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 0beb54978af..6de0b518f58 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
@@ -158,7 +158,7 @@ class DataClassMembersGenerator(val components: Fir2IrComponents) : Fir2IrCompon
         fun generateDispatchReceiverParameter(irFunction: IrFunction) =
             irFunction.declareThisReceiverParameter(
                 irClass.defaultType,
-                origin,
+                IrDeclarationOrigin.DEFINED,
                 UNDEFINED_OFFSET,
                 UNDEFINED_OFFSET
             )
@@ -221,7 +221,8 @@ class DataClassMembersGenerator(val components: Fir2IrComponents) : Fir2IrCompon
                     EQUALS,
                     components.irBuiltIns.booleanType,
                     isExpect = klass.isExpect,
-                    otherParameterNeeded = true
+                    otherParameterNeeded = true,
+                    isOperator = true
                 )
                 irDataClassMembersGenerator.generateEqualsMethod(equalsFunction, properties)
                 irClass.declarations.add(equalsFunction)
@@ -271,7 +272,8 @@ class DataClassMembersGenerator(val components: Fir2IrComponents) : Fir2IrCompon
             name: Name,
             returnType: IrType,
             isExpect: Boolean,
-            otherParameterNeeded: Boolean = false
+            otherParameterNeeded: Boolean = false,
+            isOperator: Boolean = false,
         ): IrFunction {
             val functionSymbol = FirNamedFunctionSymbol(CallableId(lookupTag.classId, name))
             val firFunction = buildSimpleFunction {
@@ -309,7 +311,7 @@ class DataClassMembersGenerator(val components: Fir2IrComponents) : Fir2IrCompon
             return components.declarationStorage.declareIrSimpleFunction(signature) { symbol ->
                 components.irFactory.createFunction(
                     UNDEFINED_OFFSET, UNDEFINED_OFFSET, origin, symbol, name, DescriptorVisibilities.PUBLIC, Modality.OPEN, returnType,
-                    isInline = false, isExternal = false, isTailrec = false, isSuspend = false, isOperator = false,
+                    isInline = false, isExternal = false, isTailrec = false, isSuspend = false, isOperator = isOperator,
                     isInfix = false, isExpect = false, isFakeOverride = false,
                 ).apply {
                     if (otherParameterNeeded) {
@@ -336,7 +338,7 @@ class DataClassMembersGenerator(val components: Fir2IrComponents) : Fir2IrCompon
 
         private fun createSyntheticIrParameter(irFunction: IrFunction, name: Name, type: IrType, index: Int = 0): IrValueParameter =
             components.irFactory.createValueParameter(
-                UNDEFINED_OFFSET, UNDEFINED_OFFSET, origin, IrValueParameterSymbolImpl(), name, index, type, null,
+                UNDEFINED_OFFSET, UNDEFINED_OFFSET, IrDeclarationOrigin.DEFINED, IrValueParameterSymbolImpl(), name, index, type, null,
                 isCrossinline = false, isNoinline = false, isHidden = false, isAssignable = false
             ).apply {
                 parent = irFunction
diff --git a/compiler/testData/codegen/boxModernJdk/testsWithJava17/records/recordWithCompanion.fir.ir.txt b/compiler/testData/codegen/boxModernJdk/testsWithJava17/records/recordWithCompanion.fir.ir.txt
index 2e6e650eac0..5d8316d907e 100644
--- a/compiler/testData/codegen/boxModernJdk/testsWithJava17/records/recordWithCompanion.fir.ir.txt
+++ b/compiler/testData/codegen/boxModernJdk/testsWithJava17/records/recordWithCompanion.fir.ir.txt
@@ -54,24 +54,24 @@ FILE fqName:<root> fileName:/recordWithCompanion.kt
         RETURN type=kotlin.Nothing from='public final fun copy (id: kotlin.String): <root>.Tag declared in <root>.Tag'
           CONSTRUCTOR_CALL 'public constructor <init> (id: kotlin.String) [primary] declared in <root>.Tag' type=<root>.Tag origin=null
             id: GET_VAR 'id: kotlin.String declared in <root>.Tag.copy' type=kotlin.String origin=null
-    FUN GENERATED_DATA_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.Tag, other:kotlin.Any?) returnType:kotlin.Boolean
+    FUN GENERATED_DATA_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.Tag, 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 GENERATED_DATA_CLASS_MEMBER name:<this> type:<root>.Tag
-      VALUE_PARAMETER GENERATED_DATA_CLASS_MEMBER name:other index:0 type:kotlin.Any?
+      $this: VALUE_PARAMETER name:<this> type:<root>.Tag
+      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>.Tag declared in <root>.Tag.equals' type=<root>.Tag origin=null
               arg1: GET_VAR 'other: kotlin.Any? declared in <root>.Tag.equals' type=kotlin.Any? origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Tag'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Tag'
               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>.Tag
               GET_VAR 'other: kotlin.Any? declared in <root>.Tag.equals' type=kotlin.Any? origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Tag'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Tag'
               CONST Boolean type=kotlin.Boolean value=false
         VAR IR_TEMPORARY_VARIABLE name:tmp_0 type:<root>.Tag [val]
           TYPE_OP type=<root>.Tag origin=CAST typeOperand=<root>.Tag
@@ -84,14 +84,14 @@ FILE fqName:<root> fileName:/recordWithCompanion.kt
                   receiver: GET_VAR '<this>: <root>.Tag declared in <root>.Tag.equals' type=<root>.Tag origin=null
                 arg1: GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:id type:kotlin.String visibility:private [final]' type=kotlin.String origin=null
                   receiver: GET_VAR 'val tmp_0: <root>.Tag [val] declared in <root>.Tag.equals' type=<root>.Tag origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Tag'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Tag'
               CONST Boolean type=kotlin.Boolean value=false
-        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Tag'
+        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Tag'
           CONST Boolean type=kotlin.Boolean value=true
     FUN GENERATED_DATA_CLASS_MEMBER name:hashCode visibility:public modality:OPEN <> ($this:<root>.Tag) 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>.Tag
+      $this: VALUE_PARAMETER name:<this> type:<root>.Tag
       BLOCK_BODY
         RETURN type=kotlin.Nothing from='public open fun hashCode (): kotlin.Int declared in <root>.Tag'
           CALL 'public open fun hashCode (): kotlin.Int [fake_override] declared in kotlin.String' type=kotlin.Int origin=null
@@ -100,7 +100,7 @@ FILE fqName:<root> fileName:/recordWithCompanion.kt
     FUN GENERATED_DATA_CLASS_MEMBER name:toString visibility:public modality:OPEN <> ($this:<root>.Tag) 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>.Tag
+      $this: VALUE_PARAMETER name:<this> type:<root>.Tag
       BLOCK_BODY
         RETURN type=kotlin.Nothing from='public open fun toString (): kotlin.String declared in <root>.Tag'
           STRING_CONCATENATION type=kotlin.String
diff --git a/compiler/testData/ir/irText/classes/dataClasses/dataClassWithArrayMembers.fir.ir.txt b/compiler/testData/ir/irText/classes/dataClasses/dataClassWithArrayMembers.fir.ir.txt
index 4677adecaba..348434a3376 100644
--- a/compiler/testData/ir/irText/classes/dataClasses/dataClassWithArrayMembers.fir.ir.txt
+++ b/compiler/testData/ir/irText/classes/dataClasses/dataClassWithArrayMembers.fir.ir.txt
@@ -217,24 +217,24 @@ FILE fqName:<root> fileName:/dataClassWithArrayMembers.kt
             longArray: GET_VAR 'longArray: kotlin.LongArray declared in <root>.Test1.copy' type=kotlin.LongArray origin=null
             floatArray: GET_VAR 'floatArray: kotlin.FloatArray declared in <root>.Test1.copy' type=kotlin.FloatArray origin=null
             doubleArray: GET_VAR 'doubleArray: kotlin.DoubleArray declared in <root>.Test1.copy' type=kotlin.DoubleArray origin=null
-    FUN GENERATED_DATA_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.Test1, other:kotlin.Any?) returnType:kotlin.Boolean
+    FUN GENERATED_DATA_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.Test1, 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 GENERATED_DATA_CLASS_MEMBER name:<this> type:<root>.Test1
-      VALUE_PARAMETER GENERATED_DATA_CLASS_MEMBER name:other index:0 type:kotlin.Any?
+      $this: VALUE_PARAMETER name:<this> type:<root>.Test1
+      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>.Test1 declared in <root>.Test1.equals' type=<root>.Test1 origin=null
               arg1: GET_VAR 'other: kotlin.Any? declared in <root>.Test1.equals' type=kotlin.Any? origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Test1'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Test1'
               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>.Test1
               GET_VAR 'other: kotlin.Any? declared in <root>.Test1.equals' type=kotlin.Any? origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Test1'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Test1'
               CONST Boolean type=kotlin.Boolean value=false
         VAR IR_TEMPORARY_VARIABLE name:tmp_0 type:<root>.Test1 [val]
           TYPE_OP type=<root>.Test1 origin=CAST typeOperand=<root>.Test1
@@ -247,7 +247,7 @@ FILE fqName:<root> fileName:/dataClassWithArrayMembers.kt
                   receiver: GET_VAR '<this>: <root>.Test1 declared in <root>.Test1.equals' type=<root>.Test1 origin=null
                 arg1: GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:stringArray type:kotlin.Array<kotlin.String> visibility:private [final]' type=kotlin.Array<kotlin.String> origin=null
                   receiver: GET_VAR 'val tmp_0: <root>.Test1 [val] declared in <root>.Test1.equals' type=<root>.Test1 origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Test1'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Test1'
               CONST Boolean type=kotlin.Boolean value=false
         WHEN type=kotlin.Unit origin=null
           BRANCH
@@ -257,7 +257,7 @@ FILE fqName:<root> fileName:/dataClassWithArrayMembers.kt
                   receiver: GET_VAR '<this>: <root>.Test1 declared in <root>.Test1.equals' type=<root>.Test1 origin=null
                 arg1: GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:charArray type:kotlin.CharArray visibility:private [final]' type=kotlin.CharArray origin=null
                   receiver: GET_VAR 'val tmp_0: <root>.Test1 [val] declared in <root>.Test1.equals' type=<root>.Test1 origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Test1'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Test1'
               CONST Boolean type=kotlin.Boolean value=false
         WHEN type=kotlin.Unit origin=null
           BRANCH
@@ -267,7 +267,7 @@ FILE fqName:<root> fileName:/dataClassWithArrayMembers.kt
                   receiver: GET_VAR '<this>: <root>.Test1 declared in <root>.Test1.equals' type=<root>.Test1 origin=null
                 arg1: GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:booleanArray type:kotlin.BooleanArray visibility:private [final]' type=kotlin.BooleanArray origin=null
                   receiver: GET_VAR 'val tmp_0: <root>.Test1 [val] declared in <root>.Test1.equals' type=<root>.Test1 origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Test1'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Test1'
               CONST Boolean type=kotlin.Boolean value=false
         WHEN type=kotlin.Unit origin=null
           BRANCH
@@ -277,7 +277,7 @@ FILE fqName:<root> fileName:/dataClassWithArrayMembers.kt
                   receiver: GET_VAR '<this>: <root>.Test1 declared in <root>.Test1.equals' type=<root>.Test1 origin=null
                 arg1: GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:byteArray type:kotlin.ByteArray visibility:private [final]' type=kotlin.ByteArray origin=null
                   receiver: GET_VAR 'val tmp_0: <root>.Test1 [val] declared in <root>.Test1.equals' type=<root>.Test1 origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Test1'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Test1'
               CONST Boolean type=kotlin.Boolean value=false
         WHEN type=kotlin.Unit origin=null
           BRANCH
@@ -287,7 +287,7 @@ FILE fqName:<root> fileName:/dataClassWithArrayMembers.kt
                   receiver: GET_VAR '<this>: <root>.Test1 declared in <root>.Test1.equals' type=<root>.Test1 origin=null
                 arg1: GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:shortArray type:kotlin.ShortArray visibility:private [final]' type=kotlin.ShortArray origin=null
                   receiver: GET_VAR 'val tmp_0: <root>.Test1 [val] declared in <root>.Test1.equals' type=<root>.Test1 origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Test1'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Test1'
               CONST Boolean type=kotlin.Boolean value=false
         WHEN type=kotlin.Unit origin=null
           BRANCH
@@ -297,7 +297,7 @@ FILE fqName:<root> fileName:/dataClassWithArrayMembers.kt
                   receiver: GET_VAR '<this>: <root>.Test1 declared in <root>.Test1.equals' type=<root>.Test1 origin=null
                 arg1: GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:intArray type:kotlin.IntArray visibility:private [final]' type=kotlin.IntArray origin=null
                   receiver: GET_VAR 'val tmp_0: <root>.Test1 [val] declared in <root>.Test1.equals' type=<root>.Test1 origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Test1'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Test1'
               CONST Boolean type=kotlin.Boolean value=false
         WHEN type=kotlin.Unit origin=null
           BRANCH
@@ -307,7 +307,7 @@ FILE fqName:<root> fileName:/dataClassWithArrayMembers.kt
                   receiver: GET_VAR '<this>: <root>.Test1 declared in <root>.Test1.equals' type=<root>.Test1 origin=null
                 arg1: GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:longArray type:kotlin.LongArray visibility:private [final]' type=kotlin.LongArray origin=null
                   receiver: GET_VAR 'val tmp_0: <root>.Test1 [val] declared in <root>.Test1.equals' type=<root>.Test1 origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Test1'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Test1'
               CONST Boolean type=kotlin.Boolean value=false
         WHEN type=kotlin.Unit origin=null
           BRANCH
@@ -317,7 +317,7 @@ FILE fqName:<root> fileName:/dataClassWithArrayMembers.kt
                   receiver: GET_VAR '<this>: <root>.Test1 declared in <root>.Test1.equals' type=<root>.Test1 origin=null
                 arg1: GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:floatArray type:kotlin.FloatArray visibility:private [final]' type=kotlin.FloatArray origin=null
                   receiver: GET_VAR 'val tmp_0: <root>.Test1 [val] declared in <root>.Test1.equals' type=<root>.Test1 origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Test1'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Test1'
               CONST Boolean type=kotlin.Boolean value=false
         WHEN type=kotlin.Unit origin=null
           BRANCH
@@ -327,14 +327,14 @@ FILE fqName:<root> fileName:/dataClassWithArrayMembers.kt
                   receiver: GET_VAR '<this>: <root>.Test1 declared in <root>.Test1.equals' type=<root>.Test1 origin=null
                 arg1: GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:doubleArray type:kotlin.DoubleArray visibility:private [final]' type=kotlin.DoubleArray origin=null
                   receiver: GET_VAR 'val tmp_0: <root>.Test1 [val] declared in <root>.Test1.equals' type=<root>.Test1 origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Test1'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Test1'
               CONST Boolean type=kotlin.Boolean value=false
-        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Test1'
+        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Test1'
           CONST Boolean type=kotlin.Boolean value=true
     FUN GENERATED_DATA_CLASS_MEMBER name:hashCode visibility:public modality:OPEN <> ($this:<root>.Test1) 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>.Test1
+      $this: VALUE_PARAMETER name:<this> type:<root>.Test1
       BLOCK_BODY
         VAR name:result type:kotlin.Int [var]
           CALL 'public final fun dataClassArrayMemberHashCode (arg0: kotlin.Any): kotlin.Int declared in kotlin.internal.ir' type=kotlin.Int origin=null
@@ -409,7 +409,7 @@ FILE fqName:<root> fileName:/dataClassWithArrayMembers.kt
     FUN GENERATED_DATA_CLASS_MEMBER name:toString visibility:public modality:OPEN <> ($this:<root>.Test1) 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>.Test1
+      $this: VALUE_PARAMETER name:<this> type:<root>.Test1
       BLOCK_BODY
         RETURN type=kotlin.Nothing from='public open fun toString (): kotlin.String declared in <root>.Test1'
           STRING_CONCATENATION type=kotlin.String
@@ -486,24 +486,24 @@ FILE fqName:<root> fileName:/dataClassWithArrayMembers.kt
           CONSTRUCTOR_CALL 'public constructor <init> (genericArray: kotlin.Array<T of <root>.Test2>) [primary] declared in <root>.Test2' type=<root>.Test2<T of <root>.Test2> origin=null
             <class: T>: kotlin.Any
             genericArray: GET_VAR 'genericArray: kotlin.Array<T of <root>.Test2> declared in <root>.Test2.copy' type=kotlin.Array<T of <root>.Test2> origin=null
-    FUN GENERATED_DATA_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.Test2<T of <root>.Test2>, other:kotlin.Any?) returnType:kotlin.Boolean
+    FUN GENERATED_DATA_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.Test2<T of <root>.Test2>, 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 GENERATED_DATA_CLASS_MEMBER name:<this> type:<root>.Test2<T of <root>.Test2>
-      VALUE_PARAMETER GENERATED_DATA_CLASS_MEMBER name:other index:0 type:kotlin.Any?
+      $this: VALUE_PARAMETER name:<this> type:<root>.Test2<T of <root>.Test2>
+      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>.Test2<T of <root>.Test2> declared in <root>.Test2.equals' type=<root>.Test2<T of <root>.Test2> origin=null
               arg1: GET_VAR 'other: kotlin.Any? declared in <root>.Test2.equals' type=kotlin.Any? origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Test2'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Test2'
               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>.Test2<T of <root>.Test2>
               GET_VAR 'other: kotlin.Any? declared in <root>.Test2.equals' type=kotlin.Any? origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Test2'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Test2'
               CONST Boolean type=kotlin.Boolean value=false
         VAR IR_TEMPORARY_VARIABLE name:tmp_1 type:<root>.Test2<T of <root>.Test2> [val]
           TYPE_OP type=<root>.Test2<T of <root>.Test2> origin=CAST typeOperand=<root>.Test2<T of <root>.Test2>
@@ -516,14 +516,14 @@ FILE fqName:<root> fileName:/dataClassWithArrayMembers.kt
                   receiver: GET_VAR '<this>: <root>.Test2<T of <root>.Test2> declared in <root>.Test2.equals' type=<root>.Test2<T of <root>.Test2> origin=null
                 arg1: GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:genericArray type:kotlin.Array<T of <root>.Test2> visibility:private [final]' type=kotlin.Array<T of <root>.Test2> origin=null
                   receiver: GET_VAR 'val tmp_1: <root>.Test2<T of <root>.Test2> [val] declared in <root>.Test2.equals' type=<root>.Test2<T of <root>.Test2> origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Test2'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Test2'
               CONST Boolean type=kotlin.Boolean value=false
-        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Test2'
+        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Test2'
           CONST Boolean type=kotlin.Boolean value=true
     FUN GENERATED_DATA_CLASS_MEMBER name:hashCode visibility:public modality:OPEN <> ($this:<root>.Test2<T of <root>.Test2>) 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>.Test2<T of <root>.Test2>
+      $this: VALUE_PARAMETER name:<this> type:<root>.Test2<T of <root>.Test2>
       BLOCK_BODY
         RETURN type=kotlin.Nothing from='public open fun hashCode (): kotlin.Int declared in <root>.Test2'
           CALL 'public final fun dataClassArrayMemberHashCode (arg0: kotlin.Any): kotlin.Int declared in kotlin.internal.ir' type=kotlin.Int origin=null
@@ -532,7 +532,7 @@ FILE fqName:<root> fileName:/dataClassWithArrayMembers.kt
     FUN GENERATED_DATA_CLASS_MEMBER name:toString visibility:public modality:OPEN <> ($this:<root>.Test2<T of <root>.Test2>) 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>.Test2<T of <root>.Test2>
+      $this: VALUE_PARAMETER name:<this> type:<root>.Test2<T of <root>.Test2>
       BLOCK_BODY
         RETURN type=kotlin.Nothing from='public open fun toString (): kotlin.String declared in <root>.Test2'
           STRING_CONCATENATION type=kotlin.String
@@ -575,24 +575,24 @@ FILE fqName:<root> fileName:/dataClassWithArrayMembers.kt
         RETURN type=kotlin.Nothing from='public final fun copy (anyArrayN: kotlin.Array<kotlin.Any>?): <root>.Test3 declared in <root>.Test3'
           CONSTRUCTOR_CALL 'public constructor <init> (anyArrayN: kotlin.Array<kotlin.Any>?) [primary] declared in <root>.Test3' type=<root>.Test3 origin=null
             anyArrayN: GET_VAR 'anyArrayN: kotlin.Array<kotlin.Any>? declared in <root>.Test3.copy' type=kotlin.Array<kotlin.Any>? origin=null
-    FUN GENERATED_DATA_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.Test3, other:kotlin.Any?) returnType:kotlin.Boolean
+    FUN GENERATED_DATA_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.Test3, 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 GENERATED_DATA_CLASS_MEMBER name:<this> type:<root>.Test3
-      VALUE_PARAMETER GENERATED_DATA_CLASS_MEMBER name:other index:0 type:kotlin.Any?
+      $this: VALUE_PARAMETER name:<this> type:<root>.Test3
+      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>.Test3 declared in <root>.Test3.equals' type=<root>.Test3 origin=null
               arg1: GET_VAR 'other: kotlin.Any? declared in <root>.Test3.equals' type=kotlin.Any? origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Test3'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Test3'
               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>.Test3
               GET_VAR 'other: kotlin.Any? declared in <root>.Test3.equals' type=kotlin.Any? origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Test3'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Test3'
               CONST Boolean type=kotlin.Boolean value=false
         VAR IR_TEMPORARY_VARIABLE name:tmp_2 type:<root>.Test3 [val]
           TYPE_OP type=<root>.Test3 origin=CAST typeOperand=<root>.Test3
@@ -605,14 +605,14 @@ FILE fqName:<root> fileName:/dataClassWithArrayMembers.kt
                   receiver: GET_VAR '<this>: <root>.Test3 declared in <root>.Test3.equals' type=<root>.Test3 origin=null
                 arg1: GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:anyArrayN type:kotlin.Array<kotlin.Any>? visibility:private [final]' type=kotlin.Array<kotlin.Any>? origin=null
                   receiver: GET_VAR 'val tmp_2: <root>.Test3 [val] declared in <root>.Test3.equals' type=<root>.Test3 origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Test3'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Test3'
               CONST Boolean type=kotlin.Boolean value=false
-        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Test3'
+        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Test3'
           CONST Boolean type=kotlin.Boolean value=true
     FUN GENERATED_DATA_CLASS_MEMBER name:hashCode visibility:public modality:OPEN <> ($this:<root>.Test3) 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>.Test3
+      $this: VALUE_PARAMETER name:<this> type:<root>.Test3
       BLOCK_BODY
         RETURN type=kotlin.Nothing from='public open fun hashCode (): kotlin.Int declared in <root>.Test3'
           WHEN type=kotlin.Int origin=null
@@ -630,7 +630,7 @@ FILE fqName:<root> fileName:/dataClassWithArrayMembers.kt
     FUN GENERATED_DATA_CLASS_MEMBER name:toString visibility:public modality:OPEN <> ($this:<root>.Test3) 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>.Test3
+      $this: VALUE_PARAMETER name:<this> type:<root>.Test3
       BLOCK_BODY
         RETURN type=kotlin.Nothing from='public open fun toString (): kotlin.String declared in <root>.Test3'
           STRING_CONCATENATION type=kotlin.String
diff --git a/compiler/testData/ir/irText/classes/dataClasses/dataClassWithArrayMembers.fir.kt.txt b/compiler/testData/ir/irText/classes/dataClasses/dataClassWithArrayMembers.fir.kt.txt
index 79356de1faa..55211b2d50f 100644
--- a/compiler/testData/ir/irText/classes/dataClasses/dataClassWithArrayMembers.fir.kt.txt
+++ b/compiler/testData/ir/irText/classes/dataClasses/dataClassWithArrayMembers.fir.kt.txt
@@ -81,7 +81,7 @@ data class Test1 {
     return Test1(stringArray = stringArray, charArray = charArray, booleanArray = booleanArray, byteArray = byteArray, shortArray = shortArray, intArray = intArray, longArray = longArray, floatArray = floatArray, doubleArray = doubleArray)
   }
 
