diff --git a/compiler/fir/fir2ir/src/org/jetbrains/kotlin/fir/backend/generators/DataClassMembersGenerator.kt b/compiler/fir/fir2ir/src/org/jetbrains/kotlin/fir/backend/generators/DataClassMembersGenerator.kt
index 7e0ecbf63dd..c78bbd2d935 100644
--- a/compiler/fir/fir2ir/src/org/jetbrains/kotlin/fir/backend/generators/DataClassMembersGenerator.kt
+++ b/compiler/fir/fir2ir/src/org/jetbrains/kotlin/fir/backend/generators/DataClassMembersGenerator.kt
@@ -17,8 +17,6 @@ import org.jetbrains.kotlin.fir.declarations.impl.FirDeclarationStatusImpl
 import org.jetbrains.kotlin.fir.scopes.unsubstitutedScope
 import org.jetbrains.kotlin.fir.symbols.CallableId
 import org.jetbrains.kotlin.fir.symbols.ConeClassLikeLookupTag
-import org.jetbrains.kotlin.fir.symbols.impl.ConeClassLikeLookupTagImpl
-import org.jetbrains.kotlin.fir.symbols.impl.FirClassSymbol
 import org.jetbrains.kotlin.fir.symbols.impl.FirNamedFunctionSymbol
 import org.jetbrains.kotlin.fir.symbols.impl.FirVariableSymbol
 import org.jetbrains.kotlin.fir.types.ConeStarProjection
@@ -37,7 +35,6 @@ import org.jetbrains.kotlin.ir.expressions.IrMemberAccessExpression
 import org.jetbrains.kotlin.ir.types.IrType
 import org.jetbrains.kotlin.ir.util.*
 import org.jetbrains.kotlin.ir.util.DataClassMembersGenerator
-import org.jetbrains.kotlin.name.ClassId
 import org.jetbrains.kotlin.name.Name
 
 /**
@@ -84,11 +81,11 @@ class DataClassMembersGenerator(val components: Fir2IrComponents) {
                 // TODO
             }
 
-            override fun getBackingField(parameter: ValueParameterDescriptor?, irValueParameter: IrValueParameter?): IrField? =
+            override fun getProperty(parameter: ValueParameterDescriptor?, irValueParameter: IrValueParameter?): IrProperty? =
                 irValueParameter?.let {
                     irClass.properties.single { irProperty ->
                         irProperty.name == irValueParameter.name && irProperty.backingField?.type == irValueParameter.type
-                    }.backingField
+                    }
                 }
 
             override fun transform(typeParameterDescriptor: TypeParameterDescriptor): IrType {
@@ -216,8 +213,8 @@ class DataClassMembersGenerator(val components: Fir2IrComponents) {
         fun generateComponentBody(irFunction: IrFunction) {
             val index = getComponentIndex(irFunction)!!
             val valueParameter = irClass.primaryConstructor!!.valueParameters[index - 1]
-            val backingField = irDataClassMembersGenerator.getBackingField(null, valueParameter)!!
-            irDataClassMembersGenerator.generateComponentFunction(irFunction, backingField)
+            val irProperty = irDataClassMembersGenerator.getProperty(null, valueParameter)!!
+            irDataClassMembersGenerator.generateComponentFunction(irFunction, irProperty)
         }
 
         fun generateCopyBody(irFunction: IrFunction) =
diff --git a/compiler/fir/fir2ir/tests-gen/org/jetbrains/kotlin/codegen/ir/FirBytecodeTextTestGenerated.java b/compiler/fir/fir2ir/tests-gen/org/jetbrains/kotlin/codegen/ir/FirBytecodeTextTestGenerated.java
index 83b4453a87f..1188525c21b 100644
--- a/compiler/fir/fir2ir/tests-gen/org/jetbrains/kotlin/codegen/ir/FirBytecodeTextTestGenerated.java
+++ b/compiler/fir/fir2ir/tests-gen/org/jetbrains/kotlin/codegen/ir/FirBytecodeTextTestGenerated.java
@@ -4210,6 +4210,16 @@ public class FirBytecodeTextTestGenerated extends AbstractFirBytecodeTextTest {
             KotlinTestUtils.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("compiler/testData/codegen/bytecodeText/properties"), Pattern.compile("^(.+)\\.kt$"), null, TargetBackend.JVM_IR, true);
         }
 
+        @TestMetadata("dataClass.kt")
+        public void testDataClass() throws Exception {
+            runTest("compiler/testData/codegen/bytecodeText/properties/dataClass.kt");
+        }
+
+        @TestMetadata("openDataClass.kt")
+        public void testOpenDataClass() throws Exception {
+            runTest("compiler/testData/codegen/bytecodeText/properties/openDataClass.kt");
+        }
+
         @TestMetadata("compiler/testData/codegen/bytecodeText/properties/lateinit")
         @TestDataPath("$PROJECT_ROOT")
         @RunWith(JUnit3RunnerWithInners.class)
diff --git a/compiler/fir/fir2ir/tests-gen/org/jetbrains/kotlin/fir/Fir2IrTextTestGenerated.java b/compiler/fir/fir2ir/tests-gen/org/jetbrains/kotlin/fir/Fir2IrTextTestGenerated.java
index b5d80bfd611..7f13a2d4ae3 100644
--- a/compiler/fir/fir2ir/tests-gen/org/jetbrains/kotlin/fir/Fir2IrTextTestGenerated.java
+++ b/compiler/fir/fir2ir/tests-gen/org/jetbrains/kotlin/fir/Fir2IrTextTestGenerated.java
@@ -221,6 +221,11 @@ public class Fir2IrTextTestGenerated extends AbstractFir2IrTextTest {
             runTest("compiler/testData/ir/irText/classes/objectWithInitializers.kt");
         }
 
+        @TestMetadata("openDataClass.kt")
+        public void testOpenDataClass() throws Exception {
+            runTest("compiler/testData/ir/irText/classes/openDataClass.kt");
+        }
+
         @TestMetadata("outerClassAccess.kt")
         public void testOuterClassAccess() throws Exception {
             runTest("compiler/testData/ir/irText/classes/outerClassAccess.kt");
diff --git a/compiler/ir/ir.psi2ir/src/org/jetbrains/kotlin/psi2ir/generators/DataClassMembersGenerator.kt b/compiler/ir/ir.psi2ir/src/org/jetbrains/kotlin/psi2ir/generators/DataClassMembersGenerator.kt
index ad7079d37fd..0c9f09e84bb 100644
--- a/compiler/ir/ir.psi2ir/src/org/jetbrains/kotlin/psi2ir/generators/DataClassMembersGenerator.kt
+++ b/compiler/ir/ir.psi2ir/src/org/jetbrains/kotlin/psi2ir/generators/DataClassMembersGenerator.kt
@@ -69,10 +69,10 @@ class DataClassMembersGenerator(
                 FunctionGenerator(declarationGenerator).generateSyntheticFunctionParameterDeclarations(irFunction)
             }
 
