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Build Information

Failed to build HorizonCalendar, reference master (47e451), with Swift 6.3 for macOS (SPM) on 21 Apr 2026 14:00:20 UTC.

Build Command

env DEVELOPER_DIR=/Applications/Xcode-26.4.0.app xcrun swift build --arch arm64

Build Log

========================================
RunAll
========================================
Builder version: 4.70.0
Interrupt handler set up.
========================================
Checkout
========================================
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
Fetching https://github.com/airbnb/swift
Fetching https://github.com/apple/swift-argument-parser
[1/5064] Fetching swift
[305/22488] Fetching swift, swift-argument-parser
Fetched https://github.com/airbnb/swift from cache (3.11s)
Fetched https://github.com/apple/swift-argument-parser from cache (3.11s)
Computing version for https://github.com/airbnb/swift
Computed https://github.com/airbnb/swift at 1.2.0 (6.20s)
Computing version for https://github.com/apple/swift-argument-parser
Computed https://github.com/apple/swift-argument-parser at 1.2.3 (0.71s)
Creating working copy for https://github.com/airbnb/swift
Working copy of https://github.com/airbnb/swift resolved at 1.2.0
Creating working copy for https://github.com/apple/swift-argument-parser
Working copy of https://github.com/apple/swift-argument-parser resolved at 1.2.3
Downloading binary artifact https://github.com/calda/SwiftFormat-nightly/releases/download/2025-12-20/SwiftFormat.artifactbundle.zip
Downloading binary artifact https://github.com/realm/SwiftLint/releases/download/0.55.1/SwiftLintBinary-macos.artifactbundle.zip
[8259/11034045] Downloading https://github.com/realm/SwiftLint/releases/download/0.55.1/SwiftLintBinary-macos.artifactbundle.zip
[344188/57305396] Downloading https://github.com/realm/SwiftLint/releases/download/0.55.1/SwiftLintBinary-macos.artifactbundle.zip, https://github.com/calda/SwiftFormat-nightly/releases/download/2025-12-20/SwiftFormat.artifactbundle.zip
Downloaded https://github.com/realm/SwiftLint/releases/download/0.55.1/SwiftLintBinary-macos.artifactbundle.zip (1.49s)
Downloaded https://github.com/calda/SwiftFormat-nightly/releases/download/2025-12-20/SwiftFormat.artifactbundle.zip (3.27s)
========================================
ResolveProductDependencies
========================================
Resolving dependencies ...
{
  "identity": ".resolve-product-dependencies",
  "name": "resolve-dependencies",
  "url": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies",
  "version": "unspecified",
  "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies",
  "traits": [
    "default"
  ],
  "dependencies": [
    {
      "identity": "horizoncalendar",
      "name": "HorizonCalendar",
      "url": "https://github.com/airbnb/HorizonCalendar.git",
      "version": "unspecified",
      "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/HorizonCalendar",
      "traits": [
        "default"
      ],
      "dependencies": [
      ]
    }
  ]
}
Fetching https://github.com/airbnb/HorizonCalendar.git
[1/4347] Fetching horizoncalendar
Fetched https://github.com/airbnb/HorizonCalendar.git from cache (1.97s)
Creating working copy for https://github.com/airbnb/HorizonCalendar.git
Working copy of https://github.com/airbnb/HorizonCalendar.git resolved at master (47e451e)
warning: '.resolve-product-dependencies': dependency 'horizoncalendar' is not used by any target
Found 0 product dependencies
========================================
Build
========================================
Selected platform:         macosSpm
Swift version:             6.3
Building package at path:  $PWD
https://github.com/airbnb/HorizonCalendar.git
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-26.4.0.app xcrun swift build --arch arm64
[1/1] Compiling plugin FormatSwift
[2/2] Compiling plugin GenerateManual
Building for debugging...
