require(subClass is KtFirSymbol<*>)
        require(superClass is KtFirSymbol<*>)

        if (subClass == superClass) return false
        return isSubClassOf(
            subClass = subClass.firSymbol.fir as FirClass,
            superClass = superClass.firSymbol.fir as FirClass,
            rootModuleSession,

    }

    override fun isSubClassOf(subClass: KtClassOrObjectSymbol, superClass: KtClassOrObjectSymbol): Boolean {
        if (subClass == superClass) return false

        val subClassDescriptor = getSymbolDescriptor(subClass) as? ClassDescriptor ?: return false
        val superClassDescriptor = getSymbolDescriptor(superClass) as? ClassDescriptor ?: return false
        return subClassDescriptor.isSubclassOf(superClassDescriptor)

    override fun createSubstitutor(
        subClass: KtClassOrObjectSymbol,
        superClass: KtClassOrObjectSymbol,
    ): KtSubstitutor? {
        if (subClass == superClass) return KtSubstitutor.Empty(token)

        val baseFirSymbol = subClass.firSymbol
        val superFirSymbol = superClass.firSymbol
        val inheritancePath = collectInheritancePath(baseFirSymbol, superFirSymbol) ?: return null