Swift Package IndexBuild Information
Failed to build Deferred, reference develop (c82b9e), with Swift 6.3 for Wasm on 21 Apr 2026 08:41:38 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
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RunAll
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Builder version: 4.70.0
Interrupt handler set up.
========================================
Checkout
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Clone URL: https://github.com/bignerdranch/Deferred.git
Reference: develop
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/bignerdranch/Deferred
* branch develop -> FETCH_HEAD
* [new branch] develop -> origin/develop
HEAD is now at c82b9ef Add concurrency migration guide
Cloned https://github.com/bignerdranch/Deferred.git
Revision (git rev-parse @):
c82b9ef73132ac88a768b9e2fdbab7765346c61d
SUCCESS checkout https://github.com/bignerdranch/Deferred.git at develop
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Build
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Selected platform: wasm
Swift version: 6.3
Building package at path: $PWD
https://github.com/bignerdranch/Deferred.git
Running build ...
bash -c docker run --pull=always --rm -v "checkouts-4609320-2":/host -w "$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
warning: 'spi-builder-workspace': Invalid Exclude '/host/spi-builder-workspace/Tests/DeferredTests/Tests/AllTestsCommon.swift': File not found.
warning: 'spi-builder-workspace': Invalid Exclude '/host/spi-builder-workspace/Tests/TaskTests/Tests/AllTestsCommon.swift': File not found.
Building for debugging...
[0/4] Write sources
[2/4] Compiling CAtomics Empty.c
[3/4] Write swift-version-24593BA9C3E375BF.txt
error: emit-module command failed with exit code 1 (use -v to see invocation)
[5/22] Emitting module Deferred
/host/spi-builder-workspace/Sources/Deferred/Atomics.swift:19:22: warning: using '@_implementationOnly' without enabling library evolution for 'Deferred' may lead to instability during execution [#ImplementationOnlyDeprecated]
17 |
18 | #if SWIFT_PACKAGE || (canImport(CAtomics) && !FORCE_PLAYGROUND_COMPATIBILITY)
19 | @_implementationOnly import CAtomics
| `- warning: using '@_implementationOnly' without enabling library evolution for 'Deferred' may lead to instability during execution [#ImplementationOnlyDeprecated]
20 | #elseif canImport(Darwin)
21 | #warning("Using fallback implementation for Swift Playgrounds. This is unsafe for use in production. Check your build setup.")
/host/spi-builder-workspace/Sources/Deferred/Deferred.swift:9:8: error: no such module 'Dispatch'
7 | //
8 |
9 | import Dispatch
| `- error: no such module 'Dispatch'
10 |
11 | /// A value that may become determined (or "filled") at some point in the
[#ImplementationOnlyDeprecated]: <https://docs.swift.org/compiler/documentation/diagnostics/implementation-only-deprecated>
[6/24] Compiling Deferred Atomics.swift
/host/spi-builder-workspace/Sources/Deferred/Atomics.swift:19:22: warning: using '@_implementationOnly' without enabling library evolution for 'Deferred' may lead to instability during execution [#ImplementationOnlyDeprecated]
17 |
18 | #if SWIFT_PACKAGE || (canImport(CAtomics) && !FORCE_PLAYGROUND_COMPATIBILITY)
19 | @_implementationOnly import CAtomics
| `- warning: using '@_implementationOnly' without enabling library evolution for 'Deferred' may lead to instability during execution [#ImplementationOnlyDeprecated]
20 | #elseif canImport(Darwin)
21 | #warning("Using fallback implementation for Swift Playgrounds. This is unsafe for use in production. Check your build setup.")
