Switch to auto generated IR tree

Co-authored-by: Alexander Udalov <alexander.udalov@jetbrains.com>

.idea/runConfigurations/Generate_IR_tree.xml

@@ -0,0 +1,21 @@
+<component name="ProjectRunConfigurationManager">
+  <configuration default="false" name="Generate IR tree" type="GradleRunConfiguration" factoryName="Gradle" folderName="Generators">
+    <ExternalSystemSettings>
+      <option name="executionName" />
+      <option name="externalProjectPath" value="$PROJECT_DIR$/compiler/ir/ir.tree" />
+      <option name="externalSystemIdString" value="GRADLE" />
+      <option name="scriptParameters" value="" />
+      <option name="taskDescriptions">
+        <list />
+      </option>
+      <option name="taskNames">
+        <list>
+          <option value="generateTree" />
+        </list>
+      </option>
+      <option name="vmOptions" value="" />
+    </ExternalSystemSettings>
+    <GradleScriptDebugEnabled>true</GradleScriptDebugEnabled>
+    <method v="2" />
+  </configuration>
+</component>

compiler/ir/ir.psi2ir/src/org/jetbrains/kotlin/psi2ir/generators/ScriptGenerator.kt

@@ -110,33 +110,35 @@ class ScriptGenerator(declarationGenerator: DeclarationGenerator) : DeclarationG
                 makeParameter(it.thisAsReceiverParameter, IrDeclarationOrigin.SCRIPT_IMPLICIT_RECEIVER, parametersIndex++)
             }
 
-            irScript.providedProperties = descriptor.scriptProvidedProperties.zip(descriptor.scriptProvidedPropertiesParameters)
+            descriptor.scriptProvidedProperties.zip(descriptor.scriptProvidedPropertiesParameters) { providedProperty, parameter ->
-                .map { (providedProperty, parameter) ->
+                // TODO: initializer
-                    // TODO: initializer
+                // TODO: do not keep direct links
-                    // TODO: do not keep direct links
+                val type = providedProperty.type.toIrType()
-                    val type = providedProperty.type.toIrType()
+                val valueParameter = context.symbolTable.declareValueParameter(
-                    val valueParameter = context.symbolTable.declareValueParameter(
+                    UNDEFINED_OFFSET, UNDEFINED_OFFSET,
+                    IrDeclarationOrigin.SCRIPT_PROVIDED_PROPERTY, parameter, type
+                ) { symbol ->
+                    context.irFactory.createValueParameter(
                         UNDEFINED_OFFSET, UNDEFINED_OFFSET,
-                        IrDeclarationOrigin.SCRIPT_PROVIDED_PROPERTY, parameter, type
+                        IrDeclarationOrigin.SCRIPT_PROVIDED_PROPERTY, symbol, descriptor.name,
-                    ) { symbol ->
+                        parametersIndex, type, null, isCrossinline = false, isNoinline = false, isHidden = false, isAssignable = false
-                        context.irFactory.createValueParameter(
+                    ).also { it.parent = irScript }
-                            UNDEFINED_OFFSET, UNDEFINED_OFFSET,
-                            IrDeclarationOrigin.SCRIPT_PROVIDED_PROPERTY, symbol, descriptor.name,
-                            parametersIndex, type, null, isCrossinline = false, isNoinline = false, isHidden = false, isAssignable = false
-                        ).also { it.parent = irScript }
-                    }
-                    parametersIndex++
-                    val irProperty =
-                        PropertyGenerator(declarationGenerator).generateSyntheticProperty(
-                            ktScript,
-                            providedProperty,
-                            valueParameter,
-                            generateSyntheticAccessors = true
-                        )
-                    irProperty.origin = IrDeclarationOrigin.SCRIPT_PROVIDED_PROPERTY
-                    irScript.statements += irProperty
-                    valueParameter to irProperty.symbol
                 }
+                parametersIndex++
+                val irProperty =
+                    PropertyGenerator(declarationGenerator).generateSyntheticProperty(
+                        ktScript,
+                        providedProperty,
+                        valueParameter,
+                        generateSyntheticAccessors = true
+                    )
+                irProperty.origin = IrDeclarationOrigin.SCRIPT_PROVIDED_PROPERTY
+                irScript.statements += irProperty
+                valueParameter to irProperty.symbol
+            }.unzip().let { (params, props) ->
+                irScript.providedProperties = props
+                irScript.providedPropertiesParameters = params
+            }
 
             irScript.constructor = with(IrFunctionBuilder().apply {
                 isPrimary = true
@@ -155,7 +157,7 @@ class ScriptGenerator(declarationGenerator: DeclarationGenerator) : DeclarationG
                     addIfNotNull(irScript.earlierScriptsParameter)
                     addAll(irScript.explicitCallParameters)
                     addAll(irScript.implicitReceiversParameters)
-                    irScript.providedProperties.forEach { add(it.first) }
+                    addAll(irScript.providedPropertiesParameters)
                 }
                 irConstructor.parent = irScript
                 irConstructor.metadata = DescriptorMetadataSource.Function(descriptor.unsubstitutedPrimaryConstructor)

compiler/ir/ir.tree/build.gradle.kts

@@ -1,3 +1,5 @@
+import org.jetbrains.kotlin.ideaExt.idea
+
 plugins {
     kotlin("jvm")
     id("jps-compatible")
@@ -10,10 +12,57 @@ dependencies {
     implementation(project(":compiler:util"))
     implementation(project(":compiler:config"))
 
+    compileOnly(project("tree-generator")) // Provided, so that IDEA can recognize references to this module in KDoc.
     compileOnly(intellijCore())
 }
 
 sourceSets {
-    "main" { projectDefault() }
+    "main" {
+        projectDefault()
+        this.java.srcDir("gen")
+    }
     "test" {}
 }
+
+val generatorClasspath by configurations.creating
+
+dependencies {
+    generatorClasspath(project("tree-generator"))
+}
+
+val generationRoot = projectDir.resolve("gen")
+
+val generateTree by tasks.registering(NoDebugJavaExec::class) {
+
+    val generatorRoot = "$projectDir/tree-generator/src/"
+
+    val generatorConfigurationFiles = fileTree(generatorRoot) {
+        include("**/*.kt")
+    }
+
+    inputs.files(generatorConfigurationFiles)
+    outputs.dirs(generationRoot)
+
+    args(generationRoot)
+    workingDir = rootDir
+    classpath = generatorClasspath
+    main = "org.jetbrains.kotlin.ir.generator.MainKt"
+    systemProperties["line.separator"] = "\n"
+}
+
+val compileKotlin by tasks
+
+compileKotlin.dependsOn(generateTree)
+
+tasks.withType<org.jetbrains.kotlin.gradle.dsl.KotlinCompile<*>> {
+    kotlinOptions {
+        freeCompilerArgs += "-Xinline-classes"
+    }
+}
+
+if (kotlinBuildProperties.isInJpsBuildIdeaSync) {
+    apply(plugin = "idea")
+    idea {
+        this.module.generatedSourceDirs.add(generationRoot)
+    }
+}

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/IrElement.kt

@@ -3,11 +3,18 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir
 
 import org.jetbrains.kotlin.ir.visitors.IrElementTransformer
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitor
 
+/**
+ * A non-leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.rootElement
+ */
 interface IrElement {
     val startOffset: Int
 

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/IrStatement.kt

@@ -3,6 +3,13 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir
 
+/**
+ * A non-leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.statement
+ */
 interface IrStatement : IrElement

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/declarations/IrAnonymousInitializer.kt

@@ -3,6 +3,9 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.declarations
 
 import org.jetbrains.kotlin.descriptors.ClassDescriptor
@@ -12,9 +15,14 @@ import org.jetbrains.kotlin.ir.symbols.IrAnonymousInitializerSymbol
 import org.jetbrains.kotlin.ir.visitors.IrElementTransformer
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitor
 
+/**
+ * A leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.anonymousInitializer
+ */
 abstract class IrAnonymousInitializer : IrDeclarationBase() {
     @ObsoleteDescriptorBasedAPI
-    abstract override val descriptor: ClassDescriptor // TODO special descriptor for anonymous initializer blocks
+    abstract override val descriptor: ClassDescriptor
+
     abstract override val symbol: IrAnonymousInitializerSymbol
 
     abstract val isStatic: Boolean

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/declarations/IrAttributeContainer.kt

@@ -3,17 +3,17 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.declarations
 
 import org.jetbrains.kotlin.ir.IrElement
 
+/**
+ * A non-leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.attributeContainer
+ */
 interface IrAttributeContainer : IrElement {
-    /**
-     * An object which can be used as a key in the map in the backend-specific storage. If a brand new IR element is created, this property
-     * should be equal to that element itself. If an element is copied from some other element, its id should be copied as well.
-     *
-     * Note that an [attributeOwnerId] of any element must be an element, whose [attributeOwnerId] is itself. In other words,
-     * it shouldn't be needed to call this more than once to find the original attribute owner.
-     */
     var attributeOwnerId: IrAttributeContainer
 }

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/declarations/IrClass.kt

@@ -3,9 +3,16 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.declarations
 
-import org.jetbrains.kotlin.descriptors.*
+import org.jetbrains.kotlin.descriptors.ClassDescriptor
+import org.jetbrains.kotlin.descriptors.ClassKind
+import org.jetbrains.kotlin.descriptors.Modality
+import org.jetbrains.kotlin.descriptors.SourceElement
+import org.jetbrains.kotlin.descriptors.ValueClassRepresentation
 import org.jetbrains.kotlin.ir.ObsoleteDescriptorBasedAPI
 import org.jetbrains.kotlin.ir.symbols.IrClassSymbol
 import org.jetbrains.kotlin.ir.types.IrSimpleType
@@ -15,21 +22,32 @@ import org.jetbrains.kotlin.ir.util.transformInPlace
 import org.jetbrains.kotlin.ir.visitors.IrElementTransformer
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitor
 