[2/4] Write sources
[3/4] Write swift-version--6988338F2F200930.txt
[5/47] Compiling HorizonCalendar DayRange.swift
/Users/admin/builder/spi-builder-workspace/Sources/Internal/CalendarScrollView.swift:16:8: error: no such module 'UIKit'
14 | // limitations under the License.
15 |
16 | import UIKit
   |        `- error: no such module 'UIKit'
17 |
18 | /// A scroll view with altered behavior to better fit the needs of `CalendarView`.
[6/47] Compiling HorizonCalendar DayRangeLayoutContext.swift
/Users/admin/builder/spi-builder-workspace/Sources/Internal/CalendarScrollView.swift:16:8: error: no such module 'UIKit'
14 | // limitations under the License.
15 |
16 | import UIKit
   |        `- error: no such module 'UIKit'
17 |
18 | /// A scroll view with altered behavior to better fit the needs of `CalendarView`.
[7/47] Compiling HorizonCalendar DaysOfTheWeekRowSeparatorOptions.swift
/Users/admin/builder/spi-builder-workspace/Sources/Internal/CalendarScrollView.swift:16:8: error: no such module 'UIKit'
14 | // limitations under the License.
15 |
16 | import UIKit
   |        `- error: no such module 'UIKit'
17 |
18 | /// A scroll view with altered behavior to better fit the needs of `CalendarView`.
[8/47] Compiling HorizonCalendar DayOfWeekView.swift
/Users/admin/builder/spi-builder-workspace/Sources/Internal/CalendarScrollView.swift:16:8: error: no such module 'UIKit'
14 | // limitations under the License.
15 |
16 | import UIKit
   |        `- error: no such module 'UIKit'
17 |
18 | /// A scroll view with altered behavior to better fit the needs of `CalendarView`.
[9/47] Compiling HorizonCalendar CGFloat+MaxLayoutValue.swift
/Users/admin/builder/spi-builder-workspace/Sources/Internal/CalendarScrollView.swift:16:8: error: no such module 'UIKit'
14 | // limitations under the License.
15 |
16 | import UIKit
   |        `- error: no such module 'UIKit'
17 |
18 | /// A scroll view with altered behavior to better fit the needs of `CalendarView`.
[10/47] Compiling HorizonCalendar Calendar+Helpers.swift
/Users/admin/builder/spi-builder-workspace/Sources/Internal/CalendarScrollView.swift:16:8: error: no such module 'UIKit'
14 | // limitations under the License.
15 |
16 | import UIKit
   |        `- error: no such module 'UIKit'
17 |
18 | /// A scroll view with altered behavior to better fit the needs of `CalendarView`.
[11/47] Compiling HorizonCalendar CalendarScrollView.swift
/Users/admin/builder/spi-builder-workspace/Sources/Internal/CalendarScrollView.swift:16:8: error: no such module 'UIKit'
14 | // limitations under the License.
15 |
16 | import UIKit
   |        `- error: no such module 'UIKit'
17 |
18 | /// A scroll view with altered behavior to better fit the needs of `CalendarView`.
[12/47] Compiling HorizonCalendar ColorViewRepresentable.swift
/Users/admin/builder/spi-builder-workspace/Sources/Internal/CalendarScrollView.swift:16:8: error: no such module 'UIKit'
14 | // limitations under the License.
15 |
16 | import UIKit
   |        `- error: no such module 'UIKit'
17 |
18 | /// A scroll view with altered behavior to better fit the needs of `CalendarView`.
[13/47] Compiling HorizonCalendar Dictionary+MutatingValueForKey.swift
/Users/admin/builder/spi-builder-workspace/Sources/Internal/CalendarScrollView.swift:16:8: error: no such module 'UIKit'
14 | // limitations under the License.
15 |
16 | import UIKit
   |        `- error: no such module 'UIKit'
17 |
18 | /// A scroll view with altered behavior to better fit the needs of `CalendarView`.
[14/51] Compiling HorizonCalendar MonthRange.swift
/Users/admin/builder/spi-builder-workspace/Sources/Internal/CalendarScrollView.swift:16:8: error: no such module 'UIKit'
14 | // limitations under the License.