-            override fun getBackingField(parameter: ValueParameterDescriptor?, irValueParameter: IrValueParameter?): IrField? =
+            override fun getProperty(parameter: ValueParameterDescriptor?, irValueParameter: IrValueParameter?): IrProperty? =
                 parameter?.let {
                     val property = getOrFail(BindingContext.VALUE_PARAMETER_AS_PROPERTY, parameter)
-                    return getBackingField(property)
+                    return getProperty(property)
                 }
 
             override fun transform(typeParameterDescriptor: TypeParameterDescriptor): IrType =
@@ -86,8 +86,8 @@ class DataClassMembersGenerator(
         override fun generateComponentFunction(function: FunctionDescriptor, parameter: ValueParameterDescriptor) {
             if (!irClass.isData) return
 
-            val backingField = irDataClassMembersGenerator.getBackingField(parameter, null) ?: return
-            irDataClassMembersGenerator.generateComponentFunction(function, backingField)
+            val irProperty = irDataClassMembersGenerator.getProperty(parameter, null) ?: return
+            irDataClassMembersGenerator.generateComponentFunction(function, irProperty)
         }
 
         override fun generateCopyFunction(function: FunctionDescriptor, constructorParameters: List<KtParameter>) {
diff --git a/compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/util/DataClassMembersGenerator.kt b/compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/util/DataClassMembersGenerator.kt
index 15ff8885722..dc9b19bfa01 100644
--- a/compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/util/DataClassMembersGenerator.kt
+++ b/compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/util/DataClassMembersGenerator.kt
@@ -43,6 +43,8 @@ abstract class DataClassMembersGenerator(
     val irClass: IrClass,
     val origin: IrDeclarationOrigin
 ) {
+    private val irPropertiesByDescriptor: Map<PropertyDescriptor, IrProperty> =
+        irClass.properties.associateBy { it.descriptor }
 
     inline fun <T : IrDeclaration> T.buildWithScope(builder: (T) -> Unit): T =
         also { irDeclaration ->
@@ -87,12 +89,26 @@ abstract class DataClassMembersGenerator(
             )
         }
 
+        fun irGetProperty(receiver: IrExpression, property: IrProperty): IrExpression {
+            // In some JVM-specific cases, such as when 'allopen' compiler plugin is applied,
+            // data classes and corresponding properties can be non-final.
+            // We should use getters for such properties (see KT-41284).
+            val backingField = property.backingField
+            return if (property.modality == Modality.FINAL && backingField != null) {
+                irGetField(receiver, backingField)
+            } else {
+                irCall(property.getter!!).apply {
+                    dispatchReceiver = receiver
+                }
+            }
+        }
+
         fun putDefault(parameter: ValueParameterDescriptor, value: IrExpression) {
             irFunction.putDefault(parameter, irExprBody(value))
         }
 
-        fun generateComponentFunction(irField: IrField) {
-            +irReturn(irGetField(irThis(), irField))
+        fun generateComponentFunction(irProperty: IrProperty) {
+            +irReturn(irGetProperty(irThis(), irProperty))
         }
 
         fun generateCopyFunction(constructorSymbol: IrConstructorSymbol) {
@@ -120,9 +136,9 @@ abstract class DataClassMembersGenerator(
             +irIfThenReturnFalse(irNotIs(irOther(), irType))
             val otherWithCast = irTemporary(irAs(irOther(), irType), "other_with_cast")
             for (property in properties) {
-                val field = getBackingField(property)
-                val arg1 = irGetField(irThis(), field)
-                val arg2 = irGetField(irGet(irType, otherWithCast.symbol), field)
+                val irProperty = getProperty(property)
+                val arg1 = irGetProperty(irThis(), irProperty)
+                val arg2 = irGetProperty(irGet(irType, otherWithCast.symbol), irProperty)
                 +irIfThenReturnFalse(irNotEquals(arg1, arg2))
             }
             +irReturnTrue()
@@ -176,17 +192,17 @@ abstract class DataClassMembersGenerator(
         }
 
         private fun getHashCodeOfProperty(property: PropertyDescriptor): IrExpression {
-            val field = getBackingField(property)
+            val irProperty = getProperty(property)
             return when {
                 property.type.isNullable() ->
                     irIfNull(
                         context.irBuiltIns.intType,
-                        irGetField(irThis(), field),
+                        irGetProperty(irThis(), irProperty),
                         irInt(0),
-                        getHashCodeOf(property, irGetField(irThis(), field))
+                        getHashCodeOf(property, irGetProperty(irThis(), irProperty))
                     )
                 else ->
-                    getHashCodeOf(property, irGetField(irThis(), field))
+                    getHashCodeOf(property, irGetProperty(irThis(), irProperty))
             }
         }
 
@@ -222,7 +238,7 @@ abstract class DataClassMembersGenerator(
 
                 irConcat.addArgument(irString(property.name.asString() + "="))
 
-                val irPropertyValue = irGetField(irThis(), getBackingField(property))
+                val irPropertyValue = irGetProperty(irThis(), getProperty(property))
 
                 val typeConstructorDescriptor = property.type.constructor.declarationDescriptor
                 val irPropertyStringValue =
@@ -243,8 +259,9 @@ abstract class DataClassMembersGenerator(
         }
     }
 
-    fun getBackingField(property: PropertyDescriptor): IrField =
-        irClass.properties.single { it.descriptor == property }.backingField!!
+    fun getProperty(property: PropertyDescriptor): IrProperty =
+        irPropertiesByDescriptor[property]
+            ?: throw AssertionError("Class: ${irClass.descriptor}: unexpected property descriptor: $property")
 
     abstract fun declareSimpleFunction(startOffset: Int, endOffset: Int, functionDescriptor: FunctionDescriptor): IrFunction
 
@@ -281,20 +298,20 @@ abstract class DataClassMembersGenerator(
     }
 
     // Entry for psi2ir
-    fun generateComponentFunction(function: FunctionDescriptor, irField: IrField) {
+    fun generateComponentFunction(function: FunctionDescriptor, irProperty: IrProperty) {
         buildMember(function) {
-            generateComponentFunction(irField)
+            generateComponentFunction(irProperty)
         }
     }
 
     // Entry for fir2ir
-    fun generateComponentFunction(irFunction: IrFunction, irField: IrField) {
+    fun generateComponentFunction(irFunction: IrFunction, irProperty: IrProperty) {
         buildMember(irFunction) {
-            generateComponentFunction(irField)
+            generateComponentFunction(irProperty)
         }
     }
 
-    abstract fun getBackingField(parameter: ValueParameterDescriptor?, irValueParameter: IrValueParameter?): IrField?
+    abstract fun getProperty(parameter: ValueParameterDescriptor?, irValueParameter: IrValueParameter?): IrProperty?
 
