Deferred – Build Information – Swift Package Index

Build Information

Failed to build Deferred, reference develop (c82b9e), with Swift 6.4 for Wasm on 18 Sep 2026 15:21:54 UTC.

Build Command

bash -c docker run --pull=always --rm -v "checkouts-54344845-0":/host -w "$PWD" -e JAVA_HOME="/root/.sdkman/candidates/java/current" -e SPI_BUILD="1" -e SPI_PROCESSING="1" registry.gitlab.com/saguaro1/spi-images:wasm-6.4-latest swift build --swift-sdk swift-6.4.x-DEVELOPMENT-SNAPSHOT-2026-09-04-a_wasm 2>&1

Build Log

========================================
RunAll
========================================
Builder version: 5.1.0
Interrupt handler set up.
========================================
Checkout
========================================
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
========================================
Build
========================================
Selected platform:         wasm
Swift version:             6.4
Building package at path:  $PWD
https://github.com/bignerdranch/Deferred.git
Running build ...
bash -c docker run --pull=always --rm -v "checkouts-54344845-0":/host -w "$PWD" -e JAVA_HOME="/root/.sdkman/candidates/java/current" -e SPI_BUILD="1" -e SPI_PROCESSING="1" registry.gitlab.com/saguaro1/spi-images:wasm-6.4-latest swift build --swift-sdk swift-6.4.x-DEVELOPMENT-SNAPSHOT-2026-09-04-a_wasm 2>&1
wasm-6.4-latest: Pulling from saguaro1/spi-images
Digest: sha256:4328fdb43c680d205c1d6761b1e3267aa38277eefdda9ddfb17b6a0f1a77857a
Status: Image is up to date for registry.gitlab.com/saguaro1/spi-images:wasm-6.4-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.
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...
[Pre-planning 1 / 125]
error: SwiftCompile normal wasm32 failed with a nonzero exit code. Command line:     cd /host

