Swift Package IndexBuild Information
Failed to build Future, reference 1.4.0 (ff9634), with Swift 6.3 for Wasm on 11 Apr 2026 13:00:53 UTC.
Build Command
bash -c docker run --pull=always --rm -v "checkouts-4609320-2":/host -w "$PWD" -e JAVA_HOME="/root/.sdkman/candidates/java/current" -e SPI_BUILD="1" -e SPI_PROCESSING="1" registry.gitlab.com/swiftpackageindex/spi-images:wasm-6.3-latest swift build --swift-sdk swift-6.3-RELEASE_wasm 2>&1Build Log
========================================
RunAll
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Builder version: 4.70.0
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/kean/Future.git
Reference: 1.4.0
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/kean/Future
* tag 1.4.0 -> FETCH_HEAD
HEAD is now at ff9634c Version 1.4.0
Cloned https://github.com/kean/Future.git
Revision (git rev-parse @):
ff9634c819962aa78f7bb360fdae7299d62f1cdc
SUCCESS checkout https://github.com/kean/Future.git at 1.4.0
========================================
Build
========================================
Selected platform: wasm
Swift version: 6.3
Building package at path: $PWD
https://github.com/kean/Future.git
Running build ...
bash -c docker run --pull=always --rm -v "checkouts-4609320-2":/host -w "$PWD" -e JAVA_HOME="/root/.sdkman/candidates/java/current" -e SPI_BUILD="1" -e SPI_PROCESSING="1" registry.gitlab.com/swiftpackageindex/spi-images:wasm-6.3-latest swift build --swift-sdk swift-6.3-RELEASE_wasm 2>&1
wasm-6.3-latest: Pulling from swiftpackageindex/spi-images
Digest: sha256:d69f4e7582c319245442d62a08b2d7c7fd5a0c0c69f5d2ef11d1530cd8d3329b
Status: Image is up to date for registry.gitlab.com/swiftpackageindex/spi-images:wasm-6.3-latest
Building for debugging...
[0/2] Write sources
[1/2] Write swift-version-24593BA9C3E375BF.txt
error: emit-module command failed with exit code 1 (use -v to see invocation)
[3/7] Compiling Future FutureOperators.swift
[4/7] Compiling Future CancellationToken.swift
[5/7] Emitting module Future
/host/spi-builder-workspace/Sources/Future.swift:78:35: error: cannot find type 'DispatchQueue' in scope
76 | /// Returns a new future which dispatches the callbacks on the given scheduler.
77 | /// This includes both `on` method and the composition functions like `map`.
78 | public func observe(on queue: DispatchQueue) -> Future {
| `- error: cannot find type 'DispatchQueue' in scope
79 | Future(resolver: resolver, scheduler: Scheduler.async(on: queue))
80 | }
/host/spi-builder-workspace/Sources/Future.swift:298:9: error: cannot find 'Thread' in scope
296 | /// asynchronously on the main thread.
297 | public static let main: ScheduleWork = { work in
298 | Thread.isMainThread ? work() : DispatchQueue.main.async(execute: work)
| `- error: cannot find 'Thread' in scope
299 | }
300 |
/host/spi-builder-workspace/Sources/Future.swift:298:40: error: cannot find 'DispatchQueue' in scope
296 | /// asynchronously on the main thread.
297 | public static let main: ScheduleWork = { work in
298 | Thread.isMainThread ? work() : DispatchQueue.main.async(execute: work)
| `- error: cannot find 'DispatchQueue' in scope
299 | }
300 |
/host/spi-builder-workspace/Sources/Future.swift:307:40: error: cannot find type 'DispatchQueue' in scope
305 |
306 | /// Runs asynchronously on the given queue.
307 | public static func async(on queue: DispatchQueue, flags: DispatchWorkItemFlags = []) -> ScheduleWork {
| `- error: cannot find type 'DispatchQueue' in scope
308 | return { work in
309 | queue.async(flags: flags, execute: work)
/host/spi-builder-workspace/Sources/Future.swift:307:62: error: cannot find type 'DispatchWorkItemFlags' in scope
305 |
306 | /// Runs asynchronously on the given queue.
307 | public static func async(on queue: DispatchQueue, flags: DispatchWorkItemFlags = []) -> ScheduleWork {
| `- error: cannot find type 'DispatchWorkItemFlags' in scope
308 | return { work in
309 | queue.async(flags: flags, execute: work)
/host/spi-builder-workspace/Sources/FutureExtensions.swift:37:63: error: cannot find type 'DispatchQueue' in scope
35 | /// - seconds: The time interval after which the future succeeds.
36 | /// - queue: The queue on which futures succeeds, `.global` by default.
