Principle – Build Information – Swift Package Index

Build Information

Failed to build Principle, reference 2.0.0 (3a14a1), with Swift 6.4 for macOS (SPM) on 23 Sep 2026 10:26:06 UTC.

Build Command

env DEVELOPER_DIR=/Applications/Xcode-27.0.0-Release.Candidate.app xcrun swift build --arch arm64

Build Log

========================================
RunAll
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Builder version: 5.1.0
Interrupt handler set up.
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Checkout
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Clone URL: https://github.com/NSFatalError/Principle.git
Reference: 2.0.0
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/NSFatalError/Principle
 * tag               2.0.0      -> FETCH_HEAD
HEAD is now at 3a14a1f Prepared package for Swift 6.2 (#12)
Cloned https://github.com/NSFatalError/Principle.git
Revision (git rev-parse @):
3a14a1f47a3b4ef1df35a204e0aefc15024b9b0a
SPI manifest file found: $PWD/.spi.yml
SUCCESS checkout https://github.com/NSFatalError/Principle.git at 2.0.0
========================================
Build
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Selected platform:         macosSpm
Swift version:             6.4
Building package at path:  $PWD
https://github.com/NSFatalError/Principle.git
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-27.0.0-Release.Candidate.app xcrun swift build --arch arm64
Building for debugging...
[Pre-planning 1 / 182]
[Planning deferred tasks]
[33 / 60]
[35 / 62] PrincipleConcurrency
[42 / 69] PrincipleConcurrency
error: SwiftCompile normal arm64 /Users/admin/builder/spi-builder-workspace/Sources/PrincipleConcurrency/SingleUseTransfer.swift failed with a nonzero exit code. Command line:     cd /Users/admin/builder
    builtin-SwiftPerFileCompile SingleUseTransfer.swift
/Users/admin/builder/spi-builder-workspace/Sources/PrincipleConcurrency/SingleUseTransfer.swift:86:20: [1;31merror: [1;39mreturning 'wrapped' as a 'sending' result risks causing data races[0;0m [#]8;;https://docs.swift.org/compiler/documentation/diagnostics/region-isolation\RegionIsolation]8;;\]
[0;36m84 |[0;0m         case let .some(wrapped):
[0;36m85 |[0;0m             self = .init()
[0;36m86 |[0;0m             return wrapped
   [0;36m|[0;0m                    |- [1;31merror: [1;39mreturning 'wrapped' as a 'sending' result risks causing data races[0;0m [#]8;;https://docs.swift.org/compiler/documentation/diagnostics/region-isolation\RegionIsolation]8;;\]
   [0;36m|[0;0m                    `- [1;39mnote: [1;39mreturning 'wrapped' risks causing data races since the caller assumes that 'wrapped' can be safely sent to other isolation domains[0;0m
[0;36m87 |[0;0m         }
[0;36m88 |[0;0m     }
[#RegionIsolation]: <https://docs.swift.org/compiler/documentation/diagnostics/region-isolation>
Failed frontend command:
/Applications/Xcode-27.0.0-Release.Candidate.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift-frontend -frontend -c /Users/admin/builder/spi-builder-workspace/Sources/PrincipleConcurrency/DeadlineExceededError.swift -primary-file /Users/admin/builder/spi-builder-workspace/Sources/PrincipleConcurrency/SingleUseTransfer.swift /Users/admin/builder/spi-builder-workspace/Sources/PrincipleConcurrency/TaskTimeLimit.swift /Users/admin/builder/spi-builder-workspace/Sources/PrincipleConcurrency/TimeoutError.swift -emit-dependencies-path /Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/Principle.build/Debug/PrincipleConcurrency-t.build/Objects-normal/arm64/SingleUseTransfer.d -emit-const-values-path /Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/Principle.build/Debug/PrincipleConcurrency-t.build/Objects-normal/arm64/SingleUseTransfer.swiftconstvalues -emit-reference-dependencies-path /Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/Principle.build/Debug/PrincipleConcurrency-t.build/Objects-normal/arm64/SingleUseTransfer.swiftdeps -serialize-diagnostics-path /Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/Principle.build/Debug/PrincipleConcurrency-t.build/Objects-normal/arm64/SingleUseTransfer.dia -target arm64-apple-macos15.0 -disable-cross-import-overlay-search -load-resolved-plugin /Applications/Xcode-27.0.0-Release.Candidate.