-  override fun equals(other: Any?): Boolean {
+  override operator fun equals(other: Any?): Boolean {
     when {
       EQEQEQ(arg0 = <this>, arg1 = other) -> return true
     }
@@ -157,7 +157,7 @@ data class Test2<T : Any?> {
     return Test2<Any>(genericArray = genericArray)
   }
 
-  override fun equals(other: Any?): Boolean {
+  override operator fun equals(other: Any?): Boolean {
     when {
       EQEQEQ(arg0 = <this>, arg1 = other) -> return true
     }
@@ -200,7 +200,7 @@ data class Test3 {
     return Test3(anyArrayN = anyArrayN)
   }
 
-  override fun equals(other: Any?): Boolean {
+  override operator fun equals(other: Any?): Boolean {
     when {
       EQEQEQ(arg0 = <this>, arg1 = other) -> return true
     }
diff --git a/compiler/testData/ir/irText/classes/dataClasses/dataClasses.fir.ir.txt b/compiler/testData/ir/irText/classes/dataClasses/dataClasses.fir.ir.txt
index 10a63191a11..a991355927d 100644
--- a/compiler/testData/ir/irText/classes/dataClasses/dataClasses.fir.ir.txt
+++ b/compiler/testData/ir/irText/classes/dataClasses/dataClasses.fir.ir.txt
@@ -79,24 +79,24 @@ FILE fqName:<root> fileName:/dataClasses.kt
             x: GET_VAR 'x: kotlin.Int declared in <root>.Test1.copy' type=kotlin.Int origin=null
             y: GET_VAR 'y: kotlin.String declared in <root>.Test1.copy' type=kotlin.String origin=null
             z: GET_VAR 'z: kotlin.Any declared in <root>.Test1.copy' type=kotlin.Any origin=null
-    FUN GENERATED_DATA_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.Test1, other:kotlin.Any?) returnType:kotlin.Boolean
+    FUN GENERATED_DATA_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.Test1, 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 GENERATED_DATA_CLASS_MEMBER name:<this> type:<root>.Test1
-      VALUE_PARAMETER GENERATED_DATA_CLASS_MEMBER name:other index:0 type:kotlin.Any?
+      $this: VALUE_PARAMETER name:<this> type:<root>.Test1
+      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>.Test1 declared in <root>.Test1.equals' type=<root>.Test1 origin=null
               arg1: GET_VAR 'other: kotlin.Any? declared in <root>.Test1.equals' type=kotlin.Any? origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Test1'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Test1'
               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>.Test1
               GET_VAR 'other: kotlin.Any? declared in <root>.Test1.equals' type=kotlin.Any? origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Test1'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Test1'
               CONST Boolean type=kotlin.Boolean value=false
         VAR IR_TEMPORARY_VARIABLE name:tmp_0 type:<root>.Test1 [val]
           TYPE_OP type=<root>.Test1 origin=CAST typeOperand=<root>.Test1
@@ -109,7 +109,7 @@ FILE fqName:<root> fileName:/dataClasses.kt
                   receiver: GET_VAR '<this>: <root>.Test1 declared in <root>.Test1.equals' type=<root>.Test1 origin=null
                 arg1: GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:x type:kotlin.Int visibility:private [final]' type=kotlin.Int origin=null
                   receiver: GET_VAR 'val tmp_0: <root>.Test1 [val] declared in <root>.Test1.equals' type=<root>.Test1 origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Test1'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Test1'
               CONST Boolean type=kotlin.Boolean value=false
         WHEN type=kotlin.Unit origin=null
           BRANCH
@@ -119,7 +119,7 @@ FILE fqName:<root> fileName:/dataClasses.kt
                   receiver: GET_VAR '<this>: <root>.Test1 declared in <root>.Test1.equals' type=<root>.Test1 origin=null
                 arg1: GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:y type:kotlin.String visibility:private [final]' type=kotlin.String origin=null
                   receiver: GET_VAR 'val tmp_0: <root>.Test1 [val] declared in <root>.Test1.equals' type=<root>.Test1 origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Test1'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Test1'
               CONST Boolean type=kotlin.Boolean value=false
         WHEN type=kotlin.Unit origin=null
           BRANCH
@@ -129,14 +129,14 @@ FILE fqName:<root> fileName:/dataClasses.kt
                   receiver: GET_VAR '<this>: <root>.Test1 declared in <root>.Test1.equals' type=<root>.Test1 origin=null
                 arg1: GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:z type:kotlin.Any visibility:private [final]' type=kotlin.Any origin=null
                   receiver: GET_VAR 'val tmp_0: <root>.Test1 [val] declared in <root>.Test1.equals' type=<root>.Test1 origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Test1'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Test1'
               CONST Boolean type=kotlin.Boolean value=false
-        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Test1'
+        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Test1'
           CONST Boolean type=kotlin.Boolean value=true
     FUN GENERATED_DATA_CLASS_MEMBER name:hashCode visibility:public modality:OPEN <> ($this:<root>.Test1) 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>.Test1
+      $this: VALUE_PARAMETER name:<this> type:<root>.Test1
       BLOCK_BODY
         VAR name:result type:kotlin.Int [var]
           CALL 'public open fun hashCode (): kotlin.Int [fake_override] declared in kotlin.Int' type=kotlin.Int origin=null
@@ -163,7 +163,7 @@ FILE fqName:<root> fileName:/dataClasses.kt
     FUN GENERATED_DATA_CLASS_MEMBER name:toString visibility:public modality:OPEN <> ($this:<root>.Test1) 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>.Test1
+      $this: VALUE_PARAMETER name:<this> type:<root>.Test1
       BLOCK_BODY
         RETURN type=kotlin.Nothing from='public open fun toString (): kotlin.String declared in <root>.Test1'
           STRING_CONCATENATION type=kotlin.String
@@ -211,24 +211,24 @@ FILE fqName:<root> fileName:/dataClasses.kt
         RETURN type=kotlin.Nothing from='public final fun copy (x: kotlin.Any?): <root>.Test2 declared in <root>.Test2'
           CONSTRUCTOR_CALL 'public constructor <init> (x: kotlin.Any?) [primary] declared in <root>.Test2' type=<root>.Test2 origin=null
             x: GET_VAR 'x: kotlin.Any? declared in <root>.Test2.copy' type=kotlin.Any? origin=null
-    FUN GENERATED_DATA_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.Test2, other:kotlin.Any?) returnType:kotlin.Boolean
+    FUN GENERATED_DATA_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.Test2, 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 GENERATED_DATA_CLASS_MEMBER name:<this> type:<root>.Test2
-      VALUE_PARAMETER GENERATED_DATA_CLASS_MEMBER name:other index:0 type:kotlin.Any?
+      $this: VALUE_PARAMETER name:<this> type:<root>.Test2
+      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>.Test2 declared in <root>.Test2.equals' type=<root>.Test2 origin=null
               arg1: GET_VAR 'other: kotlin.Any? declared in <root>.Test2.equals' type=kotlin.Any? origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Test2'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Test2'
               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>.Test2
               GET_VAR 'other: kotlin.Any? declared in <root>.Test2.equals' type=kotlin.Any? origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Test2'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Test2'
               CONST Boolean type=kotlin.Boolean value=false
         VAR IR_TEMPORARY_VARIABLE name:tmp_1 type:<root>.Test2 [val]
           TYPE_OP type=<root>.Test2 origin=CAST typeOperand=<root>.Test2
@@ -241,14 +241,14 @@ FILE fqName:<root> fileName:/dataClasses.kt
                   receiver: GET_VAR '<this>: <root>.Test2 declared in <root>.Test2.equals' type=<root>.Test2 origin=null
                 arg1: GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:x type:kotlin.Any? visibility:private [final]' type=kotlin.Any? origin=null
                   receiver: GET_VAR 'val tmp_1: <root>.Test2 [val] declared in <root>.Test2.equals' type=<root>.Test2 origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Test2'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Test2'
               CONST Boolean type=kotlin.Boolean value=false
-        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Test2'
+        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Test2'
           CONST Boolean type=kotlin.Boolean value=true
     FUN GENERATED_DATA_CLASS_MEMBER name:hashCode visibility:public modality:OPEN <> ($this:<root>.Test2) 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>.Test2
+      $this: VALUE_PARAMETER name:<this> type:<root>.Test2
       BLOCK_BODY
         RETURN type=kotlin.Nothing from='public open fun hashCode (): kotlin.Int declared in <root>.Test2'
           WHEN type=kotlin.Int origin=null
@@ -266,7 +266,7 @@ FILE fqName:<root> fileName:/dataClasses.kt
     FUN GENERATED_DATA_CLASS_MEMBER name:toString visibility:public modality:OPEN <> ($this:<root>.Test2) 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>.Test2
+      $this: VALUE_PARAMETER name:<this> type:<root>.Test2
       BLOCK_BODY
         RETURN type=kotlin.Nothing from='public open fun toString (): kotlin.String declared in <root>.Test2'
           STRING_CONCATENATION type=kotlin.String
@@ -377,24 +377,24 @@ FILE fqName:<root> fileName:/dataClasses.kt
             dn: GET_VAR 'dn: kotlin.Double? declared in <root>.Test3.copy' type=kotlin.Double? origin=null
             f: GET_VAR 'f: kotlin.Float declared in <root>.Test3.copy' type=kotlin.Float origin=null
             df: GET_VAR 'df: kotlin.Float? declared in <root>.Test3.copy' type=kotlin.Float? origin=null
-    FUN GENERATED_DATA_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.Test3, other:kotlin.Any?) returnType:kotlin.Boolean
+    FUN GENERATED_DATA_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.Test3, 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 GENERATED_DATA_CLASS_MEMBER name:<this> type:<root>.Test3
-      VALUE_PARAMETER GENERATED_DATA_CLASS_MEMBER name:other index:0 type:kotlin.Any?
+      $this: VALUE_PARAMETER name:<this> type:<root>.Test3
+      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>.Test3 declared in <root>.Test3.equals' type=<root>.Test3 origin=null
               arg1: GET_VAR 'other: kotlin.Any? declared in <root>.Test3.equals' type=kotlin.Any? origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Test3'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Test3'
               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>.Test3
               GET_VAR 'other: kotlin.Any? declared in <root>.Test3.equals' type=kotlin.Any? origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Test3'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Test3'
               CONST Boolean type=kotlin.Boolean value=false
         VAR IR_TEMPORARY_VARIABLE name:tmp_2 type:<root>.Test3 [val]
           TYPE_OP type=<root>.Test3 origin=CAST typeOperand=<root>.Test3
@@ -407,7 +407,7 @@ FILE fqName:<root> fileName:/dataClasses.kt
                   receiver: GET_VAR '<this>: <root>.Test3 declared in <root>.Test3.equals' type=<root>.Test3 origin=null
                 arg1: GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:d type:kotlin.Double visibility:private [final]' type=kotlin.Double origin=null
                   receiver: GET_VAR 'val tmp_2: <root>.Test3 [val] declared in <root>.Test3.equals' type=<root>.Test3 origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Test3'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Test3'
               CONST Boolean type=kotlin.Boolean value=false
         WHEN type=kotlin.Unit origin=null
           BRANCH
@@ -417,7 +417,7 @@ FILE fqName:<root> fileName:/dataClasses.kt
                   receiver: GET_VAR '<this>: <root>.Test3 declared in <root>.Test3.equals' type=<root>.Test3 origin=null
                 arg1: GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:dn type:kotlin.Double? visibility:private [final]' type=kotlin.Double? origin=null
                   receiver: GET_VAR 'val tmp_2: <root>.Test3 [val] declared in <root>.Test3.equals' type=<root>.Test3 origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Test3'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Test3'
               CONST Boolean type=kotlin.Boolean value=false
         WHEN type=kotlin.Unit origin=null
           BRANCH
@@ -427,7 +427,7 @@ FILE fqName:<root> fileName:/dataClasses.kt
                   receiver: GET_VAR '<this>: <root>.Test3 declared in <root>.Test3.equals' type=<root>.Test3 origin=null
                 arg1: GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:f type:kotlin.Float visibility:private [final]' type=kotlin.Float origin=null
                   receiver: GET_VAR 'val tmp_2: <root>.Test3 [val] declared in <root>.Test3.equals' type=<root>.Test3 origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Test3'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Test3'
               CONST Boolean type=kotlin.Boolean value=false
         WHEN type=kotlin.Unit origin=null
           BRANCH
@@ -437,14 +437,14 @@ FILE fqName:<root> fileName:/dataClasses.kt
                   receiver: GET_VAR '<this>: <root>.Test3 declared in <root>.Test3.equals' type=<root>.Test3 origin=null
                 arg1: GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:df type:kotlin.Float? visibility:private [final]' type=kotlin.Float? origin=null
                   receiver: GET_VAR 'val tmp_2: <root>.Test3 [val] declared in <root>.Test3.equals' type=<root>.Test3 origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Test3'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Test3'
               CONST Boolean type=kotlin.Boolean value=false
-        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Test3'
+        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Test3'
           CONST Boolean type=kotlin.Boolean value=true
     FUN GENERATED_DATA_CLASS_MEMBER name:hashCode visibility:public modality:OPEN <> ($this:<root>.Test3) 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>.Test3
+      $this: VALUE_PARAMETER name:<this> type:<root>.Test3
       BLOCK_BODY
         VAR name:result type:kotlin.Int [var]
           CALL 'public open fun hashCode (): kotlin.Int [fake_override] declared in kotlin.Double' type=kotlin.Int origin=null
@@ -497,7 +497,7 @@ FILE fqName:<root> fileName:/dataClasses.kt
     FUN GENERATED_DATA_CLASS_MEMBER name:toString visibility:public modality:OPEN <> ($this:<root>.Test3) 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>.Test3
+      $this: VALUE_PARAMETER name:<this> type:<root>.Test3
       BLOCK_BODY
         RETURN type=kotlin.Nothing from='public open fun toString (): kotlin.String declared in <root>.Test3'
           STRING_CONCATENATION type=kotlin.String
diff --git a/compiler/testData/ir/irText/classes/dataClasses/dataClasses.fir.kt.txt b/compiler/testData/ir/irText/classes/dataClasses/dataClasses.fir.kt.txt
index 860e0c95bec..d6e0f2693d9 100644
--- a/compiler/testData/ir/irText/classes/dataClasses/dataClasses.fir.kt.txt
+++ b/compiler/testData/ir/irText/classes/dataClasses/dataClasses.fir.kt.txt
@@ -33,7 +33,7 @@ data class Test1 {
     return Test1(x = x, y = y, z = z)
   }
 
-  override fun equals(other: Any?): Boolean {
+  override operator fun equals(other: Any?): Boolean {
     when {
       EQEQEQ(arg0 = <this>, arg1 = other) -> return true
     }
@@ -85,7 +85,7 @@ data class Test2 {
     return Test2(x = x)
   }
 
