[KSP] Shaded XProcessing does not fully expand transitive type aliases

[TWiStErRob]

Dagger's KSP processor handles a direct Kotlin type alias, but fails when the same type is reached through two transitive aliases.

Versions

• Gradle 9.6.1
• Kotlin 2.4.10
• KSP 2.3.11
• Dagger 2.60.1
• No explicit Java toolchain; reproduced while Gradle was running on JDK 21

The same failure also occurs with a Java 25 toolchain and JVM target 25, so the toolchain is not relevant.

Reproduction

View the reproduction on GitHub.

Clone the reproduction and run the Gradle wrapper:

git clone https://github.com/TWiStErRob/repros.git
cd repros/dagger/typealias-of-typealias
./gradlew :kspKotlin

Expected result

The build succeeds. MyInterface, TypeAlias, and AnotherTypeAlias denote the same declared interface type.

Actual result

:kspKotlin fails:

@Provides methods must return a primitive, an array, a type variable, or a declared type
java.lang.AssertionError: [typealias TypeAlias] should not be checked for accessibility

Full stack trace

org.gradle.api.tasks.TaskExecutionException: Execution failed for task ':kspKotlin' (registered by plugin 'org.jetbrains.kotlin.jvm').
	at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.lambda$executeIfValid$1(ExecuteActionsTaskExecuter.java:135)
	at org.gradle.internal.Try$Failure.ifSuccessfulOrElse(Try.java:288)
	at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeIfValid(ExecuteActionsTaskExecuter.java:133)
	at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java:121)
	at org.gradle.api.internal.tasks.execution.ProblemsTaskPathTrackingTaskExecuter.execute(ProblemsTaskPathTrackingTaskExecuter.java:41)
	at org.gradle.api.internal.tasks.execution.ResolveTaskExecutionModeExecuter.execute(ResolveTaskExecutionModeExecuter.java:51)
	at org.gradle.api.internal.tasks.execution.FinalizePropertiesTaskExecuter.execute(FinalizePropertiesTaskExecuter.java:46)
	at org.gradle.api.internal.tasks.execution.SkipTaskWithNoActionsExecuter.execute(SkipTaskWithNoActionsExecuter.java:57)
	at org.gradle.api.internal.tasks.execution.SkipOnlyIfTaskExecuter.execute(SkipOnlyIfTaskExecuter.java:74)
	at org.gradle.api.internal.tasks.execution.CatchExceptionTaskExecuter.execute(CatchExceptionTaskExecuter.java:36)
	at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.executeTask(EventFiringTaskExecuter.java:77)
	at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.call(EventFiringTaskExecuter.java:55)
	at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.call(EventFiringTaskExecuter.java:52)
	at org.gradle.internal.operations.DefaultBuildOperationRunner$CallableBuildOperationWorker.execute(DefaultBuildOperationRunner.java:210)
	at org.gradle.internal.operations.DefaultBuildOperationRunner$CallableBuildOperationWorker.execute(DefaultBuildOperationRunner.java:205)
	at org.gradle.internal.operations.DefaultBuildOperationRunner$2.execute(DefaultBuildOperationRunner.java:67)
	at org.gradle.internal.operations.DefaultBuildOperationRunner$2.execute(DefaultBuildOperationRunner.java:60)
	at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:167)
	at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:60)
	at org.gradle.internal.operations.DefaultBuildOperationRunner.call(DefaultBuildOperationRunner.java:54)
	at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter.execute(EventFiringTaskExecuter.java:52)
	at org.gradle.execution.plan.DefaultNodeExecutor.executeLocalTaskNode(DefaultNodeExecutor.java:55)
	at org.gradle.execution.plan.DefaultNodeExecutor.execute(DefaultNodeExecutor.java:34)
	at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$InvokeNodeExecutorsAction.execute(DefaultTaskExecutionGraph.java:355)
	at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$InvokeNodeExecutorsAction.execute(DefaultTaskExecutionGraph.java:343)
