Replace deprecated usages of max/min with maxOrNull/minOrNull

build-common/src/org/jetbrains/kotlin/incremental/IncrementalJsCache.kt

@@ -75,7 +75,7 @@ open class IncrementalJsCache(
     override fun markDirty(removedAndCompiledSources: Collection<File>) {
         removedAndCompiledSources.forEach { sourceFile ->
             // The common prefix of all FQN parents has to be the file package
-            sourceToClassesMap[sourceFile].map { it.parentOrNull()?.asString() ?: "" }.minBy { it.length }?.let {
+            sourceToClassesMap[sourceFile].map { it.parentOrNull()?.asString() ?: "" }.minByOrNull { it.length }?.let {
                 packageMetadata.remove(it)
             }
         }

compiler/backend/src/org/jetbrains/kotlin/codegen/inline/ParametersBuilder.kt

@@ -91,7 +91,7 @@ class ParametersBuilder private constructor() {
     }
 
     fun buildParameters(): Parameters {
-        var nextDeclarationIndex = (params.maxBy { it.declarationIndex }?.declarationIndex ?: -1) + 1
+        var nextDeclarationIndex = (params.maxOfOrNull { it.declarationIndex } ?: -1) + 1
 
         return Parameters(params.map { param ->
             if (param is CapturedParamInfo) {

compiler/daemon/daemon-client-new/build.gradle.kts

@@ -1,5 +1,3 @@
-import com.github.jengelman.gradle.plugins.shadow.tasks.ShadowJar
-
 description = "Kotlin Daemon Client New"
 
 plugins {
@@ -49,6 +47,12 @@ dependencies {
     }
 }
 
+tasks.withType<org.jetbrains.kotlin.gradle.dsl.KotlinCompile<*>> {
+    kotlinOptions {
+        apiVersion = "1.3"
+    }
+}
+
 sourceSets {
     "main" { projectDefault() }
     "test" {}

compiler/daemon/daemon-client/build.gradle.kts

@@ -38,6 +38,13 @@ dependencies {
     }
 }
 
+tasks.withType<org.jetbrains.kotlin.gradle.dsl.KotlinCompile<*>> {
+    kotlinOptions {
+        // This module is being run from within Gradle, older versions of which only have kotlin-stdlib 1.3 in the runtime classpath.
+        apiVersion = "1.3"
+    }
+}
+
 sourceSets {
     "main" { projectDefault() }
     "test" {}

compiler/daemon/daemon-tests/test/org/jetbrains/kotlin/daemon/CompilerDaemonTest.kt

@@ -170,7 +170,7 @@ class CompilerDaemonTest : KotlinIntegrationTestBase() {
             val opts2 = configureDaemonJVMOptions(inheritMemoryLimits = false, inheritAdditionalProperties = false, inheritOtherJvmOptions = false)
             assertEquals("300m", opts2.maxMemory)
             assertEquals( -1, DaemonJVMOptionsMemoryComparator().compare(opts, opts2))
-            assertEquals("300m", listOf(opts, opts2).maxWith(DaemonJVMOptionsMemoryComparator())?.maxMemory)
+            assertEquals("300m", listOf(opts, opts2).maxWithOrNull(DaemonJVMOptionsMemoryComparator())?.maxMemory)
 
             val myXmxParam = ManagementFactory.getRuntimeMXBean().inputArguments.first { it.startsWith("-Xmx") }
             TestCase.assertNotNull(myXmxParam)

compiler/daemon/daemon-tests/test/org/jetbrains/kotlin/daemon/experimental/integration/CompilerDaemonTest.kt

@@ -244,7 +244,7 @@ class CompilerDaemonTest : KotlinIntegrationTestBase() {
                 configureDaemonJVMOptions(inheritMemoryLimits = false, inheritAdditionalProperties = false, inheritOtherJvmOptions = false)
             assertEquals("300m", opts2.maxMemory)
             assertEquals(-1, DaemonJVMOptionsMemoryComparator().compare(opts, opts2))
-            assertEquals("300m", listOf(opts, opts2).maxWith(DaemonJVMOptionsMemoryComparator())?.maxMemory)
+            assertEquals("300m", listOf(opts, opts2).maxWithOrNull(DaemonJVMOptionsMemoryComparator())?.maxMemory)
 
             val myXmxParam = ManagementFactory.getRuntimeMXBean().inputArguments.first { it.startsWith("-Xmx") }
             TestCase.assertNotNull(myXmxParam)

compiler/daemon/daemon-tests/test/org/jetbrains/kotlin/daemon/experimental/unit/ConnectionsTest.kt