-  override fun equals(other: Any?): Boolean {
+  override operator fun equals(other: Any?): Boolean {
     when {
       EQEQEQ(arg0 = <this>, arg1 = other) -> return true
     }
@@ -155,7 +155,7 @@ data class Test3 {
     return Test3(d = d, dn = dn, f = f, df = df)
   }
 
-  override fun equals(other: Any?): Boolean {
+  override operator fun equals(other: Any?): Boolean {
     when {
       EQEQEQ(arg0 = <this>, arg1 = other) -> return true
     }
diff --git a/compiler/testData/ir/irText/classes/dataClasses/dataClassesGeneric.fir.ir.txt b/compiler/testData/ir/irText/classes/dataClasses/dataClassesGeneric.fir.ir.txt
index 3a0a1cb7226..c040e814234 100644
--- a/compiler/testData/ir/irText/classes/dataClasses/dataClassesGeneric.fir.ir.txt
+++ b/compiler/testData/ir/irText/classes/dataClasses/dataClassesGeneric.fir.ir.txt
@@ -35,24 +35,24 @@ FILE fqName:<root> fileName:/dataClassesGeneric.kt
           CONSTRUCTOR_CALL 'public constructor <init> (x: T of <root>.Test1) [primary] declared in <root>.Test1' type=<root>.Test1<T of <root>.Test1> origin=null
             <class: T>: kotlin.Any
             x: GET_VAR 'x: T of <root>.Test1 declared in <root>.Test1.copy' type=T of <root>.Test1 origin=null
-    FUN GENERATED_DATA_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.Test1<T of <root>.Test1>, other:kotlin.Any?) returnType:kotlin.Boolean
+    FUN GENERATED_DATA_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.Test1<T of <root>.Test1>, 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 GENERATED_DATA_CLASS_MEMBER name:<this> type:<root>.Test1<T of <root>.Test1>
-      VALUE_PARAMETER GENERATED_DATA_CLASS_MEMBER name:other index:0 type:kotlin.Any?
+      $this: VALUE_PARAMETER name:<this> type:<root>.Test1<T of <root>.Test1>
+      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>.Test1<T of <root>.Test1> declared in <root>.Test1.equals' type=<root>.Test1<T of <root>.Test1> origin=null
               arg1: GET_VAR 'other: kotlin.Any? declared in <root>.Test1.equals' type=kotlin.Any? origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Test1'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Test1'
               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>.Test1<T of <root>.Test1>
               GET_VAR 'other: kotlin.Any? declared in <root>.Test1.equals' type=kotlin.Any? origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Test1'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Test1'
               CONST Boolean type=kotlin.Boolean value=false
         VAR IR_TEMPORARY_VARIABLE name:tmp_0 type:<root>.Test1<T of <root>.Test1> [val]
           TYPE_OP type=<root>.Test1<T of <root>.Test1> origin=CAST typeOperand=<root>.Test1<T of <root>.Test1>
@@ -65,14 +65,14 @@ FILE fqName:<root> fileName:/dataClassesGeneric.kt
                   receiver: GET_VAR '<this>: <root>.Test1<T of <root>.Test1> declared in <root>.Test1.equals' type=<root>.Test1<T of <root>.Test1> origin=null
                 arg1: GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:x type:T of <root>.Test1 visibility:private [final]' type=T of <root>.Test1 origin=null
                   receiver: GET_VAR 'val tmp_0: <root>.Test1<T of <root>.Test1> [val] declared in <root>.Test1.equals' type=<root>.Test1<T of <root>.Test1> origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Test1'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Test1'
               CONST Boolean type=kotlin.Boolean value=false
-        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Test1'
+        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Test1'
           CONST Boolean type=kotlin.Boolean value=true
     FUN GENERATED_DATA_CLASS_MEMBER name:hashCode visibility:public modality:OPEN <> ($this:<root>.Test1<T of <root>.Test1>) 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>.Test1<T of <root>.Test1>
+      $this: VALUE_PARAMETER name:<this> type:<root>.Test1<T of <root>.Test1>
       BLOCK_BODY
         RETURN type=kotlin.Nothing from='public open fun hashCode (): kotlin.Int declared in <root>.Test1'
           WHEN type=kotlin.Int origin=null
@@ -90,7 +90,7 @@ FILE fqName:<root> fileName:/dataClassesGeneric.kt
     FUN GENERATED_DATA_CLASS_MEMBER name:toString visibility:public modality:OPEN <> ($this:<root>.Test1<T of <root>.Test1>) 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>.Test1<T of <root>.Test1>
+      $this: VALUE_PARAMETER name:<this> type:<root>.Test1<T of <root>.Test1>
       BLOCK_BODY
         RETURN type=kotlin.Nothing from='public open fun toString (): kotlin.String declared in <root>.Test1'
           STRING_CONCATENATION type=kotlin.String
@@ -134,24 +134,24 @@ FILE fqName:<root> fileName:/dataClassesGeneric.kt
           CONSTRUCTOR_CALL 'public constructor <init> (x: T of <root>.Test2) [primary] declared in <root>.Test2' type=<root>.Test2<T of <root>.Test2> origin=null
             <class: T>: kotlin.Any
             x: GET_VAR 'x: T of <root>.Test2 declared in <root>.Test2.copy' type=T of <root>.Test2 origin=null
-    FUN GENERATED_DATA_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.Test2<T of <root>.Test2>, other:kotlin.Any?) returnType:kotlin.Boolean
+    FUN GENERATED_DATA_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.Test2<T of <root>.Test2>, 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 GENERATED_DATA_CLASS_MEMBER name:<this> type:<root>.Test2<T of <root>.Test2>
-      VALUE_PARAMETER GENERATED_DATA_CLASS_MEMBER name:other index:0 type:kotlin.Any?
+      $this: VALUE_PARAMETER name:<this> type:<root>.Test2<T of <root>.Test2>
+      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>.Test2<T of <root>.Test2> declared in <root>.Test2.equals' type=<root>.Test2<T of <root>.Test2> origin=null
               arg1: GET_VAR 'other: kotlin.Any? declared in <root>.Test2.equals' type=kotlin.Any? origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Test2'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Test2'
               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>.Test2<T of <root>.Test2>
               GET_VAR 'other: kotlin.Any? declared in <root>.Test2.equals' type=kotlin.Any? origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Test2'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Test2'
               CONST Boolean type=kotlin.Boolean value=false
         VAR IR_TEMPORARY_VARIABLE name:tmp_1 type:<root>.Test2<T of <root>.Test2> [val]
           TYPE_OP type=<root>.Test2<T of <root>.Test2> origin=CAST typeOperand=<root>.Test2<T of <root>.Test2>
@@ -164,14 +164,14 @@ FILE fqName:<root> fileName:/dataClassesGeneric.kt
                   receiver: GET_VAR '<this>: <root>.Test2<T of <root>.Test2> declared in <root>.Test2.equals' type=<root>.Test2<T of <root>.Test2> origin=null
                 arg1: GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:x type:T of <root>.Test2 visibility:private [final]' type=T of <root>.Test2 origin=null
                   receiver: GET_VAR 'val tmp_1: <root>.Test2<T of <root>.Test2> [val] declared in <root>.Test2.equals' type=<root>.Test2<T of <root>.Test2> origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Test2'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Test2'
               CONST Boolean type=kotlin.Boolean value=false
-        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Test2'
+        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Test2'
           CONST Boolean type=kotlin.Boolean value=true
     FUN GENERATED_DATA_CLASS_MEMBER name:hashCode visibility:public modality:OPEN <> ($this:<root>.Test2<T of <root>.Test2>) 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>.Test2<T of <root>.Test2>
+      $this: VALUE_PARAMETER name:<this> type:<root>.Test2<T of <root>.Test2>
       BLOCK_BODY
         RETURN type=kotlin.Nothing from='public open fun hashCode (): kotlin.Int declared in <root>.Test2'
           CALL 'public open fun hashCode (): kotlin.Int [fake_override] declared in kotlin.Number' type=kotlin.Int origin=null
@@ -180,7 +180,7 @@ FILE fqName:<root> fileName:/dataClassesGeneric.kt
     FUN GENERATED_DATA_CLASS_MEMBER name:toString visibility:public modality:OPEN <> ($this:<root>.Test2<T of <root>.Test2>) 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>.Test2<T of <root>.Test2>
+      $this: VALUE_PARAMETER name:<this> type:<root>.Test2<T of <root>.Test2>
       BLOCK_BODY
         RETURN type=kotlin.Nothing from='public open fun toString (): kotlin.String declared in <root>.Test2'
           STRING_CONCATENATION type=kotlin.String
@@ -224,24 +224,24 @@ FILE fqName:<root> fileName:/dataClassesGeneric.kt
           CONSTRUCTOR_CALL 'public constructor <init> (x: kotlin.collections.List<T of <root>.Test3>) [primary] declared in <root>.Test3' type=<root>.Test3<T of <root>.Test3> origin=null
             <class: T>: kotlin.Any
             x: GET_VAR 'x: kotlin.collections.List<T of <root>.Test3> declared in <root>.Test3.copy' type=kotlin.collections.List<T of <root>.Test3> origin=null
-    FUN GENERATED_DATA_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.Test3<T of <root>.Test3>, other:kotlin.Any?) returnType:kotlin.Boolean
+    FUN GENERATED_DATA_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.Test3<T of <root>.Test3>, 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 GENERATED_DATA_CLASS_MEMBER name:<this> type:<root>.Test3<T of <root>.Test3>
-      VALUE_PARAMETER GENERATED_DATA_CLASS_MEMBER name:other index:0 type:kotlin.Any?
+      $this: VALUE_PARAMETER name:<this> type:<root>.Test3<T of <root>.Test3>
+      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>.Test3<T of <root>.Test3> declared in <root>.Test3.equals' type=<root>.Test3<T of <root>.Test3> origin=null
               arg1: GET_VAR 'other: kotlin.Any? declared in <root>.Test3.equals' type=kotlin.Any? origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Test3'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Test3'
               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>.Test3<T of <root>.Test3>
               GET_VAR 'other: kotlin.Any? declared in <root>.Test3.equals' type=kotlin.Any? origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Test3'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Test3'
               CONST Boolean type=kotlin.Boolean value=false
         VAR IR_TEMPORARY_VARIABLE name:tmp_2 type:<root>.Test3<T of <root>.Test3> [val]
           TYPE_OP type=<root>.Test3<T of <root>.Test3> origin=CAST typeOperand=<root>.Test3<T of <root>.Test3>
@@ -254,14 +254,14 @@ FILE fqName:<root> fileName:/dataClassesGeneric.kt
                   receiver: GET_VAR '<this>: <root>.Test3<T of <root>.Test3> declared in <root>.Test3.equals' type=<root>.Test3<T of <root>.Test3> origin=null
                 arg1: GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:x type:kotlin.collections.List<T of <root>.Test3> visibility:private [final]' type=kotlin.collections.List<T of <root>.Test3> origin=null
                   receiver: GET_VAR 'val tmp_2: <root>.Test3<T of <root>.Test3> [val] declared in <root>.Test3.equals' type=<root>.Test3<T of <root>.Test3> origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Test3'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Test3'
               CONST Boolean type=kotlin.Boolean value=false
-        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Test3'
+        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Test3'
           CONST Boolean type=kotlin.Boolean value=true
     FUN GENERATED_DATA_CLASS_MEMBER name:hashCode visibility:public modality:OPEN <> ($this:<root>.Test3<T of <root>.Test3>) 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>.Test3<T of <root>.Test3>
+      $this: VALUE_PARAMETER name:<this> type:<root>.Test3<T of <root>.Test3>
       BLOCK_BODY
         RETURN type=kotlin.Nothing from='public open fun hashCode (): kotlin.Int declared in <root>.Test3'
           CALL 'public open fun hashCode (): kotlin.Int [fake_override] declared in kotlin.collections.List' type=kotlin.Int origin=null
@@ -270,7 +270,7 @@ FILE fqName:<root> fileName:/dataClassesGeneric.kt
     FUN GENERATED_DATA_CLASS_MEMBER name:toString visibility:public modality:OPEN <> ($this:<root>.Test3<T of <root>.Test3>) 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>.Test3<T of <root>.Test3>
+      $this: VALUE_PARAMETER name:<this> type:<root>.Test3<T of <root>.Test3>
       BLOCK_BODY
         RETURN type=kotlin.Nothing from='public open fun toString (): kotlin.String declared in <root>.Test3'
           STRING_CONCATENATION type=kotlin.String
@@ -312,24 +312,24 @@ FILE fqName:<root> fileName:/dataClassesGeneric.kt
         RETURN type=kotlin.Nothing from='public final fun copy (x: kotlin.collections.List<kotlin.String>): <root>.Test4 declared in <root>.Test4'
           CONSTRUCTOR_CALL 'public constructor <init> (x: kotlin.collections.List<kotlin.String>) [primary] declared in <root>.Test4' type=<root>.Test4 origin=null
             x: GET_VAR 'x: kotlin.collections.List<kotlin.String> declared in <root>.Test4.copy' type=kotlin.collections.List<kotlin.String> origin=null
-    FUN GENERATED_DATA_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.Test4, other:kotlin.Any?) returnType:kotlin.Boolean
+    FUN GENERATED_DATA_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.Test4, 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 GENERATED_DATA_CLASS_MEMBER name:<this> type:<root>.Test4
-      VALUE_PARAMETER GENERATED_DATA_CLASS_MEMBER name:other index:0 type:kotlin.Any?
+      $this: VALUE_PARAMETER name:<this> type:<root>.Test4
+      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>.Test4 declared in <root>.Test4.equals' type=<root>.Test4 origin=null
               arg1: GET_VAR 'other: kotlin.Any? declared in <root>.Test4.equals' type=kotlin.Any? origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Test4'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Test4'
               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>.Test4
               GET_VAR 'other: kotlin.Any? declared in <root>.Test4.equals' type=kotlin.Any? origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Test4'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Test4'
               CONST Boolean type=kotlin.Boolean value=false
         VAR IR_TEMPORARY_VARIABLE name:tmp_3 type:<root>.Test4 [val]
           TYPE_OP type=<root>.Test4 origin=CAST typeOperand=<root>.Test4
@@ -342,14 +342,14 @@ FILE fqName:<root> fileName:/dataClassesGeneric.kt
                   receiver: GET_VAR '<this>: <root>.Test4 declared in <root>.Test4.equals' type=<root>.Test4 origin=null
                 arg1: GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:x type:kotlin.collections.List<kotlin.String> visibility:private [final]' type=kotlin.collections.List<kotlin.String> origin=null
                   receiver: GET_VAR 'val tmp_3: <root>.Test4 [val] declared in <root>.Test4.equals' type=<root>.Test4 origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Test4'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Test4'
               CONST Boolean type=kotlin.Boolean value=false
-        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Test4'
+        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Test4'
           CONST Boolean type=kotlin.Boolean value=true
     FUN GENERATED_DATA_CLASS_MEMBER name:hashCode visibility:public modality:OPEN <> ($this:<root>.Test4) 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>.Test4
+      $this: VALUE_PARAMETER name:<this> type:<root>.Test4
       BLOCK_BODY
         RETURN type=kotlin.Nothing from='public open fun hashCode (): kotlin.Int declared in <root>.Test4'
           CALL 'public open fun hashCode (): kotlin.Int [fake_override] declared in kotlin.collections.List' type=kotlin.Int origin=null
@@ -358,7 +358,7 @@ FILE fqName:<root> fileName:/dataClassesGeneric.kt
     FUN GENERATED_DATA_CLASS_MEMBER name:toString visibility:public modality:OPEN <> ($this:<root>.Test4) 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>.Test4
+      $this: VALUE_PARAMETER name:<this> type:<root>.Test4
       BLOCK_BODY
         RETURN type=kotlin.Nothing from='public open fun toString (): kotlin.String declared in <root>.Test4'
           STRING_CONCATENATION type=kotlin.String
diff --git a/compiler/testData/ir/irText/classes/dataClasses/dataClassesGeneric.fir.kt.txt b/compiler/testData/ir/irText/classes/dataClasses/dataClassesGeneric.fir.kt.txt
index fe75bd56ed3..5b713f124b2 100644
--- a/compiler/testData/ir/irText/classes/dataClasses/dataClassesGeneric.fir.kt.txt
+++ b/compiler/testData/ir/irText/classes/dataClasses/dataClassesGeneric.fir.kt.txt
@@ -17,7 +17,7 @@ data class Test1<T : Any?> {
     return Test1<Any>(x = x)
   }
 
-  override fun equals(other: Any?): Boolean {
+  override operator fun equals(other: Any?): Boolean {
     when {
       EQEQEQ(arg0 = <this>, arg1 = other) -> return true
     }
@@ -63,7 +63,7 @@ data class Test2<T : Number> {
     return Test2<Any>(x = x)
   }
 
-  override fun equals(other: Any?): Boolean {
+  override operator fun equals(other: Any?): Boolean {
     when {
       EQEQEQ(arg0 = <this>, arg1 = other) -> return true
     }
@@ -106,7 +106,7 @@ data class Test3<T : Any?> {
     return Test3<Any>(x = x)
   }
 
-  override fun equals(other: Any?): Boolean {
+  override operator fun equals(other: Any?): Boolean {
     when {
       EQEQEQ(arg0 = <this>, arg1 = other) -> return true
     }
@@ -149,7 +149,7 @@ data class Test4 {
     return Test4(x = x)
   }
 