-abstract class IrClass :
+/**
-    IrDeclarationBase(), IrPossiblyExternalDeclaration, IrDeclarationWithVisibility,
+ * A leaf IR tree element.
-    IrDeclarationContainer, IrTypeParametersContainer, IrAttributeContainer, IrMetadataSourceOwner {
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.class
-
+ */
+abstract class IrClass : IrDeclarationBase(), IrPossiblyExternalDeclaration,
+        IrDeclarationWithVisibility, IrTypeParametersContainer, IrDeclarationContainer,
+        IrAttributeContainer, IrMetadataSourceOwner {
     @ObsoleteDescriptorBasedAPI
     abstract override val descriptor: ClassDescriptor
+
     abstract override val symbol: IrClassSymbol
 
     abstract val kind: ClassKind
+
     abstract var modality: Modality
+
     abstract val isCompanion: Boolean
+
     abstract val isInner: Boolean
+
     abstract val isData: Boolean
+
     abstract val isValue: Boolean
+
     abstract val isExpect: Boolean
+
     abstract val isFun: Boolean
 
     abstract val source: SourceElement

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/declarations/IrConstructor.kt

@@ -3,6 +3,9 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.declarations
 
 import org.jetbrains.kotlin.descriptors.ClassConstructorDescriptor
@@ -10,9 +13,14 @@ import org.jetbrains.kotlin.ir.ObsoleteDescriptorBasedAPI
 import org.jetbrains.kotlin.ir.symbols.IrConstructorSymbol
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitor
 
+/**
+ * A leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.constructor
+ */
 abstract class IrConstructor : IrFunction() {
     @ObsoleteDescriptorBasedAPI
     abstract override val descriptor: ClassConstructorDescriptor
+
     abstract override val symbol: IrConstructorSymbol
 
     abstract val isPrimary: Boolean

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/declarations/IrDeclaration.kt

@@ -3,12 +3,19 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.declarations
 
 import org.jetbrains.kotlin.descriptors.DeclarationDescriptor
 import org.jetbrains.kotlin.ir.IrStatement
 import org.jetbrains.kotlin.ir.ObsoleteDescriptorBasedAPI
 
+/**
+ * A non-leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.declaration
+ */
 interface IrDeclaration : IrStatement, IrSymbolOwner, IrMutableAnnotationContainer {
     @ObsoleteDescriptorBasedAPI
     val descriptor: DeclarationDescriptor

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/declarations/IrDeclarationBase.kt

@@ -1,10 +1,17 @@
 /*
- * Copyright 2010-2022 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2021 JetBrains s.r.o. and Kotlin Programming Language contributors.
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.declarations
 
 import org.jetbrains.kotlin.ir.IrElementBase
 
+/**
+ * A non-leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.declarationBase
+ */
 abstract class IrDeclarationBase : IrElementBase(), IrDeclaration

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/declarations/IrDeclarationContainer.kt

@@ -3,8 +3,16 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.declarations
 
+
+/**
+ * A non-leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.declarationContainer
+ */
 interface IrDeclarationContainer : IrDeclarationParent {
     val declarations: MutableList<IrDeclaration>
 }

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/declarations/IrDeclarationParent.kt

@@ -1,10 +1,17 @@
 /*
- * Copyright 2010-2022 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2021 JetBrains s.r.o. and Kotlin Programming Language contributors.
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.declarations
 
 import org.jetbrains.kotlin.ir.IrElement
 
+/**
+ * A non-leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.declarationParent
+ */
 interface IrDeclarationParent : IrElement

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/declarations/IrDeclarationWithName.kt

@@ -1,12 +1,19 @@
 /*
- * Copyright 2010-2022 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2021 JetBrains s.r.o. and Kotlin Programming Language contributors.
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.declarations
 
 import org.jetbrains.kotlin.name.Name
 
+/**
+ * A non-leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.declarationWithName
+ */
 interface IrDeclarationWithName : IrDeclaration {
     var name: Name
 }

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/declarations/IrDeclarationWithVisibility.kt

@@ -1,12 +1,19 @@
 /*
- * Copyright 2010-2022 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2021 JetBrains s.r.o. and Kotlin Programming Language contributors.
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.declarations
 
 import org.jetbrains.kotlin.descriptors.DescriptorVisibility
 
+/**
+ * A non-leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.declarationWithVisibility
+ */
 interface IrDeclarationWithVisibility : IrDeclaration {
     var visibility: DescriptorVisibility
 }

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/declarations/IrEnumEntry.kt

@@ -3,6 +3,9 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.declarations
 
 import org.jetbrains.kotlin.descriptors.ClassDescriptor
@@ -12,14 +15,20 @@ import org.jetbrains.kotlin.ir.symbols.IrEnumEntrySymbol
 import org.jetbrains.kotlin.ir.visitors.IrElementTransformer
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitor
 
+/**
+ * A leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.enumEntry
+ */
 abstract class IrEnumEntry : IrDeclarationBase(), IrDeclarationWithName {
     @ObsoleteDescriptorBasedAPI
     abstract override val descriptor: ClassDescriptor
+
     abstract override val symbol: IrEnumEntrySymbol
 
-    abstract var correspondingClass: IrClass?
     abstract var initializerExpression: IrExpressionBody?
 
+    abstract var correspondingClass: IrClass?
+
     override fun <R, D> accept(visitor: IrElementVisitor<R, D>, data: D): R =
         visitor.visitEnumEntry(this, data)
 

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/declarations/IrErrorDeclaration.kt

@@ -3,15 +3,22 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.declarations
 
 import org.jetbrains.kotlin.ir.symbols.IrSymbol
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitor
 
+/**
+ * A leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.errorDeclaration
+ */
 abstract class IrErrorDeclaration : IrDeclarationBase() {
-    override fun <R, D> accept(visitor: IrElementVisitor<R, D>, data: D): R =
-        visitor.visitErrorDeclaration(this, data)
-
     override val symbol: IrSymbol
         get() = error("Should never be called")
+
+    override fun <R, D> accept(visitor: IrElementVisitor<R, D>, data: D): R =
+        visitor.visitErrorDeclaration(this, data)
 }

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/declarations/IrExternalPackageFragment.kt

@@ -3,6 +3,9 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.declarations
 
 import org.jetbrains.kotlin.ir.symbols.IrExternalPackageFragmentSymbol
@@ -11,8 +14,13 @@ import org.jetbrains.kotlin.ir.visitors.IrElementTransformer
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitor
 import org.jetbrains.kotlin.serialization.deserialization.descriptors.DeserializedContainerSource
 
+/**
+ * A leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.externalPackageFragment
+ */
 abstract class IrExternalPackageFragment : IrPackageFragment() {
     abstract override val symbol: IrExternalPackageFragmentSymbol
+
     abstract val containerSource: DeserializedContainerSource?
 
     override fun <R, D> accept(visitor: IrElementVisitor<R, D>, data: D): R =

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/declarations/IrFakeOverrideFunction.kt

@@ -3,17 +3,24 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.declarations
 
 import org.jetbrains.kotlin.descriptors.Modality
 import org.jetbrains.kotlin.ir.symbols.IrSimpleFunctionSymbol
 
+/**
+ * A leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.fakeOverrideFunction
+ */
 interface IrFakeOverrideFunction : IrDeclaration {
     override val symbol: IrSimpleFunctionSymbol
 
     var modality: Modality
 
-    fun acquireSymbol(symbol: IrSimpleFunctionSymbol): IrSimpleFunction
-
     val isBound: Boolean
+
+    fun acquireSymbol(symbol: IrSimpleFunctionSymbol): IrSimpleFunction
 }

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/declarations/IrFakeOverrideProperty.kt

@@ -3,19 +3,28 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.declarations
 
 import org.jetbrains.kotlin.descriptors.Modality
 import org.jetbrains.kotlin.ir.symbols.IrPropertySymbol
 
+/**
+ * A leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.fakeOverrideProperty
+ */
 interface IrFakeOverrideProperty : IrDeclaration {
     override val symbol: IrPropertySymbol
 
     var modality: Modality
+
     var getter: IrSimpleFunction?
+
     var setter: IrSimpleFunction?
 
-    fun acquireSymbol(symbol: IrPropertySymbol): IrProperty
-
     val isBound: Boolean
+
+    fun acquireSymbol(symbol: IrPropertySymbol): IrProperty
 }

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/declarations/IrField.kt

@@ -3,6 +3,9 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.declarations
 
 import org.jetbrains.kotlin.descriptors.PropertyDescriptor
@@ -14,16 +17,21 @@ import org.jetbrains.kotlin.ir.types.IrType
 import org.jetbrains.kotlin.ir.visitors.IrElementTransformer
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitor
 
-abstract class IrField :
+/**
-    IrDeclarationBase(),
+ * A leaf IR tree element.
-    IrPossiblyExternalDeclaration, IrDeclarationWithVisibility, IrDeclarationParent, IrMetadataSourceOwner {
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.field
-
+ */
+abstract class IrField : IrDeclarationBase(), IrPossiblyExternalDeclaration,
+        IrDeclarationWithVisibility, IrDeclarationParent, IrMetadataSourceOwner {
     @ObsoleteDescriptorBasedAPI
     abstract override val descriptor: PropertyDescriptor
+
     abstract override val symbol: IrFieldSymbol
 
     abstract var type: IrType
+
     abstract val isFinal: Boolean
+
     abstract val isStatic: Boolean
 
     abstract var initializer: IrExpressionBody?