     abstract fun transform(typeParameterDescriptor: TypeParameterDescriptor): IrType
 
@@ -302,7 +319,7 @@ abstract class DataClassMembersGenerator(
     fun generateCopyFunction(function: FunctionDescriptor, constructorSymbol: IrConstructorSymbol) {
         buildMember(function) {
             function.valueParameters.forEach { parameter ->
-                putDefault(parameter, irGetField(irThis(), getBackingField(parameter, null)!!))
+                putDefault(parameter, irGetProperty(irThis(), getProperty(parameter, null)!!))
             }
             generateCopyFunction(constructorSymbol)
         }
@@ -312,7 +329,7 @@ abstract class DataClassMembersGenerator(
     fun generateCopyFunction(irFunction: IrFunction, constructorSymbol: IrConstructorSymbol) {
         buildMember(irFunction) {
             irFunction.valueParameters.forEach { irValueParameter ->
-                irValueParameter.defaultValue = irExprBody(irGetField(irThis(), getBackingField(null, irValueParameter)!!))
+                irValueParameter.defaultValue = irExprBody(irGetProperty(irThis(), getProperty(null, irValueParameter)!!))
             }
             generateCopyFunction(constructorSymbol)
         }
diff --git a/compiler/testData/codegen/bytecodeText/properties/dataClass.kt b/compiler/testData/codegen/bytecodeText/properties/dataClass.kt
new file mode 100644
index 00000000000..fcdb74310c3
--- /dev/null
+++ b/compiler/testData/codegen/bytecodeText/properties/dataClass.kt
@@ -0,0 +1,8 @@
+data class Test(
+    val x: String,
+    val y: String
+)
+
+// 7 GETFIELD Test\.x
+// 7 GETFIELD Test\.y
+// - get, componentN, copy$default, toString, hashCode, 2 times in equals
\ No newline at end of file
diff --git a/compiler/testData/codegen/bytecodeText/properties/openDataClass.kt b/compiler/testData/codegen/bytecodeText/properties/openDataClass.kt
new file mode 100644
index 00000000000..cf8a11eaacb
--- /dev/null
+++ b/compiler/testData/codegen/bytecodeText/properties/openDataClass.kt
@@ -0,0 +1,14 @@
+// This test emulates 'allopen' compiler plugin.
+
+@Suppress("INCOMPATIBLE_MODIFIERS")
+open data class Test(
+    open val x: String,
+    open val y: String
+)
+
+// 1 GETFIELD Test\.x
+// 1 GETFIELD Test\.y
+
+// 6 INVOKEVIRTUAL Test\.getX
+// 6 INVOKEVIRTUAL Test\.getY
+// - componentN, copy$default, toString, hashCode, 2 times in equals
\ No newline at end of file
diff --git a/compiler/testData/ir/irText/classes/openDataClass.fir.kt.txt b/compiler/testData/ir/irText/classes/openDataClass.fir.kt.txt
new file mode 100644
index 00000000000..0a475797811
--- /dev/null
+++ b/compiler/testData/ir/irText/classes/openDataClass.fir.kt.txt
@@ -0,0 +1,56 @@
+@Suppress(names = ["INCOMPATIBLE_MODIFIERS"])
+open data class ValidatedProperties {
+  constructor(test1: String, test2: String) /* primary */ {
+    super/*Any*/()
+    /* <init>() */
+
+  }
+
+  open val test1: String
+    field = test1
+    open get
+
+  open val test2: String
+    field = test2
+    open get
+
+  fun component1(): String {
+    return <this>.<get-test1>()
+  }
+
+  fun component2(): String {
+    return <this>.<get-test2>()
+  }
+
+  fun copy(test1: String = <this>.<get-test1>(), test2: String = <this>.<get-test2>()): ValidatedProperties {
+    return ValidatedProperties(test1 = test1, test2 = test2)
+  }
+
+  override fun equals(other: Any?): Boolean {
+    when {
+      EQEQEQ(arg0 = <this>, arg1 = other) -> return true
+    }
+    when {
+      other !is ValidatedProperties -> return false
+    }
+    val tmp0_other_with_cast: ValidatedProperties = other as ValidatedProperties
+    when {
+      EQEQ(arg0 = <this>.<get-test1>(), arg1 = tmp0_other_with_cast.<get-test1>()).not() -> return false
+    }
+    when {
+      EQEQ(arg0 = <this>.<get-test2>(), arg1 = tmp0_other_with_cast.<get-test2>()).not() -> return false
+    }
+    return true
+  }
+
+  override fun hashCode(): Int {
+    var result: Int = <this>.<get-test1>().hashCode()
+    result = result.times(other = 31).plus(other = <this>.<get-test2>().hashCode())
+    return result
+  }
+
+  override fun toString(): String {
+    return "ValidatedProperties(" + "test1=" + <this>.<get-test1>() + ", " + "test2=" + <this>.<get-test2>() + ")"
+  }
+
+}
diff --git a/compiler/testData/ir/irText/classes/openDataClass.fir.txt b/compiler/testData/ir/irText/classes/openDataClass.fir.txt
new file mode 100644
index 00000000000..445e2927336
--- /dev/null
+++ b/compiler/testData/ir/irText/classes/openDataClass.fir.txt
@@ -0,0 +1,139 @@
+FILE fqName:<root> fileName:/openDataClass.kt
+  CLASS CLASS name:ValidatedProperties modality:OPEN visibility:public [data] superTypes:[kotlin.Any]
+    annotations:
+      Suppress(names = ['INCOMPATIBLE_MODIFIERS'])
+    $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:<root>.ValidatedProperties
+    CONSTRUCTOR visibility:public <> (test1:kotlin.String, test2:kotlin.String) returnType:<root>.ValidatedProperties [primary]
+      VALUE_PARAMETER name:test1 index:0 type:kotlin.String
+      VALUE_PARAMETER name:test2 index:1 type:kotlin.String
+      BLOCK_BODY
+        DELEGATING_CONSTRUCTOR_CALL 'public constructor <init> () [primary] declared in kotlin.Any'
+        INSTANCE_INITIALIZER_CALL classDescriptor='CLASS CLASS name:ValidatedProperties modality:OPEN visibility:public [data] superTypes:[kotlin.Any]'
+    PROPERTY name:test1 visibility:public modality:OPEN [val]
+      FIELD PROPERTY_BACKING_FIELD name:test1 type:kotlin.String visibility:private [final]
+        EXPRESSION_BODY
+          GET_VAR 'test1: kotlin.String declared in <root>.ValidatedProperties.<init>' type=kotlin.String origin=INITIALIZE_PROPERTY_FROM_PARAMETER
+      FUN DEFAULT_PROPERTY_ACCESSOR name:<get-test1> visibility:public modality:OPEN <> ($this:<root>.ValidatedProperties) returnType:kotlin.String
+        correspondingProperty: PROPERTY name:test1 visibility:public modality:OPEN [val]
+        $this: VALUE_PARAMETER name:<this> type:<root>.ValidatedProperties
+        BLOCK_BODY
+          RETURN type=kotlin.Nothing from='public open fun <get-test1> (): kotlin.String declared in <root>.ValidatedProperties'
+            GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:test1 type:kotlin.String visibility:private [final]' type=kotlin.String origin=null
+              receiver: GET_VAR '<this>: <root>.ValidatedProperties declared in <root>.ValidatedProperties.<get-test1>' type=<root>.ValidatedProperties origin=null
+    PROPERTY name:test2 visibility:public modality:OPEN [val]
+      FIELD PROPERTY_BACKING_FIELD name:test2 type:kotlin.String visibility:private [final]
+        EXPRESSION_BODY
+          GET_VAR 'test2: kotlin.String declared in <root>.ValidatedProperties.<init>' type=kotlin.String origin=INITIALIZE_PROPERTY_FROM_PARAMETER
+      FUN DEFAULT_PROPERTY_ACCESSOR name:<get-test2> visibility:public modality:OPEN <> ($this:<root>.ValidatedProperties) returnType:kotlin.String
+        correspondingProperty: PROPERTY name:test2 visibility:public modality:OPEN [val]
+        $this: VALUE_PARAMETER name:<this> type:<root>.ValidatedProperties
+        BLOCK_BODY
+          RETURN type=kotlin.Nothing from='public open fun <get-test2> (): kotlin.String declared in <root>.ValidatedProperties'
+            GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:test2 type:kotlin.String visibility:private [final]' type=kotlin.String origin=null
+              receiver: GET_VAR '<this>: <root>.ValidatedProperties declared in <root>.ValidatedProperties.<get-test2>' type=<root>.ValidatedProperties origin=null
+    FUN name:component1 visibility:public modality:FINAL <> ($this:<root>.ValidatedProperties) returnType:kotlin.String
+      $this: VALUE_PARAMETER name:<this> type:<root>.ValidatedProperties
+      BLOCK_BODY
+        RETURN type=kotlin.Nothing from='public final fun component1 (): kotlin.String declared in <root>.ValidatedProperties'
+          CALL 'public open fun <get-test1> (): kotlin.String declared in <root>.ValidatedProperties' type=kotlin.String origin=null
+            $this: GET_VAR '<this>: <root>.ValidatedProperties declared in <root>.ValidatedProperties.component1' type=<root>.ValidatedProperties origin=null
+    FUN name:component2 visibility:public modality:FINAL <> ($this:<root>.ValidatedProperties) returnType:kotlin.String
+      $this: VALUE_PARAMETER name:<this> type:<root>.ValidatedProperties
+      BLOCK_BODY
+        RETURN type=kotlin.Nothing from='public final fun component2 (): kotlin.String declared in <root>.ValidatedProperties'
+          CALL 'public open fun <get-test2> (): kotlin.String declared in <root>.ValidatedProperties' type=kotlin.String origin=null
+            $this: GET_VAR '<this>: <root>.ValidatedProperties declared in <root>.ValidatedProperties.component2' type=<root>.ValidatedProperties origin=null
