Swift Package IndexBuild Information
Failed to build Deferred with Swift 6.3 for visionOS using Xcode 26.4.
Build Command
Build command unavailableBuild Log
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RunAll
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Builder version: 4.70.0
Interrupt handler set up.
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Checkout
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Clone URL: https://github.com/bignerdranch/Deferred.git
Reference: develop
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
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: visionOS
Swift version: 6.3
Building package at path: $PWD
https://github.com/bignerdranch/Deferred.git
Command line invocation:
/Applications/Xcode-26.4.0.app/Contents/Developer/usr/bin/xcodebuild -IDEClonedSourcePackagesDirPathOverride=/Users/admin/builder/spi-builder-workspace/.dependencies -resolvePackageDependencies
resolved source packages:
{
"dependencies" : [
],
"manifest_display_name" : "Deferred",
"name" : "Deferred",
"path" : "/Users/admin/builder/spi-builder-workspace",
"platforms" : [
{
"name" : "macos",
"version" : "10.12"
},
{
"name" : "ios",
"version" : "10.0"
},
{
"name" : "watchos",
"version" : "3.0"
},
{
"name" : "tvos",
"version" : "10.0"
}
],
"products" : [
{
"name" : "Deferred",
"targets" : [
"Deferred",
"Task"
],
"type" : {
"library" : [
"automatic"
]
}
}
],
"targets" : [
{
"c99name" : "TaskTests",
"module_type" : "SwiftTarget",
"name" : "TaskTests",
"path" : "Tests/TaskTests",
"sources" : [
"AllTestsCommon.swift",
"TaskAsyncTests.swift",
"TaskCompositionTests.swift",
"TaskComprehensiveTests.swift",
"TaskProgressTests.swift",
"TaskProtocolTests.swift",
"TaskResultTests.swift",
"TaskTests.swift"
],
"target_dependencies" : [
"Deferred",
"Task"
],
"type" : "test"
},
{
"c99name" : "Task",
"module_type" : "SwiftTarget",
"name" : "Task",
"path" : "Sources/Task",
"product_memberships" : [
"Deferred"
],
"sources" : [
"Either.swift",
"ExistentialTask.swift",
"Progress+ExplicitComposition.swift",
"Progress+Future.swift",
"Task.swift",
"TaskAndThen.swift",
"TaskAsync.swift",
"TaskChain.swift",
"TaskCollections.swift",
"TaskComposition.swift",
"TaskEveryMap.swift",
"TaskFallback.swift",
"TaskIgnore.swift",
"TaskMap.swift",
"TaskPromise.swift",
"TaskRecovery.swift",
"TaskResult.swift",
"TaskUpon.swift"
],
"target_dependencies" : [
"Deferred",
"CAtomics"
],
"type" : "library"
},
{
"c99name" : "DeferredTests",
"module_type" : "SwiftTarget",
"name" : "DeferredTests",
"path" : "Tests/DeferredTests",
"sources" : [
"AllTestsCommon.swift",
"DeferredTests.swift",
"ExistentialFutureTests.swift",
"FilledDeferredTests.swift",
"FutureAsyncTests.swift",
"FutureCustomExecutorTests.swift",
"FutureIgnoreTests.swift",
"FutureTests.swift",
"ObjectDeferredTests.swift",
"PerformanceTests.swift",
"ProtectedTests.swift",
"SwiftBugTests.swift"
],
"target_dependencies" : [
"Deferred"
],
"type" : "test"
},
{
"c99name" : "Deferred",
"module_type" : "SwiftTarget",
"name" : "Deferred",
"path" : "Sources/Deferred",
"product_memberships" : [
"Deferred"
],
"sources" : [
"Atomics.swift",
"Deferred.swift",
"DeferredQueue.swift",
"DeferredVariant.swift",
"Executor.swift",
"ExistentialFuture.swift",
"Future.swift",
"FutureAndThen.swift",
"FutureAsync.swift",
"FutureCollections.swift",
"FutureComposition.swift",
"FutureEveryMap.swift",
"FutureIgnore.swift",
"FutureMap.swift",
"FuturePeek.swift",
"FutureUpon.swift",
"Locking.swift",
"Promise.swift",
"Protected.swift"
],
"target_dependencies" : [
"CAtomics"
],
"type" : "library"
},
{
"c99name" : "CAtomics",
"module_type" : "ClangTarget",
"name" : "CAtomics",
"path" : "Sources/CAtomics",
"product_memberships" : [
"Deferred"
],
"sources" : [
"Empty.c"
],
"type" : "library"
}
],
"tools_version" : "5.1"
}
warning: 'spi-builder-workspace': Invalid Exclude '/Users/admin/builder/spi-builder-workspace/Tests/DeferredTests/Tests/AllTestsCommon.swift': File not found.
