Swift Package IndexBuild Information
Successful build of swift-concurrency-extras, reference main (5fa253), with Swift 6.3 for macOS (SPM) on 24 Jul 2026 20:36:13 UTC.
Swift 6 data race errors: 0
Build Command
env DEVELOPER_DIR=/Applications/Xcode-26.4.0.app xcrun swift build --arch arm64Build Log
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RunAll
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Builder version: undefined version: run 'make version' to update
Interrupt handler set up.
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Checkout
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Clone URL: https://github.com/pointfreeco/swift-concurrency-extras.git
Reference: main
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/pointfreeco/swift-concurrency-extras
* branch main -> FETCH_HEAD
* [new branch] main -> origin/main
HEAD is now at 5fa2534 Run swift-format
Cloned https://github.com/pointfreeco/swift-concurrency-extras.git
Revision (git rev-parse @):
5fa253428866f2360c3754e88537f700ed2656b5
SPI manifest file found: $PWD/.spi.yml
SUCCESS checkout https://github.com/pointfreeco/swift-concurrency-extras.git at main
Fetching https://github.com/apple/swift-docc-plugin
[1/2325] Fetching swift-docc-plugin
Fetched https://github.com/apple/swift-docc-plugin from cache (1.14s)
Computing version for https://github.com/apple/swift-docc-plugin
Computed https://github.com/apple/swift-docc-plugin at 1.0.0 (3.99s)
Creating working copy for https://github.com/apple/swift-docc-plugin
Working copy of https://github.com/apple/swift-docc-plugin resolved at 1.0.0
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ResolveProductDependencies
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Resolving dependencies ...
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Fetching https://github.com/pointfreeco/swift-concurrency-extras.git
[1/1058] Fetching swift-concurrency-extras
Fetched https://github.com/pointfreeco/swift-concurrency-extras.git from cache (0.82s)
Creating working copy for https://github.com/pointfreeco/swift-concurrency-extras.git
Working copy of https://github.com/pointfreeco/swift-concurrency-extras.git resolved at main (5fa2534)
warning: '.resolve-product-dependencies': dependency 'swift-concurrency-extras' is not used by any target
Found 0 product dependencies
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Build
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Selected platform: macosSpm
Swift version: 6.3
Building package at path: $PWD
https://github.com/pointfreeco/swift-concurrency-extras.git
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-26.4.0.app xcrun swift build --arch arm64
[1/1] Compiling plugin Swift-DocC Preview
[2/2] Compiling plugin Swift-DocC
Building for debugging...
[2/5] Write sources
[4/5] Write swift-version--6988338F2F200930.txt
[6/18] Compiling ConcurrencyExtrasTestSupport TaskLocalTrait.swift
[7/18] Emitting module ConcurrencyExtrasTestSupport
[8/18] Emitting module ConcurrencyExtras
[9/18] Compiling ConcurrencyExtras ActorIsolated.swift
[10/18] Compiling ConcurrencyExtras AnyHashableSendable.swift
[11/18] Compiling ConcurrencyExtras AsyncStream.swift
[12/19] Compiling ConcurrencyExtras LockIsolated.swift
[13/19] Compiling ConcurrencyExtras MainSerialExecutor.swift
[14/19] Compiling ConcurrencyExtras Result.swift
[15/19] Compiling ConcurrencyExtras Task.swift
[16/19] Compiling ConcurrencyExtras Locking.swift
[17/19] Compiling ConcurrencyExtras UncheckedBox.swift
[18/19] Compiling ConcurrencyExtras AsyncThrowingStream.swift
[19/19] Compiling ConcurrencyExtras UncheckedSendable.swift
Build complete! (11.69s)
Build complete.
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✅ Doc result (pending) reported
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GenerateDocs
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Generating docs at path: $PWD/.docs/pointfreeco/swift-concurrency-extras/main
Repository: pointfreeco/swift-concurrency-extras
Swift version used: 6.3
.package(url: "https://github.com/apple/swift-docc-plugin", from: "1.0.0")
Target: ConcurrencyExtras
Generating documentation for 'ConcurrencyExtras'...
Converting documentation...
warning: '79jpc' isn't a disambiguation for 'withMainSerialExecutor(operation:)' at '/ConcurrencyExtras'
--> ConcurrencyExtras.md:92:47-92:53
90 | Some asynchronous code is [notoriously difficult][reliably-testing-swift-concurrency] to test in
91 | Swift due to how suspension points are processed by the runtime. The library comes with a static
92 + function, ``withMainSerialExecutor(operation:)-79jpc``, that runs all tasks spawned in an operation
| ├─suggestion: Replace '79jpc' with '(()()->Void)' for '@MainActor func withMainSerialExecutor(operation: @isolated(any) () async throws -> Void) async rethrows'
| ╰─suggestion: Replace '79jpc' with '(()->Void)' for 'func withMainSerialExecutor(operation: () throws -> Void) rethrows'
93 | serially and deterministically. This function can be used to make asynchronous tests faster and less
94 | flakey.
warning: '79jpc' isn't a disambiguation for 'withMainSerialExecutor(operation:)' at '/ConcurrencyExtras'
--> ConcurrencyExtras.md:189:67-189:73
187 | causing a test failure.
