val packageFragmentProvider = analysisContext.resolveSession.packageFragmentProvider
        return packageFragmentProvider.getSubPackagesOf(owner.fqName, nameFilter)
            .asSequence()
            .map { KtFe10PackageSymbol(it, analysisContext) }
    }

    override fun getConstructors(): Sequence<KtConstructorSymbol> = withValidityAssertion {