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/declarations/IrFile.kt

@@ -3,6 +3,9 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.declarations
 
 import org.jetbrains.kotlin.ir.IrFileEntry
@@ -11,7 +14,12 @@ import org.jetbrains.kotlin.ir.util.transformInPlace
 import org.jetbrains.kotlin.ir.visitors.IrElementTransformer
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitor
 
-abstract class IrFile : IrPackageFragment(), IrMutableAnnotationContainer, IrMetadataSourceOwner {
+/**
+ * A leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.file
+ */
+abstract class IrFile : IrPackageFragment(), IrMetadataSourceOwner,
+        IrMutableAnnotationContainer {
     abstract override val symbol: IrFileSymbol
 
     abstract val module: IrModuleFragment

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/declarations/IrFunction.kt

@@ -3,6 +3,9 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.declarations
 
 import org.jetbrains.kotlin.descriptors.FunctionDescriptor
@@ -14,49 +17,47 @@ import org.jetbrains.kotlin.ir.util.transformIfNeeded
 import org.jetbrains.kotlin.ir.visitors.IrElementTransformer
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitor
 
-abstract class IrFunction :
+/**
-    IrDeclarationBase(),
+ * A non-leaf IR tree element.
-    IrPossiblyExternalDeclaration, IrDeclarationWithVisibility, IrTypeParametersContainer, IrSymbolOwner, IrDeclarationParent, IrReturnTarget,
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.function
-    IrMemberWithContainerSource,
+ */
-    IrMetadataSourceOwner {
+abstract class IrFunction : IrDeclarationBase(), IrPossiblyExternalDeclaration,
-
+        IrDeclarationWithVisibility, IrTypeParametersContainer, IrSymbolOwner, IrDeclarationParent,
+        IrReturnTarget, IrMemberWithContainerSource, IrMetadataSourceOwner {
     @ObsoleteDescriptorBasedAPI
     abstract override val descriptor: FunctionDescriptor
+
     abstract override val symbol: IrFunctionSymbol
 
-    abstract val isInline: Boolean // NB: there's an inline constructor for Array and each primitive array class
+    abstract val isInline: Boolean
+
     abstract val isExpect: Boolean
 
     abstract var returnType: IrType
 
     abstract var dispatchReceiverParameter: IrValueParameter?
+
     abstract var extensionReceiverParameter: IrValueParameter?
+
     abstract var valueParameters: List<IrValueParameter>
 
-    /**
-     * The first `contextReceiverParametersCount` value parameters are context receivers
-     */
     abstract var contextReceiverParametersCount: Int
 
     abstract var body: IrBody?
 
     override fun <D> acceptChildren(visitor: IrElementVisitor<Unit, D>, data: D) {
         typeParameters.forEach { it.accept(visitor, data) }
-
         dispatchReceiverParameter?.accept(visitor, data)
         extensionReceiverParameter?.accept(visitor, data)
         valueParameters.forEach { it.accept(visitor, data) }
-
         body?.accept(visitor, data)
     }
 
     override fun <D> transformChildren(transformer: IrElementTransformer<D>, data: D) {
         typeParameters = typeParameters.transformIfNeeded(transformer, data)
-
         dispatchReceiverParameter = dispatchReceiverParameter?.transform(transformer, data)
         extensionReceiverParameter = extensionReceiverParameter?.transform(transformer, data)
         valueParameters = valueParameters.transformIfNeeded(transformer, data)
-
         body = body?.transform(transformer, data)
     }
 }

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/declarations/IrLocalDelegatedProperty.kt

@@ -3,6 +3,9 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.declarations
 
 import org.jetbrains.kotlin.descriptors.VariableDescriptorWithAccessors
@@ -12,21 +15,25 @@ import org.jetbrains.kotlin.ir.types.IrType
 import org.jetbrains.kotlin.ir.visitors.IrElementTransformer
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitor
 
-abstract class IrLocalDelegatedProperty :
+/**
-    IrDeclarationBase(),
+ * A leaf IR tree element.
-    IrDeclarationWithName,
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.localDelegatedProperty
-    IrSymbolOwner,
+ */
-    IrMetadataSourceOwner {
+abstract class IrLocalDelegatedProperty : IrDeclarationBase(), IrDeclarationWithName,
-
+        IrSymbolOwner, IrMetadataSourceOwner {
     @ObsoleteDescriptorBasedAPI
     abstract override val descriptor: VariableDescriptorWithAccessors
+
     abstract override val symbol: IrLocalDelegatedPropertySymbol
 
     abstract var type: IrType
+
     abstract val isVar: Boolean
 
     abstract var delegate: IrVariable
+
     abstract var getter: IrSimpleFunction
+
     abstract var setter: IrSimpleFunction?
 
     override fun <R, D> accept(visitor: IrElementVisitor<R, D>, data: D): R =

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/declarations/IrMemberWithContainerSource.kt

@@ -1,12 +1,19 @@
 /*
- * Copyright 2010-2022 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2021 JetBrains s.r.o. and Kotlin Programming Language contributors.
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.declarations
 
 import org.jetbrains.kotlin.serialization.deserialization.descriptors.DeserializedContainerSource
 
+/**
+ * A non-leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.memberWithContainerSource
+ */
 interface IrMemberWithContainerSource : IrDeclarationWithName {
     val containerSource: DeserializedContainerSource?
 }

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/declarations/IrMetadataSourceOwner.kt

@@ -1,12 +1,19 @@
 /*
- * Copyright 2010-2022 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2021 JetBrains s.r.o. and Kotlin Programming Language contributors.
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.declarations
 
 import org.jetbrains.kotlin.ir.IrElement
 
+/**
+ * A non-leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.metadataSourceOwner
+ */
 interface IrMetadataSourceOwner : IrElement {
     var metadata: MetadataSource?
 }

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/declarations/IrModuleFragment.kt

@@ -3,10 +3,14 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.declarations
 
 import org.jetbrains.kotlin.descriptors.ModuleDescriptor
 import org.jetbrains.kotlin.ir.IrBuiltIns
+import org.jetbrains.kotlin.ir.IrElement
 import org.jetbrains.kotlin.ir.IrElementBase
 import org.jetbrains.kotlin.ir.UNDEFINED_OFFSET
 import org.jetbrains.kotlin.ir.util.transformInPlace
@@ -14,10 +18,17 @@ import org.jetbrains.kotlin.ir.visitors.IrElementTransformer
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitor
 import org.jetbrains.kotlin.name.Name
 
-abstract class IrModuleFragment : IrElementBase() {
+/**
-    abstract val name: Name
+ * A leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.moduleFragment
+ */
+abstract class IrModuleFragment : IrElementBase(), IrElement {
     abstract val descriptor: ModuleDescriptor
+
+    abstract val name: Name
+
     abstract val irBuiltins: IrBuiltIns
+
     abstract val files: MutableList<IrFile>
 
     override val startOffset: Int
@@ -29,8 +40,8 @@ abstract class IrModuleFragment : IrElementBase() {
     override fun <R, D> accept(visitor: IrElementVisitor<R, D>, data: D): R =
         visitor.visitModuleFragment(this, data)
 
-    override fun <D> transform(transformer: IrElementTransformer<D>, data: D): IrModuleFragment =
+    override fun <D> transform(transformer: IrElementTransformer<D>, data: D):
-        accept(transformer, data) as IrModuleFragment
+            IrModuleFragment = accept(transformer, data) as IrModuleFragment
 
     override fun <D> acceptChildren(visitor: IrElementVisitor<Unit, D>, data: D) {
         files.forEach { it.accept(visitor, data) }

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/declarations/IrOverridableDeclaration.kt

@@ -1,14 +1,23 @@
 /*
- * Copyright 2010-2022 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2021 JetBrains s.r.o. and Kotlin Programming Language contributors.
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.declarations
 
 import org.jetbrains.kotlin.ir.symbols.IrSymbol
 
+/**
+ * A non-leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.overridableDeclaration
+ */
 interface IrOverridableDeclaration<S : IrSymbol> : IrOverridableMember {
     override val symbol: S
+
     val isFakeOverride: Boolean
+
     var overriddenSymbols: List<S>
 }

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/declarations/IrOverridableMember.kt

@@ -1,12 +1,20 @@
 /*
- * Copyright 2010-2022 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2021 JetBrains s.r.o. and Kotlin Programming Language contributors.
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.declarations
 
 import org.jetbrains.kotlin.descriptors.Modality
 
-interface IrOverridableMember : IrDeclarationWithVisibility, IrDeclarationWithName, IrSymbolOwner {
+/**
+ * A non-leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.overridableMember
+ */
+interface IrOverridableMember : IrDeclaration, IrDeclarationWithVisibility,
+        IrDeclarationWithName, IrSymbolOwner {
     val modality: Modality
 }

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/declarations/IrPackageFragment.kt

@@ -3,6 +3,9 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.declarations
 
 import org.jetbrains.kotlin.descriptors.PackageFragmentDescriptor
@@ -11,10 +14,15 @@ import org.jetbrains.kotlin.ir.ObsoleteDescriptorBasedAPI
 import org.jetbrains.kotlin.ir.symbols.IrPackageFragmentSymbol
 import org.jetbrains.kotlin.name.FqName
 
+/**
+ * A non-leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.packageFragment
+ */
 abstract class IrPackageFragment : IrElementBase(), IrDeclarationContainer, IrSymbolOwner {
+    abstract override val symbol: IrPackageFragmentSymbol
+
     @ObsoleteDescriptorBasedAPI
     abstract val packageFragmentDescriptor: PackageFragmentDescriptor
-    abstract override val symbol: IrPackageFragmentSymbol
 
     abstract val fqName: FqName
 }

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/declarations/IrPossiblyExternalDeclaration.kt