188 |
189 + If we wrap the entire test in ``withMainSerialExecutor(operation:)-79jpc``, then it will pass
| ├─suggestion: Replace '79jpc' with '(()()->Void)' for '@MainActor func withMainSerialExecutor(operation: @isolated(any) () async throws -> Void) async rethrows'
| ╰─suggestion: Replace '79jpc' with '(()->Void)' for 'func withMainSerialExecutor(operation: () throws -> Void) rethrows'
190 | deterministically, 100% of the time:
191 |
warning: '79jpc' isn't a disambiguation for 'withMainSerialExecutor(operation:)' at '/ConcurrencyExtras'
--> ConcurrencyExtras.md:220:56-220:62
218 | Now the entire `FeatureModelTests` test case will be run on the main, serial executor.
219 |
220 + Note that by using ``withMainSerialExecutor(operation:)-79jpc`` you are technically making your
| ├─suggestion: Replace '79jpc' with '(()()->Void)' for '@MainActor func withMainSerialExecutor(operation: @isolated(any) () async throws -> Void) async rethrows'
| ╰─suggestion: Replace '79jpc' with '(()->Void)' for 'func withMainSerialExecutor(operation: () throws -> Void) rethrows'
221 | tests behave in a manner that is different from how they would run in production. However, many
222 | tests written on a day-to-day basis due not invoke the full-blown vagaries of concurrency. Instead
warning: '79jpc' isn't a disambiguation for 'withMainSerialExecutor(operation:)' at '/ConcurrencyExtras'
--> ConcurrencyExtras.md:228:37-228:43
226 | If your code has truly complex asynchronous and concurrent operations, then it may be handy to write
227 | two sets of tests: one set that targets the main executor (using
228 + ``withMainSerialExecutor(operation:)-79jpc``) so that you can deterministically assert how the core
| ├─suggestion: Replace '79jpc' with '(()()->Void)' for '@MainActor func withMainSerialExecutor(operation: @isolated(any) () async throws -> Void) async rethrows'
| ╰─suggestion: Replace '79jpc' with '(()->Void)' for 'func withMainSerialExecutor(operation: () throws -> Void) rethrows'
229 | system behaves, and then another set that targets the default, global executor that will probably
230 | need to make weaker assertions due to non-determinism, but can still assert on some things.
warning: '5wq73' isn't a disambiguation for 'withMainSerialExecutor(operation:)' at '/ConcurrencyExtras'
--> ConcurrencyExtras.md:244:39-244:45
242 |
243 | - <doc:ReliablyTestingAsync>
244 + - ``withMainSerialExecutor(operation:)-5wq73``
| ├─suggestion: Replace '5wq73' with '(()()->Void)' for '@MainActor func withMainSerialExecutor(operation: @isolated(any) () async throws -> Void) async rethrows'
| ╰─suggestion: Replace '5wq73' with '(()->Void)' for 'func withMainSerialExecutor(operation: () throws -> Void) rethrows'
245 |
246 | ### Preconcurrency
warning: '79jpc' isn't a disambiguation for 'withMainSerialExecutor(operation:)' at '/ConcurrencyExtras'
--> ReliablyTestingAsync.md:178:68-178:74
176 | And so if Apple can write tests like this, why can't we?
177 |
178 + Well, now we can thanks to the ``withMainSerialExecutor(operation:)-79jpc`` tool that ships with
| ├─suggestion: Replace '79jpc' with '(()()->Void)' for '@MainActor func withMainSerialExecutor(operation: @isolated(any) () async throws -> Void) async rethrows'
| ╰─suggestion: Replace '79jpc' with '(()->Void)' for 'func withMainSerialExecutor(operation: () throws -> Void) rethrows'
179 | this library. It temporarily alters the manner in which Swift enqueues asynchronous work in order
180 | to serialize it to the main thread. This allows you to test every facet of the async code, including
warning: '79jpc' isn't a disambiguation for 'withMainSerialExecutor(operation:)' at '/ConcurrencyExtras'
--> ReliablyTestingAsync.md:226:56-226:62
224 | ## Testing reality
225 |
226 + Note that by using ``withMainSerialExecutor(operation:)-79jpc`` you are technically making your
| ├─suggestion: Replace '79jpc' with '(()()->Void)' for '@MainActor func withMainSerialExecutor(operation: @isolated(any) () async throws -> Void) async rethrows'
| ╰─suggestion: Replace '79jpc' with '(()->Void)' for 'func withMainSerialExecutor(operation: () throws -> Void) rethrows'
227 | tests behave in a manner that is different from how they would run in production. However, many
228 | tests written on a day-to-day basis do not invoke the full-blown vagaries of concurrency. Instead,
warning: '79jpc' isn't a disambiguation for 'withMainSerialExecutor(operation:)' at '/ConcurrencyExtras'
--> ReliablyTestingAsync.md:251:37-251:43
249 | a deterministic sequence of outputs, the same is true of user actions in an application. And so we
250 | too feel that many of the tests we write on a daily basis can be run inside
251 + ``withMainSerialExecutor(operation:)-79jpc`` and that we are not weakening the strength of those
| ├─suggestion: Replace '79jpc' with '(()()->Void)' for '@MainActor func withMainSerialExecutor(operation: @isolated(any) () async throws -> Void) async rethrows'
| ╰─suggestion: Replace '79jpc' with '(()->Void)' for 'func withMainSerialExecutor(operation: () throws -> Void) rethrows'
252 | tests in the least.