@@ -229,7 +229,7 @@ class ConnectionsTest : KotlinIntegrationTestBase() {
 
     private fun expectNewDaemon(serverType: ServerType, extraAction: (CompileServiceAsync) -> Unit = {}) = expectDaemon(
         getDaemons = ::getNewDaemonsOrAsyncWrappers,
-        chooseDaemon = { daemons -> daemons.maxWith(comparator)!!.daemon },
+        chooseDaemon = { daemons -> daemons.maxWithOrNull(comparator)!!.daemon },
         getInfo = { d -> runBlocking { d.getDaemonInfo() } },
         registerClient = { d -> runBlocking { d.registerClient(generateClient()) } },
         port = { d -> d.serverPort },

compiler/daemon/src/org/jetbrains/kotlin/daemon/CompileServiceImpl.kt

@@ -1006,7 +1006,7 @@ class CompileServiceImpl(
             val comparator =
                 compareByDescending<DaemonWithMetadata, DaemonJVMOptions>(DaemonJVMOptionsMemoryComparator(), { it.jvmOptions })
                     .thenBy(FileAgeComparator()) { it.runFile }
-            aliveWithOpts.maxWith(comparator)?.let { bestDaemonWithMetadata ->
+            aliveWithOpts.maxWithOrNull(comparator)?.let { bestDaemonWithMetadata ->
                 val fattestOpts = bestDaemonWithMetadata.jvmOptions
                 if (fattestOpts memorywiseFitsInto daemonJVMOptions && FileAgeComparator().compare(
                         bestDaemonWithMetadata.runFile,

compiler/daemon/src/org/jetbrains/kotlin/daemon/experimental/CompileServiceServerSideImpl.kt

@@ -496,7 +496,7 @@ class CompileServiceServerSideImpl(
                     }
                     .thenBy(FileAgeComparator()) { it.runFile }
                     .thenBy { it.daemon.serverPort }
-                aliveWithOpts.maxWith(comparator)?.let { bestDaemonWithMetadata ->
+                aliveWithOpts.maxWithOrNull(comparator)?.let { bestDaemonWithMetadata ->
                     val fattestOpts = bestDaemonWithMetadata.jvmOptions
                     if (fattestOpts memorywiseFitsInto daemonJVMOptions && FileAgeComparator().compare(
                             bestDaemonWithMetadata.runFile,

compiler/fir/modularized-tests/tests/org/jetbrains/kotlin/fir/NonFirResolveModularizedTotalKotlinTest.kt

@@ -118,7 +118,7 @@ class NonFirResolveModularizedTotalKotlinTest : AbstractModularizedTest() {
             totalTime = 0L
         }
 
-        val bestTime = times.min()!!
+        val bestTime = times.minOrNull()!!
         val bestPass = times.indexOf(bestTime)
         dumpTime("Best pass: $bestPass", bestTime)
     }

compiler/frontend/src/org/jetbrains/kotlin/resolve/deprecation/Deprecation.kt

@@ -117,7 +117,7 @@ internal data class DeprecatedByOverridden(private val deprecations: Collection<
         assert(deprecations.none { it is DeprecatedByOverridden })
     }
 
-    override val deprecationLevel: DeprecationLevelValue = deprecations.map(Deprecation::deprecationLevel).min()!!
+    override val deprecationLevel: DeprecationLevelValue = deprecations.map(Deprecation::deprecationLevel).minOrNull()!!
 
     override val target: DeclarationDescriptor
         get() = deprecations.first().target

compiler/frontend/src/org/jetbrains/kotlin/resolve/sinceKotlinUtil.kt

@@ -60,7 +60,7 @@ private data class SinceKotlinValue(
 private fun getSinceKotlinVersionByOverridden(descriptor: CallableMemberDescriptor): SinceKotlinValue? {
     // TODO: combine wasExperimentalMarkerClasses in case of several members with the same minimal API version
     return DescriptorUtils.getAllOverriddenDeclarations(descriptor).map { it.getOwnSinceKotlinVersion() ?: return null }
-        .minBy { it.apiVersion }
+        .minByOrNull { it.apiVersion }
 }
 
 /**

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/types/IrTypeSystemContext.kt

@@ -250,9 +250,9 @@ interface IrTypeSystemContext : TypeSystemContext, TypeSystemCommonSuperTypesCon
     }
 
     override fun SimpleTypeMarker.typeDepth(): Int {
-        val maxInArguments = (this as IrSimpleType).arguments.asSequence().map {
+        val maxInArguments = (this as IrSimpleType).arguments.maxOfOrNull {
             if (it is IrStarProjection) 1 else it.getType().typeDepth()
-        }.max() ?: 0
+        } ?: 0
 
         return maxInArguments + 1
     }

compiler/psi/src/org/jetbrains/kotlin/kdoc/psi/impl/KDocTag.kt

@@ -142,7 +142,7 @@ open class KDocTag(node: ASTNode) : KDocElementImpl(node) {
 
     private fun trimCommonIndent(builder: StringBuilder, prepend4WhiteSpaces: Boolean = false): String {
         val lines = builder.toString().split('\n')
-        val minIndent = lines.filter { it.trim().isNotEmpty() }.map { it.calcIndent() }.min() ?: 0
+        val minIndent = lines.filter { it.trim().isNotEmpty() }.minOfOrNull { it.calcIndent() } ?: 0
         var processedLines = lines.map { it.drop(minIndent) }
         if (prepend4WhiteSpaces)
             processedLines = processedLines.map { if (it.isNotBlank()) it.prependIndent(indentationWhiteSpaces) else it }

compiler/psi/src/org/jetbrains/kotlin/psi/createByPattern.kt

@@ -286,7 +286,7 @@ private fun processPattern(pattern: String, args: List<Any>): PatternData {
     }
 
     if (!ranges.isEmpty()) {
-        val max = ranges.keys.max()!!
+        val max = ranges.keys.maxOrNull()!!
         for (i in 0..max) {
             check(ranges.contains(i), "no '$$i' placeholder")
         }

compiler/resolution/src/org/jetbrains/kotlin/resolve/calls/NewCommonSuperTypeCalculator.kt