-  override fun equals(other: Any?): Boolean {
+  override operator fun equals(other: Any?): Boolean {
     when {
       EQEQEQ(arg0 = <this>, arg1 = other) -> return true
     }
diff --git a/compiler/testData/ir/irText/classes/dataClasses/delegationInSealed.fir.ir.txt b/compiler/testData/ir/irText/classes/dataClasses/delegationInSealed.fir.ir.txt
index 1ec6faad811..dfad395c3b6 100644
--- a/compiler/testData/ir/irText/classes/dataClasses/delegationInSealed.fir.ir.txt
+++ b/compiler/testData/ir/irText/classes/dataClasses/delegationInSealed.fir.ir.txt
@@ -82,24 +82,24 @@ FILE fqName:<root> fileName:/delegationInSealed.kt
           RETURN type=kotlin.Nothing from='public final fun copy (c: kotlin.CharSequence): <root>.A.B declared in <root>.A.B'
             CONSTRUCTOR_CALL 'public constructor <init> (c: kotlin.CharSequence) [primary] declared in <root>.A.B' type=<root>.A.B origin=null
               c: GET_VAR 'c: kotlin.CharSequence declared in <root>.A.B.copy' type=kotlin.CharSequence origin=null
-      FUN GENERATED_DATA_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.A.B, other:kotlin.Any?) returnType:kotlin.Boolean
+      FUN GENERATED_DATA_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.A.B, 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 GENERATED_DATA_CLASS_MEMBER name:<this> type:<root>.A.B
-        VALUE_PARAMETER GENERATED_DATA_CLASS_MEMBER name:other index:0 type:kotlin.Any?
+        $this: VALUE_PARAMETER name:<this> type:<root>.A.B
+        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>.A.B declared in <root>.A.B.equals' type=<root>.A.B origin=null
                 arg1: GET_VAR 'other: kotlin.Any? declared in <root>.A.B.equals' type=kotlin.Any? origin=null
-              then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.A.B'
+              then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.A.B'
                 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>.A.B
                 GET_VAR 'other: kotlin.Any? declared in <root>.A.B.equals' type=kotlin.Any? origin=null
-              then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.A.B'
+              then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.A.B'
                 CONST Boolean type=kotlin.Boolean value=false
           VAR IR_TEMPORARY_VARIABLE name:tmp_0 type:<root>.A.B [val]
             TYPE_OP type=<root>.A.B origin=CAST typeOperand=<root>.A.B
@@ -112,14 +112,14 @@ FILE fqName:<root> fileName:/delegationInSealed.kt
                     receiver: GET_VAR '<this>: <root>.A.B declared in <root>.A.B.equals' type=<root>.A.B origin=null
                   arg1: GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:c type:kotlin.CharSequence visibility:private [final]' type=kotlin.CharSequence origin=null
                     receiver: GET_VAR 'val tmp_0: <root>.A.B [val] declared in <root>.A.B.equals' type=<root>.A.B origin=null
-              then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.A.B'
+              then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.A.B'
                 CONST Boolean type=kotlin.Boolean value=false
-          RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.A.B'
+          RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.A.B'
             CONST Boolean type=kotlin.Boolean value=true
       FUN GENERATED_DATA_CLASS_MEMBER name:hashCode visibility:public modality:OPEN <> ($this:<root>.A.B) 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>.A.B
+        $this: VALUE_PARAMETER name:<this> type:<root>.A.B
         BLOCK_BODY
           RETURN type=kotlin.Nothing from='public open fun hashCode (): kotlin.Int declared in <root>.A.B'
             CALL 'public open fun hashCode (): kotlin.Int [fake_override] declared in kotlin.CharSequence' type=kotlin.Int origin=null
@@ -128,7 +128,7 @@ FILE fqName:<root> fileName:/delegationInSealed.kt
       FUN GENERATED_DATA_CLASS_MEMBER name:toString visibility:public modality:OPEN <> ($this:<root>.A.B) 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>.A.B
+        $this: VALUE_PARAMETER name:<this> type:<root>.A.B
         BLOCK_BODY
           RETURN type=kotlin.Nothing from='public open fun toString (): kotlin.String declared in <root>.A.B'
             STRING_CONCATENATION type=kotlin.String
diff --git a/compiler/testData/ir/irText/classes/dataClasses/delegationInSealed.fir.kt.txt b/compiler/testData/ir/irText/classes/dataClasses/delegationInSealed.fir.kt.txt
index 47a66a6ca1c..810452d5955 100644
--- a/compiler/testData/ir/irText/classes/dataClasses/delegationInSealed.fir.kt.txt
+++ b/compiler/testData/ir/irText/classes/dataClasses/delegationInSealed.fir.kt.txt
@@ -37,7 +37,7 @@ sealed class A : CharSequence {
       return B(c = c)
     }
 
-    override fun equals(other: Any?): Boolean {
+    override operator fun equals(other: Any?): Boolean {
       when {
         EQEQEQ(arg0 = <this>, arg1 = other) -> return true
       }
diff --git a/compiler/testData/ir/irText/classes/dataClasses/kt31649.fir.ir.txt b/compiler/testData/ir/irText/classes/dataClasses/kt31649.fir.ir.txt
index d0eb2880d54..4fa89f4dad8 100644
--- a/compiler/testData/ir/irText/classes/dataClasses/kt31649.fir.ir.txt
+++ b/compiler/testData/ir/irText/classes/dataClasses/kt31649.fir.ir.txt
@@ -33,24 +33,24 @@ FILE fqName:<root> fileName:/kt31649.kt
         RETURN type=kotlin.Nothing from='public final fun copy (nn: kotlin.Nothing?): <root>.TestData declared in <root>.TestData'
           CONSTRUCTOR_CALL 'public constructor <init> (nn: kotlin.Nothing?) [primary] declared in <root>.TestData' type=<root>.TestData origin=null
             nn: GET_VAR 'nn: kotlin.Nothing? declared in <root>.TestData.copy' type=kotlin.Nothing? origin=null
-    FUN GENERATED_DATA_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.TestData, other:kotlin.Any?) returnType:kotlin.Boolean
+    FUN GENERATED_DATA_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.TestData, 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 GENERATED_DATA_CLASS_MEMBER name:<this> type:<root>.TestData
-      VALUE_PARAMETER GENERATED_DATA_CLASS_MEMBER name:other index:0 type:kotlin.Any?
+      $this: VALUE_PARAMETER name:<this> type:<root>.TestData
+      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>.TestData declared in <root>.TestData.equals' type=<root>.TestData origin=null
               arg1: GET_VAR 'other: kotlin.Any? declared in <root>.TestData.equals' type=kotlin.Any? origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.TestData'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.TestData'
               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>.TestData
               GET_VAR 'other: kotlin.Any? declared in <root>.TestData.equals' type=kotlin.Any? origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.TestData'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.TestData'
               CONST Boolean type=kotlin.Boolean value=false
         VAR IR_TEMPORARY_VARIABLE name:tmp_0 type:<root>.TestData [val]
           TYPE_OP type=<root>.TestData origin=CAST typeOperand=<root>.TestData
@@ -63,14 +63,14 @@ FILE fqName:<root> fileName:/kt31649.kt
                   receiver: GET_VAR '<this>: <root>.TestData declared in <root>.TestData.equals' type=<root>.TestData origin=null
                 arg1: GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:nn type:kotlin.Nothing? visibility:private [final]' type=kotlin.Nothing? origin=null
                   receiver: GET_VAR 'val tmp_0: <root>.TestData [val] declared in <root>.TestData.equals' type=<root>.TestData origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.TestData'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.TestData'
               CONST Boolean type=kotlin.Boolean value=false
-        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.TestData'
+        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.TestData'
           CONST Boolean type=kotlin.Boolean value=true
     FUN GENERATED_DATA_CLASS_MEMBER name:hashCode visibility:public modality:OPEN <> ($this:<root>.TestData) 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>.TestData
+      $this: VALUE_PARAMETER name:<this> type:<root>.TestData
       BLOCK_BODY
         RETURN type=kotlin.Nothing from='public open fun hashCode (): kotlin.Int declared in <root>.TestData'
           WHEN type=kotlin.Int origin=null
@@ -88,7 +88,7 @@ FILE fqName:<root> fileName:/kt31649.kt
     FUN GENERATED_DATA_CLASS_MEMBER name:toString visibility:public modality:OPEN <> ($this:<root>.TestData) 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>.TestData
+      $this: VALUE_PARAMETER name:<this> type:<root>.TestData
       BLOCK_BODY
         RETURN type=kotlin.Nothing from='public open fun toString (): kotlin.String declared in <root>.TestData'
           STRING_CONCATENATION type=kotlin.String
@@ -114,17 +114,17 @@ FILE fqName:<root> fileName:/kt31649.kt
           RETURN type=kotlin.Nothing from='public final fun <get-nn> (): kotlin.Nothing? declared in <root>.TestInline'
             GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:nn type:kotlin.Nothing? visibility:private [final]' type=kotlin.Nothing? origin=null
               receiver: GET_VAR '<this>: <root>.TestInline declared in <root>.TestInline.<get-nn>' type=<root>.TestInline origin=null
-    FUN GENERATED_SINGLE_FIELD_VALUE_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.TestInline, other:kotlin.Any?) returnType:kotlin.Boolean
+    FUN GENERATED_SINGLE_FIELD_VALUE_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.TestInline, 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 GENERATED_SINGLE_FIELD_VALUE_CLASS_MEMBER name:<this> type:<root>.TestInline
-      VALUE_PARAMETER GENERATED_SINGLE_FIELD_VALUE_CLASS_MEMBER name:other index:0 type:kotlin.Any?
+      $this: VALUE_PARAMETER name:<this> type:<root>.TestInline
+      VALUE_PARAMETER name:other index:0 type:kotlin.Any?
       BLOCK_BODY
         WHEN type=kotlin.Unit origin=null
           BRANCH
             if: TYPE_OP type=kotlin.Boolean origin=NOT_INSTANCEOF typeOperand=<root>.TestInline
               GET_VAR 'other: kotlin.Any? declared in <root>.TestInline.equals' type=kotlin.Any? origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.TestInline'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.TestInline'
               CONST Boolean type=kotlin.Boolean value=false
         VAR IR_TEMPORARY_VARIABLE name:tmp_1 type:<root>.TestInline [val]
           TYPE_OP type=<root>.TestInline origin=CAST typeOperand=<root>.TestInline
@@ -137,14 +137,14 @@ FILE fqName:<root> fileName:/kt31649.kt
                   receiver: GET_VAR '<this>: <root>.TestInline declared in <root>.TestInline.equals' type=<root>.TestInline origin=null
                 arg1: GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:nn type:kotlin.Nothing? visibility:private [final]' type=kotlin.Nothing? origin=null
                   receiver: GET_VAR 'val tmp_1: <root>.TestInline [val] declared in <root>.TestInline.equals' type=<root>.TestInline origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.TestInline'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.TestInline'
               CONST Boolean type=kotlin.Boolean value=false
-        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.TestInline'
+        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.TestInline'
           CONST Boolean type=kotlin.Boolean value=true
     FUN GENERATED_SINGLE_FIELD_VALUE_CLASS_MEMBER name:hashCode visibility:public modality:OPEN <> ($this:<root>.TestInline) returnType:kotlin.Int
       overridden:
         public open fun hashCode (): kotlin.Int declared in kotlin.Any
-      $this: VALUE_PARAMETER GENERATED_SINGLE_FIELD_VALUE_CLASS_MEMBER name:<this> type:<root>.TestInline
+      $this: VALUE_PARAMETER name:<this> type:<root>.TestInline
       BLOCK_BODY
         RETURN type=kotlin.Nothing from='public open fun hashCode (): kotlin.Int declared in <root>.TestInline'
           WHEN type=kotlin.Int origin=null
@@ -162,7 +162,7 @@ FILE fqName:<root> fileName:/kt31649.kt
     FUN GENERATED_SINGLE_FIELD_VALUE_CLASS_MEMBER name:toString visibility:public modality:OPEN <> ($this:<root>.TestInline) returnType:kotlin.String
       overridden:
         public open fun toString (): kotlin.String declared in kotlin.Any
-      $this: VALUE_PARAMETER GENERATED_SINGLE_FIELD_VALUE_CLASS_MEMBER name:<this> type:<root>.TestInline
+      $this: VALUE_PARAMETER name:<this> type:<root>.TestInline
       BLOCK_BODY
         RETURN type=kotlin.Nothing from='public open fun toString (): kotlin.String declared in <root>.TestInline'
           STRING_CONCATENATION type=kotlin.String
diff --git a/compiler/testData/ir/irText/classes/dataClasses/kt31649.fir.kt.txt b/compiler/testData/ir/irText/classes/dataClasses/kt31649.fir.kt.txt
index 620dd95de1a..d5026228662 100644
--- a/compiler/testData/ir/irText/classes/dataClasses/kt31649.fir.kt.txt
+++ b/compiler/testData/ir/irText/classes/dataClasses/kt31649.fir.kt.txt
@@ -17,7 +17,7 @@ data class TestData {
     return TestData(nn = nn)
   }
 
-  override fun equals(other: Any?): Boolean {
+  override operator fun equals(other: Any?): Boolean {
     when {
       EQEQEQ(arg0 = <this>, arg1 = other) -> return true
     }
@@ -55,7 +55,7 @@ value class TestInline {
     field = nn
     get
 
-  override fun equals(other: Any?): Boolean {
+  override operator fun equals(other: Any?): Boolean {
     when {
       other !is TestInline -> return false
     }
diff --git a/compiler/testData/ir/irText/classes/dataClasses/kt49936.fir.ir.txt b/compiler/testData/ir/irText/classes/dataClasses/kt49936.fir.ir.txt
index 56a6b2f5b3c..c3c7a2e7352 100644
--- a/compiler/testData/ir/irText/classes/dataClasses/kt49936.fir.ir.txt
+++ b/compiler/testData/ir/irText/classes/dataClasses/kt49936.fir.ir.txt
@@ -41,24 +41,24 @@ FILE fqName:<root> fileName:/kt49936.kt
         RETURN type=kotlin.Nothing from='public final fun copy (x: kotlin.Int): <root>.A declared in <root>.A'
           CONSTRUCTOR_CALL 'public constructor <init> (x: kotlin.Int) [primary] declared in <root>.A' type=<root>.A origin=null
             x: GET_VAR 'x: kotlin.Int declared in <root>.A.copy' type=kotlin.Int origin=null
-    FUN GENERATED_DATA_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.A, other:kotlin.Any?) returnType:kotlin.Boolean
+    FUN GENERATED_DATA_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.A, 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 GENERATED_DATA_CLASS_MEMBER name:<this> type:<root>.A
-      VALUE_PARAMETER GENERATED_DATA_CLASS_MEMBER name:other index:0 type:kotlin.Any?
+      $this: VALUE_PARAMETER name:<this> type:<root>.A
+      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>.A declared in <root>.A.equals' type=<root>.A origin=null
               arg1: GET_VAR 'other: kotlin.Any? declared in <root>.A.equals' type=kotlin.Any? origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.A'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.A'
               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>.A
               GET_VAR 'other: kotlin.Any? declared in <root>.A.equals' type=kotlin.Any? origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.A'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.A'
               CONST Boolean type=kotlin.Boolean value=false
         VAR IR_TEMPORARY_VARIABLE name:tmp_0 type:<root>.A [val]
           TYPE_OP type=<root>.A origin=CAST typeOperand=<root>.A
@@ -71,14 +71,14 @@ FILE fqName:<root> fileName:/kt49936.kt
                   receiver: GET_VAR '<this>: <root>.A declared in <root>.A.equals' type=<root>.A origin=null
                 arg1: GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:x type:kotlin.Int visibility:private [final]' type=kotlin.Int origin=null
                   receiver: GET_VAR 'val tmp_0: <root>.A [val] declared in <root>.A.equals' type=<root>.A origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.A'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.A'
               CONST Boolean type=kotlin.Boolean value=false
-        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.A'
+        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.A'
           CONST Boolean type=kotlin.Boolean value=true
     FUN GENERATED_DATA_CLASS_MEMBER name:hashCode visibility:public modality:OPEN <> ($this:<root>.A) 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>.A
+      $this: VALUE_PARAMETER name:<this> type:<root>.A
       BLOCK_BODY
         RETURN type=kotlin.Nothing from='public open fun hashCode (): kotlin.Int declared in <root>.A'
           CALL 'public open fun hashCode (): kotlin.Int [fake_override] declared in kotlin.Int' type=kotlin.Int origin=null
@@ -87,7 +87,7 @@ FILE fqName:<root> fileName:/kt49936.kt
     FUN GENERATED_DATA_CLASS_MEMBER name:toString visibility:public modality:OPEN <> ($this:<root>.A) 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>.A
+      $this: VALUE_PARAMETER name:<this> type:<root>.A
       BLOCK_BODY
         RETURN type=kotlin.Nothing from='public open fun toString (): kotlin.String declared in <root>.A'
           STRING_CONCATENATION type=kotlin.String
diff --git a/compiler/testData/ir/irText/classes/dataClasses/lambdaInDataClassDefaultParameter.fir.ir.txt b/compiler/testData/ir/irText/classes/dataClasses/lambdaInDataClassDefaultParameter.fir.ir.txt
index d2ef8f95e5e..8e10c97c3f1 100644
--- a/compiler/testData/ir/irText/classes/dataClasses/lambdaInDataClassDefaultParameter.fir.ir.txt
+++ b/compiler/testData/ir/irText/classes/dataClasses/lambdaInDataClassDefaultParameter.fir.ir.txt
@@ -41,24 +41,24 @@ FILE fqName:<root> fileName:/lambdaInDataClassDefaultParameter.kt
         RETURN type=kotlin.Nothing from='public final fun copy (runA: @[ExtensionFunctionType] kotlin.Function2<<root>.A, kotlin.String, kotlin.Unit>): <root>.A declared in <root>.A'
           CONSTRUCTOR_CALL 'public constructor <init> (runA: @[ExtensionFunctionType] kotlin.Function2<<root>.A, kotlin.String, kotlin.Unit>) [primary] declared in <root>.A' type=<root>.A origin=null
             runA: GET_VAR 'runA: @[ExtensionFunctionType] kotlin.Function2<<root>.A, kotlin.String, kotlin.Unit> declared in <root>.A.copy' type=@[ExtensionFunctionType] kotlin.Function2<<root>.A, kotlin.String, kotlin.Unit> origin=null
-    FUN GENERATED_DATA_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.A, other:kotlin.Any?) returnType:kotlin.Boolean
+    FUN GENERATED_DATA_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.A, 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 GENERATED_DATA_CLASS_MEMBER name:<this> type:<root>.A
-      VALUE_PARAMETER GENERATED_DATA_CLASS_MEMBER name:other index:0 type:kotlin.Any?
+      $this: VALUE_PARAMETER name:<this> type:<root>.A
+      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>.A declared in <root>.A.equals' type=<root>.A origin=null
               arg1: GET_VAR 'other: kotlin.Any? declared in <root>.A.equals' type=kotlin.Any? origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.A'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.A'
               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>.A
               GET_VAR 'other: kotlin.Any? declared in <root>.A.equals' type=kotlin.Any? origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.A'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.A'
               CONST Boolean type=kotlin.Boolean value=false
         VAR IR_TEMPORARY_VARIABLE name:tmp_0 type:<root>.A [val]
           TYPE_OP type=<root>.A origin=CAST typeOperand=<root>.A
@@ -71,14 +71,14 @@ FILE fqName:<root> fileName:/lambdaInDataClassDefaultParameter.kt
                   receiver: GET_VAR '<this>: <root>.A declared in <root>.A.equals' type=<root>.A origin=null
                 arg1: GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:runA type:@[ExtensionFunctionType] kotlin.Function2<<root>.A, kotlin.String, kotlin.Unit> visibility:private [final]' type=@[ExtensionFunctionType] kotlin.Function2<<root>.A, kotlin.String, kotlin.Unit> origin=null
                   receiver: GET_VAR 'val tmp_0: <root>.A [val] declared in <root>.A.equals' type=<root>.A origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.A'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.A'
               CONST Boolean type=kotlin.Boolean value=false
-        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.A'
+        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.A'
           CONST Boolean type=kotlin.Boolean value=true
     FUN GENERATED_DATA_CLASS_MEMBER name:hashCode visibility:public modality:OPEN <> ($this:<root>.A) 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>.A
+      $this: VALUE_PARAMETER name:<this> type:<root>.A
       BLOCK_BODY
         RETURN type=kotlin.Nothing from='public open fun hashCode (): kotlin.Int declared in <root>.A'
           CALL 'public open fun hashCode (): kotlin.Int [fake_override] declared in kotlin.Function2' type=kotlin.Int origin=null
@@ -87,7 +87,7 @@ FILE fqName:<root> fileName:/lambdaInDataClassDefaultParameter.kt
     FUN GENERATED_DATA_CLASS_MEMBER name:toString visibility:public modality:OPEN <> ($this:<root>.A) 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>.A
+      $this: VALUE_PARAMETER name:<this> type:<root>.A
       BLOCK_BODY
         RETURN type=kotlin.Nothing from='public open fun toString (): kotlin.String declared in <root>.A'
           STRING_CONCATENATION type=kotlin.String
@@ -151,24 +151,24 @@ FILE fqName:<root> fileName:/lambdaInDataClassDefaultParameter.kt
         RETURN type=kotlin.Nothing from='public final fun copy (x: kotlin.Any): <root>.B declared in <root>.B'
           CONSTRUCTOR_CALL 'public constructor <init> (x: kotlin.Any) [primary] declared in <root>.B' type=<root>.B origin=null
             x: GET_VAR 'x: kotlin.Any declared in <root>.B.copy' type=kotlin.Any origin=null
-    FUN GENERATED_DATA_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.B, other:kotlin.Any?) returnType:kotlin.Boolean
+    FUN GENERATED_DATA_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.B, 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 GENERATED_DATA_CLASS_MEMBER name:<this> type:<root>.B
-      VALUE_PARAMETER GENERATED_DATA_CLASS_MEMBER name:other index:0 type:kotlin.Any?
+      $this: VALUE_PARAMETER name:<this> type:<root>.B
+      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>.B declared in <root>.B.equals' type=<root>.B origin=null
               arg1: GET_VAR 'other: kotlin.Any? declared in <root>.B.equals' type=kotlin.Any? origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.B'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.B'
               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>.B
               GET_VAR 'other: kotlin.Any? declared in <root>.B.equals' type=kotlin.Any? origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.B'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.B'
               CONST Boolean type=kotlin.Boolean value=false
         VAR IR_TEMPORARY_VARIABLE name:tmp_1 type:<root>.B [val]
           TYPE_OP type=<root>.B origin=CAST typeOperand=<root>.B
@@ -181,14 +181,14 @@ FILE fqName:<root> fileName:/lambdaInDataClassDefaultParameter.kt
                   receiver: GET_VAR '<this>: <root>.B declared in <root>.B.equals' type=<root>.B origin=null
                 arg1: GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:x type:kotlin.Any visibility:private [final]' type=kotlin.Any origin=null
                   receiver: GET_VAR 'val tmp_1: <root>.B [val] declared in <root>.B.equals' type=<root>.B origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.B'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.B'
               CONST Boolean type=kotlin.Boolean value=false
-        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.B'
+        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.B'
           CONST Boolean type=kotlin.Boolean value=true
     FUN GENERATED_DATA_CLASS_MEMBER name:hashCode visibility:public modality:OPEN <> ($this:<root>.B) 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>.B
+      $this: VALUE_PARAMETER name:<this> type:<root>.B
       BLOCK_BODY
         RETURN type=kotlin.Nothing from='public open fun hashCode (): kotlin.Int declared in <root>.B'
           CALL 'public open fun hashCode (): kotlin.Int declared in kotlin.Any' type=kotlin.Int origin=null
@@ -197,7 +197,7 @@ FILE fqName:<root> fileName:/lambdaInDataClassDefaultParameter.kt
     FUN GENERATED_DATA_CLASS_MEMBER name:toString visibility:public modality:OPEN <> ($this:<root>.B) 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>.B
+      $this: VALUE_PARAMETER name:<this> type:<root>.B
       BLOCK_BODY
         RETURN type=kotlin.Nothing from='public open fun toString (): kotlin.String declared in <root>.B'
           STRING_CONCATENATION type=kotlin.String
diff --git a/compiler/testData/ir/irText/classes/dataClasses/lambdaInDataClassDefaultParameter.fir.kt.txt b/compiler/testData/ir/irText/classes/dataClasses/lambdaInDataClassDefaultParameter.fir.kt.txt
index a105fca2c6b..edf9c25d05a 100644
--- a/compiler/testData/ir/irText/classes/dataClasses/lambdaInDataClassDefaultParameter.fir.kt.txt
+++ b/compiler/testData/ir/irText/classes/dataClasses/lambdaInDataClassDefaultParameter.fir.kt.txt
@@ -20,7 +20,7 @@ data class A {
     return A(runA = runA)
   }
 
