else -> throw IllegalStateException("Unsupported japicmp member type '${this::class}'")
    }


/**
 * [CtClass] or [CtMember].
 */
private
typealias CtClassOrCtMember = Any


private
val CtClassOrCtMember.declaringClass: CtClass
    get() = when (this) {
        is CtClass -> declaringClass ?: this
        is CtMember -> declaringClass

    private val metadataVersion = firSession.languageVersionSettings.languageVersion.toMetadataVersion()

    override fun calculateMetadata(ktClass: KtClassOrObject, mapping: Multimap<KtElement, PsiElement>): Metadata {
        val firClass = ktClass.resolveToFirSymbolOfType<FirClassSymbol<*>>(firResolveSession).fir
        firClass.lazyResolveToPhaseWithCallableMembers(FirResolvePhase.STATUS)

            is KtPrimaryConstructor ->
                false // error?
            // no children of secondary constructs are used.
            is KtSecondaryConstructor ->
                false

            // KtClass, KtObjectDeclaration, KtTypeAlias has no expression children
            is KtClassLikeDeclaration ->
                false // has no expression children

            // Simple names do not have expression children