@@ -29,7 +29,7 @@ object NewCommonSuperTypeCalculator {
     }
 
     fun TypeSystemCommonSuperTypesContext.commonSuperType(types: List<KotlinTypeMarker>): KotlinTypeMarker {
-        val maxDepth = types.maxBy { it.typeDepth() }?.typeDepth() ?: 0
+        val maxDepth = types.maxOfOrNull { it.typeDepth() } ?: 0
         return commonSuperType(types, -maxDepth, true)
     }
 

compiler/resolution/src/org/jetbrains/kotlin/resolve/calls/tower/ImplicitScopeTower.kt

@@ -22,7 +22,10 @@ import org.jetbrains.kotlin.name.Name
 import org.jetbrains.kotlin.resolve.calls.model.DiagnosticReporter
 import org.jetbrains.kotlin.resolve.calls.model.KotlinCallDiagnostic
 import org.jetbrains.kotlin.resolve.calls.tower.ResolutionCandidateApplicability.*
-import org.jetbrains.kotlin.resolve.scopes.*
+import org.jetbrains.kotlin.resolve.scopes.LexicalScope
+import org.jetbrains.kotlin.resolve.scopes.MemberScope
+import org.jetbrains.kotlin.resolve.scopes.ResolutionScope
+import org.jetbrains.kotlin.resolve.scopes.SyntheticScopes
 import org.jetbrains.kotlin.resolve.scopes.receivers.ReceiverValueWithSmartCastInfo
 import org.jetbrains.kotlin.resolve.scopes.utils.parentsWithSelf
 import org.jetbrains.kotlin.types.KotlinType
@@ -86,8 +89,7 @@ class CandidateWithBoundDispatchReceiver(
 )
 
 fun getResultApplicability(diagnostics: Collection<KotlinCallDiagnostic>) =
-    diagnostics.maxBy { it.candidateApplicability }?.candidateApplicability
+    diagnostics.maxOfOrNull { it.candidateApplicability } ?: RESOLVED
-            ?: RESOLVED
 
 enum class ResolutionCandidateApplicability {
     RESOLVED, // call success or has uncompleted inference or in other words possible successful candidate

compiler/resolution/src/org/jetbrains/kotlin/resolve/calls/tower/TowerResolver.kt

@@ -376,15 +376,14 @@ class TowerResolver {
         }
 
         override fun getFinalCandidates(): Collection<C> {
-            val moreSuitableGroup = candidateGroups.minBy { it.groupApplicability } ?: return emptyList()
+            val moreSuitableGroup = candidateGroups.minByOrNull { it.groupApplicability } ?: return emptyList()
             val groupApplicability = moreSuitableGroup.groupApplicability
             if (groupApplicability == ResolutionCandidateApplicability.HIDDEN) return emptyList()
 
             return moreSuitableGroup.filter { it.resultingApplicability == groupApplicability }
         }
 
-        private val Collection<C>.groupApplicability
+        private val Collection<C>.groupApplicability: ResolutionCandidateApplicability
-            get() =
+            get() = minOfOrNull { it.resultingApplicability } ?: ResolutionCandidateApplicability.HIDDEN
-                minBy { it.resultingApplicability }?.resultingApplicability ?: ResolutionCandidateApplicability.HIDDEN
     }
 }

compiler/tests-common/tests/org/jetbrains/kotlin/cfg/AbstractPseudoValueTest.kt

@@ -79,9 +79,9 @@ abstract class AbstractPseudoValueTest : AbstractPseudocodeTest() {
             valueDescriptions[value to element] = valueDescription(element, value)
         }
 
-        val elementColumnWidth = elementToValues.keys.map { elementText(it).length }.max() ?: 1
+        val elementColumnWidth = elementToValues.keys.maxOfOrNull { elementText(it).length } ?: 1
-        val valueColumnWidth = allValues.map { valueDecl(it).length }.max()!!
+        val valueColumnWidth = allValues.maxOf { valueDecl(it).length }
-        val valueDescColumnWidth = valueDescriptions.values.map { it.length }.max()!!
+        val valueDescColumnWidth = valueDescriptions.values.maxOf { it.length }
 
         for ((ve, description) in valueDescriptions.entries) {
             val (value, element) = ve

compiler/tests-common/tests/org/jetbrains/kotlin/test/util/jetTestUtils.kt

@@ -23,7 +23,6 @@ import com.intellij.util.SmartFMap
 import org.jetbrains.kotlin.psi.KtDeclaration
 import org.jetbrains.kotlin.psi.KtPackageDirective
 import org.jetbrains.kotlin.psi.KtTreeVisitorVoid
-import java.io.File
 
 fun String.trimTrailingWhitespaces(): String =
     this.split('\n').joinToString(separator = "\n") { it.trimEnd() }
@@ -61,10 +60,6 @@ fun PsiFile.findElementsByCommentPrefix(prefix: String): Map<PsiElement, String>
     return result
 }
 
-fun findLastModifiedFile(dir: File, skipFile: (File) -> Boolean): File {
-    return dir.walk().filterNot(skipFile).maxBy { it.lastModified() }!!
-}
-
 val CodeInsightTestFixture.elementByOffset: PsiElement
     get() {
         return file.findElementAt(editor.caretModel.offset) ?: error("Can't find element at offset. Probably <caret> is missing.")