	at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$BuildOperationAwareExecutionAction.lambda$execute$0(DefaultTaskExecutionGraph.java:339)
	at org.gradle.internal.operations.CurrentBuildOperationRef.with(CurrentBuildOperationRef.java:84)
	at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$BuildOperationAwareExecutionAction.execute(DefaultTaskExecutionGraph.java:339)
	at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$BuildOperationAwareExecutionAction.execute(DefaultTaskExecutionGraph.java:328)
	at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.execute(DefaultPlanExecutor.java:459)
	at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.run(DefaultPlanExecutor.java:376)
	at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:64)
	at org.gradle.internal.concurrent.AbstractManagedExecutor$1.run(AbstractManagedExecutor.java:47)
Caused by: org.gradle.workers.internal.DefaultWorkerExecutor$WorkExecutionException: A failure occurred while executing com.google.devtools.ksp.gradle.KspAAWorkerAction
	at org.gradle.workers.internal.DefaultWorkerExecutor$WorkItemExecution.waitForCompletion(DefaultWorkerExecutor.java:278)
	at org.gradle.internal.work.DefaultAsyncWorkTracker.lambda$waitForItemsAndGatherFailures$2(DefaultAsyncWorkTracker.java:132)
	at org.gradle.internal.Factories$1.create(Factories.java:30)
	at org.gradle.internal.work.DefaultWorkerLeaseService.lambda$withoutLocksBlocking$3(DefaultWorkerLeaseService.java:410)
	at org.gradle.internal.work.ResourceLockStatistics$1.measure(ResourceLockStatistics.java:43)
	at org.gradle.internal.work.DefaultWorkerLeaseService.withoutLocksBlocking(DefaultWorkerLeaseService.java:405)
	at org.gradle.internal.work.DefaultWorkerLeaseService.blocking(DefaultWorkerLeaseService.java:255)
	at org.gradle.internal.work.DefaultWorkerLeaseService.blocking(DefaultWorkerLeaseService.java:237)
	at org.gradle.internal.work.DefaultAsyncWorkTracker.lambda$waitForItemsAndGatherFailures$3(DefaultAsyncWorkTracker.java:128)
	at org.gradle.internal.Factories$1.create(Factories.java:30)
	at org.gradle.internal.resources.AbstractResourceLockRegistry.whileDisallowingLockChanges(AbstractResourceLockRegistry.java:50)
	at org.gradle.internal.work.DefaultWorkerLeaseService.whileDisallowingProjectLockChanges(DefaultWorkerLeaseService.java:260)
	at org.gradle.internal.work.DefaultAsyncWorkTracker.waitForItemsAndGatherFailures(DefaultAsyncWorkTracker.java:127)
	at org.gradle.internal.work.DefaultAsyncWorkTracker.waitForItemsAndGatherFailures(DefaultAsyncWorkTracker.java:93)
	at org.gradle.internal.work.DefaultAsyncWorkTracker.waitForAll(DefaultAsyncWorkTracker.java:79)
	at org.gradle.internal.work.DefaultAsyncWorkTracker.waitForCompletion(DefaultAsyncWorkTracker.java:67)
	at org.gradle.api.internal.tasks.execution.TaskExecution$3.run(TaskExecution.java:267)
	at org.gradle.internal.operations.DefaultBuildOperationRunner$1.execute(DefaultBuildOperationRunner.java:30)
	at org.gradle.internal.operations.DefaultBuildOperationRunner$1.execute(DefaultBuildOperationRunner.java:27)
	at org.gradle.internal.operations.DefaultBuildOperationRunner$2.execute(DefaultBuildOperationRunner.java:67)
	at org.gradle.internal.operations.DefaultBuildOperationRunner$2.execute(DefaultBuildOperationRunner.java:60)
	at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:167)
	at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:60)
	at org.gradle.internal.operations.DefaultBuildOperationRunner.run(DefaultBuildOperationRunner.java:48)
	at org.gradle.api.internal.tasks.execution.TaskExecution.executeAction(TaskExecution.java:244)
	at org.gradle.api.internal.tasks.execution.TaskExecution.executeActions(TaskExecution.java:227)
	at org.gradle.api.internal.tasks.execution.TaskExecution.executeWithPreviousOutputFiles(TaskExecution.java:210)
	at org.gradle.api.internal.tasks.execution.TaskExecution.execute(TaskExecution.java:176)