+    FUN name:copy visibility:public modality:FINAL <> ($this:<root>.ValidatedProperties, test1:kotlin.String, test2:kotlin.String) returnType:<root>.ValidatedProperties
+      $this: VALUE_PARAMETER name:<this> type:<root>.ValidatedProperties
+      VALUE_PARAMETER name:test1 index:0 type:kotlin.String
+        EXPRESSION_BODY
+          CALL 'public open fun <get-test1> (): kotlin.String declared in <root>.ValidatedProperties' type=kotlin.String origin=null
+            $this: GET_VAR '<this>: <root>.ValidatedProperties declared in <root>.ValidatedProperties.copy' type=<root>.ValidatedProperties origin=null
+      VALUE_PARAMETER name:test2 index:1 type:kotlin.String
+        EXPRESSION_BODY
+          CALL 'public open fun <get-test2> (): kotlin.String declared in <root>.ValidatedProperties' type=kotlin.String origin=null
+            $this: GET_VAR '<this>: <root>.ValidatedProperties declared in <root>.ValidatedProperties.copy' type=<root>.ValidatedProperties origin=null
+      BLOCK_BODY
+        RETURN type=kotlin.Nothing from='public final fun copy (test1: kotlin.String, test2: kotlin.String): <root>.ValidatedProperties declared in <root>.ValidatedProperties'
+          CONSTRUCTOR_CALL 'public constructor <init> (test1: kotlin.String, test2: kotlin.String) [primary] declared in <root>.ValidatedProperties' type=<root>.ValidatedProperties origin=null
+            test1: GET_VAR 'test1: kotlin.String declared in <root>.ValidatedProperties.copy' type=kotlin.String origin=null
+            test2: GET_VAR 'test2: kotlin.String declared in <root>.ValidatedProperties.copy' type=kotlin.String origin=null
+    FUN GENERATED_DATA_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.ValidatedProperties, other:kotlin.Any?) returnType:kotlin.Boolean
+      overridden:
+        public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in kotlin.Any
+      $this: VALUE_PARAMETER GENERATED_DATA_CLASS_MEMBER name:<this> type:<root>.ValidatedProperties
+      VALUE_PARAMETER GENERATED_DATA_CLASS_MEMBER name:other index:0 type:kotlin.Any?
+      BLOCK_BODY
+        WHEN type=kotlin.Unit origin=null
+          BRANCH
+            if: CALL 'public final fun EQEQEQ (arg0: kotlin.Any?, arg1: kotlin.Any?): kotlin.Boolean declared in kotlin.internal.ir' type=kotlin.Boolean origin=EQEQEQ
+              arg0: GET_VAR '<this>: <root>.ValidatedProperties declared in <root>.ValidatedProperties.equals' type=<root>.ValidatedProperties origin=null
+              arg1: GET_VAR 'other: kotlin.Any? declared in <root>.ValidatedProperties.equals' type=kotlin.Any? origin=null
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.ValidatedProperties'
+              CONST Boolean type=kotlin.Boolean value=true
+        WHEN type=kotlin.Unit origin=null
+          BRANCH
+            if: TYPE_OP type=kotlin.Boolean origin=NOT_INSTANCEOF typeOperand=<root>.ValidatedProperties
+              GET_VAR 'other: kotlin.Any? declared in <root>.ValidatedProperties.equals' type=kotlin.Any? origin=null
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.ValidatedProperties'
+              CONST Boolean type=kotlin.Boolean value=false
+        VAR IR_TEMPORARY_VARIABLE name:tmp_0 type:<root>.ValidatedProperties [val]
+          TYPE_OP type=<root>.ValidatedProperties origin=CAST typeOperand=<root>.ValidatedProperties
+            GET_VAR 'other: kotlin.Any? declared in <root>.ValidatedProperties.equals' type=kotlin.Any? origin=null
+        WHEN type=kotlin.Unit origin=null
+          BRANCH
+            if: CALL 'public final fun not (): kotlin.Boolean [operator] declared in kotlin.Boolean' type=kotlin.Boolean origin=EXCLEQ
+              $this: CALL 'public final fun EQEQ (arg0: kotlin.Any?, arg1: kotlin.Any?): kotlin.Boolean declared in kotlin.internal.ir' type=kotlin.Boolean origin=EXCLEQ
+                arg0: CALL 'public open fun <get-test1> (): kotlin.String declared in <root>.ValidatedProperties' type=kotlin.String origin=null
+                  $this: GET_VAR '<this>: <root>.ValidatedProperties declared in <root>.ValidatedProperties.equals' type=<root>.ValidatedProperties origin=null
+                arg1: CALL 'public open fun <get-test1> (): kotlin.String declared in <root>.ValidatedProperties' type=kotlin.String origin=null
+                  $this: GET_VAR 'val tmp_0: <root>.ValidatedProperties [val] declared in <root>.ValidatedProperties.equals' type=<root>.ValidatedProperties origin=null
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.ValidatedProperties'
+              CONST Boolean type=kotlin.Boolean value=false
+        WHEN type=kotlin.Unit origin=null
+          BRANCH
+            if: CALL 'public final fun not (): kotlin.Boolean [operator] declared in kotlin.Boolean' type=kotlin.Boolean origin=EXCLEQ
+              $this: CALL 'public final fun EQEQ (arg0: kotlin.Any?, arg1: kotlin.Any?): kotlin.Boolean declared in kotlin.internal.ir' type=kotlin.Boolean origin=EXCLEQ
+                arg0: CALL 'public open fun <get-test2> (): kotlin.String declared in <root>.ValidatedProperties' type=kotlin.String origin=null
+                  $this: GET_VAR '<this>: <root>.ValidatedProperties declared in <root>.ValidatedProperties.equals' type=<root>.ValidatedProperties origin=null
+                arg1: CALL 'public open fun <get-test2> (): kotlin.String declared in <root>.ValidatedProperties' type=kotlin.String origin=null
+                  $this: GET_VAR 'val tmp_0: <root>.ValidatedProperties [val] declared in <root>.ValidatedProperties.equals' type=<root>.ValidatedProperties origin=null
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.ValidatedProperties'
+              CONST Boolean type=kotlin.Boolean value=false
+        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.ValidatedProperties'
+          CONST Boolean type=kotlin.Boolean value=true
+    FUN GENERATED_DATA_CLASS_MEMBER name:hashCode visibility:public modality:OPEN <> ($this:<root>.ValidatedProperties) returnType:kotlin.Int
+      overridden:
+        public open fun hashCode (): kotlin.Int declared in kotlin.Any
+      $this: VALUE_PARAMETER GENERATED_DATA_CLASS_MEMBER name:<this> type:<root>.ValidatedProperties
+      BLOCK_BODY
+        VAR name:result type:kotlin.Int [var]
+          CALL 'public open fun hashCode (): kotlin.Int [fake_override] declared in kotlin.String' type=kotlin.Int origin=null
+            $this: CALL 'public open fun <get-test1> (): kotlin.String declared in <root>.ValidatedProperties' type=kotlin.String origin=null
+              $this: GET_VAR '<this>: <root>.ValidatedProperties declared in <root>.ValidatedProperties.hashCode' type=<root>.ValidatedProperties origin=null
+        SET_VAR 'var result: kotlin.Int [var] declared in <root>.ValidatedProperties.hashCode' type=kotlin.Unit origin=EQ
+          CALL 'public final fun plus (other: kotlin.Int): kotlin.Int [operator] declared in kotlin.Int' type=kotlin.Int origin=null
+            $this: CALL 'public final fun times (other: kotlin.Int): kotlin.Int [operator] declared in kotlin.Int' type=kotlin.Int origin=null
+              $this: GET_VAR 'var result: kotlin.Int [var] declared in <root>.ValidatedProperties.hashCode' type=kotlin.Int origin=null
+              other: CONST Int type=kotlin.Int value=31
+            other: CALL 'public open fun hashCode (): kotlin.Int [fake_override] declared in kotlin.String' type=kotlin.Int origin=null
+              $this: CALL 'public open fun <get-test2> (): kotlin.String declared in <root>.ValidatedProperties' type=kotlin.String origin=null
+                $this: GET_VAR '<this>: <root>.ValidatedProperties declared in <root>.ValidatedProperties.hashCode' type=<root>.ValidatedProperties origin=null
+        RETURN type=kotlin.Nothing from='public open fun hashCode (): kotlin.Int declared in <root>.ValidatedProperties'
+          GET_VAR 'var result: kotlin.Int [var] declared in <root>.ValidatedProperties.hashCode' type=kotlin.Int origin=null
+    FUN GENERATED_DATA_CLASS_MEMBER name:toString visibility:public modality:OPEN <> ($this:<root>.ValidatedProperties) returnType:kotlin.String
+      overridden:
+        public open fun toString (): kotlin.String declared in kotlin.Any
+      $this: VALUE_PARAMETER GENERATED_DATA_CLASS_MEMBER name:<this> type:<root>.ValidatedProperties
+      BLOCK_BODY
+        RETURN type=kotlin.Nothing from='public open fun toString (): kotlin.String declared in <root>.ValidatedProperties'
+          STRING_CONCATENATION type=kotlin.String
+            CONST String type=kotlin.String value="ValidatedProperties("
+            CONST String type=kotlin.String value="test1="
+            CALL 'public open fun <get-test1> (): kotlin.String declared in <root>.ValidatedProperties' type=kotlin.String origin=null