-  override fun equals(other: Any?): Boolean {
+  override operator fun equals(other: Any?): Boolean {
     when {
       EQEQEQ(arg0 = <this>, arg1 = other) -> return true
     }
@@ -74,7 +74,7 @@ data class B {
     return B(x = x)
   }
 
-  override fun equals(other: Any?): Boolean {
+  override operator fun equals(other: Any?): Boolean {
     when {
       EQEQEQ(arg0 = <this>, arg1 = other) -> return true
     }
diff --git a/compiler/testData/ir/irText/classes/dataClasses/openDataClass.fir.ir.txt b/compiler/testData/ir/irText/classes/dataClasses/openDataClass.fir.ir.txt
index b54278b772f..31c6a1a7fb0 100644
--- a/compiler/testData/ir/irText/classes/dataClasses/openDataClass.fir.ir.txt
+++ b/compiler/testData/ir/irText/classes/dataClasses/openDataClass.fir.ir.txt
@@ -58,24 +58,24 @@ FILE fqName:<root> fileName:/openDataClass.kt
           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 <> ($this:<root>.ValidatedProperties, other:kotlin.Any?) returnType:kotlin.Boolean
+    FUN GENERATED_DATA_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($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 GENERATED_DATA_CLASS_MEMBER name:<this> type:<root>.ValidatedProperties
-      VALUE_PARAMETER GENERATED_DATA_CLASS_MEMBER name:other index:0 type: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 declared in <root>.ValidatedProperties'
+            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 declared in <root>.ValidatedProperties'
+            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
@@ -88,7 +88,7 @@ FILE fqName:<root> fileName:/openDataClass.kt
                   $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'
+            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
@@ -98,14 +98,14 @@ FILE fqName:<root> fileName:/openDataClass.kt
                   $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
                   $this: GET_VAR 'val tmp_0: <root>.ValidatedProperties [val] declared in <root>.ValidatedProperties.equals' type=<root>.ValidatedProperties origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.ValidatedProperties'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.ValidatedProperties'
               CONST Boolean type=kotlin.Boolean value=false
-        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.ValidatedProperties'
+        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.ValidatedProperties'
           CONST Boolean type=kotlin.Boolean value=true
     FUN GENERATED_DATA_CLASS_MEMBER name:hashCode visibility:public modality:OPEN <> ($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
+      $this: VALUE_PARAMETER name:<this> type:<root>.ValidatedProperties
       BLOCK_BODY
         VAR name:result type:kotlin.Int [var]
           CALL 'public open fun hashCode (): kotlin.Int [fake_override] declared in kotlin.String' type=kotlin.Int origin=null
@@ -124,7 +124,7 @@ FILE fqName:<root> fileName:/openDataClass.kt
     FUN GENERATED_DATA_CLASS_MEMBER name:toString visibility:public modality:OPEN <> ($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
+      $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
diff --git a/compiler/testData/ir/irText/classes/dataClasses/openDataClass.fir.kt.txt b/compiler/testData/ir/irText/classes/dataClasses/openDataClass.fir.kt.txt
index 1ff6c00bba4..df2e708d446 100644
--- a/compiler/testData/ir/irText/classes/dataClasses/openDataClass.fir.kt.txt
+++ b/compiler/testData/ir/irText/classes/dataClasses/openDataClass.fir.kt.txt
@@ -26,7 +26,7 @@ open data class ValidatedProperties {
     return ValidatedProperties(test1 = test1, test2 = test2)
   }
 
-  override fun equals(other: Any?): Boolean {
+  override operator fun equals(other: Any?): Boolean {
     when {
       EQEQEQ(arg0 = <this>, arg1 = other) -> return true
     }
diff --git a/compiler/testData/ir/irText/classes/inlineClass.fir.ir.txt b/compiler/testData/ir/irText/classes/inlineClass.fir.ir.txt
index bbf189aa1e8..8ea3e588ad7 100644
--- a/compiler/testData/ir/irText/classes/inlineClass.fir.ir.txt
+++ b/compiler/testData/ir/irText/classes/inlineClass.fir.ir.txt
@@ -17,17 +17,17 @@ FILE fqName:<root> fileName:/inlineClass.kt
           RETURN type=kotlin.Nothing from='public final fun <get-x> (): kotlin.Int declared in <root>.Test'
             GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:x type:kotlin.Int visibility:private [final]' type=kotlin.Int origin=null
               receiver: GET_VAR '<this>: <root>.Test declared in <root>.Test.<get-x>' type=<root>.Test origin=null
-    FUN GENERATED_SINGLE_FIELD_VALUE_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.Test, other:kotlin.Any?) returnType:kotlin.Boolean
+    FUN GENERATED_SINGLE_FIELD_VALUE_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.Test, 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 GENERATED_SINGLE_FIELD_VALUE_CLASS_MEMBER name:<this> type:<root>.Test
-      VALUE_PARAMETER GENERATED_SINGLE_FIELD_VALUE_CLASS_MEMBER name:other index:0 type:kotlin.Any?
+      $this: VALUE_PARAMETER name:<this> type:<root>.Test
+      VALUE_PARAMETER name:other index:0 type:kotlin.Any?
       BLOCK_BODY
         WHEN type=kotlin.Unit origin=null
           BRANCH
             if: TYPE_OP type=kotlin.Boolean origin=NOT_INSTANCEOF typeOperand=<root>.Test
               GET_VAR 'other: kotlin.Any? declared in <root>.Test.equals' type=kotlin.Any? origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Test'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Test'
               CONST Boolean type=kotlin.Boolean value=false
         VAR IR_TEMPORARY_VARIABLE name:tmp_0 type:<root>.Test [val]
           TYPE_OP type=<root>.Test origin=CAST typeOperand=<root>.Test
@@ -40,14 +40,14 @@ FILE fqName:<root> fileName:/inlineClass.kt
                   receiver: GET_VAR '<this>: <root>.Test declared in <root>.Test.equals' type=<root>.Test origin=null
                 arg1: GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:x type:kotlin.Int visibility:private [final]' type=kotlin.Int origin=null
                   receiver: GET_VAR 'val tmp_0: <root>.Test [val] declared in <root>.Test.equals' type=<root>.Test origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Test'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Test'
               CONST Boolean type=kotlin.Boolean value=false
-        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Test'
+        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Test'
           CONST Boolean type=kotlin.Boolean value=true
     FUN GENERATED_SINGLE_FIELD_VALUE_CLASS_MEMBER name:hashCode visibility:public modality:OPEN <> ($this:<root>.Test) returnType:kotlin.Int
       overridden:
         public open fun hashCode (): kotlin.Int declared in kotlin.Any
-      $this: VALUE_PARAMETER GENERATED_SINGLE_FIELD_VALUE_CLASS_MEMBER name:<this> type:<root>.Test
+      $this: VALUE_PARAMETER name:<this> type:<root>.Test
       BLOCK_BODY
         RETURN type=kotlin.Nothing from='public open fun hashCode (): kotlin.Int declared in <root>.Test'
           CALL 'public open fun hashCode (): kotlin.Int [fake_override] declared in kotlin.Int' type=kotlin.Int origin=null
@@ -56,7 +56,7 @@ FILE fqName:<root> fileName:/inlineClass.kt
     FUN GENERATED_SINGLE_FIELD_VALUE_CLASS_MEMBER name:toString visibility:public modality:OPEN <> ($this:<root>.Test) returnType:kotlin.String
       overridden:
         public open fun toString (): kotlin.String declared in kotlin.Any
-      $this: VALUE_PARAMETER GENERATED_SINGLE_FIELD_VALUE_CLASS_MEMBER name:<this> type:<root>.Test
+      $this: VALUE_PARAMETER name:<this> type:<root>.Test
       BLOCK_BODY
         RETURN type=kotlin.Nothing from='public open fun toString (): kotlin.String declared in <root>.Test'
           STRING_CONCATENATION type=kotlin.String
diff --git a/compiler/testData/ir/irText/classes/inlineClass.fir.kt.txt b/compiler/testData/ir/irText/classes/inlineClass.fir.kt.txt
index a6ad5fee165..3c98ba9957b 100644
--- a/compiler/testData/ir/irText/classes/inlineClass.fir.kt.txt
+++ b/compiler/testData/ir/irText/classes/inlineClass.fir.kt.txt
@@ -9,7 +9,7 @@ value class Test {
     field = x
     get
 
-  override fun equals(other: Any?): Boolean {
+  override operator fun equals(other: Any?): Boolean {
     when {
       other !is Test -> return false
     }
diff --git a/compiler/testData/ir/irText/classes/inlineClassSyntheticMethods.fir.ir.txt b/compiler/testData/ir/irText/classes/inlineClassSyntheticMethods.fir.ir.txt
index 4a051babff1..334c6581bf5 100644
--- a/compiler/testData/ir/irText/classes/inlineClassSyntheticMethods.fir.ir.txt
+++ b/compiler/testData/ir/irText/classes/inlineClassSyntheticMethods.fir.ir.txt
@@ -62,17 +62,17 @@ FILE fqName:<root> fileName:/inlineClassSyntheticMethods.kt
           CALL 'public open fun hashCode (): kotlin.Int declared in <root>.C' type=kotlin.Int origin=null
             $this: CALL 'public final fun <get-c> (): <root>.C<TT of <root>.IC> declared in <root>.IC' type=<root>.C<TT of <root>.IC> origin=GET_PROPERTY
               $this: GET_VAR '<this>: <root>.IC<TT of <root>.IC> declared in <root>.IC.foo' type=<root>.IC<TT of <root>.IC> origin=null
-    FUN GENERATED_SINGLE_FIELD_VALUE_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.IC<TT of <root>.IC>, other:kotlin.Any?) returnType:kotlin.Boolean
+    FUN GENERATED_SINGLE_FIELD_VALUE_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.IC<TT of <root>.IC>, 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 GENERATED_SINGLE_FIELD_VALUE_CLASS_MEMBER name:<this> type:<root>.IC<TT of <root>.IC>
-      VALUE_PARAMETER GENERATED_SINGLE_FIELD_VALUE_CLASS_MEMBER name:other index:0 type:kotlin.Any?
+      $this: VALUE_PARAMETER name:<this> type:<root>.IC<TT of <root>.IC>
+      VALUE_PARAMETER name:other index:0 type:kotlin.Any?
       BLOCK_BODY
         WHEN type=kotlin.Unit origin=null
           BRANCH
             if: TYPE_OP type=kotlin.Boolean origin=NOT_INSTANCEOF typeOperand=<root>.IC<TT of <root>.IC>
               GET_VAR 'other: kotlin.Any? declared in <root>.IC.equals' type=kotlin.Any? origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.IC'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.IC'
               CONST Boolean type=kotlin.Boolean value=false
         VAR IR_TEMPORARY_VARIABLE name:tmp_0 type:<root>.IC<TT of <root>.IC> [val]
           TYPE_OP type=<root>.IC<TT of <root>.IC> origin=CAST typeOperand=<root>.IC<TT of <root>.IC>
@@ -85,14 +85,14 @@ FILE fqName:<root> fileName:/inlineClassSyntheticMethods.kt
                   receiver: GET_VAR '<this>: <root>.IC<TT of <root>.IC> declared in <root>.IC.equals' type=<root>.IC<TT of <root>.IC> origin=null
                 arg1: GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:c type:<root>.C<TT of <root>.IC> visibility:private [final]' type=<root>.C<TT of <root>.IC> origin=null
                   receiver: GET_VAR 'val tmp_0: <root>.IC<TT of <root>.IC> [val] declared in <root>.IC.equals' type=<root>.IC<TT of <root>.IC> origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.IC'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.IC'
               CONST Boolean type=kotlin.Boolean value=false
-        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.IC'
+        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.IC'
           CONST Boolean type=kotlin.Boolean value=true
     FUN GENERATED_SINGLE_FIELD_VALUE_CLASS_MEMBER name:hashCode visibility:public modality:OPEN <> ($this:<root>.IC<TT of <root>.IC>) returnType:kotlin.Int
       overridden:
         public open fun hashCode (): kotlin.Int declared in kotlin.Any
-      $this: VALUE_PARAMETER GENERATED_SINGLE_FIELD_VALUE_CLASS_MEMBER name:<this> type:<root>.IC<TT of <root>.IC>
+      $this: VALUE_PARAMETER name:<this> type:<root>.IC<TT of <root>.IC>
       BLOCK_BODY
         RETURN type=kotlin.Nothing from='public open fun hashCode (): kotlin.Int declared in <root>.IC'
           CALL 'public open fun hashCode (): kotlin.Int declared in <root>.C' type=kotlin.Int origin=null
@@ -101,7 +101,7 @@ FILE fqName:<root> fileName:/inlineClassSyntheticMethods.kt
     FUN GENERATED_SINGLE_FIELD_VALUE_CLASS_MEMBER name:toString visibility:public modality:OPEN <> ($this:<root>.IC<TT of <root>.IC>) returnType:kotlin.String
       overridden:
         public open fun toString (): kotlin.String declared in kotlin.Any
-      $this: VALUE_PARAMETER GENERATED_SINGLE_FIELD_VALUE_CLASS_MEMBER name:<this> type:<root>.IC<TT of <root>.IC>
+      $this: VALUE_PARAMETER name:<this> type:<root>.IC<TT of <root>.IC>
       BLOCK_BODY
         RETURN type=kotlin.Nothing from='public open fun toString (): kotlin.String declared in <root>.IC'
           STRING_CONCATENATION type=kotlin.String
diff --git a/compiler/testData/ir/irText/classes/inlineClassSyntheticMethods.fir.kt.txt b/compiler/testData/ir/irText/classes/inlineClassSyntheticMethods.fir.kt.txt
index fe5663ad27a..8748ba28319 100644
--- a/compiler/testData/ir/irText/classes/inlineClassSyntheticMethods.fir.kt.txt
+++ b/compiler/testData/ir/irText/classes/inlineClassSyntheticMethods.fir.kt.txt
@@ -30,7 +30,7 @@ value class IC<TT : Any?> {
     return <this>.<get-c>().hashCode()
   }
 
