Swift Package Index

Build Information

Failed to build Mobius, reference 0.7.0 (2ce2f0), with Swift 6.3 for macOS (SPM) on 16 Apr 2026 19:15:42 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/spotify/Mobius.swift.git
Reference: 0.7.0
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/spotify/Mobius.swift
 * tag               0.7.0      -> FETCH_HEAD
HEAD is now at 2ce2f06 Merge pull request #216 from spotify/tools-version
Cloned https://github.com/spotify/Mobius.swift.git
Revision (git rev-parse @):
2ce2f0641cb19194405d553ca8b54196f01d8969
SUCCESS checkout https://github.com/spotify/Mobius.swift.git at 0.7.0
Fetching https://github.com/apple/swift-algorithms.git
Fetching https://github.com/pointfreeco/swift-case-paths
Fetching https://github.com/Quick/Quick
Fetching https://github.com/apple/swift-argument-parser.git
Fetching https://github.com/apple/swift-numerics.git
Fetching https://github.com/mattgallagher/CwlCatchException.git
Fetching https://github.com/Quick/Nimble
[1/460] Fetching cwlcatchexception
[402/6518] Fetching cwlcatchexception, swift-algorithms
Fetched https://github.com/mattgallagher/CwlCatchException.git from cache (0.72s)
Fetching https://github.com/mattgallagher/CwlPreconditionTesting.git
[123/10674] Fetching swift-algorithms, swift-case-paths
[308/28197] Fetching swift-algorithms, swift-case-paths, swift-argument-parser
[309/34613] Fetching swift-algorithms, swift-case-paths, swift-argument-parser, swift-numerics
[2259/49515] Fetching swift-algorithms, swift-case-paths, swift-argument-parser, swift-numerics, quick
[23855/69338] Fetching swift-algorithms, swift-case-paths, swift-argument-parser, swift-numerics, quick, nimble
[49715/70595] Fetching swift-algorithms, swift-case-paths, swift-argument-parser, swift-numerics, quick, nimble, cwlpreconditiontesting
Fetched https://github.com/apple/swift-argument-parser.git from cache (1.56s)
Fetched https://github.com/apple/swift-numerics.git from cache (1.56s)
Fetched https://github.com/Quick/Quick from cache (1.56s)
[12325/31754] Fetching swift-algorithms, swift-case-paths, nimble, cwlpreconditiontesting
Fetched https://github.com/mattgallagher/CwlPreconditionTesting.git from cache (0.91s)
[12657/30497] Fetching swift-algorithms, swift-case-paths, nimble
Fetched https://github.com/Quick/Nimble from cache (2.22s)
Fetched https://github.com/pointfreeco/swift-case-paths from cache (2.22s)
Computing version for https://github.com/Quick/Quick
Fetched https://github.com/apple/swift-algorithms.git from cache (2.22s)
Computed https://github.com/Quick/Quick at 7.6.2 (2.87s)
Computing version for https://github.com/Quick/Nimble
Computed https://github.com/Quick/Nimble at 10.0.0 (0.72s)
Computing version for https://github.com/pointfreeco/swift-case-paths
Computed https://github.com/pointfreeco/swift-case-paths at 0.10.1 (0.74s)
Computing version for https://github.com/apple/swift-algorithms.git
Computed https://github.com/apple/swift-algorithms.git at 1.2.1 (0.83s)
Computing version for https://github.com/apple/swift-argument-parser.git
Computed https://github.com/apple/swift-argument-parser.git at 1.6.1 (0.82s)
Computing version for https://github.com/mattgallagher/CwlPreconditionTesting.git
Computed https://github.com/mattgallagher/CwlPreconditionTesting.git at 2.1.0 (0.96s)
Computing version for https://github.com/apple/swift-numerics.git
Computed https://github.com/apple/swift-numerics.git at 1.0.3 (0.85s)
Computing version for https://github.com/mattgallagher/CwlCatchException.git
Computed https://github.com/mattgallagher/CwlCatchException.git at 2.0.0 (0.73s)
Creating working copy for https://github.com/mattgallagher/CwlPreconditionTesting.git
Working copy of https://github.com/mattgallagher/CwlPreconditionTesting.git resolved at 2.1.0
Creating working copy for https://github.com/apple/swift-argument-parser.git
Working copy of https://github.com/apple/swift-argument-parser.git resolved at 1.6.1
Creating working copy for https://github.com/apple/swift-algorithms.git
Working copy of https://github.com/apple/swift-algorithms.git resolved at 1.2.1
Creating working copy for https://github.com/mattgallagher/CwlCatchException.git
Working copy of https://github.com/mattgallagher/CwlCatchException.git resolved at 2.0.0
Creating working copy for https://github.com/Quick/Quick
Working copy of https://github.com/Quick/Quick resolved at 7.6.2
Creating working copy for https://github.com/pointfreeco/swift-case-paths
Working copy of https://github.com/pointfreeco/swift-case-paths resolved at 0.10.1
Creating working copy for https://github.com/apple/swift-numerics.git
Working copy of https://github.com/apple/swift-numerics.git resolved at 1.0.3
Creating working copy for https://github.com/Quick/Nimble
Working copy of https://github.com/Quick/Nimble resolved at 10.0.0
========================================