+              $this: GET_VAR '<this>: <root>.ValidatedProperties declared in <root>.ValidatedProperties.toString' type=<root>.ValidatedProperties origin=null
+            CONST String type=kotlin.String value=", "
+            CONST String type=kotlin.String value="test2="
+            CALL 'public open fun <get-test2> (): kotlin.String declared in <root>.ValidatedProperties' type=kotlin.String origin=null
+              $this: GET_VAR '<this>: <root>.ValidatedProperties declared in <root>.ValidatedProperties.toString' type=<root>.ValidatedProperties origin=null
+            CONST String type=kotlin.String value=")"
diff --git a/compiler/testData/ir/irText/classes/openDataClass.kt b/compiler/testData/ir/irText/classes/openDataClass.kt
new file mode 100644
index 00000000000..38b6584498a
--- /dev/null
+++ b/compiler/testData/ir/irText/classes/openDataClass.kt
@@ -0,0 +1,7 @@
+// This test emulates 'allopen' compiler plugin.
+
+@Suppress("INCOMPATIBLE_MODIFIERS")
+open data class ValidatedProperties(
+    open val test1: String,
+    open val test2: String
+)
\ No newline at end of file
diff --git a/compiler/testData/ir/irText/classes/openDataClass.kt.txt b/compiler/testData/ir/irText/classes/openDataClass.kt.txt
new file mode 100644
index 00000000000..048610182c2
--- /dev/null
+++ b/compiler/testData/ir/irText/classes/openDataClass.kt.txt
@@ -0,0 +1,56 @@
+@Suppress(names = ["INCOMPATIBLE_MODIFIERS"])
+open data class ValidatedProperties {
+  constructor(test1: String, test2: String) /* primary */ {
+    super/*Any*/()
+    /* <init>() */
+
+  }
+
+  open val test1: String
+    field = test1
+    open get
+
+  open val test2: String
+    field = test2
+    open get
+
+  operator fun component1(): String {
+    return <this>.<get-test1>()
+  }
+
+  operator fun component2(): String {
+    return <this>.<get-test2>()
+  }
+
+  fun copy(test1: String = <this>.<get-test1>(), test2: String = <this>.<get-test2>()): ValidatedProperties {
+    return ValidatedProperties(test1 = test1, test2 = test2)
+  }
+
+  override fun toString(): String {
+    return "ValidatedProperties(" + "test1=" + <this>.<get-test1>() + ", " + "test2=" + <this>.<get-test2>() + ")"
+  }
+
+  override fun hashCode(): Int {
+    var result: Int = <this>.<get-test1>().hashCode()
+    result = result.times(other = 31).plus(other = <this>.<get-test2>().hashCode())
+    return result
+  }
+
+  override operator fun equals(other: Any?): Boolean {
+    when {
+      EQEQEQ(arg0 = <this>, arg1 = other) -> return true
+    }
+    when {
+      other !is ValidatedProperties -> return false
+    }
+    val tmp0_other_with_cast: ValidatedProperties = other as ValidatedProperties
+    when {
+      EQEQ(arg0 = <this>.<get-test1>(), arg1 = tmp0_other_with_cast.<get-test1>()).not() -> return false
+    }
+    when {
+      EQEQ(arg0 = <this>.<get-test2>(), arg1 = tmp0_other_with_cast.<get-test2>()).not() -> return false
+    }
+    return true
+  }
+
+}
diff --git a/compiler/testData/ir/irText/classes/openDataClass.txt b/compiler/testData/ir/irText/classes/openDataClass.txt
new file mode 100644
index 00000000000..8dce07178be
--- /dev/null
+++ b/compiler/testData/ir/irText/classes/openDataClass.txt
@@ -0,0 +1,139 @@
+FILE fqName:<root> fileName:/openDataClass.kt
+  CLASS CLASS name:ValidatedProperties modality:OPEN visibility:public [data] superTypes:[kotlin.Any]
+    annotations:
+      Suppress(names = ['INCOMPATIBLE_MODIFIERS'])
+    $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:<root>.ValidatedProperties
+    CONSTRUCTOR visibility:public <> (test1:kotlin.String, test2:kotlin.String) returnType:<root>.ValidatedProperties [primary]
+      VALUE_PARAMETER name:test1 index:0 type:kotlin.String
+      VALUE_PARAMETER name:test2 index:1 type:kotlin.String
+      BLOCK_BODY
+        DELEGATING_CONSTRUCTOR_CALL 'public constructor <init> () [primary] declared in kotlin.Any'
+        INSTANCE_INITIALIZER_CALL classDescriptor='CLASS CLASS name:ValidatedProperties modality:OPEN visibility:public [data] superTypes:[kotlin.Any]'
+    PROPERTY name:test1 visibility:public modality:OPEN [val]
+      FIELD PROPERTY_BACKING_FIELD name:test1 type:kotlin.String visibility:private [final]
+        EXPRESSION_BODY
+          GET_VAR 'test1: kotlin.String declared in <root>.ValidatedProperties.<init>' type=kotlin.String origin=INITIALIZE_PROPERTY_FROM_PARAMETER
+      FUN DEFAULT_PROPERTY_ACCESSOR name:<get-test1> visibility:public modality:OPEN <> ($this:<root>.ValidatedProperties) returnType:kotlin.String
+        correspondingProperty: PROPERTY name:test1 visibility:public modality:OPEN [val]
+        $this: VALUE_PARAMETER name:<this> type:<root>.ValidatedProperties
+        BLOCK_BODY
+          RETURN type=kotlin.Nothing from='public open fun <get-test1> (): kotlin.String declared in <root>.ValidatedProperties'
+            GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:test1 type:kotlin.String visibility:private [final]' type=kotlin.String origin=null
+              receiver: GET_VAR '<this>: <root>.ValidatedProperties declared in <root>.ValidatedProperties.<get-test1>' type=<root>.ValidatedProperties origin=null
+    PROPERTY name:test2 visibility:public modality:OPEN [val]
+      FIELD PROPERTY_BACKING_FIELD name:test2 type:kotlin.String visibility:private [final]
+        EXPRESSION_BODY
+          GET_VAR 'test2: kotlin.String declared in <root>.ValidatedProperties.<init>' type=kotlin.String origin=INITIALIZE_PROPERTY_FROM_PARAMETER
+      FUN DEFAULT_PROPERTY_ACCESSOR name:<get-test2> visibility:public modality:OPEN <> ($this:<root>.ValidatedProperties) returnType:kotlin.String
+        correspondingProperty: PROPERTY name:test2 visibility:public modality:OPEN [val]
+        $this: VALUE_PARAMETER name:<this> type:<root>.ValidatedProperties
+        BLOCK_BODY
+          RETURN type=kotlin.Nothing from='public open fun <get-test2> (): kotlin.String declared in <root>.ValidatedProperties'
+            GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:test2 type:kotlin.String visibility:private [final]' type=kotlin.String origin=null
+              receiver: GET_VAR '<this>: <root>.ValidatedProperties declared in <root>.ValidatedProperties.<get-test2>' type=<root>.ValidatedProperties origin=null
+    FUN GENERATED_DATA_CLASS_MEMBER name:component1 visibility:public modality:FINAL <> ($this:<root>.ValidatedProperties) returnType:kotlin.String [operator]
+      $this: VALUE_PARAMETER name:<this> type:<root>.ValidatedProperties
+      BLOCK_BODY
+        RETURN type=kotlin.Nothing from='public final fun component1 (): kotlin.String [operator] declared in <root>.ValidatedProperties'
+          CALL 'public open fun <get-test1> (): kotlin.String declared in <root>.ValidatedProperties' type=kotlin.String origin=null
+            $this: GET_VAR '<this>: <root>.ValidatedProperties declared in <root>.ValidatedProperties.component1' type=<root>.ValidatedProperties origin=null
+    FUN GENERATED_DATA_CLASS_MEMBER name:component2 visibility:public modality:FINAL <> ($this:<root>.ValidatedProperties) returnType:kotlin.String [operator]
+      $this: VALUE_PARAMETER name:<this> type:<root>.ValidatedProperties
+      BLOCK_BODY
+        RETURN type=kotlin.Nothing from='public final fun component2 (): kotlin.String [operator] declared in <root>.ValidatedProperties'
+          CALL 'public open fun <get-test2> (): kotlin.String declared in <root>.ValidatedProperties' type=kotlin.String origin=null
+            $this: GET_VAR '<this>: <root>.ValidatedProperties declared in <root>.ValidatedProperties.component2' type=<root>.ValidatedProperties origin=null
+    FUN GENERATED_DATA_CLASS_MEMBER name:copy visibility:public modality:FINAL <> ($this:<root>.ValidatedProperties, test1:kotlin.String, test2:kotlin.String) returnType:<root>.ValidatedProperties
+      $this: VALUE_PARAMETER name:<this> type:<root>.ValidatedProperties
+      VALUE_PARAMETER name:test1 index:0 type:kotlin.String
+        EXPRESSION_BODY
+          CALL 'public open fun <get-test1> (): kotlin.String declared in <root>.ValidatedProperties' type=kotlin.String origin=null
+            $this: GET_VAR '<this>: <root>.ValidatedProperties declared in <root>.ValidatedProperties.copy' type=<root>.ValidatedProperties origin=null
+      VALUE_PARAMETER name:test2 index:1 type:kotlin.String
+        EXPRESSION_BODY
+          CALL 'public open fun <get-test2> (): kotlin.String declared in <root>.ValidatedProperties' type=kotlin.String origin=null
+            $this: GET_VAR '<this>: <root>.ValidatedProperties declared in <root>.ValidatedProperties.copy' type=<root>.ValidatedProperties origin=null
+      BLOCK_BODY
+        RETURN type=kotlin.Nothing from='public final fun copy (test1: kotlin.String, test2: kotlin.String): <root>.ValidatedProperties declared in <root>.ValidatedProperties'