15 |
16 | import UIKit
   |        `- error: no such module 'UIKit'
17 |
18 | /// A scroll view with altered behavior to better fit the needs of `CalendarView`.
[15/51] Compiling HorizonCalendar MonthsLayout.swift
/Users/admin/builder/spi-builder-workspace/Sources/Internal/CalendarScrollView.swift:16:8: error: no such module 'UIKit'
14 | // limitations under the License.
15 |
16 | import UIKit
   |        `- error: no such module 'UIKit'
17 |
18 | /// A scroll view with altered behavior to better fit the needs of `CalendarView`.
[16/51] Compiling HorizonCalendar OverlaidItemLocation.swift
/Users/admin/builder/spi-builder-workspace/Sources/Internal/CalendarScrollView.swift:16:8: error: no such module 'UIKit'
14 | // limitations under the License.
15 |
16 | import UIKit
   |        `- error: no such module 'UIKit'
17 |
18 | /// A scroll view with altered behavior to better fit the needs of `CalendarView`.
[17/51] Compiling HorizonCalendar OverlayLayoutContext.swift
/Users/admin/builder/spi-builder-workspace/Sources/Internal/CalendarScrollView.swift:16:8: error: no such module 'UIKit'
14 | // limitations under the License.
15 |
16 | import UIKit
   |        `- error: no such module 'UIKit'
17 |
18 | /// A scroll view with altered behavior to better fit the needs of `CalendarView`.
[18/51] Compiling HorizonCalendar CalendarViewProxy.swift
/Users/admin/builder/spi-builder-workspace/Sources/Internal/CalendarScrollView.swift:16:8: error: no such module 'UIKit'
14 | // limitations under the License.
15 |
16 | import UIKit
   |        `- error: no such module 'UIKit'
17 |
18 | /// A scroll view with altered behavior to better fit the needs of `CalendarView`.
[19/51] Compiling HorizonCalendar CalendarViewRepresentable.swift
/Users/admin/builder/spi-builder-workspace/Sources/Internal/CalendarScrollView.swift:16:8: error: no such module 'UIKit'
14 | // limitations under the License.
15 |
16 | import UIKit
   |        `- error: no such module 'UIKit'
17 |
18 | /// A scroll view with altered behavior to better fit the needs of `CalendarView`.
[20/51] Compiling HorizonCalendar CalendarViewScrollPosition.swift
/Users/admin/builder/spi-builder-workspace/Sources/Internal/CalendarScrollView.swift:16:8: error: no such module 'UIKit'
14 | // limitations under the License.
15 |
16 | import UIKit
   |        `- error: no such module 'UIKit'
17 |
18 | /// A scroll view with altered behavior to better fit the needs of `CalendarView`.
[21/51] Compiling HorizonCalendar Day.swift
/Users/admin/builder/spi-builder-workspace/Sources/Internal/CalendarScrollView.swift:16:8: error: no such module 'UIKit'
14 | // limitations under the License.
15 |
16 | import UIKit
   |        `- error: no such module 'UIKit'
17 |
18 | /// A scroll view with altered behavior to better fit the needs of `CalendarView`.
[22/51] Compiling HorizonCalendar DayOfWeekPosition.swift
/Users/admin/builder/spi-builder-workspace/Sources/Internal/CalendarScrollView.swift:16:8: error: no such module 'UIKit'
14 | // limitations under the License.
15 |
16 | import UIKit
   |        `- error: no such module 'UIKit'
17 |
18 | /// A scroll view with altered behavior to better fit the needs of `CalendarView`.
error: emit-module command failed with exit code 1 (use -v to see invocation)
[23/51] Emitting module HorizonCalendar
/Users/admin/builder/spi-builder-workspace/Sources/Internal/CalendarScrollView.swift:16:8: error: no such module 'UIKit'
14 | // limitations under the License.