-  override fun equals(other: Any?): Boolean {
+  override operator fun equals(other: Any?): Boolean {
     when {
       other !is IC<TT> -> return false
     }
diff --git a/compiler/testData/ir/irText/declarations/contextReceivers/arrayAccessCompositeOperators.fir.ir.txt b/compiler/testData/ir/irText/declarations/contextReceivers/arrayAccessCompositeOperators.fir.ir.txt
index afe414bddef..4d49168eaec 100644
--- a/compiler/testData/ir/irText/declarations/contextReceivers/arrayAccessCompositeOperators.fir.ir.txt
+++ b/compiler/testData/ir/irText/declarations/contextReceivers/arrayAccessCompositeOperators.fir.ir.txt
@@ -41,24 +41,24 @@ FILE fqName:<root> fileName:/arrayAccessCompositeOperators.kt
         RETURN type=kotlin.Nothing from='public final fun copy (i: kotlin.Int): <root>.MyContainer declared in <root>.MyContainer'
           CONSTRUCTOR_CALL 'public constructor <init> (i: kotlin.Int) [primary] declared in <root>.MyContainer' type=<root>.MyContainer origin=null
             i: GET_VAR 'i: kotlin.Int declared in <root>.MyContainer.copy' type=kotlin.Int origin=null
-    FUN GENERATED_DATA_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.MyContainer, other:kotlin.Any?) returnType:kotlin.Boolean
+    FUN GENERATED_DATA_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.MyContainer, 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 GENERATED_DATA_CLASS_MEMBER name:<this> type:<root>.MyContainer
-      VALUE_PARAMETER GENERATED_DATA_CLASS_MEMBER name:other index:0 type:kotlin.Any?
+      $this: VALUE_PARAMETER name:<this> type:<root>.MyContainer
+      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>.MyContainer declared in <root>.MyContainer.equals' type=<root>.MyContainer origin=null
               arg1: GET_VAR 'other: kotlin.Any? declared in <root>.MyContainer.equals' type=kotlin.Any? origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.MyContainer'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.MyContainer'
               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>.MyContainer
               GET_VAR 'other: kotlin.Any? declared in <root>.MyContainer.equals' type=kotlin.Any? origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.MyContainer'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.MyContainer'
               CONST Boolean type=kotlin.Boolean value=false
         VAR IR_TEMPORARY_VARIABLE name:tmp_0 type:<root>.MyContainer [val]
           TYPE_OP type=<root>.MyContainer origin=CAST typeOperand=<root>.MyContainer
@@ -71,14 +71,14 @@ FILE fqName:<root> fileName:/arrayAccessCompositeOperators.kt
                   receiver: GET_VAR '<this>: <root>.MyContainer declared in <root>.MyContainer.equals' type=<root>.MyContainer origin=null
                 arg1: GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:i type:kotlin.Int visibility:private' type=kotlin.Int origin=null
                   receiver: GET_VAR 'val tmp_0: <root>.MyContainer [val] declared in <root>.MyContainer.equals' type=<root>.MyContainer origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.MyContainer'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.MyContainer'
               CONST Boolean type=kotlin.Boolean value=false
-        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.MyContainer'
+        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.MyContainer'
           CONST Boolean type=kotlin.Boolean value=true
     FUN GENERATED_DATA_CLASS_MEMBER name:hashCode visibility:public modality:OPEN <> ($this:<root>.MyContainer) 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>.MyContainer
+      $this: VALUE_PARAMETER name:<this> type:<root>.MyContainer
       BLOCK_BODY
         RETURN type=kotlin.Nothing from='public open fun hashCode (): kotlin.Int declared in <root>.MyContainer'
           CALL 'public open fun hashCode (): kotlin.Int [fake_override] declared in kotlin.Int' type=kotlin.Int origin=null
@@ -87,7 +87,7 @@ FILE fqName:<root> fileName:/arrayAccessCompositeOperators.kt
     FUN GENERATED_DATA_CLASS_MEMBER name:toString visibility:public modality:OPEN <> ($this:<root>.MyContainer) 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>.MyContainer
+      $this: VALUE_PARAMETER name:<this> type:<root>.MyContainer
       BLOCK_BODY
         RETURN type=kotlin.Nothing from='public open fun toString (): kotlin.String declared in <root>.MyContainer'
           STRING_CONCATENATION type=kotlin.String
diff --git a/compiler/testData/ir/irText/declarations/contextReceivers/arrayAccessCompositeOperators.fir.kt.txt b/compiler/testData/ir/irText/declarations/contextReceivers/arrayAccessCompositeOperators.fir.kt.txt
index 324c09a7a85..4eb2b95cb1d 100644
--- a/compiler/testData/ir/irText/declarations/contextReceivers/arrayAccessCompositeOperators.fir.kt.txt
+++ b/compiler/testData/ir/irText/declarations/contextReceivers/arrayAccessCompositeOperators.fir.kt.txt
@@ -18,7 +18,7 @@ data class MyContainer {
     return MyContainer(i = i)
   }
 
-  override fun equals(other: Any?): Boolean {
+  override operator fun equals(other: Any?): Boolean {
     when {
       EQEQEQ(arg0 = <this>, arg1 = other) -> return true
     }
diff --git a/compiler/testData/ir/irText/declarations/contextReceivers/arrayAccessOperators.fir.ir.txt b/compiler/testData/ir/irText/declarations/contextReceivers/arrayAccessOperators.fir.ir.txt
index 44b5c2a1e87..91a59d5888f 100644
--- a/compiler/testData/ir/irText/declarations/contextReceivers/arrayAccessOperators.fir.ir.txt
+++ b/compiler/testData/ir/irText/declarations/contextReceivers/arrayAccessOperators.fir.ir.txt
@@ -41,24 +41,24 @@ FILE fqName:<root> fileName:/arrayAccessOperators.kt
         RETURN type=kotlin.Nothing from='public final fun copy (s: kotlin.String): <root>.MyContainer declared in <root>.MyContainer'
           CONSTRUCTOR_CALL 'public constructor <init> (s: kotlin.String) [primary] declared in <root>.MyContainer' type=<root>.MyContainer origin=null
             s: GET_VAR 's: kotlin.String declared in <root>.MyContainer.copy' type=kotlin.String origin=null
-    FUN GENERATED_DATA_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.MyContainer, other:kotlin.Any?) returnType:kotlin.Boolean
+    FUN GENERATED_DATA_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.MyContainer, 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 GENERATED_DATA_CLASS_MEMBER name:<this> type:<root>.MyContainer
-      VALUE_PARAMETER GENERATED_DATA_CLASS_MEMBER name:other index:0 type:kotlin.Any?
+      $this: VALUE_PARAMETER name:<this> type:<root>.MyContainer
+      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>.MyContainer declared in <root>.MyContainer.equals' type=<root>.MyContainer origin=null
               arg1: GET_VAR 'other: kotlin.Any? declared in <root>.MyContainer.equals' type=kotlin.Any? origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.MyContainer'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.MyContainer'
               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>.MyContainer
               GET_VAR 'other: kotlin.Any? declared in <root>.MyContainer.equals' type=kotlin.Any? origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.MyContainer'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.MyContainer'
               CONST Boolean type=kotlin.Boolean value=false
         VAR IR_TEMPORARY_VARIABLE name:tmp_0 type:<root>.MyContainer [val]
           TYPE_OP type=<root>.MyContainer origin=CAST typeOperand=<root>.MyContainer
@@ -71,14 +71,14 @@ FILE fqName:<root> fileName:/arrayAccessOperators.kt
                   receiver: GET_VAR '<this>: <root>.MyContainer declared in <root>.MyContainer.equals' type=<root>.MyContainer origin=null
                 arg1: GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:s type:kotlin.String visibility:private' type=kotlin.String origin=null
                   receiver: GET_VAR 'val tmp_0: <root>.MyContainer [val] declared in <root>.MyContainer.equals' type=<root>.MyContainer origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.MyContainer'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.MyContainer'
               CONST Boolean type=kotlin.Boolean value=false
-        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.MyContainer'
+        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.MyContainer'
           CONST Boolean type=kotlin.Boolean value=true
     FUN GENERATED_DATA_CLASS_MEMBER name:hashCode visibility:public modality:OPEN <> ($this:<root>.MyContainer) 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>.MyContainer
+      $this: VALUE_PARAMETER name:<this> type:<root>.MyContainer
       BLOCK_BODY
         RETURN type=kotlin.Nothing from='public open fun hashCode (): kotlin.Int declared in <root>.MyContainer'
           CALL 'public open fun hashCode (): kotlin.Int [fake_override] declared in kotlin.String' type=kotlin.Int origin=null
@@ -87,7 +87,7 @@ FILE fqName:<root> fileName:/arrayAccessOperators.kt
     FUN GENERATED_DATA_CLASS_MEMBER name:toString visibility:public modality:OPEN <> ($this:<root>.MyContainer) 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>.MyContainer
+      $this: VALUE_PARAMETER name:<this> type:<root>.MyContainer
       BLOCK_BODY
         RETURN type=kotlin.Nothing from='public open fun toString (): kotlin.String declared in <root>.MyContainer'
           STRING_CONCATENATION type=kotlin.String
diff --git a/compiler/testData/ir/irText/declarations/contextReceivers/arrayAccessOperators.fir.kt.txt b/compiler/testData/ir/irText/declarations/contextReceivers/arrayAccessOperators.fir.kt.txt
index 6dc37958633..6e44a205a52 100644
--- a/compiler/testData/ir/irText/declarations/contextReceivers/arrayAccessOperators.fir.kt.txt
+++ b/compiler/testData/ir/irText/declarations/contextReceivers/arrayAccessOperators.fir.kt.txt
@@ -18,7 +18,7 @@ data class MyContainer {
     return MyContainer(s = s)
   }
 
-  override fun equals(other: Any?): Boolean {
+  override operator fun equals(other: Any?): Boolean {
     when {
       EQEQEQ(arg0 = <this>, arg1 = other) -> return true
     }
diff --git a/compiler/testData/ir/irText/declarations/contextReceivers/compoundAssignmentOperators.fir.ir.txt b/compiler/testData/ir/irText/declarations/contextReceivers/compoundAssignmentOperators.fir.ir.txt
index 707b7a0df7d..3a8de1b5bad 100644
--- a/compiler/testData/ir/irText/declarations/contextReceivers/compoundAssignmentOperators.fir.ir.txt
+++ b/compiler/testData/ir/irText/declarations/contextReceivers/compoundAssignmentOperators.fir.ir.txt
@@ -41,24 +41,24 @@ FILE fqName:<root> fileName:/compoundAssignmentOperators.kt
         RETURN type=kotlin.Nothing from='public final fun copy (i: kotlin.Int): <root>.Result declared in <root>.Result'
           CONSTRUCTOR_CALL 'public constructor <init> (i: kotlin.Int) [primary] declared in <root>.Result' type=<root>.Result origin=null
             i: GET_VAR 'i: kotlin.Int declared in <root>.Result.copy' type=kotlin.Int origin=null
-    FUN GENERATED_DATA_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.Result, other:kotlin.Any?) returnType:kotlin.Boolean
+    FUN GENERATED_DATA_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.Result, 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 GENERATED_DATA_CLASS_MEMBER name:<this> type:<root>.Result
-      VALUE_PARAMETER GENERATED_DATA_CLASS_MEMBER name:other index:0 type:kotlin.Any?
+      $this: VALUE_PARAMETER name:<this> type:<root>.Result
+      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>.Result declared in <root>.Result.equals' type=<root>.Result origin=null
               arg1: GET_VAR 'other: kotlin.Any? declared in <root>.Result.equals' type=kotlin.Any? origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Result'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Result'
               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>.Result
               GET_VAR 'other: kotlin.Any? declared in <root>.Result.equals' type=kotlin.Any? origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Result'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Result'
               CONST Boolean type=kotlin.Boolean value=false
         VAR IR_TEMPORARY_VARIABLE name:tmp_0 type:<root>.Result [val]
           TYPE_OP type=<root>.Result origin=CAST typeOperand=<root>.Result
@@ -71,14 +71,14 @@ FILE fqName:<root> fileName:/compoundAssignmentOperators.kt
                   receiver: GET_VAR '<this>: <root>.Result declared in <root>.Result.equals' type=<root>.Result origin=null
                 arg1: GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:i type:kotlin.Int visibility:private' type=kotlin.Int origin=null
                   receiver: GET_VAR 'val tmp_0: <root>.Result [val] declared in <root>.Result.equals' type=<root>.Result origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Result'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Result'
               CONST Boolean type=kotlin.Boolean value=false
-        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Result'
+        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Result'
           CONST Boolean type=kotlin.Boolean value=true
     FUN GENERATED_DATA_CLASS_MEMBER name:hashCode visibility:public modality:OPEN <> ($this:<root>.Result) 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>.Result
+      $this: VALUE_PARAMETER name:<this> type:<root>.Result
       BLOCK_BODY
         RETURN type=kotlin.Nothing from='public open fun hashCode (): kotlin.Int declared in <root>.Result'
           CALL 'public open fun hashCode (): kotlin.Int [fake_override] declared in kotlin.Int' type=kotlin.Int origin=null
@@ -87,7 +87,7 @@ FILE fqName:<root> fileName:/compoundAssignmentOperators.kt
     FUN GENERATED_DATA_CLASS_MEMBER name:toString visibility:public modality:OPEN <> ($this:<root>.Result) 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>.Result
+      $this: VALUE_PARAMETER name:<this> type:<root>.Result
       BLOCK_BODY
         RETURN type=kotlin.Nothing from='public open fun toString (): kotlin.String declared in <root>.Result'
           STRING_CONCATENATION type=kotlin.String
diff --git a/compiler/testData/ir/irText/declarations/contextReceivers/compoundAssignmentOperators.fir.kt.txt b/compiler/testData/ir/irText/declarations/contextReceivers/compoundAssignmentOperators.fir.kt.txt
index b36952aa74e..278afae306a 100644
--- a/compiler/testData/ir/irText/declarations/contextReceivers/compoundAssignmentOperators.fir.kt.txt
+++ b/compiler/testData/ir/irText/declarations/contextReceivers/compoundAssignmentOperators.fir.kt.txt
@@ -18,7 +18,7 @@ data class Result {
     return Result(i = i)
   }
 
-  override fun equals(other: Any?): Boolean {
+  override operator fun equals(other: Any?): Boolean {
     when {
       EQEQEQ(arg0 = <this>, arg1 = other) -> return true
     }
diff --git a/compiler/testData/ir/irText/declarations/contextReceivers/fromKEEP/compareTo.fir.ir.txt b/compiler/testData/ir/irText/declarations/contextReceivers/fromKEEP/compareTo.fir.ir.txt
index 0f0f799ee2d..ddcefedd046 100644
--- a/compiler/testData/ir/irText/declarations/contextReceivers/fromKEEP/compareTo.fir.ir.txt
+++ b/compiler/testData/ir/irText/declarations/contextReceivers/fromKEEP/compareTo.fir.ir.txt
@@ -60,24 +60,24 @@ FILE fqName:<root> fileName:/compareTo.kt
             <class: B>: kotlin.Any
             first: GET_VAR 'first: A of <root>.Pair declared in <root>.Pair.copy' type=A of <root>.Pair origin=null
             second: GET_VAR 'second: B of <root>.Pair declared in <root>.Pair.copy' type=B of <root>.Pair origin=null
-    FUN GENERATED_DATA_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.Pair<A of <root>.Pair, B of <root>.Pair>, other:kotlin.Any?) returnType:kotlin.Boolean
+    FUN GENERATED_DATA_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.Pair<A of <root>.Pair, B of <root>.Pair>, 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 GENERATED_DATA_CLASS_MEMBER name:<this> type:<root>.Pair<A of <root>.Pair, B of <root>.Pair>
-      VALUE_PARAMETER GENERATED_DATA_CLASS_MEMBER name:other index:0 type:kotlin.Any?
+      $this: VALUE_PARAMETER name:<this> type:<root>.Pair<A of <root>.Pair, B of <root>.Pair>
+      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>.Pair<A of <root>.Pair, B of <root>.Pair> declared in <root>.Pair.equals' type=<root>.Pair<A of <root>.Pair, B of <root>.Pair> origin=null
               arg1: GET_VAR 'other: kotlin.Any? declared in <root>.Pair.equals' type=kotlin.Any? origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Pair'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Pair'
               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>.Pair<A of <root>.Pair, B of <root>.Pair>
               GET_VAR 'other: kotlin.Any? declared in <root>.Pair.equals' type=kotlin.Any? origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Pair'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Pair'
               CONST Boolean type=kotlin.Boolean value=false
         VAR IR_TEMPORARY_VARIABLE name:tmp_0 type:<root>.Pair<A of <root>.Pair, B of <root>.Pair> [val]
           TYPE_OP type=<root>.Pair<A of <root>.Pair, B of <root>.Pair> origin=CAST typeOperand=<root>.Pair<A of <root>.Pair, B of <root>.Pair>
@@ -90,7 +90,7 @@ FILE fqName:<root> fileName:/compareTo.kt
                   receiver: GET_VAR '<this>: <root>.Pair<A of <root>.Pair, B of <root>.Pair> declared in <root>.Pair.equals' type=<root>.Pair<A of <root>.Pair, B of <root>.Pair> origin=null
                 arg1: GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:first type:A of <root>.Pair visibility:private [final]' type=A of <root>.Pair origin=null
                   receiver: GET_VAR 'val tmp_0: <root>.Pair<A of <root>.Pair, B of <root>.Pair> [val] declared in <root>.Pair.equals' type=<root>.Pair<A of <root>.Pair, B of <root>.Pair> origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Pair'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Pair'
               CONST Boolean type=kotlin.Boolean value=false
         WHEN type=kotlin.Unit origin=null
           BRANCH
@@ -100,14 +100,14 @@ FILE fqName:<root> fileName:/compareTo.kt
                   receiver: GET_VAR '<this>: <root>.Pair<A of <root>.Pair, B of <root>.Pair> declared in <root>.Pair.equals' type=<root>.Pair<A of <root>.Pair, B of <root>.Pair> origin=null
                 arg1: GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:second type:B of <root>.Pair visibility:private [final]' type=B of <root>.Pair origin=null
                   receiver: GET_VAR 'val tmp_0: <root>.Pair<A of <root>.Pair, B of <root>.Pair> [val] declared in <root>.Pair.equals' type=<root>.Pair<A of <root>.Pair, B of <root>.Pair> origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Pair'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Pair'
               CONST Boolean type=kotlin.Boolean value=false
-        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Pair'
+        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Pair'
           CONST Boolean type=kotlin.Boolean value=true
     FUN GENERATED_DATA_CLASS_MEMBER name:hashCode visibility:public modality:OPEN <> ($this:<root>.Pair<A of <root>.Pair, B of <root>.Pair>) 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>.Pair<A of <root>.Pair, B of <root>.Pair>
+      $this: VALUE_PARAMETER name:<this> type:<root>.Pair<A of <root>.Pair, B of <root>.Pair>
       BLOCK_BODY
         VAR name:result type:kotlin.Int [var]
           WHEN type=kotlin.Int origin=null
@@ -144,7 +144,7 @@ FILE fqName:<root> fileName:/compareTo.kt
     FUN GENERATED_DATA_CLASS_MEMBER name:toString visibility:public modality:OPEN <> ($this:<root>.Pair<A of <root>.Pair, B of <root>.Pair>) 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>.Pair<A of <root>.Pair, B of <root>.Pair>
+      $this: VALUE_PARAMETER name:<this> type:<root>.Pair<A of <root>.Pair, B of <root>.Pair>
       BLOCK_BODY
         RETURN type=kotlin.Nothing from='public open fun toString (): kotlin.String declared in <root>.Pair'
           STRING_CONCATENATION type=kotlin.String
diff --git a/compiler/testData/ir/irText/declarations/contextReceivers/fromKEEP/compareTo.fir.kt.txt b/compiler/testData/ir/irText/declarations/contextReceivers/fromKEEP/compareTo.fir.kt.txt
index 8aa5ed01bda..da17cb84ece 100644
--- a/compiler/testData/ir/irText/declarations/contextReceivers/fromKEEP/compareTo.fir.kt.txt
+++ b/compiler/testData/ir/irText/declarations/contextReceivers/fromKEEP/compareTo.fir.kt.txt
@@ -25,7 +25,7 @@ data class Pair<A : Any?, B : Any?> {
     return Pair<Any, Any>(first = first, second = second)
   }
 
