*
     * @see KaResolveExtensionFile
     */
    public abstract fun getTopLevelCallableNames(): Set<Name>

    /**
     * Creates the generated Kotlin source file text.
     *
     * The resulted String should be a valid Kotlin code.

    override fun getFileName(): String = fileName
    override fun getFilePackageName(): FqName = packageName
    override fun getTopLevelClassifierNames(): Set<Name> = topLevelClassifiersNames
    override fun getTopLevelCallableNames(): Set<Name> = topLevelCallableNames

    override fun buildFileText(): String = fileText

    private object ResolveExtensionNavigationTargetProviderForTest : KaResolveExtensionNavigationTargetsProvider() {

                }
            }
        }
    }

    override fun getPossibleCallableNames(): Set<Name> = withValidityAssertion {
        tools.flatMapTo(mutableSetOf()) { it.declarationProvider.getTopLevelCallableNames() }
    }

    override fun getPossibleClassifierNames(): Set<Name> = withValidityAssertion {
        tools.flatMapTo(mutableSetOf()) { it.declarationProvider.getTopLevelClassifierNames() }
    }