core/descriptors/src/org/jetbrains/kotlin/types/checker/ClassicTypeSystemContext.kt

@@ -291,9 +291,9 @@ interface ClassicTypeSystemContext : TypeSystemInferenceExtensionContext, TypeSy
         require(this is SimpleType, this::errorMessage)
         if (this is TypeUtils.SpecialType) return 0
 
-        val maxInArguments = arguments.asSequence().map {
+        val maxInArguments = arguments.maxOfOrNull {
             if (it.isStarProjection) 1 else it.type.unwrap().typeDepth()
-        }.max() ?: 0
+        } ?: 0
 
         return maxInArguments + 1
     }

core/deserialization/src/org/jetbrains/kotlin/serialization/deserialization/MemberDeserializer.kt

@@ -230,7 +230,7 @@ class MemberDeserializer(private val c: DeserializationContext) {
 
                 else -> CoroutinesCompatibilityMode.COMPATIBLE
             }
-        }.max() ?: CoroutinesCompatibilityMode.COMPATIBLE
+        }.maxOrNull() ?: CoroutinesCompatibilityMode.COMPATIBLE
 
         return maxOf(
             if (isSuspend)

idea/idea-analysis/src/org/jetbrains/kotlin/idea/decompiler/navigation/SourceNavigationHelper.kt

@@ -197,7 +197,7 @@ object SourceNavigationHelper {
     ): T? {
         val classFqName = entity.fqName ?: return null
         return targetScopes(entity, navigationKind).firstNotNullResult { scope ->
-            index.get(classFqName.asString(), entity.project, scope).minBy { it.isExpectDeclaration() }
+            index.get(classFqName.asString(), entity.project, scope).minByOrNull { it.isExpectDeclaration() }
         }
     }
 

idea/idea-analysis/src/org/jetbrains/kotlin/idea/facet/KotlinVersionInfoProvider.kt

@@ -47,7 +47,7 @@ fun getLibraryLanguageLevel(
 ): LanguageVersion {
     val minVersion = getRuntimeLibraryVersions(module, rootModel, platformKind.orDefault())
         .addReleaseVersionIfNecessary(coerceRuntimeLibraryVersionToReleased)
-        .minWith(VersionComparatorUtil.COMPARATOR)
+        .minWithOrNull(VersionComparatorUtil.COMPARATOR)
     return getDefaultLanguageLevel(module, minVersion, coerceRuntimeLibraryVersionToReleased)
 }
 
@@ -60,7 +60,7 @@ fun getDefaultLanguageLevel(
         ?: KotlinVersionInfoProvider.EP_NAME.extensions
             .mapNotNull { it.getCompilerVersion(module) }
             .addReleaseVersionIfNecessary(coerceRuntimeLibraryVersionToReleased)
-            .minWith(VersionComparatorUtil.COMPARATOR)
+            .minWithOrNull(VersionComparatorUtil.COMPARATOR)
         ?: return VersionView.RELEASED_VERSION
     return libVersion.toLanguageVersion()
 }

idea/idea-analysis/src/org/jetbrains/kotlin/idea/highlighter/KotlinPsiChecker.kt

@@ -94,7 +94,7 @@ open class KotlinPsiChecker : AbstractKotlinPsiChecker() {
 }
 
 private fun createQuickFixes(similarDiagnostics: Collection<Diagnostic>): MultiMap<Diagnostic, IntentionAction> {
-    val first = similarDiagnostics.minBy { it.toString() }
+    val first = similarDiagnostics.minByOrNull { it.toString() }
     val factory = similarDiagnostics.first().getRealDiagnosticFactory()
 
     val actions = MultiMap<Diagnostic, IntentionAction>()

idea/idea-completion/src/org/jetbrains/kotlin/idea/completion/CompletionBenchmarkSink.kt

@@ -65,8 +65,8 @@ interface CompletionBenchmarkSink {
             pendingSessions -= completionSession
             perSessionResults[completionSession]?.onEnd(canceled)
             if (pendingSessions.isEmpty()) {
-                val firstFlush = perSessionResults.values.filterNot { results -> results.canceled }.map { it.firstFlush }.min() ?: 0
+                val firstFlush = perSessionResults.values.filterNot { results -> results.canceled }.minOfOrNull { it.firstFlush } ?: 0
-                val full = perSessionResults.values.map { it.full }.max() ?: 0
+                val full = perSessionResults.values.maxOfOrNull { it.full } ?: 0
                 channel.offer(CompletionBenchmarkResults(firstFlush, full))
                 reset()
             }

idea/idea-completion/src/org/jetbrains/kotlin/idea/completion/LookupElementFactory.kt