-  override fun equals(other: Any?): Boolean {
+  override operator fun equals(other: Any?): Boolean {
     when {
       EQEQEQ(arg0 = <this>, arg1 = other) -> return true
     }
diff --git a/compiler/testData/ir/irText/declarations/contextReceivers/iteratorOperator.fir.ir.txt b/compiler/testData/ir/irText/declarations/contextReceivers/iteratorOperator.fir.ir.txt
index 6ef5b97bd44..5f82dcaf15a 100644
--- a/compiler/testData/ir/irText/declarations/contextReceivers/iteratorOperator.fir.ir.txt
+++ b/compiler/testData/ir/irText/declarations/contextReceivers/iteratorOperator.fir.ir.txt
@@ -43,24 +43,24 @@ FILE fqName:<root> fileName:/iteratorOperator.kt
         RETURN type=kotlin.Nothing from='public final fun copy (i: kotlin.Int): <root>.Counter declared in <root>.Counter'
           CONSTRUCTOR_CALL 'public constructor <init> (i: kotlin.Int) [primary] declared in <root>.Counter' type=<root>.Counter origin=null
             i: GET_VAR 'i: kotlin.Int declared in <root>.Counter.copy' type=kotlin.Int origin=null
-    FUN GENERATED_DATA_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.Counter, other:kotlin.Any?) returnType:kotlin.Boolean
+    FUN GENERATED_DATA_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.Counter, 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 GENERATED_DATA_CLASS_MEMBER name:<this> type:<root>.Counter
-      VALUE_PARAMETER GENERATED_DATA_CLASS_MEMBER name:other index:0 type:kotlin.Any?
+      $this: VALUE_PARAMETER name:<this> type:<root>.Counter
+      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>.Counter declared in <root>.Counter.equals' type=<root>.Counter origin=null
               arg1: GET_VAR 'other: kotlin.Any? declared in <root>.Counter.equals' type=kotlin.Any? origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Counter'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Counter'
               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>.Counter
               GET_VAR 'other: kotlin.Any? declared in <root>.Counter.equals' type=kotlin.Any? origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Counter'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Counter'
               CONST Boolean type=kotlin.Boolean value=false
         VAR IR_TEMPORARY_VARIABLE name:tmp_0 type:<root>.Counter [val]
           TYPE_OP type=<root>.Counter origin=CAST typeOperand=<root>.Counter
@@ -73,14 +73,14 @@ FILE fqName:<root> fileName:/iteratorOperator.kt
                   receiver: GET_VAR '<this>: <root>.Counter declared in <root>.Counter.equals' type=<root>.Counter origin=null
                 arg1: GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:i type:kotlin.Int visibility:private' type=kotlin.Int origin=null
                   receiver: GET_VAR 'val tmp_0: <root>.Counter [val] declared in <root>.Counter.equals' type=<root>.Counter origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Counter'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Counter'
               CONST Boolean type=kotlin.Boolean value=false
-        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Counter'
+        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Counter'
           CONST Boolean type=kotlin.Boolean value=true
     FUN GENERATED_DATA_CLASS_MEMBER name:hashCode visibility:public modality:OPEN <> ($this:<root>.Counter) 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>.Counter
+      $this: VALUE_PARAMETER name:<this> type:<root>.Counter
       BLOCK_BODY
         RETURN type=kotlin.Nothing from='public open fun hashCode (): kotlin.Int declared in <root>.Counter'
           CALL 'public open fun hashCode (): kotlin.Int [fake_override] declared in kotlin.Int' type=kotlin.Int origin=null
@@ -89,7 +89,7 @@ FILE fqName:<root> fileName:/iteratorOperator.kt
     FUN GENERATED_DATA_CLASS_MEMBER name:toString visibility:public modality:OPEN <> ($this:<root>.Counter) 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>.Counter
+      $this: VALUE_PARAMETER name:<this> type:<root>.Counter
       BLOCK_BODY
         RETURN type=kotlin.Nothing from='public open fun toString (): kotlin.String declared in <root>.Counter'
           STRING_CONCATENATION type=kotlin.String
@@ -133,24 +133,24 @@ FILE fqName:<root> fileName:/iteratorOperator.kt
         RETURN type=kotlin.Nothing from='public final fun copy (max: kotlin.Int): <root>.CounterConfig declared in <root>.CounterConfig'
           CONSTRUCTOR_CALL 'public constructor <init> (max: kotlin.Int) [primary] declared in <root>.CounterConfig' type=<root>.CounterConfig origin=null
             max: GET_VAR 'max: kotlin.Int declared in <root>.CounterConfig.copy' type=kotlin.Int origin=null
-    FUN GENERATED_DATA_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.CounterConfig, other:kotlin.Any?) returnType:kotlin.Boolean
+    FUN GENERATED_DATA_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.CounterConfig, 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 GENERATED_DATA_CLASS_MEMBER name:<this> type:<root>.CounterConfig
-      VALUE_PARAMETER GENERATED_DATA_CLASS_MEMBER name:other index:0 type:kotlin.Any?
+      $this: VALUE_PARAMETER name:<this> type:<root>.CounterConfig
+      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>.CounterConfig declared in <root>.CounterConfig.equals' type=<root>.CounterConfig origin=null
               arg1: GET_VAR 'other: kotlin.Any? declared in <root>.CounterConfig.equals' type=kotlin.Any? origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.CounterConfig'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.CounterConfig'
               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>.CounterConfig
               GET_VAR 'other: kotlin.Any? declared in <root>.CounterConfig.equals' type=kotlin.Any? origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.CounterConfig'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.CounterConfig'
               CONST Boolean type=kotlin.Boolean value=false
         VAR IR_TEMPORARY_VARIABLE name:tmp_1 type:<root>.CounterConfig [val]
           TYPE_OP type=<root>.CounterConfig origin=CAST typeOperand=<root>.CounterConfig
@@ -163,14 +163,14 @@ FILE fqName:<root> fileName:/iteratorOperator.kt
                   receiver: GET_VAR '<this>: <root>.CounterConfig declared in <root>.CounterConfig.equals' type=<root>.CounterConfig origin=null
                 arg1: GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:max type:kotlin.Int visibility:private [final]' type=kotlin.Int origin=null
                   receiver: GET_VAR 'val tmp_1: <root>.CounterConfig [val] declared in <root>.CounterConfig.equals' type=<root>.CounterConfig origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.CounterConfig'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.CounterConfig'
               CONST Boolean type=kotlin.Boolean value=false
-        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.CounterConfig'
+        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.CounterConfig'
           CONST Boolean type=kotlin.Boolean value=true
     FUN GENERATED_DATA_CLASS_MEMBER name:hashCode visibility:public modality:OPEN <> ($this:<root>.CounterConfig) 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>.CounterConfig
+      $this: VALUE_PARAMETER name:<this> type:<root>.CounterConfig
       BLOCK_BODY
         RETURN type=kotlin.Nothing from='public open fun hashCode (): kotlin.Int declared in <root>.CounterConfig'
           CALL 'public open fun hashCode (): kotlin.Int [fake_override] declared in kotlin.Int' type=kotlin.Int origin=null
@@ -179,7 +179,7 @@ FILE fqName:<root> fileName:/iteratorOperator.kt
     FUN GENERATED_DATA_CLASS_MEMBER name:toString visibility:public modality:OPEN <> ($this:<root>.CounterConfig) 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>.CounterConfig
+      $this: VALUE_PARAMETER name:<this> type:<root>.CounterConfig
       BLOCK_BODY
         RETURN type=kotlin.Nothing from='public open fun toString (): kotlin.String declared in <root>.CounterConfig'
           STRING_CONCATENATION type=kotlin.String
diff --git a/compiler/testData/ir/irText/declarations/contextReceivers/iteratorOperator.fir.kt.txt b/compiler/testData/ir/irText/declarations/contextReceivers/iteratorOperator.fir.kt.txt
index 70fc98d5058..466d67c935d 100644
--- a/compiler/testData/ir/irText/declarations/contextReceivers/iteratorOperator.fir.kt.txt
+++ b/compiler/testData/ir/irText/declarations/contextReceivers/iteratorOperator.fir.kt.txt
@@ -18,7 +18,7 @@ data class Counter {
     return Counter(i = i)
   }
 
-  override fun equals(other: Any?): Boolean {
+  override operator fun equals(other: Any?): Boolean {
     when {
       EQEQEQ(arg0 = <this>, arg1 = other) -> return true
     }
@@ -61,7 +61,7 @@ data class CounterConfig {
     return CounterConfig(max = max)
   }
 
-  override fun equals(other: Any?): Boolean {
+  override operator fun equals(other: Any?): Boolean {
     when {
       EQEQEQ(arg0 = <this>, arg1 = other) -> return true
     }
diff --git a/compiler/testData/ir/irText/declarations/contextReceivers/unaryOperators.fir.ir.txt b/compiler/testData/ir/irText/declarations/contextReceivers/unaryOperators.fir.ir.txt
index 47a23ce29c0..6f59ac698be 100644
--- a/compiler/testData/ir/irText/declarations/contextReceivers/unaryOperators.fir.ir.txt
+++ b/compiler/testData/ir/irText/declarations/contextReceivers/unaryOperators.fir.ir.txt
@@ -33,24 +33,24 @@ FILE fqName:<root> fileName:/unaryOperators.kt
         RETURN type=kotlin.Nothing from='public final fun copy (i: kotlin.Int): <root>.Result declared in <root>.Result'
           CONSTRUCTOR_CALL 'public constructor <init> (i: kotlin.Int) [primary] declared in <root>.Result' type=<root>.Result origin=null
             i: GET_VAR 'i: kotlin.Int declared in <root>.Result.copy' type=kotlin.Int origin=null
-    FUN GENERATED_DATA_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.Result, other:kotlin.Any?) returnType:kotlin.Boolean
+    FUN GENERATED_DATA_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.Result, 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 GENERATED_DATA_CLASS_MEMBER name:<this> type:<root>.Result
-      VALUE_PARAMETER GENERATED_DATA_CLASS_MEMBER name:other index:0 type:kotlin.Any?
+      $this: VALUE_PARAMETER name:<this> type:<root>.Result
+      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>.Result declared in <root>.Result.equals' type=<root>.Result origin=null
               arg1: GET_VAR 'other: kotlin.Any? declared in <root>.Result.equals' type=kotlin.Any? origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Result'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Result'
               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>.Result
               GET_VAR 'other: kotlin.Any? declared in <root>.Result.equals' type=kotlin.Any? origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Result'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Result'
               CONST Boolean type=kotlin.Boolean value=false
         VAR IR_TEMPORARY_VARIABLE name:tmp_0 type:<root>.Result [val]
           TYPE_OP type=<root>.Result origin=CAST typeOperand=<root>.Result
@@ -63,14 +63,14 @@ FILE fqName:<root> fileName:/unaryOperators.kt
                   receiver: GET_VAR '<this>: <root>.Result declared in <root>.Result.equals' type=<root>.Result origin=null
                 arg1: GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:i type:kotlin.Int visibility:private [final]' type=kotlin.Int origin=null
                   receiver: GET_VAR 'val tmp_0: <root>.Result [val] declared in <root>.Result.equals' type=<root>.Result origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Result'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Result'
               CONST Boolean type=kotlin.Boolean value=false
-        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Result'
+        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Result'
           CONST Boolean type=kotlin.Boolean value=true
     FUN GENERATED_DATA_CLASS_MEMBER name:hashCode visibility:public modality:OPEN <> ($this:<root>.Result) 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>.Result
+      $this: VALUE_PARAMETER name:<this> type:<root>.Result
       BLOCK_BODY
         RETURN type=kotlin.Nothing from='public open fun hashCode (): kotlin.Int declared in <root>.Result'
           CALL 'public open fun hashCode (): kotlin.Int [fake_override] declared in kotlin.Int' type=kotlin.Int origin=null
@@ -79,7 +79,7 @@ FILE fqName:<root> fileName:/unaryOperators.kt
     FUN GENERATED_DATA_CLASS_MEMBER name:toString visibility:public modality:OPEN <> ($this:<root>.Result) 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>.Result
+      $this: VALUE_PARAMETER name:<this> type:<root>.Result
       BLOCK_BODY
         RETURN type=kotlin.Nothing from='public open fun toString (): kotlin.String declared in <root>.Result'
           STRING_CONCATENATION type=kotlin.String
diff --git a/compiler/testData/ir/irText/declarations/contextReceivers/unaryOperators.fir.kt.txt b/compiler/testData/ir/irText/declarations/contextReceivers/unaryOperators.fir.kt.txt
index baec71e984a..6cacc13fe2a 100644
--- a/compiler/testData/ir/irText/declarations/contextReceivers/unaryOperators.fir.kt.txt
+++ b/compiler/testData/ir/irText/declarations/contextReceivers/unaryOperators.fir.kt.txt
@@ -17,7 +17,7 @@ data class Result {
     return Result(i = i)
   }
 
-  override fun equals(other: Any?): Boolean {
+  override operator fun equals(other: Any?): Boolean {
     when {
       EQEQEQ(arg0 = <this>, arg1 = other) -> return true
     }
diff --git a/compiler/testData/ir/irText/declarations/inlineCollectionOfInlineClass.fir.ir.txt b/compiler/testData/ir/irText/declarations/inlineCollectionOfInlineClass.fir.ir.txt
index d46917c4316..76c1a8d1252 100644
--- a/compiler/testData/ir/irText/declarations/inlineCollectionOfInlineClass.fir.ir.txt
+++ b/compiler/testData/ir/irText/declarations/inlineCollectionOfInlineClass.fir.ir.txt
@@ -17,17 +17,17 @@ FILE fqName:<root> fileName:/inlineCollectionOfInlineClass.kt
           RETURN type=kotlin.Nothing from='public final fun <get-x> (): kotlin.Int declared in <root>.IT'
             GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:x type:kotlin.Int visibility:private [final]' type=kotlin.Int origin=null
               receiver: GET_VAR '<this>: <root>.IT declared in <root>.IT.<get-x>' type=<root>.IT origin=null
-    FUN GENERATED_SINGLE_FIELD_VALUE_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.IT, other:kotlin.Any?) returnType:kotlin.Boolean
+    FUN GENERATED_SINGLE_FIELD_VALUE_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.IT, 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 GENERATED_SINGLE_FIELD_VALUE_CLASS_MEMBER name:<this> type:<root>.IT
-      VALUE_PARAMETER GENERATED_SINGLE_FIELD_VALUE_CLASS_MEMBER name:other index:0 type:kotlin.Any?
+      $this: VALUE_PARAMETER name:<this> type:<root>.IT
+      VALUE_PARAMETER name:other index:0 type:kotlin.Any?
       BLOCK_BODY
         WHEN type=kotlin.Unit origin=null
           BRANCH
             if: TYPE_OP type=kotlin.Boolean origin=NOT_INSTANCEOF typeOperand=<root>.IT
               GET_VAR 'other: kotlin.Any? declared in <root>.IT.equals' type=kotlin.Any? origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.IT'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.IT'
               CONST Boolean type=kotlin.Boolean value=false
         VAR IR_TEMPORARY_VARIABLE name:tmp_0 type:<root>.IT [val]
           TYPE_OP type=<root>.IT origin=CAST typeOperand=<root>.IT
@@ -40,14 +40,14 @@ FILE fqName:<root> fileName:/inlineCollectionOfInlineClass.kt
                   receiver: GET_VAR '<this>: <root>.IT declared in <root>.IT.equals' type=<root>.IT origin=null
                 arg1: GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:x type:kotlin.Int visibility:private [final]' type=kotlin.Int origin=null
                   receiver: GET_VAR 'val tmp_0: <root>.IT [val] declared in <root>.IT.equals' type=<root>.IT origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.IT'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.IT'
               CONST Boolean type=kotlin.Boolean value=false
-        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.IT'
+        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.IT'
           CONST Boolean type=kotlin.Boolean value=true
     FUN GENERATED_SINGLE_FIELD_VALUE_CLASS_MEMBER name:hashCode visibility:public modality:OPEN <> ($this:<root>.IT) returnType:kotlin.Int
       overridden:
         public open fun hashCode (): kotlin.Int declared in kotlin.Any
-      $this: VALUE_PARAMETER GENERATED_SINGLE_FIELD_VALUE_CLASS_MEMBER name:<this> type:<root>.IT
+      $this: VALUE_PARAMETER name:<this> type:<root>.IT
       BLOCK_BODY
         RETURN type=kotlin.Nothing from='public open fun hashCode (): kotlin.Int declared in <root>.IT'
           CALL 'public open fun hashCode (): kotlin.Int [fake_override] declared in kotlin.Int' type=kotlin.Int origin=null
@@ -56,7 +56,7 @@ FILE fqName:<root> fileName:/inlineCollectionOfInlineClass.kt
     FUN GENERATED_SINGLE_FIELD_VALUE_CLASS_MEMBER name:toString visibility:public modality:OPEN <> ($this:<root>.IT) returnType:kotlin.String
       overridden:
         public open fun toString (): kotlin.String declared in kotlin.Any
-      $this: VALUE_PARAMETER GENERATED_SINGLE_FIELD_VALUE_CLASS_MEMBER name:<this> type:<root>.IT
+      $this: VALUE_PARAMETER name:<this> type:<root>.IT
       BLOCK_BODY
         RETURN type=kotlin.Nothing from='public open fun toString (): kotlin.String declared in <root>.IT'
           STRING_CONCATENATION type=kotlin.String
@@ -198,17 +198,17 @@ FILE fqName:<root> fileName:/inlineCollectionOfInlineClass.kt
             $this: CALL 'private final fun <get-ms> (): kotlin.collections.MutableSet<<root>.IT> declared in <root>.InlineMutableSet' type=kotlin.collections.MutableSet<<root>.IT> origin=GET_PROPERTY
               $this: GET_VAR '<this>: <root>.InlineMutableSet declared in <root>.InlineMutableSet.retainAll' type=<root>.InlineMutableSet origin=null
             elements: GET_VAR 'elements: kotlin.collections.Collection<<root>.IT> declared in <root>.InlineMutableSet.retainAll' type=kotlin.collections.Collection<<root>.IT> origin=null
-    FUN GENERATED_SINGLE_FIELD_VALUE_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.InlineMutableSet, other:kotlin.Any?) returnType:kotlin.Boolean
+    FUN GENERATED_SINGLE_FIELD_VALUE_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.InlineMutableSet, 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 GENERATED_SINGLE_FIELD_VALUE_CLASS_MEMBER name:<this> type:<root>.InlineMutableSet
-      VALUE_PARAMETER GENERATED_SINGLE_FIELD_VALUE_CLASS_MEMBER name:other index:0 type:kotlin.Any?
+      $this: VALUE_PARAMETER name:<this> type:<root>.InlineMutableSet
+      VALUE_PARAMETER name:other index:0 type:kotlin.Any?
       BLOCK_BODY
         WHEN type=kotlin.Unit origin=null
           BRANCH
             if: TYPE_OP type=kotlin.Boolean origin=NOT_INSTANCEOF typeOperand=<root>.InlineMutableSet
               GET_VAR 'other: kotlin.Any? declared in <root>.InlineMutableSet.equals' type=kotlin.Any? origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.InlineMutableSet'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.InlineMutableSet'
               CONST Boolean type=kotlin.Boolean value=false
         VAR IR_TEMPORARY_VARIABLE name:tmp_1 type:<root>.InlineMutableSet [val]
           TYPE_OP type=<root>.InlineMutableSet origin=CAST typeOperand=<root>.InlineMutableSet
@@ -221,14 +221,14 @@ FILE fqName:<root> fileName:/inlineCollectionOfInlineClass.kt
                   receiver: GET_VAR '<this>: <root>.InlineMutableSet declared in <root>.InlineMutableSet.equals' type=<root>.InlineMutableSet origin=null
                 arg1: GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:ms type:kotlin.collections.MutableSet<<root>.IT> visibility:private [final]' type=kotlin.collections.MutableSet<<root>.IT> origin=null
                   receiver: GET_VAR 'val tmp_1: <root>.InlineMutableSet [val] declared in <root>.InlineMutableSet.equals' type=<root>.InlineMutableSet origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.InlineMutableSet'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.InlineMutableSet'
               CONST Boolean type=kotlin.Boolean value=false
-        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.InlineMutableSet'
+        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.InlineMutableSet'
           CONST Boolean type=kotlin.Boolean value=true
     FUN GENERATED_SINGLE_FIELD_VALUE_CLASS_MEMBER name:hashCode visibility:public modality:OPEN <> ($this:<root>.InlineMutableSet) returnType:kotlin.Int
       overridden:
         public open fun hashCode (): kotlin.Int declared in kotlin.Any
-      $this: VALUE_PARAMETER GENERATED_SINGLE_FIELD_VALUE_CLASS_MEMBER name:<this> type:<root>.InlineMutableSet
+      $this: VALUE_PARAMETER name:<this> type:<root>.InlineMutableSet
       BLOCK_BODY
         RETURN type=kotlin.Nothing from='public open fun hashCode (): kotlin.Int declared in <root>.InlineMutableSet'
           CALL 'public open fun hashCode (): kotlin.Int [fake_override] declared in kotlin.collections.MutableSet' type=kotlin.Int origin=null
@@ -237,7 +237,7 @@ FILE fqName:<root> fileName:/inlineCollectionOfInlineClass.kt
     FUN GENERATED_SINGLE_FIELD_VALUE_CLASS_MEMBER name:toString visibility:public modality:OPEN <> ($this:<root>.InlineMutableSet) returnType:kotlin.String
       overridden:
         public open fun toString (): kotlin.String declared in kotlin.Any
-      $this: VALUE_PARAMETER GENERATED_SINGLE_FIELD_VALUE_CLASS_MEMBER name:<this> type:<root>.InlineMutableSet
+      $this: VALUE_PARAMETER name:<this> type:<root>.InlineMutableSet
       BLOCK_BODY
         RETURN type=kotlin.Nothing from='public open fun toString (): kotlin.String declared in <root>.InlineMutableSet'
           STRING_CONCATENATION type=kotlin.String
diff --git a/compiler/testData/ir/irText/declarations/inlineCollectionOfInlineClass.fir.kt.txt b/compiler/testData/ir/irText/declarations/inlineCollectionOfInlineClass.fir.kt.txt
index 4be294179ba..23d8ea8f7d6 100644
--- a/compiler/testData/ir/irText/declarations/inlineCollectionOfInlineClass.fir.kt.txt
+++ b/compiler/testData/ir/irText/declarations/inlineCollectionOfInlineClass.fir.kt.txt
@@ -9,7 +9,7 @@ value class IT {
     field = x
     get
 
