get() = analysisSession.token

    override fun getResolveExtensionScopeWithTopLevelDeclarations(): KtScope {
        val tools = analysisSession.extensionTools
        if (tools.isEmpty()) return KtEmptyScope(token)
        return KtFirResolveExtensionScope(analysisSession, tools)
    }

    @OptIn(KtModuleStructureInternals::class)
    override fun isResolveExtensionFile(file: VirtualFile): Boolean =

                // Add an empty scope to the shadowed set to give GlobalSearchScope.union something
                // to work with if there are no extension tools.
                // If there are extension tools, any empty scopes, whether from shadowedSearchScope
                // on the extension tools or from this add() call, will be ignored.
                add(GlobalSearchScope.EMPTY_SCOPE)