@@ -335,7 +335,7 @@ class LookupElementFactory(
         if (descriptor.overriddenDescriptors.isNotEmpty()) {
             // Optimization: when one of direct overridden fits, then nothing can fit better
             descriptor.overriddenDescriptors.mapNotNull { it.callableWeightBasedOnReceiver(receiverTypes, onReceiverTypeMismatch = null) }
-                .minBy { it.enum }?.let { return it }
+                .minByOrNull { it.enum }?.let { return it }
 
             val overridden = descriptor.overriddenTreeUniqueAsSequence(useOriginal = false)
             return overridden.map { callableWeightBasic(it, receiverTypes)!! }.minBy { it.enum }!!
@@ -397,7 +397,7 @@ class LookupElementFactory(
         val receiverIndex = bestReceiverType!!.receiverIndex
 
         var receiverIndexToUse: Int? = receiverIndex
-        val maxReceiverIndex = receiverTypes.map { it.receiverIndex }.max()!!
+        val maxReceiverIndex = receiverTypes.maxOf { it.receiverIndex }
         if (maxReceiverIndex > 0) {
             val matchesAllReceivers = (0..maxReceiverIndex).all { it in matchingReceiverIndices }
             if (matchesAllReceivers) { // if descriptor is matching all receivers then use null as receiverIndex - otherwise e.g. all members of Any would have too high priority

idea/idea-completion/src/org/jetbrains/kotlin/idea/completion/smart/NameSimilarity.kt

@@ -20,7 +20,7 @@ object NameSimilarityWeigher : LookupElementWeigher("kotlin.nameSimilarity") {
 }
 
 fun calcNameSimilarity(name: String, expectedInfos: Collection<ExpectedInfo>): Int =
-    expectedInfos.mapNotNull { it.expectedName }.map { calcNameSimilarity(name, it) }.max() ?: 0
+    expectedInfos.mapNotNull { it.expectedName }.maxOfOrNull { calcNameSimilarity(name, it) } ?: 0
 
 private fun calcNameSimilarity(name: String, expectedName: String): Int {
     val words1 = NameUtil.nameToWordsLowerCase(name)

idea/idea-gradle/src/org/jetbrains/kotlin/idea/configuration/KotlinMPPGradleProjectResolver.kt

@@ -431,7 +431,7 @@ open class KotlinMPPGradleProjectResolver : AbstractProjectResolverExtensionComp
                     sourceSetToCompilationData[sourceSet.name]?.let { compilationDataRecords ->
                         it.targetCompatibility = compilationDataRecords
                             .mapNotNull { compilationData -> compilationData.targetCompatibility }
-                            .minWith(VersionComparatorUtil.COMPARATOR)
+                            .minWithOrNull(VersionComparatorUtil.COMPARATOR)
 
                         if (sourceSet.actualPlatforms.getSinglePlatform() == KotlinPlatform.NATIVE) {
                             it.konanTargets = compilationDataRecords

idea/idea-gradle/src/org/jetbrains/kotlin/idea/configuration/klib/KlibInfoProvider.kt

@@ -109,7 +109,7 @@ class KlibInfoProvider(kotlinNativeHome: File) {
             1 -> candidates.single()
             else -> {
                 // there are multiple components, let's take just the first one alphabetically
-                candidates.minBy { it.getName(it.nameCount - 2).toString() }!!
+                candidates.minByOrNull { it.getName(it.nameCount - 2).toString() }!!
             }
         }
     }

idea/idea-jvm/src/org/jetbrains/kotlin/idea/scratch/output/InlayScratchOutputHandler.kt

@@ -106,8 +106,7 @@ class InlayScratchOutputHandler(
         val doc = textEditor.editor.document
         return file.getExpressions()
             .flatMap { it.lineStart..it.lineEnd }
-            .map { doc.getLineEndOffset(it) - doc.getLineStartOffset(it) }
+            .maxOfOrNull { doc.getLineEndOffset(it) - doc.getLineStartOffset(it) } ?: 0
-            .max() ?: 0
     }
 
     private fun clearInlays(editor: TextEditor) {

idea/idea-maven/src/org/jetbrains/kotlin/idea/maven/KotlinMavenArchetypesProvider.kt

@@ -105,7 +105,7 @@ class KotlinMavenArchetypesProvider(private val kotlinPluginVersion: String, pri
             }
 
     private fun chooseVersion(versions: List<MavenArchetype>): MavenArchetype? {
-        return versions.maxBy { MavenVersionComparable(it.version) }
+        return versions.maxByOrNull { MavenVersionComparable(it.version) }
     }
 
     private fun <R> connectAndApply(url: String, timeoutSeconds: Int = 15, block: (HttpURLConnection) -> R): R {

idea/idea-maven/src/org/jetbrains/kotlin/idea/maven/inspections/DifferentMavenStdlibVersionInspection.kt

@@ -73,7 +73,7 @@ class DifferentMavenStdlibVersionInspection : DomElementsInspection<MavenDomProj
     }
 
     private fun createFixes(project: MavenProject, versionElement: GenericDomValue<*>, versions: List<String>): List<SetVersionQuickFix> {
-        val bestVersion = versions.maxBy(::MavenVersionComparable)!!
+        val bestVersion = versions.maxByOrNull(::MavenVersionComparable)!!
         if (bestVersion == versionElement.stringValue) {
             return emptyList()
         }

idea/jvm-debugger/jvm-debugger-test/test/org/jetbrains/kotlin/idea/debugger/test/AbstractSmartStepIntoTest.kt

@@ -57,7 +57,7 @@ abstract class AbstractSmartStepIntoTest : KotlinLightCodeInsightFixtureTestCase
     private fun renderTableWithResults(expected: List<String>, actual: List<String>): String {
         val sb = StringBuilder()
 