+          CONSTRUCTOR_CALL 'public constructor <init> (test1: kotlin.String, test2: kotlin.String) [primary] declared in <root>.ValidatedProperties' type=<root>.ValidatedProperties origin=null
+            test1: GET_VAR 'test1: kotlin.String declared in <root>.ValidatedProperties.copy' type=kotlin.String origin=null
+            test2: GET_VAR 'test2: kotlin.String declared in <root>.ValidatedProperties.copy' type=kotlin.String origin=null
+    FUN GENERATED_DATA_CLASS_MEMBER name:toString visibility:public modality:OPEN <> ($this:<root>.ValidatedProperties) returnType:kotlin.String
+      overridden:
+        public open fun toString (): kotlin.String declared in kotlin.Any
+      $this: VALUE_PARAMETER name:<this> type:<root>.ValidatedProperties
+      BLOCK_BODY
+        RETURN type=kotlin.Nothing from='public open fun toString (): kotlin.String declared in <root>.ValidatedProperties'
+          STRING_CONCATENATION type=kotlin.String
+            CONST String type=kotlin.String value="ValidatedProperties("
+            CONST String type=kotlin.String value="test1="
+            CALL 'public open fun <get-test1> (): kotlin.String declared in <root>.ValidatedProperties' type=kotlin.String origin=null
+              $this: GET_VAR '<this>: <root>.ValidatedProperties declared in <root>.ValidatedProperties.toString' type=<root>.ValidatedProperties origin=null
+            CONST String type=kotlin.String value=", "
+            CONST String type=kotlin.String value="test2="
+            CALL 'public open fun <get-test2> (): kotlin.String declared in <root>.ValidatedProperties' type=kotlin.String origin=null
+              $this: GET_VAR '<this>: <root>.ValidatedProperties declared in <root>.ValidatedProperties.toString' type=<root>.ValidatedProperties origin=null
+            CONST String type=kotlin.String value=")"
+    FUN GENERATED_DATA_CLASS_MEMBER name:hashCode visibility:public modality:OPEN <> ($this:<root>.ValidatedProperties) returnType:kotlin.Int
+      overridden:
+        public open fun hashCode (): kotlin.Int declared in kotlin.Any
+      $this: VALUE_PARAMETER name:<this> type:<root>.ValidatedProperties
+      BLOCK_BODY
+        VAR name:result type:kotlin.Int [var]
+          CALL 'public open fun hashCode (): kotlin.Int [fake_override] declared in kotlin.String' type=kotlin.Int origin=null
+            $this: CALL 'public open fun <get-test1> (): kotlin.String declared in <root>.ValidatedProperties' type=kotlin.String origin=null
+              $this: GET_VAR '<this>: <root>.ValidatedProperties declared in <root>.ValidatedProperties.hashCode' type=<root>.ValidatedProperties origin=null
+        SET_VAR 'var result: kotlin.Int [var] declared in <root>.ValidatedProperties.hashCode' type=kotlin.Unit origin=EQ
+          CALL 'public final fun plus (other: kotlin.Int): kotlin.Int [operator] declared in kotlin.Int' type=kotlin.Int origin=null
+            $this: CALL 'public final fun times (other: kotlin.Int): kotlin.Int [operator] declared in kotlin.Int' type=kotlin.Int origin=null
+              $this: GET_VAR 'var result: kotlin.Int [var] declared in <root>.ValidatedProperties.hashCode' type=kotlin.Int origin=null
+              other: CONST Int type=kotlin.Int value=31
+            other: CALL 'public open fun hashCode (): kotlin.Int [fake_override] declared in kotlin.String' type=kotlin.Int origin=null
+              $this: CALL 'public open fun <get-test2> (): kotlin.String declared in <root>.ValidatedProperties' type=kotlin.String origin=null
+                $this: GET_VAR '<this>: <root>.ValidatedProperties declared in <root>.ValidatedProperties.hashCode' type=<root>.ValidatedProperties origin=null
+        RETURN type=kotlin.Nothing from='public open fun hashCode (): kotlin.Int declared in <root>.ValidatedProperties'
+          GET_VAR 'var result: kotlin.Int [var] declared in <root>.ValidatedProperties.hashCode' type=kotlin.Int origin=null
+    FUN GENERATED_DATA_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.ValidatedProperties, other:kotlin.Any?) returnType:kotlin.Boolean [operator]
+      overridden:
+        public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in kotlin.Any
+      $this: VALUE_PARAMETER name:<this> type:<root>.ValidatedProperties
+      VALUE_PARAMETER name:other index:0 type:kotlin.Any?
+      BLOCK_BODY
+        WHEN type=kotlin.Unit origin=null
+          BRANCH
+            if: CALL 'public final fun EQEQEQ (arg0: kotlin.Any?, arg1: kotlin.Any?): kotlin.Boolean declared in kotlin.internal.ir' type=kotlin.Boolean origin=EQEQEQ
+              arg0: GET_VAR '<this>: <root>.ValidatedProperties declared in <root>.ValidatedProperties.equals' type=<root>.ValidatedProperties origin=null
+              arg1: GET_VAR 'other: kotlin.Any? declared in <root>.ValidatedProperties.equals' type=kotlin.Any? origin=null
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.ValidatedProperties'
+              CONST Boolean type=kotlin.Boolean value=true
+        WHEN type=kotlin.Unit origin=null
+          BRANCH
+            if: TYPE_OP type=kotlin.Boolean origin=NOT_INSTANCEOF typeOperand=<root>.ValidatedProperties
+              GET_VAR 'other: kotlin.Any? declared in <root>.ValidatedProperties.equals' type=kotlin.Any? origin=null
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.ValidatedProperties'
+              CONST Boolean type=kotlin.Boolean value=false
+        VAR IR_TEMPORARY_VARIABLE name:tmp_0 type:<root>.ValidatedProperties [val]
+          TYPE_OP type=<root>.ValidatedProperties origin=CAST typeOperand=<root>.ValidatedProperties
+            GET_VAR 'other: kotlin.Any? declared in <root>.ValidatedProperties.equals' type=kotlin.Any? origin=null
+        WHEN type=kotlin.Unit origin=null
+          BRANCH
+            if: CALL 'public final fun not (): kotlin.Boolean [operator] declared in kotlin.Boolean' type=kotlin.Boolean origin=EXCLEQ
+              $this: CALL 'public final fun EQEQ (arg0: kotlin.Any?, arg1: kotlin.Any?): kotlin.Boolean declared in kotlin.internal.ir' type=kotlin.Boolean origin=EXCLEQ
+                arg0: CALL 'public open fun <get-test1> (): kotlin.String declared in <root>.ValidatedProperties' type=kotlin.String origin=null
+                  $this: GET_VAR '<this>: <root>.ValidatedProperties declared in <root>.ValidatedProperties.equals' type=<root>.ValidatedProperties origin=null
+                arg1: CALL 'public open fun <get-test1> (): kotlin.String declared in <root>.ValidatedProperties' type=kotlin.String origin=null
+                  $this: GET_VAR 'val tmp_0: <root>.ValidatedProperties [val] declared in <root>.ValidatedProperties.equals' type=<root>.ValidatedProperties origin=null
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.ValidatedProperties'
+              CONST Boolean type=kotlin.Boolean value=false
+        WHEN type=kotlin.Unit origin=null
+          BRANCH
+            if: CALL 'public final fun not (): kotlin.Boolean [operator] declared in kotlin.Boolean' type=kotlin.Boolean origin=EXCLEQ
+              $this: CALL 'public final fun EQEQ (arg0: kotlin.Any?, arg1: kotlin.Any?): kotlin.Boolean declared in kotlin.internal.ir' type=kotlin.Boolean origin=EXCLEQ
+                arg0: CALL 'public open fun <get-test2> (): kotlin.String declared in <root>.ValidatedProperties' type=kotlin.String origin=null
+                  $this: GET_VAR '<this>: <root>.ValidatedProperties declared in <root>.ValidatedProperties.equals' type=<root>.ValidatedProperties origin=null
+                arg1: CALL 'public open fun <get-test2> (): kotlin.String declared in <root>.ValidatedProperties' type=kotlin.String origin=null
+                  $this: GET_VAR 'val tmp_0: <root>.ValidatedProperties [val] declared in <root>.ValidatedProperties.equals' type=<root>.ValidatedProperties origin=null
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.ValidatedProperties'
+              CONST Boolean type=kotlin.Boolean value=false
+        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.ValidatedProperties'
+          CONST Boolean type=kotlin.Boolean value=true
diff --git a/compiler/tests-gen/org/jetbrains/kotlin/codegen/BytecodeTextTestGenerated.java b/compiler/tests-gen/org/jetbrains/kotlin/codegen/BytecodeTextTestGenerated.java
index b4e160d8211..cd167f36637 100644
--- a/compiler/tests-gen/org/jetbrains/kotlin/codegen/BytecodeTextTestGenerated.java
+++ b/compiler/tests-gen/org/jetbrains/kotlin/codegen/BytecodeTextTestGenerated.java
@@ -4282,6 +4282,16 @@ public class BytecodeTextTestGenerated extends AbstractBytecodeTextTest {
             KotlinTestUtils.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("compiler/testData/codegen/bytecodeText/properties"), Pattern.compile("^(.+)\\.kt$"), null, TargetBackend.JVM, true);
         }
 