@@ -1,10 +1,18 @@
 /*
- * Copyright 2010-2022 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2021 JetBrains s.r.o. and Kotlin Programming Language contributors.
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.declarations
 
+
+/**
+ * A non-leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.possiblyExternalDeclaration
+ */
 interface IrPossiblyExternalDeclaration : IrDeclarationWithName {
     val isExternal: Boolean
 }

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/declarations/IrProperty.kt

@@ -3,6 +3,9 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.declarations
 
 import org.jetbrains.kotlin.descriptors.PropertyDescriptor
@@ -11,27 +14,34 @@ import org.jetbrains.kotlin.ir.symbols.IrPropertySymbol
 import org.jetbrains.kotlin.ir.visitors.IrElementTransformer
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitor
 
-abstract class IrProperty :
+/**
-    IrDeclarationBase(),
+ * A leaf IR tree element.
-    IrPossiblyExternalDeclaration,
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.property
-    IrOverridableDeclaration<IrPropertySymbol>,
+ */
-    IrMetadataSourceOwner,
+abstract class IrProperty : IrDeclarationBase(), IrPossiblyExternalDeclaration,
-    IrAttributeContainer,
+        IrOverridableDeclaration<IrPropertySymbol>, IrMetadataSourceOwner, IrAttributeContainer,
-    IrMemberWithContainerSource {
+        IrMemberWithContainerSource {
-
     @ObsoleteDescriptorBasedAPI
     abstract override val descriptor: PropertyDescriptor
+
     abstract override val symbol: IrPropertySymbol
 
     abstract val isVar: Boolean
+
     abstract val isConst: Boolean
+
     abstract val isLateinit: Boolean
+
     abstract val isDelegated: Boolean
+
     abstract val isExpect: Boolean
+
     abstract override val isFakeOverride: Boolean
 
     abstract var backingField: IrField?
+
     abstract var getter: IrSimpleFunction?
+
     abstract var setter: IrSimpleFunction?
 
     override fun <R, D> accept(visitor: IrElementVisitor<R, D>, data: D): R =
@@ -45,7 +55,7 @@ abstract class IrProperty :
 
     override fun <D> transformChildren(transformer: IrElementTransformer<D>, data: D) {
         backingField = backingField?.transform(transformer, data) as? IrField
-        getter = getter?.run { transform(transformer, data) as IrSimpleFunction }
+        getter = getter?.transform(transformer, data) as? IrSimpleFunction
-        setter = setter?.run { transform(transformer, data) as IrSimpleFunction }
+        setter = setter?.transform(transformer, data) as? IrSimpleFunction
     }
 }

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/declarations/IrReturnTarget.kt

@@ -3,12 +3,19 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.declarations
 
 import org.jetbrains.kotlin.descriptors.FunctionDescriptor
 import org.jetbrains.kotlin.ir.ObsoleteDescriptorBasedAPI
 import org.jetbrains.kotlin.ir.symbols.IrReturnTargetSymbol
 
+/**
+ * A non-leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.returnTarget
+ */
 interface IrReturnTarget : IrSymbolOwner {
     @ObsoleteDescriptorBasedAPI
     val descriptor: FunctionDescriptor

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/declarations/IrScript.kt

@@ -3,6 +3,9 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.declarations
 
 import org.jetbrains.kotlin.ir.expressions.IrStatementContainer
@@ -10,20 +13,19 @@ import org.jetbrains.kotlin.ir.symbols.IrClassSymbol
 import org.jetbrains.kotlin.ir.symbols.IrPropertySymbol
 import org.jetbrains.kotlin.ir.symbols.IrScriptSymbol
 import org.jetbrains.kotlin.ir.types.IrType
+import org.jetbrains.kotlin.ir.util.transformIfNeeded
 import org.jetbrains.kotlin.ir.util.transformInPlace
 import org.jetbrains.kotlin.ir.visitors.IrElementTransformer
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitor
 
-//TODO: make IrScript as IrPackageFragment, because script is used as a file, not as a class
+/**
-//NOTE: declarations and statements stored separately
+ * A leaf IR tree element.
-abstract class IrScript :
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.script
-    IrDeclarationBase(), IrDeclarationWithName,
+ */
-    IrDeclarationParent, IrStatementContainer, IrMetadataSourceOwner {
+abstract class IrScript : IrDeclarationBase(), IrDeclarationWithName, IrDeclarationParent,
-
+        IrStatementContainer, IrMetadataSourceOwner {
     abstract override val symbol: IrScriptSymbol
 
-    // NOTE: is the result of the FE conversion, because there script interpreted as a class and has receiver
-    // TODO: consider removing from here and handle appropriately in the lowering
     abstract var thisReceiver: IrValueParameter
 
     abstract var baseClass: IrType
@@ -32,7 +34,9 @@ abstract class IrScript :
 
     abstract var implicitReceiversParameters: List<IrValueParameter>
 
-    abstract var providedProperties: List<Pair<IrValueParameter, IrPropertySymbol>>
+    abstract var providedProperties: List<IrPropertySymbol>
+
+    abstract var providedPropertiesParameters: List<IrValueParameter>
 
     abstract var resultProperty: IrPropertySymbol?
 
@@ -52,16 +56,18 @@ abstract class IrScript :
         thisReceiver.accept(visitor, data)
         explicitCallParameters.forEach { it.accept(visitor, data) }
         implicitReceiversParameters.forEach { it.accept(visitor, data) }
-        providedProperties.forEach { it.first.accept(visitor, data) }
+        providedPropertiesParameters.forEach { it.accept(visitor, data) }
         earlierScriptsParameter?.accept(visitor, data)
     }
 
     override fun <D> transformChildren(transformer: IrElementTransformer<D>, data: D) {
         statements.transformInPlace(transformer, data)
         thisReceiver = thisReceiver.transform(transformer, data)
-        explicitCallParameters = explicitCallParameters.map { it.transform(transformer, data) }
+        explicitCallParameters = explicitCallParameters.transformIfNeeded(transformer, data)
-        implicitReceiversParameters = implicitReceiversParameters.map { it.transform(transformer, data) }
+        implicitReceiversParameters = implicitReceiversParameters.transformIfNeeded(transformer,
-        providedProperties = providedProperties.map { it.first.transform(transformer, data) to it.second }
+                data)
+        providedPropertiesParameters = providedPropertiesParameters.transformIfNeeded(transformer,
+                data)
         earlierScriptsParameter = earlierScriptsParameter?.transform(transformer, data)
     }
 }

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/declarations/IrSimpleFunction.kt

@@ -3,23 +3,31 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.declarations
 
 import org.jetbrains.kotlin.ir.symbols.IrPropertySymbol
 import org.jetbrains.kotlin.ir.symbols.IrSimpleFunctionSymbol
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitor
 
-abstract class IrSimpleFunction :
+/**
-    IrFunction(),
+ * A leaf IR tree element.
-    IrOverridableDeclaration<IrSimpleFunctionSymbol>,
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.simpleFunction
-    IrAttributeContainer {
+ */
-
+abstract class IrSimpleFunction : IrFunction(),
+        IrOverridableDeclaration<IrSimpleFunctionSymbol>, IrAttributeContainer {
     abstract override val symbol: IrSimpleFunctionSymbol
 
     abstract val isTailrec: Boolean
+
     abstract val isSuspend: Boolean
+
     abstract override val isFakeOverride: Boolean
+
     abstract val isOperator: Boolean
+
     abstract val isInfix: Boolean
 
     abstract var correspondingPropertySymbol: IrPropertySymbol?

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/declarations/IrSymbolOwner.kt

@@ -1,13 +1,20 @@
 /*
- * Copyright 2010-2022 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2021 JetBrains s.r.o. and Kotlin Programming Language contributors.
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.declarations
 
 import org.jetbrains.kotlin.ir.IrElement
 import org.jetbrains.kotlin.ir.symbols.IrSymbol
 
+/**
+ * A non-leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.symbolOwner
+ */
 interface IrSymbolOwner : IrElement {
     val symbol: IrSymbol
 }

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/declarations/IrTypeAlias.kt

@@ -3,6 +3,9 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.declarations
 
 import org.jetbrains.kotlin.descriptors.TypeAliasDescriptor
@@ -13,17 +16,19 @@ import org.jetbrains.kotlin.ir.util.transformIfNeeded
 import org.jetbrains.kotlin.ir.visitors.IrElementTransformer
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitor
 
-abstract class IrTypeAlias :
+/**
-    IrDeclarationBase(),
+ * A leaf IR tree element.
-    IrDeclarationWithName,
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.typeAlias
-    IrDeclarationWithVisibility,
+ */
-    IrTypeParametersContainer {
+abstract class IrTypeAlias : IrDeclarationBase(), IrDeclarationWithName,
-
+        IrDeclarationWithVisibility, IrTypeParametersContainer {
     @ObsoleteDescriptorBasedAPI
     abstract override val descriptor: TypeAliasDescriptor
+
     abstract override val symbol: IrTypeAliasSymbol
 
     abstract val isActual: Boolean
+
     abstract var expandedType: IrType
 
     override fun <R, D> accept(visitor: IrElementVisitor<R, D>, data: D): R =

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/declarations/IrTypeParameter.kt

@@ -3,6 +3,9 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.declarations
 
 import org.jetbrains.kotlin.descriptors.TypeParameterDescriptor
@@ -13,19 +16,27 @@ import org.jetbrains.kotlin.ir.visitors.IrElementTransformer
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitor
 import org.jetbrains.kotlin.types.Variance
 