-        val maxExtStrSize = (expected.maxBy { it.length }?.length ?: 0) + 5
+        val maxExtStrSize = (expected.maxOfOrNull { it.length } ?: 0) + 5
         val longerList = (if (expected.size < actual.size) actual else expected).sorted()
         val shorterList = (if (expected.size < actual.size) expected else actual).sorted()
         for ((i, element) in longerList.withIndex()) {

idea/jvm-debugger/jvm-debugger-util/src/org/jetbrains/kotlin/idea/debugger/NoStrataPositionManagerHelper.kt

@@ -145,7 +145,7 @@ private fun readClassFileImpl(
 }
 
 private fun findClassFileByPaths(packageName: String, className: String, paths: List<String>): File? =
-    paths.mapNotNull { path -> findClassFileByPath(packageName, className, path) }.maxBy { it.lastModified() }
+    paths.mapNotNull { path -> findClassFileByPath(packageName, className, path) }.maxByOrNull { it.lastModified() }
 
 private fun findClassFileByPath(packageName: String, className: String, outputDirPath: String): File? {
     val outDirFile = File(outputDirPath).takeIf(File::exists) ?: return null

idea/src/org/jetbrains/kotlin/idea/actions/KotlinAddImportAction.kt

@@ -71,7 +71,8 @@ internal fun createSingleImportAction(
     val prioritizer = Prioritizer(element.containingKtFile)
     val variants = fqNames.mapNotNull { fqName ->
         val sameFqNameDescriptors = file.resolveImportReference(fqName)
-        val priority = sameFqNameDescriptors.map { prioritizer.priority(it, file.languageVersionSettings) }.min() ?: return@mapNotNull null
+        val priority = sameFqNameDescriptors.minOfOrNull { prioritizer.priority(it, file.languageVersionSettings) }
+            ?: return@mapNotNull null
         Prioritizer.VariantWithPriority(SingleImportVariant(fqName, sameFqNameDescriptors), priority)
     }.sortedBy { it.priority }.map { it.variant }
 
@@ -90,9 +91,8 @@ internal fun createSingleImportActionForConstructor(
         val sameFqNameDescriptors = file.resolveImportReference(fqName.parent())
             .filterIsInstance<ClassDescriptor>()
             .flatMap { it.constructors }
-
+        val priority = sameFqNameDescriptors.minOfOrNull { prioritizer.priority(it, file.languageVersionSettings) }
-        val priority =
+            ?: return@mapNotNull null
-            sameFqNameDescriptors.asSequence().map { prioritizer.priority(it, file.languageVersionSettings) }.min() ?: return@mapNotNull null
         Prioritizer.VariantWithPriority(SingleImportVariant(fqName, sameFqNameDescriptors), priority)
     }.sortedBy { it.priority }.map { it.variant }
     return KotlinAddImportAction(project, editor, element, variants)
@@ -313,7 +313,7 @@ private class DescriptorGroupPrioritizer(file: KtFile) {
         val descriptors: List<DeclarationDescriptor>,
         languageVersionSettings: LanguageVersionSettings
     ) : Comparable<Priority> {
-        val ownDescriptorsPriority = descriptors.asSequence().map { prioritizer.priority(it, languageVersionSettings) }.max()!!
+        val ownDescriptorsPriority = descriptors.maxOf { prioritizer.priority(it, languageVersionSettings) }
 
         override fun compareTo(other: Priority): Int {
             val c1 = ownDescriptorsPriority.compareTo(other.ownDescriptorsPriority)
@@ -356,7 +356,7 @@ private class SingleImportVariant(
     override val descriptorsToImport: Collection<DeclarationDescriptor>
         get() = listOf(
             descriptors.singleOrNull()
-                ?: descriptors.minBy { if (it is ClassDescriptor) 0 else 1 }
+                ?: descriptors.minByOrNull { if (it is ClassDescriptor) 0 else 1 }
                 ?: error("we create the class with not-empty descriptors always")
         )
 

idea/src/org/jetbrains/kotlin/idea/actions/internal/benchmark/HighlightingBenchmarkAction.kt

@@ -194,7 +194,7 @@ class HighlightingBenchmarkAction : AnAction() {
             .mapNotNull { highlighter ->
                 val info = highlighter.errorStripeTooltip as? HighlightInfo ?: return@mapNotNull null
                 info.severity
-            }.maxWith(Comparator { o1, o2 -> severityRegistrar.compare(o1, o2) })
+            }.maxWithOrNull(severityRegistrar)
         return Result.Success(location, lines, analysisTime, maxSeverity?.myName ?: "clean")
     }
 
@@ -222,5 +222,3 @@ class HighlightingBenchmarkAction : AnAction() {
         e.presentation.isEnabledAndVisible = ApplicationManager.getApplication().isInternal
     }
 }
-
-

idea/src/org/jetbrains/kotlin/idea/codeInsight/KotlinCopyPasteReferenceProcessor.kt