+        @TestMetadata("dataClass.kt")
+        public void testDataClass() throws Exception {
+            runTest("compiler/testData/codegen/bytecodeText/properties/dataClass.kt");
+        }
+
+        @TestMetadata("openDataClass.kt")
+        public void testOpenDataClass() throws Exception {
+            runTest("compiler/testData/codegen/bytecodeText/properties/openDataClass.kt");
+        }
+
         @TestMetadata("compiler/testData/codegen/bytecodeText/properties/lateinit")
         @TestDataPath("$PROJECT_ROOT")
         @RunWith(JUnit3RunnerWithInners.class)
diff --git a/compiler/tests-gen/org/jetbrains/kotlin/codegen/ir/IrBytecodeTextTestGenerated.java b/compiler/tests-gen/org/jetbrains/kotlin/codegen/ir/IrBytecodeTextTestGenerated.java
index 315f7cd4837..e7e3faff259 100644
--- a/compiler/tests-gen/org/jetbrains/kotlin/codegen/ir/IrBytecodeTextTestGenerated.java
+++ b/compiler/tests-gen/org/jetbrains/kotlin/codegen/ir/IrBytecodeTextTestGenerated.java
@@ -4210,6 +4210,16 @@ public class IrBytecodeTextTestGenerated extends AbstractIrBytecodeTextTest {
             KotlinTestUtils.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("compiler/testData/codegen/bytecodeText/properties"), Pattern.compile("^(.+)\\.kt$"), null, TargetBackend.JVM_IR, true);
         }
 