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/lib/swift/host/plugins/libSwiftMacros.dylib\#/Applications/Xcode-27.0.0-Release.Candidate.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/bin/swift-plugin-server\#SwiftMacros -disable-implicit-swift-modules -Xcc -fno-implicit-modules -Xcc -fno-implicit-module-maps -explicit-swift-module-map-file /Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/Principle.build/Debug/PrincipleConcurrency-t.build/Objects-normal/arm64/PrincipleConcurrency-dependencies-1.json -Xllvm -aarch64-use-tbi -enable-objc-interop -stack-check -sdk /Applications/Xcode-27.0.0-Release.Candidate.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX27.0.sdk -I /Users/admin/builder/spi-builder-workspace/.build/out/Products/Debug -Isystem /Applications/Xcode-27.0.0-Release.Candidate.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/lib -F /Users/admin/builder/spi-builder-workspace/.build/out/Products/Debug -F /Applications/Xcode-27.0.0-Release.Candidate.app/Contents/Developer/Platforms/MacOSX.platform/Developer/Library/Frameworks -module-cache-path /Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/SwiftExplicitPrecompiledModules -color-diagnostics -Xcc -fcolor-diagnostics -enable-testing -g -debug-info-format\=dwarf -dwarf-version\=5 -swift-version 6 -Onone -D SWIFT_PACKAGE -D DEBUG -D SWIFT_MODULE_RESOURCE_BUNDLE_UNAVAILABLE -D Xcode -serialize-debugging-options -enable-upcoming-feature ExistentialAny -enable-upcoming-feature MemberImportVisibility -enable-upcoming-feature NonisolatedNonsendingByDefault -enable-experimental-feature DebugDescriptionMacro -empty-abi-descriptor -validate-clang-modules-once -clang-build-session-file /Users/admin/builder/spi-builder-workspace/.build/out/ModuleCache.noindex/Session.modulevalidation -Xcc -working-directory -Xcc /Users/admin/builder -enable-anonymous-context-mangled-names -file-compilation-dir /Users/admin/builder -Xcc -D_LIBCPP_HARDENING_MODE\=_LIBCPP_HARDENING_MODE_DEBUG -Xcc -ivfsstatcache -Xcc /Users/admin/builder/spi-builder-workspace/.build/out/SDKStatCaches.noindex/macosx27.0-26A425-80c5bbf1d171475443272936d42f90a36a22442a12e9d48fe1a705f55a1adfc4.sdkstatcache -Xcc -fmodules-prune-interval\=86400 -Xcc -fmodules-prune-after\=345600 -Xcc -I/Users/admin/builder/spi-builder-workspace/.build/out/Products/Debug/include -Xcc -I/Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/Principle.build/Debug/PrincipleConcurrency-t.build/DerivedSources-normal/arm64 -Xcc -I/Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/Principle.build/Debug/PrincipleConcurrency-t.build/DerivedSources/arm64 -Xcc -I/Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/Principle.build/Debug/PrincipleConcurrency-t.build/DerivedSources -Xcc -DSWIFT_PACKAGE -Xcc -DDEBUG\=1 -no-auto-bridging-header-chaining -module-name PrincipleConcurrency -package-name spi_builder_workspace -const-gather-protocols-file /Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/Principle.build/Debug/PrincipleConcurrency-t.build/Objects-normal/arm64/PrincipleConcurrency_const_extract_protocols.json -disable-clang-spi -clang-target arm64-apple-macos27.0 -target-sdk-version 27.0 -target-sdk-name macosx27.0 -in-process-plugin-server-path /Applications/Xcode-27.0.0-Release.Candidate.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift/host/libSwiftInProcPluginServer.dylib -parse-as-library -o /Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/Principle.build/Debug/PrincipleConcurrency-t.build/Objects-normal/arm64/SingleUseTransfer.o -debug-module-path /Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/Principle.build/Debug/PrincipleConcurrency-t.build/Objects-normal/arm64/PrincipleConcurrency.swiftmodule -index-unit-output-path /Principle.build/Debug/PrincipleConcurrency-t.build/Objects-normal/arm64/SingleUseTransfer.o -index-store-path /Users/admin/builder/spi-builder-workspace/.build/out -index-system-modules
error: Build failed
BUILD FAILURE 6.4 macosSpm