Scientist – Build Information – Swift Package Index

Build Information

Failed to build Scientist, reference 1.0.0 (1bb94e), with Swift 6.4 for Wasm on 27 Sep 2026 18:59:32 UTC.

Build Command

bash -c docker run --pull=always --rm -v "checkouts-54344844-0":/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/junkpiano/scientist.git
Reference: 1.0.0
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/junkpiano/scientist
 * tag               1.0.0      -> FETCH_HEAD
HEAD is now at 1bb94ea Point the installation example at 1.0.0 (#31)
Cloned https://github.com/junkpiano/scientist.git
Revision (git rev-parse @):
1bb94ea8dad441c795021aa3da48f485d3f65c9d
SUCCESS checkout https://github.com/junkpiano/scientist.git at 1.0.0
========================================
Build
========================================
Selected platform:         wasm
Swift version:             6.4
Building package at path:  $PWD
https://github.com/junkpiano/scientist.git
Running build ...
bash -c docker run --pull=always --rm -v "checkouts-54344844-0":/host -w "$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': /host/spi-builder-workspace/Package.swift:10:27: warning: 'v4' is deprecated: watchOS 9.0 is the oldest supported version [#DeprecatedDeclaration]
 8 |                 .iOS(.v12),
 9 |                 .tvOS(.v12),
10 |                 .watchOS(.v4)],
   |                           `- warning: 'v4' is deprecated: watchOS 9.0 is the oldest supported version [#DeprecatedDeclaration]
11 |     products: [
12 |         // Products define the executables and libraries produced by a package, and make them visible to other packages.
[#DeprecatedDeclaration]: <https://docs.swift.org/compiler/documentation/diagnostics/deprecated-declaration>
Building for debugging...
[Planning deferred tasks]
[26 / 34] Scientist
[31 / 34] Scientist
/host/spi-builder-workspace/Sources/Scientist/MismatchError.swift:62:30: [1;33mwarning: [1;39mcapture of non-Sendable type 'T.Type' in an isolated closure[0;0m [#]8;;https://docs.swift.org/compiler/documentation/diagnostics/sendable-metatypes\SendableMetatypes]8;;\]
[0;36m60 |[0;0m       Mismatch(
[0;36m61 |[0;0m         name: candidate.name,
[0;36m62 |[0;0m         control: control.map(MismatchError.describe) ?? "had no control",
   [0;36m|[0;0m                              `- [1;33mwarning: [1;39mcapture of non-Sendable type 'T.Type' in an isolated closure[0;0m [#]8;;https://docs.swift.org/compiler/documentation/diagnostics/sendable-metatypes\SendableMetatypes]8;;\]
[0;36m63 |[0;0m         candidate: MismatchError.describe(candidate))
[0;36m64 |[0;0m     }
[#SendableMetatypes]: <https://docs.swift.org/compiler/documentation/diagnostics/sendable-metatypes>
error: SwiftCompile normal wasm32 /host/spi-builder-workspace/Sources/Scientist/Observation.swift failed with a nonzero exit code. Command line:     cd /host
    builtin-SwiftPerFileCompile Observation.swift
/host/spi-builder-workspace/Sources/Scientist/Observation.swift:72:17: [1;31merror: [1;39mcannot find 'DispatchTime' in scope[0;0m
 [0;36m70 |[0;0m
 [0;36m71 |[0;0m     now = Date()
 [0;36m72 |[0;0m     let start = [4;39mDispatchTime[0;0m.now()
    [0;36m|[0;0m                 `- [1;31merror: [1;39mcannot find 'DispatchTime' in scope[0;0m
 [0;36m73 |[0;0m     do {
 [0;36m74 |[0;0m       value = try block()
/host/spi-builder-workspace/Sources/Scientist/Observation.swift:78:15: [1;31merror: [1;39mcannot find 'DispatchTime' in scope[0;0m
 [0;36m76 |[0;0m       self.error = error
 [0;36m77 |[0;0m     }
 [0;36m78 |[0;0m     let end = [4;39mDispatchTime[0;0m.now()
    [0;36m|[0;0m               `- [1;31merror: [1;39mcannot find 'DispatchTime' in scope[0;0m
 [0;36m79 |[0;0m
 [0;36m80 |[0;0m     during = Double(end.uptimeNanoseconds - start.uptimeNanoseconds) / 1000000.0
Failed frontend command:
/usr/bin/swift-frontend -frontend -c /host/spi-builder-workspace/Sources/Scientist/Constants.swift /host/spi-builder-workspace/Sources/Scientist/Error.swift /host/spi-builder-workspace/Sources/Scientist/Experiment.swift /host/spi-builder-workspace/Sources/Scientist/MismatchError.swift -primary-file /host/spi-builder-workspace/Sources/Scientist/Observation.swift /host/spi-builder-workspace/Sources/Scientist/Result.swift /host/spi-builder-workspace/Sources/Scientist/Scientist.swift -emit-dependencies-path /host/spi-builder-workspace/.build/out/Intermediates.noindex/Scientist.build/Debug-webassembly-wasm32/Scientist-t.build/Objects-normal/wasm32/Observation.d -emit-const-values-path /host/spi-builder-workspace/.build/out/Intermediates.noindex/Scientist.build/Debug-webassembly-wasm32/Scientist-t.build/Objects-normal/wasm32/Observation.swiftconstvalues -emit-reference-dependencies-path /host/spi-builder-workspace/.build/out/Intermediates.noindex/Scientist.build/Debug-webassembly-wasm32/Scientist-t.build/Objects-normal/wasm32/Observation.swiftdeps -serialize-diagnostics-path /host/spi-builder-workspace/.build/out/Intermediates.noindex/Scientist.build/Debug-webassembly-wasm32/Scientist-t.build/Objects-normal/wasm32/Observation.dia -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 6 -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 -D_LIBCPP_HARDENING_MODE\=_LIBCPP_HARDENING_MODE_DEBUG -Xcc -fmodules-prune-interval\=86400 -Xcc -fmodules-prune-after\=345600 -Xcc -I/host/spi-builder-workspace/.build/out/Products/Debug-webassembly-wasm32/include -Xcc -I/host/spi-builder-workspace/.build/out/Intermediates.noindex/Scientist.build/Debug-webassembly-wasm32/Scientist-t.build/DerivedSources-normal/wasm32 -Xcc -I/host/spi-builder-workspace/.build/out/Intermediates.noindex/Scientist.build/Debug-webassembly-wasm32/Scientist-t.build/DerivedSources/wasm32 -Xcc -I/host/spi-builder-workspace/.build/out/Intermediates.noindex/Scientist.build/Debug-webassembly-wasm32/Scientist-t.build/DerivedSources -Xcc -DSWIFT_PACKAGE -Xcc -DDEBUG\=1 -no-auto-bridging-header-chaining -module-name Scientist -package-name spi_builder_workspace -const-gather-protocols-file /host/spi-builder-workspace/.build/out/Intermediates.noindex/Scientist.build/Debug-webassembly-wasm32/Scientist-t.build/Objects-normal/wasm32/Scientist_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 -parse-as-library -o /host/spi-builder-workspace/.build/out/Intermediates.noindex/Scientist.build/Debug-webassembly-wasm32/Scientist-t.build/Objects-normal/wasm32/Observation.o -index-unit-output-path /Scientist.build/Debug-webassembly-wasm32/Scientist-t.build/Objects-normal/wasm32/Observation.o -index-store-path /host/spi-builder-workspace/.build/out -index-system-modules
error: Build failed
BUILD FAILURE 6.4 wasm