+        @TestMetadata("dataClass.kt")
+        public void testDataClass() throws Exception {
+            runTest("compiler/testData/codegen/bytecodeText/properties/dataClass.kt");
+        }
+
+        @TestMetadata("openDataClass.kt")
+        public void testOpenDataClass() throws Exception {
+            runTest("compiler/testData/codegen/bytecodeText/properties/openDataClass.kt");
+        }
+
         @TestMetadata("compiler/testData/codegen/bytecodeText/properties/lateinit")
         @TestDataPath("$PROJECT_ROOT")
         @RunWith(JUnit3RunnerWithInners.class)
diff --git a/compiler/tests-gen/org/jetbrains/kotlin/ir/IrTextTestCaseGenerated.java b/compiler/tests-gen/org/jetbrains/kotlin/ir/IrTextTestCaseGenerated.java
index f16381fb6e9..5b81fdc7934 100644
--- a/compiler/tests-gen/org/jetbrains/kotlin/ir/IrTextTestCaseGenerated.java
+++ b/compiler/tests-gen/org/jetbrains/kotlin/ir/IrTextTestCaseGenerated.java
@@ -220,6 +220,11 @@ public class IrTextTestCaseGenerated extends AbstractIrTextTestCase {
             runTest("compiler/testData/ir/irText/classes/objectWithInitializers.kt");
         }
 
+        @TestMetadata("openDataClass.kt")
+        public void testOpenDataClass() throws Exception {
+            runTest("compiler/testData/ir/irText/classes/openDataClass.kt");
+        }
+
         @TestMetadata("outerClassAccess.kt")
         public void testOuterClassAccess() throws Exception {
             runTest("compiler/testData/ir/irText/classes/outerClassAccess.kt");