15 |
16 | import UIKit
   |        `- error: no such module 'UIKit'
17 |
18 | /// A scroll view with altered behavior to better fit the needs of `CalendarView`.
[24/51] Compiling HorizonCalendar AnyCalendarItemModel.swift
/Users/admin/builder/spi-builder-workspace/Sources/Internal/CalendarScrollView.swift:16:8: error: no such module 'UIKit'
14 | // limitations under the License.
15 |
16 | import UIKit
   |        `- error: no such module 'UIKit'
17 |
18 | /// A scroll view with altered behavior to better fit the needs of `CalendarView`.
[25/51] Compiling HorizonCalendar CalendarItemModel.swift
/Users/admin/builder/spi-builder-workspace/Sources/Internal/CalendarScrollView.swift:16:8: error: no such module 'UIKit'
14 | // limitations under the License.
15 |
16 | import UIKit
   |        `- error: no such module 'UIKit'
17 |
18 | /// A scroll view with altered behavior to better fit the needs of `CalendarView`.
[26/51] Compiling HorizonCalendar CalendarItemViewRepresentable.swift
/Users/admin/builder/spi-builder-workspace/Sources/Internal/CalendarScrollView.swift:16:8: error: no such module 'UIKit'
14 | // limitations under the License.
15 |
16 | import UIKit
   |        `- error: no such module 'UIKit'
17 |
18 | /// A scroll view with altered behavior to better fit the needs of `CalendarView`.
[27/51] Compiling HorizonCalendar CalendarView.swift
/Users/admin/builder/spi-builder-workspace/Sources/Internal/CalendarScrollView.swift:16:8: error: no such module 'UIKit'
14 | // limitations under the License.
15 |
16 | import UIKit
   |        `- error: no such module 'UIKit'
17 |
18 | /// A scroll view with altered behavior to better fit the needs of `CalendarView`.
[28/51] Compiling HorizonCalendar CalendarViewContent.swift
/Users/admin/builder/spi-builder-workspace/Sources/Internal/CalendarScrollView.swift:16:8: error: no such module 'UIKit'
14 | // limitations under the License.
15 |
16 | import UIKit
   |        `- error: no such module 'UIKit'
17 |
18 | /// A scroll view with altered behavior to better fit the needs of `CalendarView`.
[29/51] Compiling HorizonCalendar Shape.swift
/Users/admin/builder/spi-builder-workspace/Sources/Internal/CalendarScrollView.swift:16:8: error: no such module 'UIKit'
14 | // limitations under the License.
15 |
16 | import UIKit
   |        `- error: no such module 'UIKit'
17 |
18 | /// A scroll view with altered behavior to better fit the needs of `CalendarView`.
[30/51] Compiling HorizonCalendar SwiftUIWrapperView.swift
/Users/admin/builder/spi-builder-workspace/Sources/Internal/CalendarScrollView.swift:16:8: error: no such module 'UIKit'
14 | // limitations under the License.
15 |
16 | import UIKit
   |        `- error: no such module 'UIKit'
17 |
18 | /// A scroll view with altered behavior to better fit the needs of `CalendarView`.
[31/51] Compiling HorizonCalendar Month.swift
/Users/admin/builder/spi-builder-workspace/Sources/Internal/CalendarScrollView.swift:16:8: error: no such module 'UIKit'
14 | // limitations under the License.
15 |
16 | import UIKit
   |        `- error: no such module 'UIKit'
17 |
18 | /// A scroll view with altered behavior to better fit the needs of `CalendarView`.
[32/51] Compiling HorizonCalendar MonthLayoutContext.swift
/Users/admin/builder/spi-builder-workspace/Sources/Internal/CalendarScrollView.swift:16:8: error: no such module 'UIKit'
14 | // limitations under the License.
15 |
16 | import UIKit
   |        `- error: no such module 'UIKit'
17 |
18 | /// A scroll view with altered behavior to better fit the needs of `CalendarView`.