	at org.gradle.internal.execution.steps.ExecuteStep.executeInternal(ExecuteStep.java:167)
	at org.gradle.internal.execution.steps.ExecuteStep.access$000(ExecuteStep.java:47)
	at org.gradle.internal.execution.steps.ExecuteStep$1.call(ExecuteStep.java:137)
	at org.gradle.internal.execution.steps.ExecuteStep$1.call(ExecuteStep.java:134)
	at org.gradle.internal.operations.DefaultBuildOperationRunner$CallableBuildOperationWorker.execute(DefaultBuildOperationRunner.java:210)
	at org.gradle.internal.operations.DefaultBuildOperationRunner$CallableBuildOperationWorker.execute(DefaultBuildOperationRunner.java:205)
	at org.gradle.internal.operations.DefaultBuildOperationRunner$2.execute(DefaultBuildOperationRunner.java:67)
	at org.gradle.internal.operations.DefaultBuildOperationRunner$2.execute(DefaultBuildOperationRunner.java:60)
	at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:167)
	at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:60)
	at org.gradle.internal.operations.DefaultBuildOperationRunner.call(DefaultBuildOperationRunner.java:54)
	at org.gradle.internal.execution.steps.ExecuteStep.execute(ExecuteStep.java:134)
	at org.gradle.internal.execution.steps.ExecuteStep$Mutable.execute(ExecuteStep.java:80)
	at org.gradle.internal.execution.steps.CancelExecutionStep.execute(CancelExecutionStep.java:42)
	at org.gradle.internal.execution.steps.TimeoutStep.executeWithoutTimeout(TimeoutStep.java:75)
	at org.gradle.internal.execution.steps.TimeoutStep.execute(TimeoutStep.java:55)
	at org.gradle.internal.execution.steps.PreCreateOutputParentsStep.execute(PreCreateOutputParentsStep.java:51)
	at org.gradle.internal.execution.steps.PreCreateOutputParentsStep.execute(PreCreateOutputParentsStep.java:29)
	at org.gradle.internal.execution.steps.RemovePreviousOutputsStep.executeMutable(RemovePreviousOutputsStep.java:67)
	at org.gradle.internal.execution.steps.RemovePreviousOutputsStep.executeMutable(RemovePreviousOutputsStep.java:39)
	at org.gradle.internal.execution.steps.MutableStep.execute(MutableStep.java:26)
	at org.gradle.internal.execution.steps.BroadcastChangingOutputsStep.execute(BroadcastChangingOutputsStep.java:42)
	at org.gradle.internal.execution.steps.BroadcastChangingOutputsStep.execute(BroadcastChangingOutputsStep.java:24)
	at org.gradle.internal.execution.steps.CaptureOutputsAfterExecutionStep.execute(CaptureOutputsAfterExecutionStep.java:69)
	at org.gradle.internal.execution.steps.CaptureOutputsAfterExecutionStep.execute(CaptureOutputsAfterExecutionStep.java:46)
	at org.gradle.internal.execution.steps.ResolveInputChangesStep.executeMutable(ResolveInputChangesStep.java:39)
	at org.gradle.internal.execution.steps.ResolveInputChangesStep.executeMutable(ResolveInputChangesStep.java:28)
	at org.gradle.internal.execution.steps.MutableStep.execute(MutableStep.java:26)
	at org.gradle.internal.execution.steps.BuildCacheStep.executeWithoutCache(BuildCacheStep.java:189)
	at org.gradle.internal.execution.steps.BuildCacheStep.lambda$execute$1(BuildCacheStep.java:76)
	at org.gradle.internal.Either$Right.fold(Either.java:176)
	at org.gradle.internal.execution.caching.CachingState.fold(CachingState.java:62)
	at org.gradle.internal.execution.steps.BuildCacheStep.execute(BuildCacheStep.java:74)
	at org.gradle.internal.execution.steps.BuildCacheStep.execute(BuildCacheStep.java:49)
	at org.gradle.internal.execution.steps.StoreExecutionStateStep.executeMutable(StoreExecutionStateStep.java:46)
	at org.gradle.internal.execution.steps.StoreExecutionStateStep.executeMutable(StoreExecutionStateStep.java:35)
	at org.gradle.internal.execution.steps.MutableStep.execute(MutableStep.java:26)
	at org.gradle.internal.execution.steps.SkipUpToDateStep.executeBecause(SkipUpToDateStep.java:75)
	at org.gradle.internal.execution.steps.SkipUpToDateStep.lambda$execute$2(SkipUpToDateStep.java:53)
