KSP IllegalException "not a valid name" when using AssistedInject with Kotlin value class

[jonapoul]

I'm hitting a build error trying to use assisted injection with a HiltViewModel when injecting a @JvmInline value class.

An example that builds successfully, with a primitive type being injected:

@HiltViewModel(assistedFactory = TestViewModelPrimitive.Factory::class)
class TestViewModelPrimitive @AssistedInject constructor(
  @Assisted private val value: Int,
) : ViewModel() {
  @AssistedFactory
  interface Factory {
    fun create(value: Int): TestViewModelPrimitive
  }
}

and one that fails, when I change the injected parameter to a value class instead:

@HiltViewModel(assistedFactory = TestViewModelValueClass.Factory::class)
class TestViewModelValueClass @AssistedInject constructor(
  @Assisted private val value: MyValueClass,
) : ViewModel() {
  @AssistedFactory
  interface Factory {
    fun create(value: MyValueClass): TestViewModelValueClass
  }
}

@JvmInline
value class MyValueClass(val value: Int)

This fails on the kspDebugKotlin gradle task of my module - stack trace below:

[ksp] java.lang.IllegalArgumentException: not a valid name: create-e7Sson0
	at com.squareup.javapoet.Util.checkArgument(Util.java:53)
	at com.squareup.javapoet.MethodSpec$Builder.setName(MethodSpec.java:315)
	at com.squareup.javapoet.MethodSpec$Builder.<init>(MethodSpec.java:310)
	at com.squareup.javapoet.MethodSpec$Builder.<init>(MethodSpec.java:294)
	at com.squareup.javapoet.MethodSpec.methodBuilder(MethodSpec.java:188)
	at dagger.internal.codegen.xprocessing.MethodSpecs.overriding(MethodSpecs.java:41)
	at dagger.internal.codegen.processingstep.AssistedFactoryProcessingStep$AssistedFactoryImplGenerator.topLevelTypes(AssistedFactoryProcessingStep.java:305)
	at dagger.internal.codegen.processingstep.AssistedFactoryProcessingStep$AssistedFactoryImplGenerator.topLevelTypes(AssistedFactoryProcessingStep.java:230)
	at dagger.internal.codegen.base.SourceFileGenerator.generate(SourceFileGenerator.java:72)
	at dagger.internal.codegen.processingstep.AssistedFactoryProcessingStep.process(AssistedFactoryProcessingStep.java:115)
	at dagger.internal.codegen.processingstep.AssistedFactoryProcessingStep.process(AssistedFactoryProcessingStep.java:78)
	at dagger.internal.codegen.processingstep.TypeCheckingProcessingStep.lambda$process$0(TypeCheckingProcessingStep.java:94)
	at com.google.common.collect.RegularImmutableMap.forEach(RegularImmutableMap.java:297)
	at dagger.internal.codegen.processingstep.TypeCheckingProcessingStep.process(TypeCheckingProcessingStep.java:72)
	at dagger.internal.codegen.processingstep.TypeCheckingProcessingStep.process(TypeCheckingProcessingStep.java:49)
	at dagger.spi.internal.shaded.androidx.room.compiler.processing.XProcessingStep.process(XProcessingStep.kt:57)
	at dagger.spi.internal.shaded.androidx.room.compiler.processing.CommonProcessorDelegate.processRound(XBasicAnnotationProcessor.kt:134)
	at dagger.spi.internal.shaded.androidx.room.compiler.processing.ksp.KspBasicAnnotationProcessor.process(KspBasicAnnotationProcessor.kt:62)
	at com.google.devtools.ksp.AbstractKotlinSymbolProcessingExtension$doAnalysis$8$1.invoke(KotlinSymbolProcessingExtension.kt:320)
	at com.google.devtools.ksp.AbstractKotlinSymbolProcessingExtension$doAnalysis$8$1.invoke(KotlinSymbolProcessingExtension.kt:318)
	at com.google.devtools.ksp.AbstractKotlinSymbolProcessingExtension.handleException(KotlinSymbolProcessingExtension.kt:430)
	at com.google.devtools.ksp.AbstractKotlinSymbolProcessingExtension.doAnalysis(KotlinSymbolProcessingExtension.kt:318)
	at org.jetbrains.kotlin.cli.jvm.compiler.TopDownAnalyzerFacadeForJVM.analyzeFilesWithJavaIntegration(TopDownAnalyzerFacadeForJVM.kt:112)
	at org.jetbrains.kotlin.cli.jvm.compiler.TopDownAnalyzerFacadeForJVM.analyzeFilesWithJavaIntegration$default(TopDownAnalyzerFacadeForJVM.kt:75)
	at org.jetbrains.kotlin.cli.jvm.compiler.KotlinToJVMBytecodeCompiler.analyze$lambda$9(KotlinToJVMBytecodeCompiler.kt:356)
	at org.jetbrains.kotlin.cli.common.messages.AnalyzerWithCompilerReport.analyzeAndReport(AnalyzerWithCompilerReport.kt:112)
	at org.jetbrains.kotlin.cli.jvm.compiler.KotlinToJVMBytecodeCompiler.analyze(KotlinToJVMBytecodeCompiler.kt:347)
	at org.jetbrains.kotlin.cli.jvm.compiler.KotlinToJVMBytecodeCompiler.runFrontendAndGenerateIrUsingClassicFrontend(KotlinToJVMBytecodeCompiler.kt:177)
	at org.jetbrains.kotlin.cli.jvm.compiler.KotlinToJVMBytecodeCompiler.compileModules$cli(KotlinToJVMBytecodeCompiler.kt:102)
	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:169)
	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:43)
	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:102)
	at org.jetbrains.kotlin.cli.common.CLICompiler.exec(CLICompiler.kt:316)
	at org.jetbrains.kotlin.daemon.CompileServiceImpl.compile(CompileServiceImpl.kt:1706)
	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
	at java.rmi/sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:360)
	at java.rmi/sun.rmi.transport.Transport$1.run(Transport.java:200)
	at java.rmi/sun.rmi.transport.Transport$1.run(Transport.java:197)
	at java.base/java.security.AccessController.doPrivileged(AccessController.java:714)
	at java.rmi/sun.rmi.transport.Transport.serviceCall(Transport.java:196)
	at java.rmi/sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:598)
	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:844)
	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:721)
	at java.base/java.security.AccessController.doPrivileged(AccessController.java:400)
	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:720)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642)
	at java.base/java.lang.Thread.run(Thread.java:1583)

I've tried renaming the "create" factory method to various other things, plus renaming the variable and the class name - doesn't seem to affect anything.

This is with:

• KSP v2.1.10-1.0.30
• com.google.dagger.hilt.android plugin applied,
• implementation("com.google.dagger:hilt-android:2.55")
• ksp("com.google.dagger:hilt-compiler:2.55")

Let me know if you need any more info!