37 | public static func after(seconds: TimeInterval, on queue: DispatchQueue = .global()) -> Future<Void, Never> {
| `- error: cannot find type 'DispatchQueue' in scope
38 | after(deadline: .now() + seconds, on: queue)
39 | }
/host/spi-builder-workspace/Sources/FutureExtensions.swift:46:42: error: cannot find type 'DispatchTimeInterval' in scope
44 | /// - interval: The time interval after which the future succeeds.
45 | /// - queue: The queue on which futures succeeds, `.global` by default.
46 | public static func after(_ interval: DispatchTimeInterval, on queue: DispatchQueue = .global()) -> Future<Void, Never> {
| `- error: cannot find type 'DispatchTimeInterval' in scope
47 | after(deadline: .now() + interval, on: queue)
48 | }
/host/spi-builder-workspace/Sources/FutureExtensions.swift:46:74: error: cannot find type 'DispatchQueue' in scope
44 | /// - interval: The time interval after which the future succeeds.
45 | /// - queue: The queue on which futures succeeds, `.global` by default.
46 | public static func after(_ interval: DispatchTimeInterval, on queue: DispatchQueue = .global()) -> Future<Void, Never> {
| `- error: cannot find type 'DispatchQueue' in scope
47 | after(deadline: .now() + interval, on: queue)
48 | }
/host/spi-builder-workspace/Sources/FutureExtensions.swift:50:41: error: cannot find type 'DispatchTime' in scope
48 | }
49 |
50 | private static func after(deadline: DispatchTime, on queue: DispatchQueue = .global()) -> Future<Void, Never> {
| `- error: cannot find type 'DispatchTime' in scope
51 | let promise = Promise()
52 | queue.asyncAfter(deadline: deadline) {
/host/spi-builder-workspace/Sources/FutureExtensions.swift:50:65: error: cannot find type 'DispatchQueue' in scope
48 | }
49 |
50 | private static func after(deadline: DispatchTime, on queue: DispatchQueue = .global()) -> Future<Void, Never> {
| `- error: cannot find type 'DispatchQueue' in scope
51 | let promise = Promise()
52 | queue.asyncAfter(deadline: deadline) {
/host/spi-builder-workspace/Sources/FutureExtensions.swift:199:25: error: cannot find 'DispatchQueue' in scope
197 | }
198 |
199 | private let waitQueue = DispatchQueue(label: "com.github.kean.future.wait-queue", attributes: .concurrent)
| `- error: cannot find 'DispatchQueue' in scope
200 |
/host/spi-builder-workspace/Sources/FutureExtensions.swift:199:96: error: cannot infer contextual base in reference to member 'concurrent'
197 | }
198 |
199 | private let waitQueue = DispatchQueue(label: "com.github.kean.future.wait-queue", attributes: .concurrent)
| `- error: cannot infer contextual base in reference to member 'concurrent'
200 |
[6/7] Compiling Future FutureExtensions.swift
/host/spi-builder-workspace/Sources/FutureExtensions.swift:37:63: error: cannot find type 'DispatchQueue' in scope
35 | /// - seconds: The time interval after which the future succeeds.
36 | /// - queue: The queue on which futures succeeds, `.global` by default.
37 | public static func after(seconds: TimeInterval, on queue: DispatchQueue = .global()) -> Future<Void, Never> {
| `- error: cannot find type 'DispatchQueue' in scope
38 | after(deadline: .now() + seconds, on: queue)
39 | }
/host/spi-builder-workspace/Sources/FutureExtensions.swift:46:42: error: cannot find type 'DispatchTimeInterval' in scope
44 | /// - interval: The time interval after which the future succeeds.
45 | /// - queue: The queue on which futures succeeds, `.global` by default.
46 | public static func after(_ interval: DispatchTimeInterval, on queue: DispatchQueue = .global()) -> Future<Void, Never> {
| `- error: cannot find type 'DispatchTimeInterval' in scope
47 | after(deadline: .now() + interval, on: queue)
48 | }
/host/spi-builder-workspace/Sources/FutureExtensions.swift:46:74: error: cannot find type 'DispatchQueue' in scope
44 | /// - interval: The time interval after which the future succeeds.
45 | /// - queue: The queue on which futures succeeds, `.global` by default.