warning: 'spi-builder-workspace': Invalid Exclude '/Users/admin/builder/spi-builder-workspace/Tests/TaskTests/Tests/AllTestsCommon.swift': File not found.
{
"project" : {
"configurations" : [
"Debug",
"Release"
],
"name" : "Deferred",
"schemes" : [
"Deferred"
],
"targets" : [
"Deferred",
"DeferredTests"
]
}
}
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-26.4.0.app xcrun xcodebuild -IDEClonedSourcePackagesDirPathOverride=$PWD/.dependencies -skipMacroValidation -skipPackagePluginValidation -derivedDataPath $PWD/.derivedData build -scheme Deferred -destination generic/platform=xrOS
Command line invocation:
/Applications/Xcode-26.4.0.app/Contents/Developer/usr/bin/xcodebuild -IDEClonedSourcePackagesDirPathOverride=/Users/admin/builder/spi-builder-workspace/.dependencies -skipMacroValidation -skipPackagePluginValidation -derivedDataPath /Users/admin/builder/spi-builder-workspace/.derivedData build -scheme Deferred -destination generic/platform=xrOS
2026-04-21 04:50:03.026 xcodebuild[618:3718] Writing error result bundle to /var/folders/xq/y_g06wb113726d38xsyx71_h0000gn/T/ResultBundle_2026-21-04_04-50-0003.xcresult
xcodebuild: error: Unable to find a destination matching the provided destination specifier:
{ generic:1, platform:xrOS }
Available destinations for the "Deferred" scheme:
{ platform:macOS, arch:arm64, id:23b51906d5da5ffc3e99f6096dedbe9b096f0f25, name:My Mac }
{ platform:macOS, arch:x86_64, id:23b51906d5da5ffc3e99f6096dedbe9b096f0f25, name:My Mac }
{ platform:macOS, arch:arm64, variant:Mac Catalyst, id:23b51906d5da5ffc3e99f6096dedbe9b096f0f25, name:My Mac }
{ platform:macOS, arch:x86_64, variant:Mac Catalyst, id:23b51906d5da5ffc3e99f6096dedbe9b096f0f25, name:My Mac }
{ platform:macOS, arch:arm64, variant:Designed for [iPad,iPhone], id:23b51906d5da5ffc3e99f6096dedbe9b096f0f25, name:My Mac }
{ platform:iOS, id:dvtdevice-DVTiPhonePlaceholder-iphoneos:placeholder, name:Any iOS Device }
{ platform:iOS Simulator, id:dvtdevice-DVTiOSDeviceSimulatorPlaceholder-iphonesimulator:placeholder, name:Any iOS Simulator Device }
{ platform:macOS, name:Any Mac }
{ platform:macOS, variant:Mac Catalyst, name:Any Mac }
{ platform:tvOS, id:dvtdevice-DVTiOSDevicePlaceholder-appletvos:placeholder, name:Any tvOS Device }
{ platform:tvOS Simulator, id:dvtdevice-DVTiOSDeviceSimulatorPlaceholder-appletvsimulator:placeholder, name:Any tvOS Simulator Device }
{ platform:watchOS, id:dvtdevice-DVTiOSDevicePlaceholder-watchos:placeholder, name:Any watchOS Device }