253 |
warning: '79jpc' isn't a disambiguation for 'withMainSerialExecutor(operation:)' at '/ConcurrencyExtras'
--> ReliablyTestingAsync.md:255:111-255:117
253 |
254 | However, if your code has truly complex asynchronous and concurrent operations, then it may be handy
255 + to write two sets of tests: one set that targets the main executor (using ``withMainSerialExecutor(operation:)-79jpc``)
| ├─suggestion: Replace '79jpc' with '(()()->Void)' for '@MainActor func withMainSerialExecutor(operation: @isolated(any) () async throws -> Void) async rethrows'
| ╰─suggestion: Replace '79jpc' with '(()->Void)' for 'func withMainSerialExecutor(operation: () throws -> Void) rethrows'
256 | so that you can deterministically assert how the core system behaves, and then another set that
257 | targets the default, global executor. The latter tests will probably need to make weaker assertions
warning: No symbol matched 'ConcurrencyExtras/withMainSerialExecutor(operation:)-79jpc'. '79jpc' isn't a disambiguation for 'withMainSerialExecutor(operation:)' at '/ConcurrencyExtras'.
--> WithMainSerialExecutor.md:1:3-1:65
1 + # ``ConcurrencyExtras/withMainSerialExecutor(operation:)-79jpc``
| ├─suggestion: Replace '79jpc' with '(()()->Void)' for '@MainActor func withMainSerialExecutor(operation: @isolated(any) () async throws -> Void) async rethrows'
| ╰─suggestion: Replace '79jpc' with '(()->Void)' for 'func withMainSerialExecutor(operation: () throws -> Void) rethrows'
2 |
3 | ## Topics
Conversion complete! (0.52s)
Generated DocC archive at '/Users/admin/builder/spi-builder-workspace/.docs/pointfreeco/swift-concurrency-extras/main'
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Build of target: 'ConcurrencyExtras' complete! (0.21s)
Target: ConcurrencyExtrasTestSupport
Generating documentation for 'ConcurrencyExtrasTestSupport'...
Converting documentation...
warning: 'Testing' doesn't exist at '/ConcurrencyExtrasTestSupport'
--> ConcurrencyExtrasTestSupport.md:14:5-14:12
12 | ### Traits
13 |
14 + - ``Testing/Trait/taskLocal(_:_:)``
15 | - ``_Concurrency/TaskLocal/set(_:)``
16 | - ``ConcurrencyExtrasTestSupport/TaskLocalTrait``
warning: '_Concurrency' doesn't exist at '/ConcurrencyExtrasTestSupport'
--> ConcurrencyExtrasTestSupport.md:15:5-15:17
13 |
14 | - ``Testing/Trait/taskLocal(_:_:)``
15 + - ``_Concurrency/TaskLocal/set(_:)``
16 | - ``ConcurrencyExtrasTestSupport/TaskLocalTrait``
Conversion complete! (0.07s)
Generated DocC archive at '/Users/admin/builder/spi-builder-workspace/.docs/pointfreeco/swift-concurrency-extras/main'
Building for debugging...
[0/1] Write swift-version--6988338F2F200930.txt
Build of target: 'ConcurrencyExtrasTestSupport' complete! (0.20s)
Successfully merged into /Users/admin/builder/spi-builder-workspace/.docs-staging/pointfreeco/swift-concurrency-extras/main/index/index.json
Successfully merged into /Users/admin/builder/spi-builder-workspace/.docs-staging/pointfreeco/swift-concurrency-extras/main/linkable-paths.json
260
3 /Users/admin/builder/spi-builder-workspace/.docs/pointfreeco/swift-concurrency-extras/main
✅ Doc result (uploading) reported
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SyncDocs
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Doc archive source directory: $PWD/.docs/pointfreeco/swift-concurrency-extras/main
File count: 260
Doc size: 3.0MB
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