	at org.gradle.internal.execution.steps.SkipUpToDateStep.execute(SkipUpToDateStep.java:53)
	at org.gradle.internal.execution.steps.SkipUpToDateStep.execute(SkipUpToDateStep.java:35)
	at org.gradle.internal.execution.steps.legacy.MarkSnapshottingInputsFinishedStep.execute(MarkSnapshottingInputsFinishedStep.java:37)
	at org.gradle.internal.execution.steps.legacy.MarkSnapshottingInputsFinishedStep.execute(MarkSnapshottingInputsFinishedStep.java:27)
	at org.gradle.internal.execution.steps.ResolveMutableCachingStateStep.executeDelegate(ResolveMutableCachingStateStep.java:70)
	at org.gradle.internal.execution.steps.ResolveMutableCachingStateStep.executeDelegate(ResolveMutableCachingStateStep.java:32)
	at org.gradle.internal.execution.steps.AbstractResolveCachingStateStep.execute(AbstractResolveCachingStateStep.java:69)
	at org.gradle.internal.execution.steps.AbstractResolveCachingStateStep.execute(AbstractResolveCachingStateStep.java:37)
	at org.gradle.internal.execution.steps.ResolveChangesStep.executeMutable(ResolveChangesStep.java:63)
	at org.gradle.internal.execution.steps.ResolveChangesStep.executeMutable(ResolveChangesStep.java:34)
	at org.gradle.internal.execution.steps.MutableStep.execute(MutableStep.java:26)
	at org.gradle.internal.execution.steps.ValidateStep$Mutable.executeDelegate(ValidateStep.java:79)
	at org.gradle.internal.execution.steps.ValidateStep$Mutable.executeDelegate(ValidateStep.java:65)
	at org.gradle.internal.execution.steps.ValidateStep.execute(ValidateStep.java:105)
	at org.gradle.internal.execution.steps.ValidateStep$Mutable.execute(ValidateStep.java:65)
	at org.gradle.internal.execution.steps.CaptureMutableStateBeforeExecutionStep.executeMutable(CaptureMutableStateBeforeExecutionStep.java:86)
	at org.gradle.internal.execution.steps.CaptureMutableStateBeforeExecutionStep.execute(CaptureMutableStateBeforeExecutionStep.java:65)
	at org.gradle.internal.execution.steps.CaptureMutableStateBeforeExecutionStep.execute(CaptureMutableStateBeforeExecutionStep.java:45)
	at org.gradle.internal.execution.steps.SkipEmptyMutableWorkStep.executeWithNonEmptySources(SkipEmptyMutableWorkStep.java:210)
	at org.gradle.internal.execution.steps.SkipEmptyMutableWorkStep.executeMutable(SkipEmptyMutableWorkStep.java:90)
	at org.gradle.internal.execution.steps.SkipEmptyMutableWorkStep.executeMutable(SkipEmptyMutableWorkStep.java:53)
	at org.gradle.internal.execution.steps.MutableStep.execute(MutableStep.java:26)
	at org.gradle.internal.execution.steps.legacy.MarkSnapshottingInputsStartedStep.execute(MarkSnapshottingInputsStartedStep.java:38)
	at org.gradle.internal.execution.steps.LoadPreviousExecutionStateStep.executeMutable(LoadPreviousExecutionStateStep.java:36)
	at org.gradle.internal.execution.steps.LoadPreviousExecutionStateStep.executeMutable(LoadPreviousExecutionStateStep.java:23)
	at org.gradle.internal.execution.steps.MutableStep.execute(MutableStep.java:26)
	at org.gradle.internal.execution.steps.HandleStaleOutputsStep.executeMutable(HandleStaleOutputsStep.java:77)
	at org.gradle.internal.execution.steps.HandleStaleOutputsStep.executeMutable(HandleStaleOutputsStep.java:43)
	at org.gradle.internal.execution.steps.MutableStep.execute(MutableStep.java:26)
	at org.gradle.internal.execution.steps.AssignMutableWorkspaceStep.lambda$executeMutable$0(AssignMutableWorkspaceStep.java:34)
	at org.gradle.api.internal.tasks.execution.TaskExecution$4.withWorkspace(TaskExecution.java:305)
	at org.gradle.internal.execution.steps.AssignMutableWorkspaceStep.executeMutable(AssignMutableWorkspaceStep.java:30)
	at org.gradle.internal.execution.steps.AssignMutableWorkspaceStep.executeMutable(AssignMutableWorkspaceStep.java:21)
	at org.gradle.internal.execution.steps.MutableStep.execute(MutableStep.java:26)
	at org.gradle.internal.execution.steps.ChoosePipelineStep.execute(ChoosePipelineStep.java:40)
