ContributesBinding: Binding duplication error doesn't mention the source file

[kevinguitar]

We're facing an error when the binding is duplicated somewhere in the graph. This is reproducible with the code below.

interface ParentInterface
      
@ContributesBinding(Any::class)
class ContributingInterface : ParentInterface
      
@ContributesBinding(Any::class)
class SecondContributingInterface : ParentInterface

The error

> Task :edu:app:kspDebugKotlin FAILED
e: [ksp] java.lang.IllegalStateException: Not possible
        at com.squareup.anvil.compiler.ContributedBindingKt.findHighestPriorityBinding(ContributedBinding.kt:152)
        at com.squareup.anvil.compiler.ContributedBindings$Companion.from(ContributedBinding.kt:94)
        at com.squareup.anvil.compiler.KspContributionMerger.generateDaggerAnnotation(KspContributionMerger.kt:675)
        at com.squareup.anvil.compiler.KspContributionMerger.processClass(KspContributionMerger.kt:326)
        at com.squareup.anvil.compiler.KspContributionMerger.processChecked(KspContributionMerger.kt:260)
        at com.squareup.anvil.compiler.codegen.ksp.AnvilSymbolProcessor.runInternal(AnvilSymbolProcessing.kt:57)
        at com.squareup.anvil.compiler.codegen.ksp.AnvilSymbolProcessor.process(AnvilSymbolProcessing.kt:47)
        at com.squareup.anvil.compiler.ClassScanningKspProcessor.processChecked(ClassScanningKspProcessor.kt:83)
        at com.squareup.anvil.compiler.codegen.ksp.AnvilSymbolProcessor.runInternal(AnvilSymbolProcessing.kt:57)
        at com.squareup.anvil.compiler.codegen.ksp.AnvilSymbolProcessor.process(AnvilSymbolProcessing.kt:47)

I see that there is a test case and it's passing just fine. Maybe it could be related to K2?

The libraries we're using

• kotlin: 2.1.10
• ksp: 2.1.10-1.0.30 (We're not using KSP2 yet)
• anvil-ksp: 0.4.1
• dagger: 2.55