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": "mobius.swift",
      "name": "Mobius",
      "url": "https://github.com/spotify/Mobius.swift.git",
      "version": "unspecified",
      "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/Mobius.swift",
      "traits": [
        "default"
      ],
      "dependencies": [
        {
          "identity": "swift-case-paths",
          "name": "swift-case-paths",
          "url": "https://github.com/pointfreeco/swift-case-paths",
          "version": "0.10.1",
          "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/swift-case-paths",
          "traits": [
            "default"
          ],
          "dependencies": [
          ]
        },
        {
          "identity": "nimble",
          "name": "Nimble",
          "url": "https://github.com/Quick/Nimble",
          "version": "10.0.0",
          "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/Nimble",
          "traits": [
            "default"
          ],
          "dependencies": [
            {
              "identity": "cwlpreconditiontesting",
              "name": "CwlPreconditionTesting",
              "url": "https://github.com/mattgallagher/CwlPreconditionTesting.git",
              "version": "2.2.2",
              "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/CwlPreconditionTesting",
              "traits": [
                "default"
              ],
              "dependencies": [
                {
                  "identity": "cwlcatchexception",
                  "name": "CwlCatchException",
                  "url": "https://github.com/mattgallagher/CwlCatchException.git",
                  "version": "2.2.1",
                  "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/CwlCatchException",
                  "traits": [
                    "default"
                  ],
                  "dependencies": [
                  ]
                }
              ]
            }
          ]
        }
      ]
    }
  ]
}
Fetching https://github.com/spotify/Mobius.swift.git
[1/5204] Fetching mobius.swift
Fetched https://github.com/spotify/Mobius.swift.git from cache (1.05s)
Fetching https://github.com/pointfreeco/swift-case-paths from cache
Fetching https://github.com/Quick/Nimble from cache
Fetched https://github.com/Quick/Nimble from cache (0.66s)
Fetched https://github.com/pointfreeco/swift-case-paths from cache (0.66s)
Computing version for https://github.com/Quick/Nimble
Computed https://github.com/Quick/Nimble at 10.0.0 (0.73s)
Fetching https://github.com/mattgallagher/CwlPreconditionTesting.git from cache
Fetched https://github.com/mattgallagher/CwlPreconditionTesting.git from cache (0.42s)
Computing version for https://github.com/pointfreeco/swift-case-paths
Computed https://github.com/pointfreeco/swift-case-paths at 0.10.1 (0.53s)
Computing version for https://github.com/mattgallagher/CwlPreconditionTesting.git
Computed https://github.com/mattgallagher/CwlPreconditionTesting.git at 2.2.2 (0.70s)
Fetching https://github.com/mattgallagher/CwlCatchException.git from cache
Fetched https://github.com/mattgallagher/CwlCatchException.git from cache (0.44s)
Computing version for https://github.com/mattgallagher/CwlCatchException.git
Computed https://github.com/mattgallagher/CwlCatchException.git at 2.2.1 (1.14s)
Creating working copy for https://github.com/mattgallagher/CwlCatchException.git
Working copy of https://github.com/mattgallagher/CwlCatchException.git resolved at 2.2.1
Creating working copy for https://github.com/Quick/Nimble
Working copy of https://github.com/Quick/Nimble resolved at 10.0.0
Creating working copy for https://github.com/spotify/Mobius.swift.git
Working copy of https://github.com/spotify/Mobius.swift.git resolved at 0.7.0 (2ce2f06)
Creating working copy for https://github.com/mattgallagher/CwlPreconditionTesting.git
Working copy of https://github.com/mattgallagher/CwlPreconditionTesting.git resolved at 2.2.2
Creating working copy for https://github.com/pointfreeco/swift-case-paths
Working copy of https://github.com/pointfreeco/swift-case-paths resolved at 0.10.1
warning: '.resolve-product-dependencies': dependency 'mobius.swift' is not used by any target
Found 2 product dependencies
  - swift-case-paths
  - Nimble
========================================
Build
========================================
Selected platform:         macosSpm
Swift version:             6.3
Building package at path:  $PWD
https://github.com/spotify/Mobius.swift.git
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-26.4.0.app xcrun swift build --arch arm64
[1/1] Compiling plugin LintCommandPlugin
[2/2] Compiling plugin LintWarning
[3/3] Compiling plugin LintError
[4/4] Compiling plugin DefocusCommandPlugin
[5/5] Compiling plugin GenerateManual
[6/6] Compiling plugin GenerateDoccReference
Building for debugging...
