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Failed to build HorizonCalendar with Swift 6.1 for visionOS using Xcode 16.3.

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Build Log

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RunAll
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Builder version: 4.68.0
Interrupt handler set up.
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Checkout
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Clone URL: https://github.com/airbnb/HorizonCalendar.git
Reference: master
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/airbnb/HorizonCalendar
 * branch            master     -> FETCH_HEAD
 * [new branch]      master     -> origin/master
HEAD is now at 47e451e Fix README links
Cloned https://github.com/airbnb/HorizonCalendar.git
Revision (git rev-parse @):
47e451e840a6b849a0b0f136e4340f5834767ed2
SUCCESS checkout https://github.com/airbnb/HorizonCalendar.git at master
========================================
Build
========================================
Selected platform:         visionOS
Swift version:             6.1
Building package at path:  $PWD
https://github.com/airbnb/HorizonCalendar.git
https://github.com/airbnb/HorizonCalendar.git
{
  "dependencies" : [
    {
      "identity" : "swift",
      "requirement" : {
        "range" : [
          {
            "lower_bound" : "1.2.0",
            "upper_bound" : "2.0.0"
          }
        ]
      },
      "type" : "sourceControl",
      "url" : "https://github.com/airbnb/swift"
    }
  ],
  "manifest_display_name" : "HorizonCalendar",
  "name" : "HorizonCalendar",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
    {
      "name" : "ios",
      "version" : "12.0"
    }
  ],
  "products" : [
    {
      "name" : "HorizonCalendar",
      "targets" : [
        "HorizonCalendar"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "swift_languages_versions" : [
    "5"
  ],
  "targets" : [
    {
      "c99name" : "HorizonCalendarTests",
      "module_type" : "SwiftTarget",
      "name" : "HorizonCalendarTests",
      "path" : "Tests",
      "sources" : [
        "CalendarContentTests.swift",
        "DayHelperTests.swift",
        "DayOfWeekPositionTests.swift",
        "FrameProviderTests.swift",
        "HorizontalMonthsLayoutOptionsTests.swift",
        "ItemViewReuseManagerTests.swift",
        "LayoutItemTypeEnumeratorTests.swift",
        "MonthHelperTests.swift",
        "MonthRowTests.swift",
        "MonthTests.swift",
        "PaginationHelpersTests.swift",
        "ScreenPixelAlignmentTests.swift",
        "ScrollMetricsMutatorTests.swift",
        "SubviewsManagerTests.swift",
        "VisibleItemsProviderTests.swift"
      ],
      "target_dependencies" : [
        "HorizonCalendar"
      ],
      "type" : "test"
    },
    {
      "c99name" : "HorizonCalendar",
      "module_type" : "SwiftTarget",
      "name" : "HorizonCalendar",
      "path" : "Sources",
      "product_memberships" : [
        "HorizonCalendar"
      ],
      "sources" : [
        "Internal/CGFloat+MaxLayoutValue.swift",
        "Internal/Calendar+Helpers.swift",
        "Internal/CalendarScrollView.swift",
        "Internal/ColorViewRepresentable.swift",
        "Internal/Dictionary+MutatingValueForKey.swift",
        "Internal/DoubleLayoutPassHelpers.swift",
        "Internal/FrameProvider.swift",
        "Internal/Hasher+CGRect.swift",
        "Internal/ItemView.swift",
        "Internal/ItemViewReuseManager.swift",
        "Internal/LayoutItem.swift",
        "Internal/LayoutItemTypeEnumerator.swift",
        "Internal/PaginationHelpers.swift",
        "Internal/ScreenPixelAlignment.swift",
        "Internal/ScrollMetricsMutator.swift",
        "Internal/ScrollToItemContext.swift",
        "Internal/SubviewInsertionIndexTracker.swift",
        "Internal/UIView+NoAnimation.swift",
        "Internal/VisibleItem.swift",