+/**
+ * A leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.typeParameter
+ */
 abstract class IrTypeParameter : IrDeclarationBase(), IrDeclarationWithName {
     @ObsoleteDescriptorBasedAPI
     abstract override val descriptor: TypeParameterDescriptor
+
     abstract override val symbol: IrTypeParameterSymbol
 
     abstract val variance: Variance
+
     abstract val index: Int
+
     abstract val isReified: Boolean
+
     abstract var superTypes: List<IrType>
 
     override fun <R, D> accept(visitor: IrElementVisitor<R, D>, data: D): R =
         visitor.visitTypeParameter(this, data)
 
-    override fun <D> transform(transformer: IrElementTransformer<D>, data: D): IrTypeParameter =
+    override fun <D> transform(transformer: IrElementTransformer<D>, data: D):
-        transformer.visitTypeParameter(this, data) as IrTypeParameter
+            IrTypeParameter = accept(transformer, data) as IrTypeParameter
 }

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/declarations/IrTypeParametersContainer.kt

@@ -3,8 +3,16 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.declarations
 
+
+/**
+ * A non-leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.typeParametersContainer
+ */
 interface IrTypeParametersContainer : IrDeclaration, IrDeclarationParent {
     var typeParameters: List<IrTypeParameter>
 }

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/declarations/IrValueDeclaration.kt

@@ -3,6 +3,9 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.declarations
 
 import org.jetbrains.kotlin.descriptors.ValueDescriptor
@@ -10,12 +13,17 @@ import org.jetbrains.kotlin.ir.ObsoleteDescriptorBasedAPI
 import org.jetbrains.kotlin.ir.symbols.IrValueSymbol
 import org.jetbrains.kotlin.ir.types.IrType
 
-abstract class IrValueDeclaration : IrDeclarationBase(), IrDeclarationWithName, IrSymbolOwner {
+/**
+ * A non-leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.valueDeclaration
+ */
+interface IrValueDeclaration : IrDeclarationWithName, IrSymbolOwner {
     @ObsoleteDescriptorBasedAPI
-    abstract override val descriptor: ValueDescriptor
+    override val descriptor: ValueDescriptor
 
-    abstract override val symbol: IrValueSymbol
+    override val symbol: IrValueSymbol
-    abstract var type: IrType
 
-    abstract val isAssignable: Boolean
+    var type: IrType
+
+    val isAssignable: Boolean
 }

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/declarations/IrValueParameter.kt

@@ -3,6 +3,9 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.declarations
 
 import org.jetbrains.kotlin.descriptors.ParameterDescriptor
@@ -13,20 +16,24 @@ import org.jetbrains.kotlin.ir.types.IrType
 import org.jetbrains.kotlin.ir.visitors.IrElementTransformer
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitor
 
-abstract class IrValueParameter : IrValueDeclaration() {
+/**
+ * A leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.valueParameter
+ */
+abstract class IrValueParameter : IrDeclarationBase(), IrValueDeclaration {
     @ObsoleteDescriptorBasedAPI
     abstract override val descriptor: ParameterDescriptor
+
     abstract override val symbol: IrValueParameterSymbol
 
     abstract val index: Int
+
     abstract var varargElementType: IrType?
+
     abstract val isCrossinline: Boolean
+
     abstract val isNoinline: Boolean
 
-    // if true parameter is not included into IdSignature.
-    // Skipping hidden params makes IrFunction be look similar to FE.
-    // NOTE: it is introduced to fix KT-40980 because more clear solution was not possible to implement.
-    // Once we are able to load any top-level declaration from klib this hack should be deprecated and removed.
     abstract val isHidden: Boolean
 
     abstract var defaultValue: IrExpressionBody?
@@ -34,8 +41,8 @@ abstract class IrValueParameter : IrValueDeclaration() {
     override fun <R, D> accept(visitor: IrElementVisitor<R, D>, data: D): R =
         visitor.visitValueParameter(this, data)
 
-    override fun <D> transform(transformer: IrElementTransformer<D>, data: D): IrValueParameter =
+    override fun <D> transform(transformer: IrElementTransformer<D>, data: D):
-        transformer.visitValueParameter(this, data) as IrValueParameter
+            IrValueParameter = accept(transformer, data) as IrValueParameter
 
     override fun <D> acceptChildren(visitor: IrElementVisitor<Unit, D>, data: D) {
         defaultValue?.accept(visitor, data)

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/declarations/IrVariable.kt

@@ -3,6 +3,9 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.declarations
 
 import org.jetbrains.kotlin.descriptors.VariableDescriptor
@@ -12,13 +15,20 @@ import org.jetbrains.kotlin.ir.symbols.IrVariableSymbol
 import org.jetbrains.kotlin.ir.visitors.IrElementTransformer
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitor
 
-abstract class IrVariable : IrValueDeclaration() {
+/**
+ * A leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.variable
+ */
+abstract class IrVariable : IrDeclarationBase(), IrValueDeclaration {
     @ObsoleteDescriptorBasedAPI
     abstract override val descriptor: VariableDescriptor
+
     abstract override val symbol: IrVariableSymbol
 
     abstract val isVar: Boolean
+
     abstract val isConst: Boolean
+
     abstract val isLateinit: Boolean
 
     abstract var initializer: IrExpression?

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/expressions/IrBlock.kt

@@ -3,10 +3,17 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.expressions
 
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitor
 
+/**
+ * A non-leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.block
+ */
 abstract class IrBlock : IrContainerExpression() {
     override val isTransparentScope: Boolean
         get() = false

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/expressions/IrBlockBody.kt

@@ -3,6 +3,9 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.expressions
 
 import org.jetbrains.kotlin.ir.declarations.IrFactory
@@ -10,6 +13,10 @@ import org.jetbrains.kotlin.ir.util.transformInPlace
 import org.jetbrains.kotlin.ir.visitors.IrElementTransformer
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitor
 
+/**
+ * A leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.blockBody
+ */
 abstract class IrBlockBody : IrBody(), IrStatementContainer {
     abstract val factory: IrFactory
 

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/expressions/IrBody.kt

@@ -3,12 +3,20 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.expressions
 
+import org.jetbrains.kotlin.ir.IrElement
 import org.jetbrains.kotlin.ir.IrElementBase
 import org.jetbrains.kotlin.ir.visitors.IrElementTransformer
 
-abstract class IrBody : IrElementBase() {
+/**
+ * A non-leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.body
+ */
+abstract class IrBody : IrElementBase(), IrElement {
     override fun <D> transform(transformer: IrElementTransformer<D>, data: D): IrBody =
         accept(transformer, data) as IrBody
 }

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/expressions/IrBranch.kt

@@ -3,27 +3,36 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.expressions
 
+import org.jetbrains.kotlin.ir.IrElement
 import org.jetbrains.kotlin.ir.IrElementBase
 import org.jetbrains.kotlin.ir.visitors.IrElementTransformer
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitor
 
-abstract class IrBranch : IrElementBase() {
+/**
+ * A non-leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.branch
+ */
+abstract class IrBranch : IrElementBase(), IrElement {
     abstract var condition: IrExpression
+
     abstract var result: IrExpression
 
     override fun <R, D> accept(visitor: IrElementVisitor<R, D>, data: D): R =
         visitor.visitBranch(this, data)
 
+    override fun <D> transform(transformer: IrElementTransformer<D>, data: D): IrBranch =
+        accept(transformer, data) as IrBranch
+
     override fun <D> acceptChildren(visitor: IrElementVisitor<Unit, D>, data: D) {
         condition.accept(visitor, data)
         result.accept(visitor, data)
     }
 
-    override fun <D> transform(transformer: IrElementTransformer<D>, data: D): IrBranch =
-        transformer.visitBranch(this, data)
-
     override fun <D> transformChildren(transformer: IrElementTransformer<D>, data: D) {
         condition = condition.transform(transformer, data)
         result = result.transform(transformer, data)

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/expressions/IrBreak.kt

@@ -3,10 +3,17 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.expressions
 
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitor
 
+/**
+ * A leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.break
+ */
 abstract class IrBreak : IrBreakContinue() {
     override fun <R, D> accept(visitor: IrElementVisitor<R, D>, data: D): R =
         visitor.visitBreak(this, data)

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/expressions/IrBreakContinue.kt

@@ -3,8 +3,16 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.expressions
 
+
+/**
+ * A non-leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.breakContinue
+ */
 abstract class IrBreakContinue : IrExpression() {
     abstract var loop: IrLoop
 

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/expressions/IrCall.kt

@@ -3,14 +3,22 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.expressions
 
 import org.jetbrains.kotlin.ir.symbols.IrClassSymbol
 import org.jetbrains.kotlin.ir.symbols.IrSimpleFunctionSymbol
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitor
 
+/**
+ * A leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.call
+ */
 abstract class IrCall : IrFunctionAccessExpression() {
     abstract override val symbol: IrSimpleFunctionSymbol
+
     abstract val superQualifierSymbol: IrClassSymbol?
 
     override fun <R, D> accept(visitor: IrElementVisitor<R, D>, data: D): R =

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/expressions/IrCallableReference.kt

@@ -3,11 +3,18 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.expressions
 
 import org.jetbrains.kotlin.ir.symbols.IrSymbol
 import org.jetbrains.kotlin.name.Name
 
+/**
+ * A non-leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.callableReference
+ */
 abstract class IrCallableReference<S : IrSymbol> : IrMemberAccessExpression<S>() {
     abstract val referencedName: Name
 }

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/expressions/IrCatch.kt

@@ -3,28 +3,37 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.expressions
 
+import org.jetbrains.kotlin.ir.IrElement
 import org.jetbrains.kotlin.ir.IrElementBase
 import org.jetbrains.kotlin.ir.declarations.IrVariable
 import org.jetbrains.kotlin.ir.visitors.IrElementTransformer
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitor
 