/host/spi-builder-workspace/Sources/Deferred/Atomics.swift:19:22: [1;33mwarning: [1;39msafely use '@_implementationOnly' without library evolution by setting '-enable-experimental-feature CheckImplementationOnly' for 'Deferred'[0;0m [#]8;;https://docs.swift.org/compiler/documentation/diagnostics/implementation-only-deprecated\ImplementationOnlyDeprecated]8;;\]
 [0;36m17 |[0;0m
 [0;36m18 |[0;0m #if SWIFT_PACKAGE || (canImport(CAtomics) && !FORCE_PLAYGROUND_COMPATIBILITY)
 [0;36m19 |[0;0m @_implementationOnly import CAtomics
    [0;36m|[0;0m                      `- [1;33mwarning: [1;39msafely use '@_implementationOnly' without library evolution by setting '-enable-experimental-feature CheckImplementationOnly' for 'Deferred'[0;0m [#]8;;https://docs.swift.org/compiler/documentation/diagnostics/implementation-only-deprecated\ImplementationOnlyDeprecated]8;;\]
 [0;36m20 |[0;0m #elseif canImport(Darwin)
 [0;36m21 |[0;0m #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: [1;31merror: [1;39mno such module 'Dispatch'[0;0m
 [0;36m7 |[0;0m //
 [0;36m8 |[0;0m
 [0;36m9 |[0;0m import Dispatch
   [0;36m|[0;0m        `- [1;31merror: [1;39mno such module 'Dispatch'[0;0m
[0;36m10 |[0;0m
[0;36m11 |[0;0m /// A value that may become determined (or "filled") at some point in the
[#ImplementationOnlyDeprecated]: <https://docs.swift.org/compiler/documentation/diagnostics/implementation-only-deprecated>
Failed frontend command:
/usr/bin/swift-frontend -frontend -emit-module -experimental-skip-non-inlinable-function-bodies-without-types /host/spi-builder-workspace/Sources/Deferred/Atomics.swift /host/spi-builder-workspace/Sources/Deferred/Deferred.swift /host/spi-builder-workspace/Sources/Deferred/DeferredQueue.swift /host/spi-builder-workspace/Sources/Deferred/DeferredVariant.swift /host/spi-builder-workspace/Sources/Deferred/Executor.swift /host/spi-builder-workspace/Sources/Deferred/ExistentialFuture.swift /host/spi-builder-workspace/Sources/Deferred/Future.swift /host/spi-builder-workspace/Sources/Deferred/FutureAndThen.swift /host/spi-builder-workspace/Sources/Deferred/FutureAsync.swift /host/spi-builder-workspace/Sources/Deferred/FutureCollections.swift /host/spi-builder-workspace/Sources/Deferred/FutureComposition.swift /host/spi-builder-workspace/Sources/Deferred/FutureEveryMap.swift /host/spi-builder-workspace/Sources/Deferred/FutureIgnore.swift /host/spi-builder-workspace/Sources/Deferred/FutureMap.swift /host/spi-builder-workspace/Sources/Deferred/FuturePeek.swift /host/spi-builder-workspace/Sources/Deferred/FutureUpon.swift /host/spi-builder-workspace/Sources/Deferred/Locking.swift /host/spi-builder-workspace/Sources/Deferred/Promise.swift /host/spi-builder-workspace/Sources/Deferred/Protected.swift -target wasm32-unknown-wasip1 -disable-objc-interop -sdk /root/.swiftpm/swift-sdks/swift-6.4.x-DEVELOPMENT-SNAPSHOT-2026-09-04-a_wasm.artifactbundle/swift-6.4.x-DEVELOPMENT-SNAPSHOT-2026-09-04-a_wasm/wasm32-unknown-wasip1/WASI.sdk -sysroot /root/.swiftpm/swift-sdks/swift-6.4.x-DEVELOPMENT-SNAPSHOT-2026-09-04-a_wasm.artifactbundle/swift-6.4.x-DEVELOPMENT-SNAPSHOT-2026-09-04-a_wasm/wasm32-unknown-wasip1/WASI.sdk -I /host/spi-builder-workspace/.build/out/Products/Debug-webassembly-wasm32 -module-cache-path /host/spi-builder-workspace/.build/out/ModuleCache.noindex -color-diagnostics -Xcc -fcolor-diagnostics -enable-testing -g -debug-info-format\=dwarf -dwarf-version\=4 -swift-version 5 -Onone -D SWIFT_PACKAGE -D DEBUG -D SWIFT_MODULE_RESOURCE_BUNDLE_UNAVAILABLE -D Xcode -serialize-debugging-options -enable-experimental-feature DebugDescriptionMacro -empty-abi-descriptor -external-plugin-path /usr/lib/swift/host/plugins/testing\#/usr/bin/swift-plugin-server -validate-clang-modules-once -clang-build-session-file /host/spi-builder-workspace/.build/out/ModuleCache.noindex/Session.modulevalidation -Xcc -working-directory -Xcc /host -resource-dir /root/.swiftpm/swift-sdks/swift-6.4.x-DEVELOPMENT-SNAPSHOT-2026-09-04-a_wasm.artifactbundle/swift-6.4.x-DEVELOPMENT-SNAPSHOT-2026-09-04-a_wasm/wasm32-unknown-wasip1/swift.xctoolchain/usr/lib/swift_static -use-static-resource-dir -enable-anonymous-context-mangled-names -file-compilation-dir /host -Xcc -resource-dir -Xcc /root/.swiftpm/swift-sdks/swift-6.4.x-DEVELOPMENT-SNAPSHOT-2026-09-04-a_wasm.artifactbundle/swift-6.4.x-DEVELOPMENT-SNAPSHOT-2026-09-04-a_wasm/wasm32-unknown-wasip1/swift.xctoolchain/usr/lib/swift_static/clang -Xcc -fmodule-map-file\=/host/spi-builder-workspace/Sources/CAtomics/include/module.modulemap -Xcc -D_LIBCPP_HARDENING_MODE\=_LIBCPP_HARDENING_MODE_DEBUG -Xcc -fmodules-prune-interval\=86400 -Xcc -fmodules-prune-after\=345600 -Xcc -I/host/spi-builder-workspace/Sources/CAtomics/include -Xcc -I/host/spi-builder-workspace/.build/out/Products/Debug-webassembly-wasm32/include -Xcc -I/host/spi-builder-workspace/.build/out/Intermediates.noindex/Deferred.build/Debug-webassembly-wasm32/Deferred-t.build/DerivedSources-normal/wasm32 -Xcc -I/host/spi-builder-workspace/.build/out/Intermediates.noindex/Deferred.build/Debug-webassembly-wasm32/Deferred-t.build/DerivedSources/wasm32 -Xcc -I/host/spi-builder-workspace/.build/out/Intermediates.noindex/Deferred.build/Debug-webassembly-wasm32/Deferred-t.build/DerivedSources -Xcc -DSWIFT_PACKAGE -Xcc -DDEBUG\=1 -no-auto-bridging-header-chaining -module-name Deferred -const-gather-protocols-file /host/spi-builder-workspace/.build/out/Intermediates.noindex/Deferred.build/Debug-webassembly-wasm32/Deferred-t.build/Objects-normal/wasm32/Deferred_const_extract_protocols.json -in-process-plugin-server-path /usr/lib/swift/host/libSwiftInProcPluginServer.so -plugin-path /usr/lib/swift/host/plugins -plugin-path /usr/local/lib/swift/host/plugins -emit-module-doc-path /host/spi-builder-workspace/.build/out/Intermediates.noindex/Deferred.build/Debug-webassembly-wasm32/Deferred-t.build/Objects-normal/wasm32/Modules/Deferred.swiftdoc -emit-module-source-info-path /host/spi-builder-workspace/.build/out/Intermediates.noindex/Deferred.build/Debug-webassembly-wasm32/Deferred-t.build/Objects-normal/wasm32/Modules/Deferred.swiftsourceinfo -emit-objc-header-path /host/spi-builder-workspace/.build/out/Intermediates.noindex/Deferred.build/Debug-webassembly-wasm32/Deferred-t.build/Objects-normal/wasm32/Deferred-Swift.h -serialize-diagnostics-path /host/spi-builder-workspace/.build/out/Intermediates.noindex/Deferred.build/Debug-webassembly-wasm32/Deferred-t.build/Objects-normal/wasm32/Deferred-primary-emit-module.dia -emit-dependencies-path /host/spi-builder-workspace/.build/out/Intermediates.noindex/Deferred.build/Debug-webassembly-wasm32/Deferred-t.build/Objects-normal/wasm32/Deferred-primary-emit-module.d -parse-as-library -o /host/spi-builder-workspace/.build/out/Intermediates.noindex/Deferred.build/Debug-webassembly-wasm32/Deferred-t.build/Objects-normal/wasm32/Modules/Deferred.swiftmodule
[35 / 50] Deferred
error: Build failed
BUILD FAILURE 6.4 wasm