[33/51] Compiling HorizonCalendar DayView.swift
/Users/admin/builder/spi-builder-workspace/Sources/Internal/CalendarScrollView.swift:16:8: error: no such module 'UIKit'
14 | // limitations under the License.
15 |
16 | import UIKit
   |        `- error: no such module 'UIKit'
17 |
18 | /// A scroll view with altered behavior to better fit the needs of `CalendarView`.
[34/51] Compiling HorizonCalendar DrawingConfig.swift
/Users/admin/builder/spi-builder-workspace/Sources/Internal/CalendarScrollView.swift:16:8: error: no such module 'UIKit'
14 | // limitations under the License.
15 |
16 | import UIKit
   |        `- error: no such module 'UIKit'
17 |
18 | /// A scroll view with altered behavior to better fit the needs of `CalendarView`.
[35/51] Compiling HorizonCalendar MonthGridBackgroundView.swift
/Users/admin/builder/spi-builder-workspace/Sources/Internal/CalendarScrollView.swift:16:8: error: no such module 'UIKit'
14 | // limitations under the License.
15 |
16 | import UIKit
   |        `- error: no such module 'UIKit'
17 |
18 | /// A scroll view with altered behavior to better fit the needs of `CalendarView`.
[36/51] Compiling HorizonCalendar MonthHeaderView.swift
/Users/admin/builder/spi-builder-workspace/Sources/Internal/CalendarScrollView.swift:16:8: error: no such module 'UIKit'
14 | // limitations under the License.
15 |
16 | import UIKit
   |        `- error: no such module 'UIKit'
17 |
18 | /// A scroll view with altered behavior to better fit the needs of `CalendarView`.
[37/51] Compiling HorizonCalendar LayoutItem.swift
/Users/admin/builder/spi-builder-workspace/Sources/Internal/CalendarScrollView.swift:16:8: error: no such module 'UIKit'
14 | // limitations under the License.
15 |
16 | import UIKit
   |        `- error: no such module 'UIKit'
17 |
18 | /// A scroll view with altered behavior to better fit the needs of `CalendarView`.
[38/51] Compiling HorizonCalendar LayoutItemTypeEnumerator.swift
/Users/admin/builder/spi-builder-workspace/Sources/Internal/CalendarScrollView.swift:16:8: error: no such module 'UIKit'
14 | // limitations under the License.
15 |
16 | import UIKit
   |        `- error: no such module 'UIKit'
17 |
18 | /// A scroll view with altered behavior to better fit the needs of `CalendarView`.
[39/51] Compiling HorizonCalendar PaginationHelpers.swift
/Users/admin/builder/spi-builder-workspace/Sources/Internal/CalendarScrollView.swift:16:8: error: no such module 'UIKit'
14 | // limitations under the License.
15 |
16 | import UIKit
   |        `- error: no such module 'UIKit'
17 |
18 | /// A scroll view with altered behavior to better fit the needs of `CalendarView`.
[40/51] Compiling HorizonCalendar ScreenPixelAlignment.swift
/Users/admin/builder/spi-builder-workspace/Sources/Internal/CalendarScrollView.swift:16:8: error: no such module 'UIKit'
14 | // limitations under the License.
15 |
16 | import UIKit
   |        `- error: no such module 'UIKit'
17 |
18 | /// A scroll view with altered behavior to better fit the needs of `CalendarView`.
[41/51] Compiling HorizonCalendar ScrollMetricsMutator.swift
/Users/admin/builder/spi-builder-workspace/Sources/Internal/CalendarScrollView.swift:16:8: error: no such module 'UIKit'
14 | // limitations under the License.
15 |
16 | import UIKit
   |        `- error: no such module 'UIKit'
17 |
18 | /// A scroll view with altered behavior to better fit the needs of `CalendarView`.
[42/51] Compiling HorizonCalendar ScrollToItemContext.swift
/Users/admin/builder/spi-builder-workspace/Sources/Internal/CalendarScrollView.swift:16:8: error: no such module 'UIKit'
14 | // limitations under the License.