        "Internal/VisibleItemsProvider.swift",
        "Public/AnyCalendarItemModel.swift",
        "Public/CalendarItemModel.swift",
        "Public/CalendarItemViewRepresentable.swift",
        "Public/CalendarView.swift",
        "Public/CalendarViewContent.swift",
        "Public/CalendarViewProxy.swift",
        "Public/CalendarViewRepresentable.swift",
        "Public/CalendarViewScrollPosition.swift",
        "Public/Day.swift",
        "Public/DayOfWeekPosition.swift",
        "Public/DayRange.swift",
        "Public/DayRangeLayoutContext.swift",
        "Public/DaysOfTheWeekRowSeparatorOptions.swift",
        "Public/ItemViews/DayOfWeekView.swift",
        "Public/ItemViews/DayView.swift",
        "Public/ItemViews/DrawingConfig.swift",
        "Public/ItemViews/MonthGridBackgroundView.swift",
        "Public/ItemViews/MonthHeaderView.swift",
        "Public/ItemViews/Shape.swift",
        "Public/ItemViews/SwiftUIWrapperView.swift",
        "Public/Month.swift",
        "Public/MonthLayoutContext.swift",
        "Public/MonthRange.swift",
        "Public/MonthsLayout.swift",
        "Public/OverlaidItemLocation.swift",
        "Public/OverlayLayoutContext.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.8.1"
}
Command line invocation:
    /Applications/Xcode-16.3.0.app/Contents/Developer/usr/bin/xcodebuild -IDEClonedSourcePackagesDirPathOverride=/Users/admin/builder/spi-builder-workspace/.dependencies -resolvePackageDependencies
resolved source packages:
{
  "dependencies" : [
    {
      "identity" : "swift",
      "requirement" : {
        "range" : [
          {
            "lower_bound" : "1.2.0",
            "upper_bound" : "2.0.0"
          }
        ]
      },
      "type" : "sourceControl",
      "url" : "https://github.com/airbnb/swift"
    }
  ],
  "manifest_display_name" : "HorizonCalendar",
  "name" : "HorizonCalendar",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
    {
      "name" : "ios",
      "version" : "12.0"
    }
  ],
  "products" : [
    {
      "name" : "HorizonCalendar",
      "targets" : [
        "HorizonCalendar"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "swift_languages_versions" : [
    "5"
  ],
  "targets" : [
    {
      "c99name" : "HorizonCalendarTests",
      "module_type" : "SwiftTarget",
      "name" : "HorizonCalendarTests",
      "path" : "Tests",
      "sources" : [
        "CalendarContentTests.swift",
        "DayHelperTests.swift",
        "DayOfWeekPositionTests.swift",
        "FrameProviderTests.swift",
        "HorizontalMonthsLayoutOptionsTests.swift",
        "ItemViewReuseManagerTests.swift",
        "LayoutItemTypeEnumeratorTests.swift",
        "MonthHelperTests.swift",
        "MonthRowTests.swift",
        "MonthTests.swift",
        "PaginationHelpersTests.swift",
        "ScreenPixelAlignmentTests.swift",
        "ScrollMetricsMutatorTests.swift",
        "SubviewsManagerTests.swift",
        "VisibleItemsProviderTests.swift"
      ],
      "target_dependencies" : [
        "HorizonCalendar"
      ],
      "type" : "test"
    },
    {
      "c99name" : "HorizonCalendar",
      "module_type" : "SwiftTarget",
      "name" : "HorizonCalendar",
      "path" : "Sources",
      "product_memberships" : [
        "HorizonCalendar"
      ],
      "sources" : [
        "Internal/CGFloat+MaxLayoutValue.swift",
        "Internal/Calendar+Helpers.swift",
        "Internal/CalendarScrollView.swift",
        "Internal/ColorViewRepresentable.swift",
        "Internal/Dictionary+MutatingValueForKey.swift",
        "Internal/DoubleLayoutPassHelpers.swift",
        "Internal/FrameProvider.swift",
        "Internal/Hasher+CGRect.swift",
        "Internal/ItemView.swift",
        "Internal/ItemViewReuseManager.swift",
        "Internal/LayoutItem.swift",
        "Internal/LayoutItemTypeEnumerator.swift",
        "Internal/PaginationHelpers.swift",
        "Internal/ScreenPixelAlignment.swift",
