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override fun visit(root: KtFile) {
    super.visit(root)

    val classVisitor = UnusedClassVisitor()
    root.accept(classVisitor)

    classVisitor.privateClasses
        .filterNot<KtNamedDeclaration> { it.isUsed() }
        .forEach {
            report(CodeSmell(issue, Entity.from(it), "Private class ${it.nameAsSafeName.identifier} is unused."))

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private fun KtNamedDeclaration.isUsed(): Boolean {
    if (nameAsSafeName.identifier in namedClasses) return true
    val pathSegments = fqName?.pathSegments().orEmpty()
    return pathSegments.isNotEmpty() && importedFqNames.any { importedFqName ->
        importedFqName.pathSegments().zip(pathSegments).all { it.first == it.second }
    }
}

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class Solution {

    fun majorityElement(nums: IntArray): Int {
        var count = getInitialCount()
        var candidate = getInitialCandidate()

        for (num in nums) {
            candidate = updateCandidate(count, candidate, num)
            count = updateCount(count, candidate, num)
        }

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if (count == 0) {
    candidate = num
}

if (num == candidate) {
    count++
} else {
    count--
}

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class Solution {

    fun majorityElement(nums: IntArray): Int {
        var count = 0
        var candidate: Int? = null
        for (num in nums) {
            if (count == 0) {
                candidate = num
                count++
            } else {

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private void includeSetupAndTeardownPages() throws Exception {
    includeSetupPages();
    includePageContent();
    includeTeardownPages();
    updatePageContent();
}

private void includeSetupPages() throws Exception {
    if (isSuite)
        includeSuiteSetupPage();

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public static String testableHtml(PageData pageData, boolean includeSuiteSetup) throws Exception {
    WikiPage wikiPage = pageData.getWikiPage();
    StringBuffer buffer = new StringBuffer();
    if (pageData.hasAttribute("Test")) {
        if (includeSuiteSetup) {
            WikiPage suiteSetup = PageCrawlerImpl.getInheritedPage(SuiteResponder.SUITE_SETUP_NAME, wikiPage);
            if (suiteSetup != null) {
                WikiPagePath pagePath = suiteSetup.getPageCrawler().getFullPath(suiteSetup);
                String pagePathName = PathParser.render(pagePath);
                buffer.append("!include -setup .").append(pagePathName).append("\n");

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import io.gitlab.arturbosch.detekt.api.Config
import io.gitlab.arturbosch.detekt.test.assertThat
import io.gitlab.arturbosch.detekt.test.compileAndLintWithContext
import io.gitlab.arturbosch.detekt.test.setupKotlinEnvironment
import org.jetbrains.kotlin.cli.jvm.compiler.KotlinCoreEnvironment
import org.junit.jupiter.api.BeforeAll
import org.junit.jupiter.api.Test

class DoubleNegativeTakeUnlessTest {

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import io.gitlab.arturbosch.detekt.api.*
import org.jetbrains.kotlin.psi.*
import org.jetbrains.kotlin.psi.psiUtil.collectDescendantsOfType

class DoubleNegativeTakeUnless(config: Config = Config.empty) : Rule(config) {

    override val issue = Issue(
        "DoubleNegativeTakeUnless",
        Severity.Style,
        "Using double negatives with `takeUnless` can make the code harder to read.",

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@Test
fun `target is a data class`() {
    val kotlinSource = SourceFile.kotlin(
        "file1.kt", 
        """
    package com.tests.summable
    
    import com.tsongkha.kspexample.annotation.IntSummable

      @IntSummable