15 |
16 | import UIKit
   |        `- error: no such module 'UIKit'
17 |
18 | /// A scroll view with altered behavior to better fit the needs of `CalendarView`.
[43/51] Compiling HorizonCalendar SubviewInsertionIndexTracker.swift
/Users/admin/builder/spi-builder-workspace/Sources/Internal/CalendarScrollView.swift:16:8: error: no such module 'UIKit'
14 | // limitations under the License.
15 |
16 | import UIKit
   |        `- error: no such module 'UIKit'
17 |
18 | /// A scroll view with altered behavior to better fit the needs of `CalendarView`.
[44/51] Compiling HorizonCalendar UIView+NoAnimation.swift
/Users/admin/builder/spi-builder-workspace/Sources/Internal/CalendarScrollView.swift:16:8: error: no such module 'UIKit'
14 | // limitations under the License.
15 |
16 | import UIKit
   |        `- error: no such module 'UIKit'
17 |
18 | /// A scroll view with altered behavior to better fit the needs of `CalendarView`.
[45/51] Compiling HorizonCalendar VisibleItem.swift
/Users/admin/builder/spi-builder-workspace/Sources/Internal/CalendarScrollView.swift:16:8: error: no such module 'UIKit'
14 | // limitations under the License.
15 |
16 | import UIKit
   |        `- error: no such module 'UIKit'
17 |
18 | /// A scroll view with altered behavior to better fit the needs of `CalendarView`.
[46/51] Compiling HorizonCalendar VisibleItemsProvider.swift
/Users/admin/builder/spi-builder-workspace/Sources/Internal/CalendarScrollView.swift:16:8: error: no such module 'UIKit'
14 | // limitations under the License.
15 |
16 | import UIKit
   |        `- error: no such module 'UIKit'
17 |
18 | /// A scroll view with altered behavior to better fit the needs of `CalendarView`.
[47/51] Compiling HorizonCalendar DoubleLayoutPassHelpers.swift
/Users/admin/builder/spi-builder-workspace/Sources/Internal/CalendarScrollView.swift:16:8: error: no such module 'UIKit'
14 | // limitations under the License.
15 |
16 | import UIKit
   |        `- error: no such module 'UIKit'
17 |
18 | /// A scroll view with altered behavior to better fit the needs of `CalendarView`.
[48/51] Compiling HorizonCalendar FrameProvider.swift
/Users/admin/builder/spi-builder-workspace/Sources/Internal/CalendarScrollView.swift:16:8: error: no such module 'UIKit'
14 | // limitations under the License.
15 |
16 | import UIKit
   |        `- error: no such module 'UIKit'
17 |
18 | /// A scroll view with altered behavior to better fit the needs of `CalendarView`.
[49/51] Compiling HorizonCalendar Hasher+CGRect.swift
/Users/admin/builder/spi-builder-workspace/Sources/Internal/CalendarScrollView.swift:16:8: error: no such module 'UIKit'
14 | // limitations under the License.
15 |
16 | import UIKit
   |        `- error: no such module 'UIKit'
17 |
18 | /// A scroll view with altered behavior to better fit the needs of `CalendarView`.
[50/51] Compiling HorizonCalendar ItemView.swift
/Users/admin/builder/spi-builder-workspace/Sources/Internal/CalendarScrollView.swift:16:8: error: no such module 'UIKit'
14 | // limitations under the License.
15 |
16 | import UIKit
   |        `- error: no such module 'UIKit'
17 |
18 | /// A scroll view with altered behavior to better fit the needs of `CalendarView`.
[51/51] Compiling HorizonCalendar ItemViewReuseManager.swift
/Users/admin/builder/spi-builder-workspace/Sources/Internal/CalendarScrollView.swift:16:8: error: no such module 'UIKit'
14 | // limitations under the License.
15 |
16 | import UIKit
   |        `- error: no such module 'UIKit'
17 |
18 | /// A scroll view with altered behavior to better fit the needs of `CalendarView`.
BUILD FAILURE 6.3 macosSpm