/host/spi-builder-workspace/Sources/Deferred/Deferred.swift:9:8: error: no such module 'Dispatch'
7 | //
8 |
9 | import Dispatch
| `- error: no such module 'Dispatch'
10 |
11 | /// A value that may become determined (or "filled") at some point in the
[#ImplementationOnlyDeprecated]: <https://docs.swift.org/compiler/documentation/diagnostics/implementation-only-deprecated>
[7/24] Compiling Deferred Deferred.swift
/host/spi-builder-workspace/Sources/Deferred/Atomics.swift:19:22: warning: using '@_implementationOnly' without enabling library evolution for 'Deferred' may lead to instability during execution [#ImplementationOnlyDeprecated]
17 |
18 | #if SWIFT_PACKAGE || (canImport(CAtomics) && !FORCE_PLAYGROUND_COMPATIBILITY)
19 | @_implementationOnly import CAtomics
| `- warning: using '@_implementationOnly' without enabling library evolution for 'Deferred' may lead to instability during execution [#ImplementationOnlyDeprecated]
20 | #elseif canImport(Darwin)
21 | #warning("Using fallback implementation for Swift Playgrounds. This is unsafe for use in production. Check your build setup.")
/host/spi-builder-workspace/Sources/Deferred/Deferred.swift:9:8: error: no such module 'Dispatch'
7 | //
8 |
9 | import Dispatch
| `- error: no such module 'Dispatch'
10 |
11 | /// A value that may become determined (or "filled") at some point in the
[#ImplementationOnlyDeprecated]: <https://docs.swift.org/compiler/documentation/diagnostics/implementation-only-deprecated>
[8/24] Compiling Deferred DeferredQueue.swift
/host/spi-builder-workspace/Sources/Deferred/Atomics.swift:19:22: warning: using '@_implementationOnly' without enabling library evolution for 'Deferred' may lead to instability during execution [#ImplementationOnlyDeprecated]
17 |
18 | #if SWIFT_PACKAGE || (canImport(CAtomics) && !FORCE_PLAYGROUND_COMPATIBILITY)
19 | @_implementationOnly import CAtomics
| `- warning: using '@_implementationOnly' without enabling library evolution for 'Deferred' may lead to instability during execution [#ImplementationOnlyDeprecated]
20 | #elseif canImport(Darwin)
21 | #warning("Using fallback implementation for Swift Playgrounds. This is unsafe for use in production. Check your build setup.")
/host/spi-builder-workspace/Sources/Deferred/Deferred.swift:9:8: error: no such module 'Dispatch'
7 | //
8 |
9 | import Dispatch
| `- error: no such module 'Dispatch'
10 |
11 | /// A value that may become determined (or "filled") at some point in the
[#ImplementationOnlyDeprecated]: <https://docs.swift.org/compiler/documentation/diagnostics/implementation-only-deprecated>
[9/24] Compiling Deferred FutureMap.swift
/host/spi-builder-workspace/Sources/Deferred/Deferred.swift:9:8: error: no such module 'Dispatch'
7 | //
8 |
9 | import Dispatch
| `- error: no such module 'Dispatch'
10 |
11 | /// A value that may become determined (or "filled") at some point in the
[10/24] Compiling Deferred FuturePeek.swift
/host/spi-builder-workspace/Sources/Deferred/Deferred.swift:9:8: error: no such module 'Dispatch'
7 | //
8 |
9 | import Dispatch
| `- error: no such module 'Dispatch'
10 |
11 | /// A value that may become determined (or "filled") at some point in the
[11/24] Compiling Deferred FutureCollections.swift
/host/spi-builder-workspace/Sources/Deferred/Deferred.swift:9:8: error: no such module 'Dispatch'
7 | //
8 |
9 | import Dispatch
| `- error: no such module 'Dispatch'
10 |
11 | /// A value that may become determined (or "filled") at some point in the
[12/24] Compiling Deferred FutureComposition.swift
/host/spi-builder-workspace/Sources/Deferred/Deferred.swift:9:8: error: no such module 'Dispatch'
7 | //
8 |
9 | import Dispatch
| `- error: no such module 'Dispatch'