[6/19] Write sources
[14/19] Write swift-version--6988338F2F200930.txt
[15/24] Compiling CwlMachBadInstructionHandler mach_excServer.c
[16/24] Compiling CwlCatchExceptionSupport CwlCatchException.m
[17/24] Compiling MobiusThrowableAssertion MobiusThrowableAssertion.m
[18/24] Compiling CwlMachBadInstructionHandler CwlMachBadInstructionHandler.m
[20/26] Compiling CwlCatchException CwlCatchException.swift
[21/26] Emitting module CwlCatchException
[22/26] Compiling CasePaths CasePath.swift
[23/26] Compiling CasePaths EnumReflection.swift
[24/26] Compiling CasePaths CasePaths.swift
[25/26] Emitting module CasePaths
[26/26] Compiling CasePaths Operators.swift
[27/59] Compiling MobiusCore CompositeEventSourceBuilder.swift
[28/59] Compiling MobiusCore EventSource.swift
[29/59] Compiling MobiusCore First.swift
[30/59] Emitting module MobiusCore
[31/62] Compiling MobiusCore ConnectablePublisher.swift
[32/62] Compiling MobiusCore Connection.swift
[33/62] Compiling MobiusCore Consumer.swift
[34/62] Compiling MobiusCore Task+Disposable.swift
[35/62] Compiling MobiusCore EffectCallback.swift
[36/62] Compiling MobiusCore EffectExecutor.swift
[37/62] Compiling MobiusCore Lock.swift
[38/62] Compiling MobiusCore LoggingAdaptors.swift
[39/62] Compiling MobiusCore Mobius.swift
[40/62] Compiling MobiusCore EnumRoute.swift
/Users/admin/builder/spi-builder-workspace/MobiusCore/Source/EffectHandlers/EnumRoute.swift:11:54: error: cannot convert value of type '(@escaping (EffectParameters) -> Effect) -> Void?' to expected argument type '(Effect) -> EffectParameters?'
 9 |     ) -> _PartialEffectRouter<Effect, EffectParameters, Event> {
10 |         let casePath = /enumCase
11 |         return routeEffects(withParameters: casePath.extract)
   |                                                      `- error: cannot convert value of type '(@escaping (EffectParameters) -> Effect) -> Void?' to expected argument type '(Effect) -> EffectParameters?'
12 |     }
13 |
/Users/admin/builder/spi-builder-workspace/MobiusCore/Source/EffectHandlers/EnumRoute.swift:11:54: error: cannot convert value of type '(@escaping (EffectParameters) -> Effect) -> Void?' to expected argument type '(Effect) -> EffectParameters?'
 9 |     ) -> _PartialEffectRouter<Effect, EffectParameters, Event> {
10 |         let casePath = /enumCase
11 |         return routeEffects(withParameters: casePath.extract)
   |                                                      |- error: cannot convert value of type '(@escaping (EffectParameters) -> Effect) -> Void?' to expected argument type '(Effect) -> EffectParameters?'
   |                                                      `- note: arguments to generic parameter 'Wrapped' ('Void' and 'EffectParameters') are expected to be equal
12 |     }
13 |
[41/62] Compiling MobiusCore ThreadSafeConnectable.swift
/Users/admin/builder/spi-builder-workspace/MobiusCore/Source/EffectHandlers/EnumRoute.swift:11:54: error: cannot convert value of type '(@escaping (EffectParameters) -> Effect) -> Void?' to expected argument type '(Effect) -> EffectParameters?'