	at org.gradle.internal.execution.steps.ChoosePipelineStep.execute(ChoosePipelineStep.java:23)
	at org.gradle.internal.execution.steps.ExecuteWorkBuildOperationFiringStep.lambda$execute$2(ExecuteWorkBuildOperationFiringStep.java:67)
	at org.gradle.internal.execution.steps.ExecuteWorkBuildOperationFiringStep.execute(ExecuteWorkBuildOperationFiringStep.java:67)
	at org.gradle.internal.execution.steps.ExecuteWorkBuildOperationFiringStep.execute(ExecuteWorkBuildOperationFiringStep.java:39)
	at org.gradle.internal.execution.steps.IdentityCacheStep.execute(IdentityCacheStep.java:46)
	at org.gradle.internal.execution.steps.IdentityCacheStep.execute(IdentityCacheStep.java:34)
	at org.gradle.internal.execution.steps.IdentifyStep.execute(IdentifyStep.java:56)
	at org.gradle.internal.execution.steps.IdentifyStep.execute(IdentifyStep.java:38)
	at org.gradle.internal.execution.impl.DefaultExecutionEngine$1.execute(DefaultExecutionEngine.java:68)
	at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeIfValid(ExecuteActionsTaskExecuter.java:132)
	... 30 more
Caused by: java.lang.AssertionError: [typealias TypeAlias] should not be checked for accessibility
	at dagger.internal.codegen.xprocessing.Accessibility.isTypeAccessibleFrom(Accessibility.java:117)
	at dagger.internal.codegen.xprocessing.Accessibility.isTypeAccessibleFrom(Accessibility.java:92)
	at dagger.internal.codegen.binding.SourceFiles.lambda$generateBindingFieldsForDependencies$0(SourceFiles.java:96)
	at com.google.common.collect.Maps.toMap(Maps.java:1279)
	at com.google.common.collect.Maps.toMap(Maps.java:1257)
	at dagger.internal.codegen.binding.SourceFiles.generateBindingFieldsForDependencies(SourceFiles.java:87)
	at dagger.internal.codegen.writing.MembersInjectorGenerator.frameworkFields(MembersInjectorGenerator.java:369)
	at dagger.internal.codegen.writing.MembersInjectorGenerator.topLevelTypes(MembersInjectorGenerator.java:127)
	at dagger.internal.codegen.writing.MembersInjectorGenerator.topLevelTypes(MembersInjectorGenerator.java:95)
	at dagger.internal.codegen.base.SourceFileGenerator.generate(SourceFileGenerator.java:75)
	at dagger.internal.codegen.validation.InjectBindingRegistryImpl$BindingsCollection.generateBindings(InjectBindingRegistryImpl.java:108)
	at dagger.internal.codegen.validation.InjectBindingRegistryImpl.generateSourcesForRequiredBindings(InjectBindingRegistryImpl.java:235)
	at dagger.internal.codegen.DelegateComponentProcessor.postRound(DelegateComponentProcessor.java:128)
	at dagger.internal.codegen.KspComponentProcessor.postRound(KspComponentProcessor.java:68)
	at dagger.spi.internal.shaded.androidx.room3.compiler.processing.ksp.KspBasicAnnotationProcessor.process(KspBasicAnnotationProcessor.kt:63)
	at com.google.devtools.ksp.impl.KotlinSymbolProcessing.execute$lambda$3$0(KotlinSymbolProcessing.kt:589)
	at ksp.com.google.devtools.ksp.common.IncrementalContextBase.closeFilesOnException(IncrementalContextBase.kt:424)
	at com.google.devtools.ksp.impl.KotlinSymbolProcessing.execute(KotlinSymbolProcessing.kt:587)
	at com.google.devtools.ksp.impl.KSPLoader$Companion.loadAndRunKSP(KSPLoader.kt:37)
	at com.google.devtools.ksp.impl.KSPLoader.loadAndRunKSP(KSPLoader.kt)
	at com.google.devtools.ksp.gradle.KspAAWorkerAction.execute(KspAATask.kt:872)
	at org.gradle.workers.internal.DefaultWorkerServer.execute(DefaultWorkerServer.java:68)
	at org.gradle.workers.internal.NoIsolationWorkerFactory$1$1.create(NoIsolationWorkerFactory.java:64)
	at org.gradle.workers.internal.NoIsolationWorkerFactory$1$1.create(NoIsolationWorkerFactory.java:61)
	at org.gradle.internal.classloader.ClassLoaderUtils.executeInClassloader(ClassLoaderUtils.java:102)
	at org.gradle.workers.internal.NoIsolationWorkerFactory$1.lambda$execute$0(NoIsolationWorkerFactory.java:61)
	at org.gradle.workers.internal.AbstractWorker$1.call(AbstractWorker.java:44)