46 | public static func after(_ interval: DispatchTimeInterval, on queue: DispatchQueue = .global()) -> Future<Void, Never> {
| `- error: cannot find type 'DispatchQueue' in scope
47 | after(deadline: .now() + interval, on: queue)
48 | }
/host/spi-builder-workspace/Sources/FutureExtensions.swift:50:41: error: cannot find type 'DispatchTime' in scope
48 | }
49 |
50 | private static func after(deadline: DispatchTime, on queue: DispatchQueue = .global()) -> Future<Void, Never> {
| `- error: cannot find type 'DispatchTime' in scope
51 | let promise = Promise()
52 | queue.asyncAfter(deadline: deadline) {
/host/spi-builder-workspace/Sources/FutureExtensions.swift:50:65: error: cannot find type 'DispatchQueue' in scope
48 | }
49 |
50 | private static func after(deadline: DispatchTime, on queue: DispatchQueue = .global()) -> Future<Void, Never> {
| `- error: cannot find type 'DispatchQueue' in scope
51 | let promise = Promise()
52 | queue.asyncAfter(deadline: deadline) {
/host/spi-builder-workspace/Sources/FutureExtensions.swift:199:25: error: cannot find 'DispatchQueue' in scope
197 | }
198 |
199 | private let waitQueue = DispatchQueue(label: "com.github.kean.future.wait-queue", attributes: .concurrent)
| `- error: cannot find 'DispatchQueue' in scope
200 |
/host/spi-builder-workspace/Sources/FutureExtensions.swift:199:96: error: cannot infer contextual base in reference to member 'concurrent'
197 | }
198 |
199 | private let waitQueue = DispatchQueue(label: "com.github.kean.future.wait-queue", attributes: .concurrent)
| `- error: cannot infer contextual base in reference to member 'concurrent'
200 |
/host/spi-builder-workspace/Sources/FutureExtensions.swift:38:26: error: cannot call value of non-function type 'Date'
36 | /// - queue: The queue on which futures succeeds, `.global` by default.
37 | public static func after(seconds: TimeInterval, on queue: DispatchQueue = .global()) -> Future<Void, Never> {
38 | after(deadline: .now() + seconds, on: queue)
| `- error: cannot call value of non-function type 'Date'
39 | }
40 |
/host/spi-builder-workspace/Sources/FutureExtensions.swift:190:25: error: cannot find 'DispatchSemaphore' in scope
188 | /// main thread!
189 | public func wait() -> Result {
190 | let semaphore = DispatchSemaphore(value: 0)
| `- error: cannot find 'DispatchSemaphore' in scope
191 | observe(on: waitQueue).on(completion: {
192 | semaphore.signal()
/host/spi-builder-workspace/Sources/Future.swift:78:35: error: cannot find type 'DispatchQueue' in scope
76 | /// Returns a new future which dispatches the callbacks on the given scheduler.
77 | /// This includes both `on` method and the composition functions like `map`.
78 | public func observe(on queue: DispatchQueue) -> Future {
| `- error: cannot find type 'DispatchQueue' in scope
79 | Future(resolver: resolver, scheduler: Scheduler.async(on: queue))
80 | }
[7/7] Compiling Future Future.swift
/host/spi-builder-workspace/Sources/Future.swift:78:35: error: cannot find type 'DispatchQueue' in scope
76 | /// Returns a new future which dispatches the callbacks on the given scheduler.
77 | /// This includes both `on` method and the composition functions like `map`.
78 | public func observe(on queue: DispatchQueue) -> Future {
| `- error: cannot find type 'DispatchQueue' in scope
79 | Future(resolver: resolver, scheduler: Scheduler.async(on: queue))
80 | }
/host/spi-builder-workspace/Sources/Future.swift:298:9: error: cannot find 'Thread' in scope
296 | /// asynchronously on the main thread.
297 | public static let main: ScheduleWork = { work in
298 | Thread.isMainThread ? work() : DispatchQueue.main.async(execute: work)
| `- error: cannot find 'Thread' in scope
299 | }
300 |
/host/spi-builder-workspace/Sources/Future.swift:298:40: error: cannot find 'DispatchQueue' in scope
296 | /// asynchronously on the main thread.
297 | public static let main: ScheduleWork = { work in
298 | Thread.isMainThread ? work() : DispatchQueue.main.async(execute: work)
| `- error: cannot find 'DispatchQueue' in scope
299 | }
300 |
/host/spi-builder-workspace/Sources/Future.swift:307:40: error: cannot find type 'DispatchQueue' in scope
305 |
306 | /// Runs asynchronously on the given queue.
307 | public static func async(on queue: DispatchQueue, flags: DispatchWorkItemFlags = []) -> ScheduleWork {
| `- error: cannot find type 'DispatchQueue' in scope
308 | return { work in
309 | queue.async(flags: flags, execute: work)
/host/spi-builder-workspace/Sources/Future.swift:307:62: error: cannot find type 'DispatchWorkItemFlags' in scope
305 |
306 | /// Runs asynchronously on the given queue.
307 | public static func async(on queue: DispatchQueue, flags: DispatchWorkItemFlags = []) -> ScheduleWork {
| `- error: cannot find type 'DispatchWorkItemFlags' in scope
308 | return { work in
309 | queue.async(flags: flags, execute: work)
BUILD FAILURE 6.3 wasm