 9 |     ) -> _PartialEffectRouter<Effect, EffectParameters, Event> {
10 |         let casePath = /enumCase
11 |         return routeEffects(withParameters: casePath.extract)
   |                                                      `- error: cannot convert value of type '(@escaping (EffectParameters) -> Effect) -> Void?' to expected argument type '(Effect) -> EffectParameters?'
12 |     }
13 |
/Users/admin/builder/spi-builder-workspace/MobiusCore/Source/EffectHandlers/EnumRoute.swift:11:54: error: cannot convert value of type '(@escaping (EffectParameters) -> Effect) -> Void?' to expected argument type '(Effect) -> EffectParameters?'
 9 |     ) -> _PartialEffectRouter<Effect, EffectParameters, Event> {
10 |         let casePath = /enumCase
11 |         return routeEffects(withParameters: casePath.extract)
   |                                                      |- error: cannot convert value of type '(@escaping (EffectParameters) -> Effect) -> Void?' to expected argument type '(Effect) -> EffectParameters?'
   |                                                      `- note: arguments to generic parameter 'Wrapped' ('Void' and 'EffectParameters') are expected to be equal
12 |     }
13 |
[42/62] Compiling MobiusCore AnyEventSource.swift
/Users/admin/builder/spi-builder-workspace/MobiusCore/Source/EffectHandlers/EnumRoute.swift:11:54: error: cannot convert value of type '(@escaping (EffectParameters) -> Effect) -> Void?' to expected argument type '(Effect) -> EffectParameters?'
 9 |     ) -> _PartialEffectRouter<Effect, EffectParameters, Event> {
10 |         let casePath = /enumCase
11 |         return routeEffects(withParameters: casePath.extract)
   |                                                      `- error: cannot convert value of type '(@escaping (EffectParameters) -> Effect) -> Void?' to expected argument type '(Effect) -> EffectParameters?'
12 |     }
13 |
/Users/admin/builder/spi-builder-workspace/MobiusCore/Source/EffectHandlers/EnumRoute.swift:11:54: error: cannot convert value of type '(@escaping (EffectParameters) -> Effect) -> Void?' to expected argument type '(Effect) -> EffectParameters?'
 9 |     ) -> _PartialEffectRouter<Effect, EffectParameters, Event> {
10 |         let casePath = /enumCase
11 |         return routeEffects(withParameters: casePath.extract)
   |                                                      |- error: cannot convert value of type '(@escaping (EffectParameters) -> Effect) -> Void?' to expected argument type '(Effect) -> EffectParameters?'
   |                                                      `- note: arguments to generic parameter 'Wrapped' ('Void' and 'EffectParameters') are expected to be equal
12 |     }
13 |
[43/62] Compiling MobiusCore EffectHandler.swift
[44/62] Compiling MobiusCore EffectRouter.swift
[45/62] Compiling MobiusCore EffectRouterDSL.swift
[46/62] Compiling MobiusCore AnonymousDisposable.swift
[47/62] Compiling MobiusCore CompositeDisposable.swift
[48/62] Compiling MobiusCore Disposable.swift
[49/62] Compiling MobiusCore MobiusController.swift
[50/62] Compiling MobiusCore MobiusHooks.swift
[51/62] Compiling MobiusCore MobiusLogger.swift
[52/62] Compiling MobiusCore AsyncDispatchQueueConnectable.swift
[53/62] Compiling MobiusCore AsyncStartStopStateMachine.swift
[54/62] Compiling MobiusCore ConcurrentAccessDetector.swift
[55/62] Compiling MobiusCore Connectable.swift
[56/62] Emitting module CwlPreconditionTesting
[57/62] Compiling CwlPreconditionTesting CwlBadInstructionException.swift
[58/62] Compiling CwlPreconditionTesting CwlCatchBadInstruction.swift
[59/62] Compiling CwlPreconditionTesting CwlDarwinDefinitions.swift
[60/62] Compiling MobiusCore MobiusLoop.swift
[61/62] Compiling MobiusCore Next.swift
[62/62] Compiling MobiusCore WorkBag.swift
error: cancelled
error: cancelled
error: cancelled
error: cancelled
error: cancelled
error: cancelled
error: cancelled
error: cancelled
error: cancelled
error: cancelled
error: cancelled
warning: 'quick': found 1 file(s) which are unhandled; explicitly declare them as resources or exclude from the target
    /Users/admin/builder/spi-builder-workspace/.build/checkouts/Quick/Sources/Quick/PrivacyInfo.xcprivacy
BUILD FAILURE 6.3 macosSpm