	at org.gradle.workers.internal.AbstractWorker$1.call(AbstractWorker.java:41)
	at org.gradle.internal.operations.DefaultBuildOperationRunner$CallableBuildOperationWorker.execute(DefaultBuildOperationRunner.java:210)
	at org.gradle.internal.operations.DefaultBuildOperationRunner$CallableBuildOperationWorker.execute(DefaultBuildOperationRunner.java:205)
	at org.gradle.internal.operations.DefaultBuildOperationRunner$2.execute(DefaultBuildOperationRunner.java:67)
	at org.gradle.internal.operations.DefaultBuildOperationRunner$2.execute(DefaultBuildOperationRunner.java:60)
	at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:167)
	at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:60)
	at org.gradle.internal.operations.DefaultBuildOperationRunner.call(DefaultBuildOperationRunner.java:54)
	at org.gradle.workers.internal.AbstractWorker.executeWrappedInBuildOperation(AbstractWorker.java:41)
	at org.gradle.workers.internal.NoIsolationWorkerFactory$1.execute(NoIsolationWorkerFactory.java:58)
	at org.gradle.workers.internal.DefaultWorkerExecutor.lambda$submitWork$0(DefaultWorkerExecutor.java:174)
	at org.gradle.internal.work.DefaultConditionalExecutionQueue$ExecutionRunner.runExecution(DefaultConditionalExecutionQueue.java:191)
	at org.gradle.internal.work.DefaultConditionalExecutionQueue$ExecutionRunner.access$500(DefaultConditionalExecutionQueue.java:112)
	at org.gradle.internal.work.DefaultConditionalExecutionQueue$ExecutionRunner$1.run(DefaultConditionalExecutionQueue.java:168)
	at org.gradle.internal.work.DefaultWorkerLeaseService.lambda$runAndReleaseLocks$0(DefaultWorkerLeaseService.java:300)
	at org.gradle.internal.work.ResourceLockStatistics$1.measure(ResourceLockStatistics.java:43)
	at org.gradle.internal.work.DefaultWorkerLeaseService.withLocksAcquired(DefaultWorkerLeaseService.java:294)
	at org.gradle.internal.work.DefaultWorkerLeaseService.withLocks(DefaultWorkerLeaseService.java:286)
	at org.gradle.internal.work.DefaultWorkerLeaseService.runAsWorkerThread(DefaultWorkerLeaseService.java:130)
	at org.gradle.internal.work.DefaultWorkerLeaseService.runAsWorkerThread(DefaultWorkerLeaseService.java:135)
	at org.gradle.internal.work.DefaultConditionalExecutionQueue$ExecutionRunner.runBatch(DefaultConditionalExecutionQueue.java:163)
	at org.gradle.internal.work.DefaultConditionalExecutionQueue$ExecutionRunner.run(DefaultConditionalExecutionQueue.java:125)
	... 2 more

Control cases

A direct alias succeeds:

interface MyInterface
typealias TypeAlias = MyInterface

Adding one more alias is sufficient to trigger the failure.

Suspected location

The likely source is XProcessing's KSType.replaceTypeAliases().

When the root declaration is a KSTypeAlias, the function resolves and substitutes that alias once. It then recursively processes only the resulting type's arguments. If the resolved root is itself another KSTypeAlias, it is returned without another root-level expansion. That matches this reproduction: AnotherTypeAlias is expanded to TypeAlias, which subsequently reaches Dagger's accessibility check.

Additional context

This was discovered while retesting google/ksp#1544. That issue's original KSP1 error.NonExistentClass failure succeeds under KSP2 as of the tested 2.0.10-1.0.24 release.

The current assertion is a different failure. The remaining KSTypeAlias in the assertion suggests that only the outer alias was expanded before the type reached the accessibility check.

The affected XProcessing implementation is shaded into Dagger 2.60.1, so applications cannot update it independently.

[bcorso]

@TWiStErRob thanks for reporting this!

I've filed a bug in XProcessing (https://issuetracker.google.com/561698196) and I have a fix that's currently pending review.

Once that's submitted I'll updated the shaded XProcessing jars in Dagger to pull in these changes for the next Dagger release.