@@ -103,7 +103,7 @@ class KotlinCopyPasteReferenceProcessor : CopyPastePostProcessor<BasicKotlinRefe
 
         val packageName = file.packageDirective?.fqName?.asString() ?: ""
         val imports = file.importDirectives.map { it.text }
-        val endOfImportsOffset = file.importDirectives.map { it.endOffset }.max() ?: file.packageDirective?.endOffset ?: 0
+        val endOfImportsOffset = file.importDirectives.maxOfOrNull { it.endOffset } ?: file.packageDirective?.endOffset ?: 0
         val offsetDelta = if (startOffsets.any { it <= endOfImportsOffset }) 0 else endOfImportsOffset
         val text = file.text.substring(offsetDelta)
         val ranges = startOffsets.indices.map { TextRange(startOffsets[it], endOffsets[it]) }

idea/src/org/jetbrains/kotlin/idea/kdoc/KDocRenderer.kt

@@ -88,7 +88,7 @@ object KDocRenderer {
         fun String.leadingIndent() = indexOfFirst { !it.isWhitespace() }
 
         val lines = text.split('\n')
-        val minIndent = lines.filter { it.trim().isNotEmpty() }.map(String::leadingIndent).min() ?: 0
+        val minIndent = lines.filter { it.trim().isNotEmpty() }.minOfOrNull(String::leadingIndent) ?: 0
         return lines.joinToString("\n") { it.drop(minIndent) }
     }
 

idea/src/org/jetbrains/kotlin/idea/quickfix/SuperClassNotInitialized.kt

@@ -88,7 +88,7 @@ object SuperClassNotInitialized : KotlinIntentionActionsFactory() {
 
                     fun canRenderOnlyFirstParameters(n: Int) = parameterTypes.map { it.take(n) }.toSet().size == parameterTypes.size
 
-                    val maxParams = parameterTypes.asSequence().map { it.size }.max()!!
+                    val maxParams = parameterTypes.maxOf { it.size }
                     val maxParamsToDisplay = if (maxParams <= DISPLAY_MAX_PARAMS) {
                         maxParams
                     } else {

idea/src/org/jetbrains/kotlin/idea/refactoring/changeSignature/KotlinChangeInfo.kt

@@ -36,7 +36,6 @@ import org.jetbrains.kotlin.descriptors.Visibilities
 import org.jetbrains.kotlin.descriptors.Visibility
 import org.jetbrains.kotlin.idea.KotlinLanguage
 import org.jetbrains.kotlin.idea.caches.resolve.util.getJavaOrKotlinMemberDescriptor
-import org.jetbrains.kotlin.idea.caches.resolve.util.javaResolutionFacade
 import org.jetbrains.kotlin.idea.j2k.j2k
 import org.jetbrains.kotlin.idea.project.TargetPlatformDetector
 import org.jetbrains.kotlin.idea.refactoring.changeSignature.KotlinMethodDescriptor.Kind
@@ -45,10 +44,10 @@ import org.jetbrains.kotlin.idea.refactoring.changeSignature.usages.KotlinCaller
 import org.jetbrains.kotlin.idea.resolve.ResolutionFacade
 import org.jetbrains.kotlin.lexer.KtTokens
 import org.jetbrains.kotlin.load.java.JvmAbi
+import org.jetbrains.kotlin.platform.jvm.isJvm
 import org.jetbrains.kotlin.psi.*
 import org.jetbrains.kotlin.resolve.DescriptorToSourceUtils
 import org.jetbrains.kotlin.resolve.DescriptorUtils
-import org.jetbrains.kotlin.platform.jvm.isJvm
 import org.jetbrains.kotlin.resolve.jvm.annotations.findJvmOverloadsAnnotation
 import org.jetbrains.kotlin.resolve.source.getPsi
 import org.jetbrains.kotlin.types.isError
@@ -372,9 +371,9 @@ open class KotlinChangeInfo(
             val currentSignatures = initCurrentSignatures(currentPsiMethods)
             return originalSignatures.associateBy({ it.method }) { originalSignature ->
                 var constrainedCurrentSignatures = currentSignatures.map { it.constrainBy(originalSignature) }
-                val maxMandatoryCount = constrainedCurrentSignatures.maxBy { it.mandatoryParams.size }!!.mandatoryParams.size
+                val maxMandatoryCount = constrainedCurrentSignatures.maxOf { it.mandatoryParams.size }
                 constrainedCurrentSignatures = constrainedCurrentSignatures.filter { it.mandatoryParams.size == maxMandatoryCount }
-                val maxDefaultCount = constrainedCurrentSignatures.maxBy { it.defaultValues.size }!!.defaultValues.size
+                val maxDefaultCount = constrainedCurrentSignatures.maxOf { it.defaultValues.size }
                 constrainedCurrentSignatures.last { it.defaultValues.size == maxDefaultCount }.method
             }
         }

idea/src/org/jetbrains/kotlin/idea/refactoring/changeSignature/ui/KotlinChangeSignatureDialog.kt

