Sendable' to conform to 'Sendable'
138 |             } ?? closure(error)
139 |         }
/host/spi-builder-workspace/Sources/ShallowPromises/Promise.swift:154:17: warning: capture of 'closure' with non-sendable type '() -> Void' in a '@Sendable' closure; this is an error in the Swift 6 language mode
152 |         if isCompleted {
153 |             queue?.async {
154 |                 closure()
    |                 |- warning: capture of 'closure' with non-sendable type '() -> Void' in a '@Sendable' closure; this is an error in the Swift 6 language mode
    |                 `- note: a function type must be marked '@Sendable' to conform to 'Sendable'
155 |             } ?? closure()
156 |         }
Build complete! (5.38s)
Build complete.
{
  "dependencies" : [
  ],
  "manifest_display_name" : "ShallowPromises",
  "name" : "ShallowPromises",
  "path" : "/host/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "ShallowPromises",
      "targets" : [
        "ShallowPromises"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "ShallowPromisesTests",
      "module_type" : "SwiftTarget",
      "name" : "ShallowPromisesTests",
      "path" : "Tests/ShallowPromisesTests",
      "sources" : [
        "ErrorTests.swift",
        "ProxyTests.swift",
        "ShallowPromisesTests.swift",
        "SuccessTests.swift",
        "ThenTests.swift",
        "XCTestManifests.swift"
      ],
      "target_dependencies" : [
        "ShallowPromises"
      ],
      "type" : "test"
    },
    {
      "c99name" : "ShallowPromises",
      "module_type" : "SwiftTarget",
      "name" : "ShallowPromises",
      "path" : "Sources/ShallowPromises",
      "product_memberships" : [
        "ShallowPromises"
      ],
      "sources" : [
        "Cancellable.swift",
        "Futures.swift",
        "Promise.swift",
        "PromiseFailure.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.2"
}
basic-6.1-latest: Pulling from finestructure/spi-images
Digest: sha256:3bdcac04179f4ed3e5b8e9dbd6e74bbf5ebc0f4fde48bbaad7d1e5c757e65bcb
Status: Image is up to date for registry.gitlab.com/finestructure/spi-images:basic-6.1-latest
Done.