- Languages of the repository: Kotlin
- Gradle Sonar plugin: 5.0.0.4638
- Android: Java 17 with target 11
- Error observed
Cannot analyse '[redacted source].kt' with 'KtChecksVisitor': declarationDescriptor is null for constructor = {String & T} with class org.jetbrains.kotlin.types.IntersectionTypeConstructor
java.lang.IllegalArgumentException: declarationDescriptor is null for constructor = {String & T} with class org.jetbrains.kotlin.types.IntersectionTypeConstructor
at org.jetbrains.kotlin.js.descriptorUtils.DescriptorUtilsKt.getKotlinTypeFqName(descriptorUtils.kt:26)
at org.sonarsource.kotlin.checks.CollectionShouldBeImmutableCheck.collectReferenceToMutatedCollections(CollectionShouldBeImmutableCheck.kt:156)
- Steps to reproduce
The problematic code was of the form
interface Foo {}
suspend fun <T:Any> bar(lambda: (Foo) -> T): List<String> {
val foo = makeFoo()
return when (val res = lambda(foo)) {
is String -> listOf(res)
is List<*> -> res as List<String>
else -> emptyList()
}
}
- Workaround
None (aside from working out which code is triggering the exception and fixing it 
)