-abstract class IrCatch : IrElementBase() {
+/**
+ * A leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.catch
+ */
+abstract class IrCatch : IrElementBase(), IrElement {
     abstract var catchParameter: IrVariable
+
     abstract var result: IrExpression
 
     override fun <R, D> accept(visitor: IrElementVisitor<R, D>, data: D): R =
         visitor.visitCatch(this, data)
 
+    override fun <D> transform(transformer: IrElementTransformer<D>, data: D): IrCatch =
+        accept(transformer, data) as IrCatch
+
     override fun <D> acceptChildren(visitor: IrElementVisitor<Unit, D>, data: D) {
         catchParameter.accept(visitor, data)
         result.accept(visitor, data)
     }
 
-    override fun <D> transform(transformer: IrElementTransformer<D>, data: D): IrCatch =
-        super.transform(transformer, data) as IrCatch
-
     override fun <D> transformChildren(transformer: IrElementTransformer<D>, data: D) {
         catchParameter = catchParameter.transform(transformer, data) as IrVariable
         result = result.transform(transformer, data)

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/expressions/IrClassReference.kt

@@ -3,14 +3,22 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.expressions
 
 import org.jetbrains.kotlin.ir.symbols.IrClassifierSymbol
 import org.jetbrains.kotlin.ir.types.IrType
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitor
 
+/**
+ * A leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.classReference
+ */
 abstract class IrClassReference : IrDeclarationReference() {
     abstract override val symbol: IrClassifierSymbol
+
     abstract var classType: IrType
 
     override fun <R, D> accept(visitor: IrElementVisitor<R, D>, data: D): R =

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/expressions/IrComposite.kt

@@ -3,10 +3,17 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.expressions
 
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitor
 
+/**
+ * A leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.composite
+ */
 abstract class IrComposite : IrContainerExpression() {
     override val isTransparentScope: Boolean
         get() = true

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/expressions/IrConst.kt

@@ -3,12 +3,20 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.expressions
 
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitor
 
+/**
+ * A leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.const
+ */
 abstract class IrConst<T> : IrExpression() {
     abstract val kind: IrConstKind<T>
+
     abstract val value: T
 
     override fun <R, D> accept(visitor: IrElementVisitor<R, D>, data: D): R =

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/expressions/IrConstantArray.kt

@@ -3,12 +3,19 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.expressions
 
 import org.jetbrains.kotlin.ir.util.transformInPlace
 import org.jetbrains.kotlin.ir.visitors.IrElementTransformer
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitor
 
+/**
+ * A leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.constantArray
+ */
 abstract class IrConstantArray : IrConstantValue() {
     abstract val elements: MutableList<IrConstantValue>
 
@@ -16,10 +23,10 @@ abstract class IrConstantArray : IrConstantValue() {
         visitor.visitConstantArray(this, data)
 
     override fun <D> acceptChildren(visitor: IrElementVisitor<Unit, D>, data: D) {
-        elements.forEach { value -> value.accept(visitor, data) }
+        elements.forEach { it.accept(visitor, data) }
     }
 
     override fun <D> transformChildren(transformer: IrElementTransformer<D>, data: D) {
-        elements.transformInPlace { value -> value.transform(transformer, data) }
+        elements.transformInPlace(transformer, data)
     }
 }

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/expressions/IrConstantObject.kt

@@ -3,6 +3,9 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.expressions
 
 import org.jetbrains.kotlin.ir.symbols.IrConstructorSymbol
@@ -11,19 +14,25 @@ import org.jetbrains.kotlin.ir.util.transformInPlace
 import org.jetbrains.kotlin.ir.visitors.IrElementTransformer
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitor
 
+/**
+ * A leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.constantObject
+ */
 abstract class IrConstantObject : IrConstantValue() {
     abstract val constructor: IrConstructorSymbol
+
     abstract val valueArguments: MutableList<IrConstantValue>
+
     abstract val typeArguments: List<IrType>
 
     override fun <R, D> accept(visitor: IrElementVisitor<R, D>, data: D): R =
         visitor.visitConstantObject(this, data)
 
     override fun <D> acceptChildren(visitor: IrElementVisitor<Unit, D>, data: D) {
-        valueArguments.forEach { value -> value.accept(visitor, data) }
+        valueArguments.forEach { it.accept(visitor, data) }
     }
 
     override fun <D> transformChildren(transformer: IrElementTransformer<D>, data: D) {
-        valueArguments.transformInPlace { it.transform(transformer, data) }
+        valueArguments.transformInPlace(transformer, data)
     }
 }

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/expressions/IrConstantPrimitive.kt

@@ -3,11 +3,18 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.expressions
 
 import org.jetbrains.kotlin.ir.visitors.IrElementTransformer
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitor
 
+/**
+ * A leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.constantPrimitive
+ */
 abstract class IrConstantPrimitive : IrConstantValue() {
     abstract var value: IrConst<*>
 

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/expressions/IrConstantValue.kt

@@ -3,9 +3,18 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.expressions
 
+
+/**
+ * A non-leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.constantValue
+ */
 abstract class IrConstantValue : IrExpression() {
     abstract fun contentEquals(other: IrConstantValue): Boolean
+
     abstract fun contentHashCode(): Int
 }

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/expressions/IrConstructorCall.kt

@@ -3,12 +3,19 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.expressions
 
 import org.jetbrains.kotlin.descriptors.SourceElement
 import org.jetbrains.kotlin.ir.symbols.IrConstructorSymbol
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitor
 
+/**
+ * A leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.constructorCall
+ */
 abstract class IrConstructorCall : IrFunctionAccessExpression() {
     abstract override val symbol: IrConstructorSymbol
 

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/expressions/IrContainerExpression.kt

@@ -3,6 +3,9 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.expressions
 
 import org.jetbrains.kotlin.ir.IrStatement
@@ -10,8 +13,13 @@ import org.jetbrains.kotlin.ir.util.transformInPlace
 import org.jetbrains.kotlin.ir.visitors.IrElementTransformer
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitor
 
+/**
+ * A non-leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.containerExpression
+ */
 abstract class IrContainerExpression : IrExpression(), IrStatementContainer {
     abstract val origin: IrStatementOrigin?
+
     abstract val isTransparentScope: Boolean
 
     override val statements: MutableList<IrStatement> = ArrayList(2)

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/expressions/IrContinue.kt

@@ -3,10 +3,17 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.expressions
 
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitor
 
+/**
+ * A leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.continue
+ */
 abstract class IrContinue : IrBreakContinue() {
     override fun <R, D> accept(visitor: IrElementVisitor<R, D>, data: D): R =
         visitor.visitContinue(this, data)

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/expressions/IrDeclarationReference.kt

@@ -3,10 +3,17 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.expressions
 
 import org.jetbrains.kotlin.ir.symbols.IrSymbol
 
+/**
+ * A non-leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.declarationReference
+ */
 abstract class IrDeclarationReference : IrExpression() {
     abstract val symbol: IrSymbol
 }

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/expressions/IrDelegatingConstructorCall.kt

@@ -3,11 +3,18 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.expressions
 
 import org.jetbrains.kotlin.ir.symbols.IrConstructorSymbol
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitor
 
+/**
+ * A leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.delegatingConstructorCall
+ */
 abstract class IrDelegatingConstructorCall : IrFunctionAccessExpression() {
     abstract override val symbol: IrConstructorSymbol
 

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/expressions/IrDoWhileLoop.kt

@@ -3,11 +3,18 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.expressions
 
 import org.jetbrains.kotlin.ir.visitors.IrElementTransformer
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitor
 
+/**
+ * A leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.doWhileLoop
+ */
 abstract class IrDoWhileLoop : IrLoop() {
     override fun <R, D> accept(visitor: IrElementVisitor<R, D>, data: D): R =
         visitor.visitDoWhileLoop(this, data)

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/expressions/IrDynamicExpression.kt

@@ -3,6 +3,13 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.expressions
 
+/**
+ * A non-leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.dynamicExpression
+ */
 abstract class IrDynamicExpression : IrExpression()

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/expressions/IrDynamicMemberExpression.kt

@@ -3,11 +3,18 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.expressions
 
 import org.jetbrains.kotlin.ir.visitors.IrElementTransformer
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitor
 
+/**
+ * A leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.dynamicMemberExpression
+ */
 abstract class IrDynamicMemberExpression : IrDynamicExpression() {
     abstract val memberName: String
 

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/expressions/IrDynamicOperatorExpression.kt

@@ -3,11 +3,19 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.expressions
 
+import org.jetbrains.kotlin.ir.util.transformInPlace
 import org.jetbrains.kotlin.ir.visitors.IrElementTransformer
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitor
 
+/**
+ * A leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.dynamicOperatorExpression
+ */
 abstract class IrDynamicOperatorExpression : IrDynamicExpression() {
     abstract val operator: IrDynamicOperator
 
@@ -20,15 +28,11 @@ abstract class IrDynamicOperatorExpression : IrDynamicExpression() {
 
     override fun <D> acceptChildren(visitor: IrElementVisitor<Unit, D>, data: D) {
         receiver.accept(visitor, data)
-        for (valueArgument in arguments) {
+        arguments.forEach { it.accept(visitor, data) }
-            valueArgument.accept(visitor, data)
-        }
     }
 
     override fun <D> transformChildren(transformer: IrElementTransformer<D>, data: D) {
         receiver = receiver.transform(transformer, data)
-        for (i in arguments.indices) {
+        arguments.transformInPlace(transformer, data)
-            arguments[i] = arguments[i].transform(transformer, data)
-        }
     }
 }

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/expressions/IrElseBranch.kt