@@ -44,9 +44,9 @@ import com.intellij.util.ui.table.JBTableRow
 import com.intellij.util.ui.table.JBTableRowEditor
 import org.jetbrains.kotlin.descriptors.Visibilities
 import org.jetbrains.kotlin.descriptors.Visibility
+import org.jetbrains.kotlin.idea.KotlinBundle
 import org.jetbrains.kotlin.idea.KotlinFileType
 import org.jetbrains.kotlin.idea.caches.resolve.analyze
-import org.jetbrains.kotlin.idea.KotlinBundle
 import org.jetbrains.kotlin.idea.refactoring.changeSignature.*
 import org.jetbrains.kotlin.idea.refactoring.changeSignature.KotlinMethodDescriptor.Kind
 import org.jetbrains.kotlin.idea.refactoring.validateElement
@@ -138,7 +138,7 @@ class KotlinChangeSignatureDialog(
     }
 
     private fun getColumnTextMaxLength(nameFunction: Function1<ParameterTableModelItemBase<KotlinParameterInfo>, String?>) =
-        parametersTableModel.items.asSequence().map { nameFunction(it)?.length ?: 0 }.max() ?: 0
+        parametersTableModel.items.maxOfOrNull { nameFunction(it)?.length ?: 0 } ?: 0
 
     private fun getParamNamesMaxLength() = getColumnTextMaxLength { getPresentationName(it) }
 

idea/src/org/jetbrains/kotlin/idea/refactoring/cutPaste/MoveDeclarationsProcessor.kt

@@ -93,8 +93,8 @@ class MoveDeclarationsProcessor(
 
         // temporary revert imports to the state before they have been changed
         val importsSubstitution = if (sourcePsiFile.importDirectives.size != imports.size) {
-            val startOffset = sourcePsiFile.importDirectives.map { it.startOffset }.min() ?: 0
+            val startOffset = sourcePsiFile.importDirectives.minOfOrNull { it.startOffset } ?: 0
-            val endOffset = sourcePsiFile.importDirectives.map { it.endOffset }.min() ?: 0
+            val endOffset = sourcePsiFile.importDirectives.minOfOrNull { it.endOffset } ?: 0
             val importsDeclarationsText = sourceDocument.getText(TextRange(startOffset, endOffset))
 
             val tempImportsText = imports.joinToString(separator = "\n")

idea/src/org/jetbrains/kotlin/idea/refactoring/introduce/extractionEngine/extractorUtil.kt

@@ -642,9 +642,9 @@ fun ExtractionGeneratorConfiguration.generateDeclaration(
         }
 
         val marginalCandidate = if (insertBefore) {
-            anchorCandidates.minBy { it.startOffset }!!
+            anchorCandidates.minByOrNull { it.startOffset }!!
         } else {
-            anchorCandidates.maxBy { it.startOffset }!!
+            anchorCandidates.maxByOrNull { it.startOffset }!!
         }
 
         // Ascend to the level of targetSibling

idea/src/org/jetbrains/kotlin/idea/refactoring/introduce/introduceUtil.kt

@@ -240,7 +240,7 @@ fun <T : KtDeclaration> insertDeclaration(declaration: T, targetSibling: PsiElem
         anchorCandidates.add(targetSibling.siblings().last { it is KtEnumEntry })
     }
 
-    val anchor = anchorCandidates.minBy { it.startOffset }!!.parentsWithSelf.first { it.parent == targetParent }
+    val anchor = anchorCandidates.minByOrNull { it.startOffset }!!.parentsWithSelf.first { it.parent == targetParent }
     val targetContainer = anchor.parent!!
 
     @Suppress("UNCHECKED_CAST")

idea/tests/org/jetbrains/kotlin/psi/injection/StringInjectionHostTest.kt

@@ -164,11 +164,11 @@ class StringInjectionHostTest : KotlinTestWithEnvironment() {
             assertEquals(decoded, chars.substring(prefix.length))
 
             val extendedOffsets = HashMap(targetToSourceOffsets)
-            val beforeStart = targetToSourceOffsets.keys.min()!! - 1
+            val beforeStart = targetToSourceOffsets.keys.minOrNull()!! - 1
             if (beforeStart >= 0) {
                 extendedOffsets[beforeStart] = -1
             }
-            extendedOffsets[targetToSourceOffsets.keys.max()!! + 1] = -1
+            extendedOffsets[targetToSourceOffsets.keys.maxOrNull()!! + 1] = -1
             for ((target, source) in extendedOffsets) {
                 assertEquals("Wrong source offset for $target", source, escaper.getOffsetInHost(target, range))
             }

nj2k/src/org/jetbrains/kotlin/nj2k/BaseConversion.kt

@@ -5,7 +5,6 @@
 
 package org.jetbrains.kotlin.nj2k
 
-
 import org.jetbrains.kotlin.nj2k.tree.JKTreeElement
 import org.jetbrains.kotlin.nj2k.types.JKTypeFactory
 
@@ -25,6 +24,6 @@ interface SequentialBaseConversion : Conversion {
     fun runConversion(treeRoot: JKTreeElement, context: NewJ2kConverterContext): Boolean
 
     override fun runConversion(treeRoots: Sequence<JKTreeElement>, context: NewJ2kConverterContext): Boolean {
-        return treeRoots.asSequence().map { runConversion(it, context) }.max() ?: false
+        return treeRoots.maxOfOrNull { runConversion(it, context) } ?: false
     }
 }

plugins/kapt3/kapt3-cli/src/help.kt

@@ -17,7 +17,7 @@ internal fun printHelp() {
         .filter { it.cliToolOption != null }
         .map { OptionToRender(it.nameArgs(), it.description) }
 
-    val optionNameColumnWidth = options.asSequence().map { it.nameArgs.length }.max()!! + 2
+    val optionNameColumnWidth = options.maxOf { it.nameArgs.length } + 2
     val renderedOptions = options.joinToString("\n|") { it.render(optionNameColumnWidth) }
 
     val message = """