abstract val scope: ResolutionScope

    override fun getCallableSymbols(nameFilter: KtScopeNameFilter): Sequence<KtCallableSymbol> = withValidityAssertion {
        return scope
            .getContributedDescriptors(kindFilter = DescriptorKindFilter.ALL, nameFilter)
            .asSequence()
            .filter { nameFilter(it.name) }
            .mapNotNull { it.toKtSymbol(analysisContext) as? KtCallableSymbol }
    }

            is ConeErrorType -> emptySequence()
            is ConeLookupTagBasedType -> getSubstitutedSuperTypes(shouldApproximate)
            else -> emptySequence()
        }.distinct()
    }

    private fun ConeLookupTagBasedType.getSubstitutedSuperTypes(shouldApproximate: Boolean): Sequence<ConeKotlinType> {

        val memberDescriptor = (getSymbolDescriptor(actual) as? MemberDescriptor)?.takeIf { it.isActual } ?: return emptyList()

        return ExpectedActualResolver.findExpectedForActual(memberDescriptor).orEmpty().asSequence()
            .filter { it.key.isCompatibleOrWeaklyIncompatible }
            .flatMap { it.value }
            .map { it.toKtSymbol(analysisContext) as KtDeclarationSymbol }
            .toList()
    }

        val declarationGenerators = session.extensionService.declarationGenerators

        val generatedTopLevelClassifiers = declarationGenerators
            .asSequence()
            .flatMap {
                // FIXME this function should be called only once during plugin's lifetime, so this usage is not really correct (2)
                it.getTopLevelClassIds()
            }

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

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

    override fun getTopLevelCallableSymbols(packageFqName: FqName, name: Name): Sequence<KtCallableSymbol> {
        val packageViewDescriptor = analysisContext.resolveSession.moduleDescriptor.getPackage(packageFqName)
        return packageViewDescriptor.memberScope.getContributedDescriptors(DescriptorKindFilter.ALL, nameFilter = { it == name })
            .asSequence()
            .filter { it.name == name }

            }
        }
    }

    /**
     * @return the source file and it's source root
     */
    fun sourceFileAndSourceRootFor(sourceFilePath: String): Pair<File, File> =
        sourceRoots.asSequence()
            .map { it.resolve(sourceFilePath) to it }
            .firstOrNull { it.first.isFile }

    }

    private
    fun groovyProjectAccessors(): String {
        val objectMethods = Any::class.java.declaredMethods.toList()
        return Project::class
            .memberFunctions
            .asSequence()
            .mapNotNull { it.javaMethod }
            .filterNot { objectMethods.contains(it) }
            .map { it.toGroovyScriptString() }
            .sorted()
            .joinToString(separator = "\n")

            return@collectDescendantsOfType false
        }

        // Parameter type check
        method.parameterTypes
            .asSequence()
            // Drop the receiver if present
            .drop(if (extensionCandidate) 1 else 0)
            .withIndex()
            .all<IndexedValue<CtClass>> {

      } else {
        // Otherwise the rule is for a public suffix, so we must take one more label.
        domainLabels.size - (rule.size + 1)
      }

    return splitDomain(domain).asSequence().drop(firstLabelOffset).joinToString(".")
  }

  private fun splitDomain(domain: String): List<String> {
    val domainLabels = domain.split('.')

    if (domainLabels.last() == "") {