10 |
11 | /// A value that may become determined (or "filled") at some point in the
[13/24] Compiling Deferred FutureEveryMap.swift
/host/spi-builder-workspace/Sources/Deferred/Deferred.swift:9:8: error: no such module 'Dispatch'
7 | //
8 |
9 | import Dispatch
| `- error: no such module 'Dispatch'
10 |
11 | /// A value that may become determined (or "filled") at some point in the
[14/24] Compiling Deferred FutureIgnore.swift
/host/spi-builder-workspace/Sources/Deferred/Deferred.swift:9:8: error: no such module 'Dispatch'
7 | //
8 |
9 | import Dispatch
| `- error: no such module 'Dispatch'
10 |
11 | /// A value that may become determined (or "filled") at some point in the
[15/24] Compiling Deferred Future.swift
/host/spi-builder-workspace/Sources/Deferred/Deferred.swift:9:8: error: no such module 'Dispatch'
7 | //
8 |
9 | import Dispatch
| `- error: no such module 'Dispatch'
10 |
11 | /// A value that may become determined (or "filled") at some point in the
[16/24] Compiling Deferred FutureAndThen.swift
/host/spi-builder-workspace/Sources/Deferred/Deferred.swift:9:8: error: no such module 'Dispatch'
7 | //
8 |
9 | import Dispatch
| `- error: no such module 'Dispatch'
10 |
11 | /// A value that may become determined (or "filled") at some point in the
[17/24] Compiling Deferred FutureAsync.swift
/host/spi-builder-workspace/Sources/Deferred/Deferred.swift:9:8: error: no such module 'Dispatch'
7 | //
8 |
9 | import Dispatch
| `- error: no such module 'Dispatch'
10 |
11 | /// A value that may become determined (or "filled") at some point in the
[18/24] Compiling Deferred Promise.swift
/host/spi-builder-workspace/Sources/Deferred/Deferred.swift:9:8: error: no such module 'Dispatch'
7 | //
8 |
9 | import Dispatch
| `- error: no such module 'Dispatch'
10 |
11 | /// A value that may become determined (or "filled") at some point in the
[19/24] Compiling Deferred Protected.swift
/host/spi-builder-workspace/Sources/Deferred/Deferred.swift:9:8: error: no such module 'Dispatch'
7 | //
8 |
9 | import Dispatch
| `- error: no such module 'Dispatch'
10 |
11 | /// A value that may become determined (or "filled") at some point in the
[20/24] Compiling Deferred FutureUpon.swift
/host/spi-builder-workspace/Sources/Deferred/Deferred.swift:9:8: error: no such module 'Dispatch'
7 | //
8 |
9 | import Dispatch
| `- error: no such module 'Dispatch'
10 |
11 | /// A value that may become determined (or "filled") at some point in the
[21/24] Compiling Deferred Locking.swift
/host/spi-builder-workspace/Sources/Deferred/Deferred.swift:9:8: error: no such module 'Dispatch'
7 | //
8 |
9 | import Dispatch
| `- error: no such module 'Dispatch'
10 |
11 | /// A value that may become determined (or "filled") at some point in the
[22/24] Compiling Deferred DeferredVariant.swift
/host/spi-builder-workspace/Sources/Deferred/Deferred.swift:9:8: error: no such module 'Dispatch'
7 | //
8 |
9 | import Dispatch
| `- error: no such module 'Dispatch'
10 |
11 | /// A value that may become determined (or "filled") at some point in the
[23/24] Compiling Deferred Executor.swift
/host/spi-builder-workspace/Sources/Deferred/Deferred.swift:9:8: error: no such module 'Dispatch'
7 | //
8 |
9 | import Dispatch
| `- error: no such module 'Dispatch'
10 |
11 | /// A value that may become determined (or "filled") at some point in the
[24/24] Compiling Deferred ExistentialFuture.swift
/host/spi-builder-workspace/Sources/Deferred/Deferred.swift:9:8: error: no such module 'Dispatch'
7 | //
8 |
9 | import Dispatch
| `- error: no such module 'Dispatch'
10 |
11 | /// A value that may become determined (or "filled") at some point in the
BUILD FAILURE 6.3 wasm