        "Internal/ScrollMetricsMutator.swift",
        "Internal/ScrollToItemContext.swift",
        "Internal/SubviewInsertionIndexTracker.swift",
        "Internal/UIView+NoAnimation.swift",
        "Internal/VisibleItem.swift",
        "Internal/VisibleItemsProvider.swift",
        "Public/AnyCalendarItemModel.swift",
        "Public/CalendarItemModel.swift",
        "Public/CalendarItemViewRepresentable.swift",
        "Public/CalendarView.swift",
        "Public/CalendarViewContent.swift",
        "Public/CalendarViewProxy.swift",
        "Public/CalendarViewRepresentable.swift",
        "Public/CalendarViewScrollPosition.swift",
        "Public/Day.swift",
        "Public/DayOfWeekPosition.swift",
        "Public/DayRange.swift",
        "Public/DayRangeLayoutContext.swift",
        "Public/DaysOfTheWeekRowSeparatorOptions.swift",
        "Public/ItemViews/DayOfWeekView.swift",
        "Public/ItemViews/DayView.swift",
        "Public/ItemViews/DrawingConfig.swift",
        "Public/ItemViews/MonthGridBackgroundView.swift",
        "Public/ItemViews/MonthHeaderView.swift",
        "Public/ItemViews/Shape.swift",
        "Public/ItemViews/SwiftUIWrapperView.swift",
        "Public/Month.swift",
        "Public/MonthLayoutContext.swift",
        "Public/MonthRange.swift",
        "Public/MonthsLayout.swift",
        "Public/OverlaidItemLocation.swift",
        "Public/OverlayLayoutContext.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.8.1"
}
{
  "project" : {
    "configurations" : [
      "Debug",
      "Release"
    ],
    "name" : "HorizonCalendar",
    "schemes" : [
      "HorizonCalendar"
    ],
    "targets" : [
      "HorizonCalendar",
      "HorizonCalendarTests"
    ]
  }
}
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-16.3.0.app xcrun xcodebuild -IDEClonedSourcePackagesDirPathOverride=$PWD/.dependencies -skipMacroValidation -skipPackagePluginValidation -derivedDataPath $PWD/.derivedData build -scheme HorizonCalendar -destination generic/platform=xrOS OTHER_SWIFT_FLAGS=-stats-output-dir .stats -strict-concurrency=complete -enable-upcoming-feature StrictConcurrency -enable-upcoming-feature DisableOutwardActorInference -enable-upcoming-feature GlobalActorIsolatedTypesUsability -enable-upcoming-feature InferSendableFromCaptures
Command line invocation:
    /Applications/Xcode-16.3.0.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 HorizonCalendar -destination generic/platform=xrOS "OTHER_SWIFT_FLAGS=-stats-output-dir .stats -strict-concurrency=complete -enable-upcoming-feature StrictConcurrency -enable-upcoming-feature DisableOutwardActorInference -enable-upcoming-feature GlobalActorIsolatedTypesUsability -enable-upcoming-feature InferSendableFromCaptures"
Build settings from command line:
    OTHER_SWIFT_FLAGS = -stats-output-dir .stats -strict-concurrency=complete -enable-upcoming-feature StrictConcurrency -enable-upcoming-feature DisableOutwardActorInference -enable-upcoming-feature GlobalActorIsolatedTypesUsability -enable-upcoming-feature InferSendableFromCaptures
2026-02-08 16:47:24.383 xcodebuild[611:3496] Writing error result bundle to /var/folders/5k/5yc19ymj0jqd5v0zvgfqz0xw0000gn/T/ResultBundle_2026-08-02_16-47-0024.xcresult
xcodebuild: error: Unable to find a destination matching the provided destination specifier:
		{ generic:1, platform:xrOS }
	Available destinations for the "HorizonCalendar" scheme:
		{ platform:macOS, arch:arm64, variant:Mac Catalyst, id:5f494c979650c7c5e998778fb916aa973c61cc41, name:My Mac }
		{ platform:macOS, arch:x86_64, variant:Mac Catalyst, id:5f494c979650c7c5e998778fb916aa973c61cc41, name:My Mac }
		{ platform:macOS, arch:arm64, variant:Designed for [iPad,iPhone], id:5f494c979650c7c5e998778fb916aa973c61cc41, 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, variant:Mac Catalyst, name:Any Mac }
INFRASTRUCTURE ERROR (status: destinationUnavailable