@@ -3,15 +3,22 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.expressions
 
 import org.jetbrains.kotlin.ir.visitors.IrElementTransformer
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitor
 
+/**
+ * A leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.elseBranch
+ */
 abstract class IrElseBranch : IrBranch() {
     override fun <R, D> accept(visitor: IrElementVisitor<R, D>, data: D): R =
         visitor.visitElseBranch(this, data)
 
-    override fun <D> transform(transformer: IrElementTransformer<D>, data: D): IrElseBranch =
+    override fun <D> transform(transformer: IrElementTransformer<D>, data: D): IrElseBranch
-        transformer.visitElseBranch(this, data)
+            = accept(transformer, data) as IrElseBranch
 }

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/expressions/IrEnumConstructorCall.kt

@@ -3,11 +3,18 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.expressions
 
 import org.jetbrains.kotlin.ir.symbols.IrConstructorSymbol
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitor
 
+/**
+ * A leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.enumConstructorCall
+ */
 abstract class IrEnumConstructorCall : IrFunctionAccessExpression() {
     abstract override val symbol: IrConstructorSymbol
 

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/expressions/IrErrorCallExpression.kt

@@ -3,13 +3,22 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.expressions
 
+import org.jetbrains.kotlin.ir.util.transformInPlace
 import org.jetbrains.kotlin.ir.visitors.IrElementTransformer
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitor
 
+/**
+ * A leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.errorCallExpression
+ */
 abstract class IrErrorCallExpression : IrErrorExpression() {
     abstract var explicitReceiver: IrExpression?
+
     abstract val arguments: MutableList<IrExpression>
 
     override fun <R, D> accept(visitor: IrElementVisitor<R, D>, data: D): R =
@@ -22,8 +31,6 @@ abstract class IrErrorCallExpression : IrErrorExpression() {
 
     override fun <D> transformChildren(transformer: IrElementTransformer<D>, data: D) {
         explicitReceiver = explicitReceiver?.transform(transformer, data)
-        arguments.forEachIndexed { i, irExpression ->
+        arguments.transformInPlace(transformer, data)
-            arguments[i] = irExpression.transform(transformer, data)
-        }
     }
 }

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/expressions/IrErrorExpression.kt

@@ -3,10 +3,17 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.expressions
 
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitor
 
+/**
+ * A non-leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.errorExpression
+ */
 abstract class IrErrorExpression : IrExpression() {
     abstract val description: String
 

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/expressions/IrExpression.kt

@@ -3,6 +3,9 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.expressions
 
 import org.jetbrains.kotlin.ir.IrElementBase
@@ -11,12 +14,16 @@ import org.jetbrains.kotlin.ir.declarations.IrAttributeContainer
 import org.jetbrains.kotlin.ir.types.IrType
 import org.jetbrains.kotlin.ir.visitors.IrElementTransformer
 
-abstract class IrExpression : IrElementBase(), IrStatement, IrVarargElement, IrAttributeContainer {
+/**
-    @Suppress("LeakingThis")
+ * A non-leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.expression
+ */
+abstract class IrExpression : IrElementBase(), IrStatement, IrVarargElement,
+        IrAttributeContainer {
     override var attributeOwnerId: IrAttributeContainer = this
 
     abstract var type: IrType
 
-    override fun <D> transform(transformer: IrElementTransformer<D>, data: D): IrExpression =
+    override fun <D> transform(transformer: IrElementTransformer<D>, data: D): IrExpression
-        accept(transformer, data) as IrExpression
+            = accept(transformer, data) as IrExpression
 }

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/expressions/IrExpressionBody.kt

@@ -3,12 +3,19 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.expressions
 
 import org.jetbrains.kotlin.ir.declarations.IrFactory
 import org.jetbrains.kotlin.ir.visitors.IrElementTransformer
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitor
 
+/**
+ * A leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.expressionBody
+ */
 abstract class IrExpressionBody : IrBody() {
     abstract val factory: IrFactory
 
@@ -17,8 +24,8 @@ abstract class IrExpressionBody : IrBody() {
     override fun <R, D> accept(visitor: IrElementVisitor<R, D>, data: D): R =
         visitor.visitExpressionBody(this, data)
 
-    override fun <D> transform(transformer: IrElementTransformer<D>, data: D): IrExpressionBody =
+    override fun <D> transform(transformer: IrElementTransformer<D>, data: D):
-        accept(transformer, data) as IrExpressionBody
+            IrExpressionBody = accept(transformer, data) as IrExpressionBody
 
     override fun <D> acceptChildren(visitor: IrElementVisitor<Unit, D>, data: D) {
         expression.accept(visitor, data)

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/expressions/IrFieldAccessExpression.kt

@@ -3,16 +3,24 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.expressions
 
 import org.jetbrains.kotlin.ir.symbols.IrClassSymbol
 import org.jetbrains.kotlin.ir.symbols.IrFieldSymbol
 
+/**
+ * A non-leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.fieldAccessExpression
+ */
 abstract class IrFieldAccessExpression : IrDeclarationReference() {
     abstract override val symbol: IrFieldSymbol
 
     abstract val superQualifierSymbol: IrClassSymbol?
 
     var receiver: IrExpression? = null
+
     abstract val origin: IrStatementOrigin?
 }

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/expressions/IrFunctionAccessExpression.kt

@@ -3,10 +3,17 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.expressions
 
 import org.jetbrains.kotlin.ir.symbols.IrFunctionSymbol
 
+/**
+ * A non-leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.functionAccessExpression
+ */
 abstract class IrFunctionAccessExpression : IrMemberAccessExpression<IrFunctionSymbol>() {
     abstract var contextReceiversCount: Int
 }

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/expressions/IrFunctionExpression.kt

@@ -3,12 +3,19 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.expressions
 
 import org.jetbrains.kotlin.ir.declarations.IrSimpleFunction
 import org.jetbrains.kotlin.ir.visitors.IrElementTransformer
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitor
 
+/**
+ * A leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.functionExpression
+ */
 abstract class IrFunctionExpression : IrExpression() {
     abstract val origin: IrStatementOrigin
 

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/expressions/IrFunctionReference.kt

@@ -3,11 +3,18 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.expressions
 
 import org.jetbrains.kotlin.ir.symbols.IrFunctionSymbol
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitor
 
+/**
+ * A leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.functionReference
+ */
 abstract class IrFunctionReference : IrCallableReference<IrFunctionSymbol>() {
     abstract val reflectionTarget: IrFunctionSymbol?
 

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/expressions/IrGetClass.kt

@@ -3,11 +3,18 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.expressions
 
 import org.jetbrains.kotlin.ir.visitors.IrElementTransformer
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitor
 
+/**
+ * A leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.getClass
+ */
 abstract class IrGetClass : IrExpression() {
     abstract var argument: IrExpression
 

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/expressions/IrGetEnumValue.kt

@@ -3,11 +3,18 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.expressions
 
 import org.jetbrains.kotlin.ir.symbols.IrEnumEntrySymbol
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitor
 
+/**
+ * A leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.getEnumValue
+ */
 abstract class IrGetEnumValue : IrGetSingletonValue() {
     abstract override val symbol: IrEnumEntrySymbol
 

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/expressions/IrGetField.kt

@@ -3,11 +3,18 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.expressions
 
 import org.jetbrains.kotlin.ir.visitors.IrElementTransformer
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitor
 
+/**
+ * A leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.getField
+ */
 abstract class IrGetField : IrFieldAccessExpression() {
     override fun <R, D> accept(visitor: IrElementVisitor<R, D>, data: D): R =
         visitor.visitGetField(this, data)

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/expressions/IrGetObjectValue.kt

@@ -3,11 +3,18 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.expressions
 
 import org.jetbrains.kotlin.ir.symbols.IrClassSymbol
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitor
 
+/**
+ * A leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.getObjectValue
+ */
 abstract class IrGetObjectValue : IrGetSingletonValue() {
     abstract override val symbol: IrClassSymbol
 

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/expressions/IrGetSingletonValue.kt

@@ -3,6 +3,13 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.expressions
 
+/**
+ * A non-leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.getSingletonValue
+ */
 abstract class IrGetSingletonValue : IrDeclarationReference()

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/expressions/IrGetValue.kt

@@ -3,10 +3,17 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.expressions
 
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitor
 
+/**
+ * A leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.getValue
+ */
 abstract class IrGetValue : IrValueAccessExpression() {
     override fun <R, D> accept(visitor: IrElementVisitor<R, D>, data: D): R =
         visitor.visitGetValue(this, data)

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/expressions/IrInstanceInitializerCall.kt

@@ -3,11 +3,18 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.expressions
 
 import org.jetbrains.kotlin.ir.symbols.IrClassSymbol
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitor
 
+/**
+ * A leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.instanceInitializerCall
+ */
 abstract class IrInstanceInitializerCall : IrExpression() {
     abstract val classSymbol: IrClassSymbol
 

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/expressions/IrLocalDelegatedPropertyReference.kt

@@ -3,6 +3,9 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.expressions
 
 import org.jetbrains.kotlin.ir.symbols.IrLocalDelegatedPropertySymbol
@@ -10,9 +13,16 @@ import org.jetbrains.kotlin.ir.symbols.IrSimpleFunctionSymbol
 import org.jetbrains.kotlin.ir.symbols.IrVariableSymbol
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitor
 
-abstract class IrLocalDelegatedPropertyReference : IrCallableReference<IrLocalDelegatedPropertySymbol>() {
+/**
+ * A leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.localDelegatedPropertyReference
+ */
+abstract class IrLocalDelegatedPropertyReference :
+        IrCallableReference<IrLocalDelegatedPropertySymbol>() {
     abstract val delegate: IrVariableSymbol
+
     abstract val getter: IrSimpleFunctionSymbol
+
     abstract val setter: IrSimpleFunctionSymbol?
 