{ platform:watchOS Simulator, id:dvtdevice-DVTiOSDeviceSimulatorPlaceholder-watchsimulator:placeholder, name:Any watchOS Simulator Device }
{ platform:tvOS Simulator, arch:arm64, id:EB41DD69-50EA-4A70-A0F3-B1F466EA63FD, OS:26.4, name:Apple TV }
{ platform:tvOS Simulator, arch:arm64, id:18F5F773-9DDF-4D28-BE08-2EE01B9FE04D, OS:26.4, name:Apple TV 4K (3rd generation) }
{ platform:tvOS Simulator, arch:arm64, id:8753D4DB-0EAD-4642-AE61-CF841A16BD50, OS:26.4, name:Apple TV 4K (3rd generation) (at 1080p) }
{ platform:visionOS Simulator, arch:arm64, variant:Designed for [iPad,iPhone], id:0A65DF41-4C5A-42D8-80FB-C7AD911E0B72, OS:26.4, name:Apple Vision Pro }
{ platform:watchOS Simulator, arch:arm64, id:21136BB6-0BE4-4F7C-B65A-9D5D377866B7, OS:26.4, name:Apple Watch SE 3 (40mm) }
{ platform:watchOS Simulator, arch:arm64, id:5F5B3141-7CE9-4C68-BDEF-F50E137CB489, OS:26.4, name:Apple Watch SE 3 (44mm) }
{ platform:watchOS Simulator, arch:arm64, id:D6424336-ADAE-465D-8F02-54AB28C2A306, OS:26.4, name:Apple Watch Series 11 (42mm) }
{ platform:watchOS Simulator, arch:arm64, id:EA70B146-8CB0-4192-8C25-04DF59477105, OS:26.4, name:Apple Watch Series 11 (46mm) }
{ platform:watchOS Simulator, arch:arm64, id:C12BDEDA-46B1-43B5-A69B-7029487C2761, OS:26.4, name:Apple Watch Ultra 3 (49mm) }
{ platform:iOS Simulator, arch:arm64, id:ED6D44FB-E2CB-4753-A0FD-FD31596FEC80, OS:26.4, name:iPad (A16) }
{ platform:iOS Simulator, arch:arm64, id:BCEC8334-6B95-4648-94D6-7CF60E7EFD82, OS:26.4, name:iPad Air 11-inch (M4) }
{ platform:iOS Simulator, arch:arm64, id:45BB79BC-7646-4F19-8D06-DCBD411E98C0, OS:26.4, name:iPad Air 13-inch (M4) }
{ platform:iOS Simulator, arch:arm64, id:1C3FCF57-F496-44A8-91C7-42D1FBB47B6C, OS:26.4, name:iPad Pro 11-inch (M5) }
{ platform:iOS Simulator, arch:arm64, id:78ECA907-6BCE-4638-957D-C2669C42F4B7, OS:26.4, name:iPad Pro 13-inch (M5) }
{ platform:iOS Simulator, arch:arm64, id:4E377BD7-D244-4C67-AA71-C9334B19DD83, OS:26.4, name:iPad mini (A17 Pro) }
{ platform:iOS Simulator, arch:arm64, id:5E07715F-630C-4684-A995-1B2EE7BD6598, OS:26.4, name:iPhone 17 }
{ platform:iOS Simulator, arch:arm64, id:C413B30A-952C-4663-B1C5-64938D82C4AB, OS:26.4, name:iPhone 17 Pro }
{ platform:iOS Simulator, arch:arm64, id:407D5276-A344-478A-B9C8-EB27CE780CB6, OS:26.4, name:iPhone 17 Pro Max }
{ platform:iOS Simulator, arch:arm64, id:720F5E9E-7490-4565-8AC1-7A6A63551BBC, OS:26.4, name:iPhone 17e }
{ platform:iOS Simulator, arch:arm64, id:51B1D6CF-85BF-4B9E-ACCF-FD3A9AD197FF, OS:26.4, name:iPhone Air }
INFRASTRUCTURE ERROR (status: destinationUnavailable