     override fun <R, D> accept(visitor: IrElementVisitor<R, D>, data: D): R =

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/expressions/IrLoop.kt

@@ -3,12 +3,22 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.expressions
 
+
+/**
+ * A non-leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.loop
+ */
 abstract class IrLoop : IrExpression() {
     abstract val origin: IrStatementOrigin?
 
     var body: IrExpression? = null
-    lateinit var condition: IrExpression
+
+    abstract var condition: IrExpression
+
     var label: String? = null
 }

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/expressions/IrPropertyReference.kt

@@ -3,6 +3,9 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.expressions
 
 import org.jetbrains.kotlin.ir.symbols.IrFieldSymbol
@@ -10,9 +13,15 @@ import org.jetbrains.kotlin.ir.symbols.IrPropertySymbol
 import org.jetbrains.kotlin.ir.symbols.IrSimpleFunctionSymbol
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitor
 
+/**
+ * A leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.propertyReference
+ */
 abstract class IrPropertyReference : IrCallableReference<IrPropertySymbol>() {
     abstract val field: IrFieldSymbol?
+
     abstract val getter: IrSimpleFunctionSymbol?
+
     abstract val setter: IrSimpleFunctionSymbol?
 
     override fun <R, D> accept(visitor: IrElementVisitor<R, D>, data: D): R =

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/expressions/IrRawFunctionReference.kt

@@ -3,16 +3,17 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.expressions
 
 import org.jetbrains.kotlin.ir.symbols.IrFunctionSymbol
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitor
 
 /**
- * Platform-specific low-level reference to function.
+ * A leaf IR tree element.
- *
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.rawFunctionReference
- * On JS platform it represents a plain reference to JavaScript function.
- * On JVM platform it represents a MethodHandle constant.
  */
 abstract class IrRawFunctionReference : IrDeclarationReference() {
     abstract override val symbol: IrFunctionSymbol

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/expressions/IrReturn.kt

@@ -3,14 +3,22 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.expressions
 
 import org.jetbrains.kotlin.ir.symbols.IrReturnTargetSymbol
 import org.jetbrains.kotlin.ir.visitors.IrElementTransformer
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitor
 
+/**
+ * A leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.return
+ */
 abstract class IrReturn : IrExpression() {
     abstract var value: IrExpression
+
     abstract val returnTargetSymbol: IrReturnTargetSymbol
 
     override fun <R, D> accept(visitor: IrElementVisitor<R, D>, data: D): R =

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/expressions/IrReturnableBlock.kt

@@ -3,6 +3,9 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.expressions
 
 import org.jetbrains.kotlin.ir.declarations.IrReturnTarget
@@ -10,6 +13,10 @@ import org.jetbrains.kotlin.ir.declarations.IrSymbolOwner
 import org.jetbrains.kotlin.ir.symbols.IrFunctionSymbol
 import org.jetbrains.kotlin.ir.symbols.IrReturnableBlockSymbol
 
+/**
+ * A leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.returnableBlock
+ */
 abstract class IrReturnableBlock : IrBlock(), IrSymbolOwner, IrReturnTarget {
     abstract override val symbol: IrReturnableBlockSymbol
 

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/expressions/IrSetField.kt

@@ -3,11 +3,18 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.expressions
 
 import org.jetbrains.kotlin.ir.visitors.IrElementTransformer
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitor
 
+/**
+ * A leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.setField
+ */
 abstract class IrSetField : IrFieldAccessExpression() {
     abstract var value: IrExpression
 

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/expressions/IrSetValue.kt

@@ -3,14 +3,22 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.expressions
 
 import org.jetbrains.kotlin.ir.symbols.IrValueSymbol
 import org.jetbrains.kotlin.ir.visitors.IrElementTransformer
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitor
 
+/**
+ * A leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.setValue
+ */
 abstract class IrSetValue : IrValueAccessExpression() {
     abstract override val symbol: IrValueSymbol
+
     abstract var value: IrExpression
 
     override fun <R, D> accept(visitor: IrElementVisitor<R, D>, data: D): R =

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/expressions/IrSpreadElement.kt

@@ -3,21 +3,27 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.expressions
 
-import org.jetbrains.kotlin.ir.IrElement
 import org.jetbrains.kotlin.ir.IrElementBase
 import org.jetbrains.kotlin.ir.visitors.IrElementTransformer
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitor
 
+/**
+ * A leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.spreadElement
+ */
 abstract class IrSpreadElement : IrElementBase(), IrVarargElement {
     abstract var expression: IrExpression
 
     override fun <R, D> accept(visitor: IrElementVisitor<R, D>, data: D): R =
         visitor.visitSpreadElement(this, data)
 
-    override fun <D> transform(transformer: IrElementTransformer<D>, data: D): IrElement =
+    override fun <D> transform(transformer: IrElementTransformer<D>, data: D):
-        accept(transformer, data) as IrSpreadElement
+            IrSpreadElement = accept(transformer, data) as IrSpreadElement
 
     override fun <D> acceptChildren(visitor: IrElementVisitor<Unit, D>, data: D) {
         expression.accept(visitor, data)

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/expressions/IrStatementContainer.kt

@@ -3,10 +3,18 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.expressions
 
+import org.jetbrains.kotlin.ir.IrElement
 import org.jetbrains.kotlin.ir.IrStatement
 
-interface IrStatementContainer {
+/**
+ * A non-leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.statementContainer
+ */
+interface IrStatementContainer : IrElement {
     val statements: MutableList<IrStatement>
 }

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/expressions/IrStringConcatenation.kt

@@ -3,11 +3,19 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.expressions
 
+import org.jetbrains.kotlin.ir.util.transformInPlace
 import org.jetbrains.kotlin.ir.visitors.IrElementTransformer
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitor
 
+/**
+ * A leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.stringConcatenation
+ */
 abstract class IrStringConcatenation : IrExpression() {
     abstract val arguments: MutableList<IrExpression>
 
@@ -19,8 +27,6 @@ abstract class IrStringConcatenation : IrExpression() {
     }
 
     override fun <D> transformChildren(transformer: IrElementTransformer<D>, data: D) {
-        arguments.forEachIndexed { i, irExpression ->
+        arguments.transformInPlace(transformer, data)
-            arguments[i] = irExpression.transform(transformer, data)
-        }
     }
 }

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/expressions/IrSuspendableExpression.kt

@@ -3,13 +3,21 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.expressions
 
 import org.jetbrains.kotlin.ir.visitors.IrElementTransformer
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitor
 
+/**
+ * A leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.suspendableExpression
+ */
 abstract class IrSuspendableExpression : IrExpression() {
     abstract var suspensionPointId: IrExpression
+
     abstract var result: IrExpression
 
     override fun <R, D> accept(visitor: IrElementVisitor<R, D>, data: D): R =

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/expressions/IrSuspensionPoint.kt

@@ -3,15 +3,24 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.expressions
 
 import org.jetbrains.kotlin.ir.declarations.IrVariable
 import org.jetbrains.kotlin.ir.visitors.IrElementTransformer
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitor
 
+/**
+ * A leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.suspensionPoint
+ */
 abstract class IrSuspensionPoint : IrExpression() {
     abstract var suspensionPointIdParameter: IrVariable
+
     abstract var result: IrExpression
+
     abstract var resumeResult: IrExpression
 
     override fun <R, D> accept(visitor: IrElementVisitor<R, D>, data: D): R =
@@ -24,7 +33,8 @@ abstract class IrSuspensionPoint : IrExpression() {
     }
 
     override fun <D> transformChildren(transformer: IrElementTransformer<D>, data: D) {
-        suspensionPointIdParameter = suspensionPointIdParameter.transform(transformer, data) as IrVariable
+        suspensionPointIdParameter = suspensionPointIdParameter.transform(transformer, data) as
+                IrVariable
         result = result.transform(transformer, data)
         resumeResult = resumeResult.transform(transformer, data)
     }

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/expressions/IrSyntheticBody.kt

@@ -3,10 +3,17 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.expressions
 
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitor
 
+/**
+ * A leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.syntheticBody
+ */
 abstract class IrSyntheticBody : IrBody() {
     abstract val kind: IrSyntheticBodyKind
 

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/expressions/IrThrow.kt

@@ -3,11 +3,18 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.expressions
 
 import org.jetbrains.kotlin.ir.visitors.IrElementTransformer
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitor
 
+/**
+ * A leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.throw
+ */
 abstract class IrThrow : IrExpression() {
     abstract var value: IrExpression
 

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/expressions/IrTry.kt

@@ -3,11 +3,19 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
+// This file was generated automatically. See compiler/ir/ir.tree/tree-generator/ReadMe.md.
+// DO NOT MODIFY IT MANUALLY.
+
 package org.jetbrains.kotlin.ir.expressions
 
+import org.jetbrains.kotlin.ir.util.transformInPlace
 import org.jetbrains.kotlin.ir.visitors.IrElementTransformer
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitor
 
+/**
+ * A leaf IR tree element.
+ * @sample org.jetbrains.kotlin.ir.generator.IrTree.try
+ */
 abstract class IrTry : IrExpression() {
     abstract var tryResult: IrExpression
 
@@ -26,9 +34,7 @@ abstract class IrTry : IrExpression() {
 
     override fun <D> transformChildren(transformer: IrElementTransformer<D>, data: D) {
         tryResult = tryResult.transform(transformer, data)
-        catches.forEachIndexed { i, irCatch ->
+        catches.transformInPlace(transformer, data)
-            catches[i] = irCatch.transform(transformer, data)
-        }
         finallyExpression = finallyExpression?.transform(transformer, data)
     }
 }