-  override fun equals(other: Any?): Boolean {
+  override operator fun equals(other: Any?): Boolean {
     when {
       other !is IT -> return false
     }
@@ -86,7 +86,7 @@ value class InlineMutableSet : MutableSet<IT> {
     return <this>.<get-ms>().retainAll(elements = elements)
   }
 
-  override fun equals(other: Any?): Boolean {
+  override operator fun equals(other: Any?): Boolean {
     when {
       other !is InlineMutableSet -> return false
     }
diff --git a/compiler/testData/ir/irText/declarations/jvmRecord/dataClassWithJvmRecord.fir.ir.txt b/compiler/testData/ir/irText/declarations/jvmRecord/dataClassWithJvmRecord.fir.ir.txt
index fbc115e673c..e4c4cbb46fe 100644
--- a/compiler/testData/ir/irText/declarations/jvmRecord/dataClassWithJvmRecord.fir.ir.txt
+++ b/compiler/testData/ir/irText/declarations/jvmRecord/dataClassWithJvmRecord.fir.ir.txt
@@ -35,24 +35,24 @@ FILE fqName:<root> fileName:/dataClassWithJvmRecord.kt
         RETURN type=kotlin.Nothing from='public final fun copy (name: kotlin.String): <root>.MyRec declared in <root>.MyRec'
           CONSTRUCTOR_CALL 'public constructor <init> (name: kotlin.String) [primary] declared in <root>.MyRec' type=<root>.MyRec origin=null
             name: GET_VAR 'name: kotlin.String declared in <root>.MyRec.copy' type=kotlin.String origin=null
-    FUN GENERATED_DATA_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.MyRec, other:kotlin.Any?) returnType:kotlin.Boolean
+    FUN GENERATED_DATA_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.MyRec, 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 GENERATED_DATA_CLASS_MEMBER name:<this> type:<root>.MyRec
-      VALUE_PARAMETER GENERATED_DATA_CLASS_MEMBER name:other index:0 type:kotlin.Any?
+      $this: VALUE_PARAMETER name:<this> type:<root>.MyRec
+      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>.MyRec declared in <root>.MyRec.equals' type=<root>.MyRec origin=null
               arg1: GET_VAR 'other: kotlin.Any? declared in <root>.MyRec.equals' type=kotlin.Any? origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.MyRec'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.MyRec'
               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>.MyRec
               GET_VAR 'other: kotlin.Any? declared in <root>.MyRec.equals' type=kotlin.Any? origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.MyRec'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.MyRec'
               CONST Boolean type=kotlin.Boolean value=false
         VAR IR_TEMPORARY_VARIABLE name:tmp_0 type:<root>.MyRec [val]
           TYPE_OP type=<root>.MyRec origin=CAST typeOperand=<root>.MyRec
@@ -65,14 +65,14 @@ FILE fqName:<root> fileName:/dataClassWithJvmRecord.kt
                   receiver: GET_VAR '<this>: <root>.MyRec declared in <root>.MyRec.equals' type=<root>.MyRec origin=null
                 arg1: GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:name type:kotlin.String visibility:private [final]' type=kotlin.String origin=null
                   receiver: GET_VAR 'val tmp_0: <root>.MyRec [val] declared in <root>.MyRec.equals' type=<root>.MyRec origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.MyRec'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.MyRec'
               CONST Boolean type=kotlin.Boolean value=false
-        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.MyRec'
+        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.MyRec'
           CONST Boolean type=kotlin.Boolean value=true
     FUN GENERATED_DATA_CLASS_MEMBER name:hashCode visibility:public modality:OPEN <> ($this:<root>.MyRec) 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>.MyRec
+      $this: VALUE_PARAMETER name:<this> type:<root>.MyRec
       BLOCK_BODY
         RETURN type=kotlin.Nothing from='public open fun hashCode (): kotlin.Int declared in <root>.MyRec'
           CALL 'public open fun hashCode (): kotlin.Int [fake_override] declared in kotlin.String' type=kotlin.Int origin=null
@@ -81,7 +81,7 @@ FILE fqName:<root> fileName:/dataClassWithJvmRecord.kt
     FUN GENERATED_DATA_CLASS_MEMBER name:toString visibility:public modality:OPEN <> ($this:<root>.MyRec) 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>.MyRec
+      $this: VALUE_PARAMETER name:<this> type:<root>.MyRec
       BLOCK_BODY
         RETURN type=kotlin.Nothing from='public open fun toString (): kotlin.String declared in <root>.MyRec'
           STRING_CONCATENATION type=kotlin.String
diff --git a/compiler/testData/ir/irText/declarations/jvmRecord/dataClassWithJvmRecord.fir.kt.txt b/compiler/testData/ir/irText/declarations/jvmRecord/dataClassWithJvmRecord.fir.kt.txt
index 5abe36b5118..f264bbb25e7 100644
--- a/compiler/testData/ir/irText/declarations/jvmRecord/dataClassWithJvmRecord.fir.kt.txt
+++ b/compiler/testData/ir/irText/declarations/jvmRecord/dataClassWithJvmRecord.fir.kt.txt
@@ -18,7 +18,7 @@ data class MyRec : Record {
     return MyRec(name = name)
   }
 
-  override fun equals(other: Any?): Boolean {
+  override operator fun equals(other: Any?): Boolean {
     when {
       EQEQEQ(arg0 = <this>, arg1 = other) -> return true
     }
diff --git a/compiler/testData/ir/irText/declarations/kt52677.fir.ir.txt b/compiler/testData/ir/irText/declarations/kt52677.fir.ir.txt
index 3535b0a19dd..311cb909e28 100644
--- a/compiler/testData/ir/irText/declarations/kt52677.fir.ir.txt
+++ b/compiler/testData/ir/irText/declarations/kt52677.fir.ir.txt
@@ -67,24 +67,24 @@ FILE fqName:<root> fileName:/kt52677.kt
         RETURN type=kotlin.Nothing from='public final fun copy (id: @[MySerializable(c = ...)] <root>.Uuid1): <root>.LoginSuccessPacket declared in <root>.LoginSuccessPacket'
           CONSTRUCTOR_CALL 'public constructor <init> (id: @[MySerializable(c = ...)] <root>.Uuid1) [primary] declared in <root>.LoginSuccessPacket' type=<root>.LoginSuccessPacket origin=null
             id: GET_VAR 'id: @[MySerializable(c = ...)] <root>.Uuid1 declared in <root>.LoginSuccessPacket.copy' type=@[MySerializable(c = CLASS_REFERENCE 'CLASS OBJECT name:UuidSerializer modality:FINAL visibility:public superTypes:[<root>.MySerializer<@[MySerializable(c = ...)] <root>.Uuid1>]' type=kotlin.reflect.KClass<<root>.UuidSerializer>)] <root>.Uuid1 origin=null
-    FUN GENERATED_DATA_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.LoginSuccessPacket, other:kotlin.Any?) returnType:kotlin.Boolean
+    FUN GENERATED_DATA_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.LoginSuccessPacket, 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 GENERATED_DATA_CLASS_MEMBER name:<this> type:<root>.LoginSuccessPacket
-      VALUE_PARAMETER GENERATED_DATA_CLASS_MEMBER name:other index:0 type:kotlin.Any?
+      $this: VALUE_PARAMETER name:<this> type:<root>.LoginSuccessPacket
+      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>.LoginSuccessPacket declared in <root>.LoginSuccessPacket.equals' type=<root>.LoginSuccessPacket origin=null
               arg1: GET_VAR 'other: kotlin.Any? declared in <root>.LoginSuccessPacket.equals' type=kotlin.Any? origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.LoginSuccessPacket'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.LoginSuccessPacket'
               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>.LoginSuccessPacket
               GET_VAR 'other: kotlin.Any? declared in <root>.LoginSuccessPacket.equals' type=kotlin.Any? origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.LoginSuccessPacket'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.LoginSuccessPacket'
               CONST Boolean type=kotlin.Boolean value=false
         VAR IR_TEMPORARY_VARIABLE name:tmp_0 type:<root>.LoginSuccessPacket [val]
           TYPE_OP type=<root>.LoginSuccessPacket origin=CAST typeOperand=<root>.LoginSuccessPacket
@@ -97,14 +97,14 @@ FILE fqName:<root> fileName:/kt52677.kt
                   receiver: GET_VAR '<this>: <root>.LoginSuccessPacket declared in <root>.LoginSuccessPacket.equals' type=<root>.LoginSuccessPacket origin=null
                 arg1: GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:id type:@[MySerializable(c = ...)] <root>.Uuid1 visibility:private [final]' type=@[MySerializable(c = CLASS_REFERENCE 'CLASS OBJECT name:UuidSerializer modality:FINAL visibility:public superTypes:[<root>.MySerializer<@[MySerializable(c = ...)] <root>.Uuid1>]' type=kotlin.reflect.KClass<<root>.UuidSerializer>)] <root>.Uuid1 origin=null
                   receiver: GET_VAR 'val tmp_0: <root>.LoginSuccessPacket [val] declared in <root>.LoginSuccessPacket.equals' type=<root>.LoginSuccessPacket origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.LoginSuccessPacket'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.LoginSuccessPacket'
               CONST Boolean type=kotlin.Boolean value=false
-        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.LoginSuccessPacket'
+        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.LoginSuccessPacket'
           CONST Boolean type=kotlin.Boolean value=true
     FUN GENERATED_DATA_CLASS_MEMBER name:hashCode visibility:public modality:OPEN <> ($this:<root>.LoginSuccessPacket) 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>.LoginSuccessPacket
+      $this: VALUE_PARAMETER name:<this> type:<root>.LoginSuccessPacket
       BLOCK_BODY
         RETURN type=kotlin.Nothing from='public open fun hashCode (): kotlin.Int declared in <root>.LoginSuccessPacket'
           CALL 'public open fun hashCode (): kotlin.Int declared in kotlin.Any' type=kotlin.Int origin=null
@@ -113,7 +113,7 @@ FILE fqName:<root> fileName:/kt52677.kt
     FUN GENERATED_DATA_CLASS_MEMBER name:toString visibility:public modality:OPEN <> ($this:<root>.LoginSuccessPacket) 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>.LoginSuccessPacket
+      $this: VALUE_PARAMETER name:<this> type:<root>.LoginSuccessPacket
       BLOCK_BODY
         RETURN type=kotlin.Nothing from='public open fun toString (): kotlin.String declared in <root>.LoginSuccessPacket'
           STRING_CONCATENATION type=kotlin.String
diff --git a/compiler/testData/ir/irText/declarations/kt52677.fir.kt.txt b/compiler/testData/ir/irText/declarations/kt52677.fir.kt.txt
index e1b15331f39..56999cc67f6 100644
--- a/compiler/testData/ir/irText/declarations/kt52677.fir.kt.txt
+++ b/compiler/testData/ir/irText/declarations/kt52677.fir.kt.txt
@@ -32,7 +32,7 @@ data class LoginSuccessPacket {
     return LoginSuccessPacket(id = id)
   }
 
-  override fun equals(other: Any?): Boolean {
+  override operator fun equals(other: Any?): Boolean {
     when {
       EQEQEQ(arg0 = <this>, arg1 = other) -> return true
     }
diff --git a/compiler/testData/ir/irText/declarations/parameters/dataClassMembers.fir.ir.txt b/compiler/testData/ir/irText/declarations/parameters/dataClassMembers.fir.ir.txt
index 38ef438665b..7acbc0c4b8f 100644
--- a/compiler/testData/ir/irText/declarations/parameters/dataClassMembers.fir.ir.txt
+++ b/compiler/testData/ir/irText/declarations/parameters/dataClassMembers.fir.ir.txt
@@ -60,24 +60,24 @@ FILE fqName:<root> fileName:/dataClassMembers.kt
             <class: T>: kotlin.Any
             x: GET_VAR 'x: T of <root>.Test declared in <root>.Test.copy' type=T of <root>.Test origin=null
             y: GET_VAR 'y: kotlin.String declared in <root>.Test.copy' type=kotlin.String origin=null
-    FUN GENERATED_DATA_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.Test<T of <root>.Test>, other:kotlin.Any?) returnType:kotlin.Boolean
+    FUN GENERATED_DATA_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.Test<T of <root>.Test>, 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 GENERATED_DATA_CLASS_MEMBER name:<this> type:<root>.Test<T of <root>.Test>
-      VALUE_PARAMETER GENERATED_DATA_CLASS_MEMBER name:other index:0 type:kotlin.Any?
+      $this: VALUE_PARAMETER name:<this> type:<root>.Test<T of <root>.Test>
+      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>.Test<T of <root>.Test> declared in <root>.Test.equals' type=<root>.Test<T of <root>.Test> origin=null
               arg1: GET_VAR 'other: kotlin.Any? declared in <root>.Test.equals' type=kotlin.Any? origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Test'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Test'
               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>.Test<T of <root>.Test>
               GET_VAR 'other: kotlin.Any? declared in <root>.Test.equals' type=kotlin.Any? origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Test'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Test'
               CONST Boolean type=kotlin.Boolean value=false
         VAR IR_TEMPORARY_VARIABLE name:tmp_0 type:<root>.Test<T of <root>.Test> [val]
           TYPE_OP type=<root>.Test<T of <root>.Test> origin=CAST typeOperand=<root>.Test<T of <root>.Test>
@@ -90,7 +90,7 @@ FILE fqName:<root> fileName:/dataClassMembers.kt
                   receiver: GET_VAR '<this>: <root>.Test<T of <root>.Test> declared in <root>.Test.equals' type=<root>.Test<T of <root>.Test> origin=null
                 arg1: GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:x type:T of <root>.Test visibility:private [final]' type=T of <root>.Test origin=null
                   receiver: GET_VAR 'val tmp_0: <root>.Test<T of <root>.Test> [val] declared in <root>.Test.equals' type=<root>.Test<T of <root>.Test> origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Test'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Test'
               CONST Boolean type=kotlin.Boolean value=false
         WHEN type=kotlin.Unit origin=null
           BRANCH
@@ -100,14 +100,14 @@ FILE fqName:<root> fileName:/dataClassMembers.kt
                   receiver: GET_VAR '<this>: <root>.Test<T of <root>.Test> declared in <root>.Test.equals' type=<root>.Test<T of <root>.Test> origin=null
                 arg1: GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:y type:kotlin.String visibility:private [final]' type=kotlin.String origin=null
                   receiver: GET_VAR 'val tmp_0: <root>.Test<T of <root>.Test> [val] declared in <root>.Test.equals' type=<root>.Test<T of <root>.Test> origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Test'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Test'
               CONST Boolean type=kotlin.Boolean value=false
-        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Test'
+        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Test'
           CONST Boolean type=kotlin.Boolean value=true
     FUN GENERATED_DATA_CLASS_MEMBER name:hashCode visibility:public modality:OPEN <> ($this:<root>.Test<T of <root>.Test>) 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>.Test<T of <root>.Test>
+      $this: VALUE_PARAMETER name:<this> type:<root>.Test<T of <root>.Test>
       BLOCK_BODY
         VAR name:result type:kotlin.Int [var]
           WHEN type=kotlin.Int origin=null
@@ -135,7 +135,7 @@ FILE fqName:<root> fileName:/dataClassMembers.kt
     FUN GENERATED_DATA_CLASS_MEMBER name:toString visibility:public modality:OPEN <> ($this:<root>.Test<T of <root>.Test>) 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>.Test<T of <root>.Test>
+      $this: VALUE_PARAMETER name:<this> type:<root>.Test<T of <root>.Test>
       BLOCK_BODY
         RETURN type=kotlin.Nothing from='public open fun toString (): kotlin.String declared in <root>.Test'
           STRING_CONCATENATION type=kotlin.String
diff --git a/compiler/testData/ir/irText/declarations/parameters/dataClassMembers.fir.kt.txt b/compiler/testData/ir/irText/declarations/parameters/dataClassMembers.fir.kt.txt
index eecc6bc846f..d82d037ae6a 100644
--- a/compiler/testData/ir/irText/declarations/parameters/dataClassMembers.fir.kt.txt
+++ b/compiler/testData/ir/irText/declarations/parameters/dataClassMembers.fir.kt.txt
@@ -25,7 +25,7 @@ data class Test<T : Any?> {
     return Test<Any>(x = x, y = y)
   }
 
-  override fun equals(other: Any?): Boolean {
+  override operator fun equals(other: Any?): Boolean {
     when {
       EQEQEQ(arg0 = <this>, arg1 = other) -> return true
     }
diff --git a/compiler/testData/ir/irText/firProblems/ArrayMap.fir.ir.txt b/compiler/testData/ir/irText/firProblems/ArrayMap.fir.ir.txt
index fff514ce870..4ebd40f4b93 100644
--- a/compiler/testData/ir/irText/firProblems/ArrayMap.fir.ir.txt
+++ b/compiler/testData/ir/irText/firProblems/ArrayMap.fir.ir.txt
@@ -745,24 +745,24 @@ FILE fqName:<root> fileName:/ArrayMap.kt
               <class: T>: kotlin.Any
               key: GET_VAR 'key: kotlin.Int declared in <root>.ArrayMapImpl.Entry.copy' type=kotlin.Int origin=null
               value: GET_VAR 'value: T of <root>.ArrayMapImpl.Entry declared in <root>.ArrayMapImpl.Entry.copy' type=T of <root>.ArrayMapImpl.Entry origin=null
-      FUN GENERATED_DATA_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.ArrayMapImpl.Entry<T of <root>.ArrayMapImpl.Entry>, other:kotlin.Any?) returnType:kotlin.Boolean
+      FUN GENERATED_DATA_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.ArrayMapImpl.Entry<T of <root>.ArrayMapImpl.Entry>, 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 GENERATED_DATA_CLASS_MEMBER name:<this> type:<root>.ArrayMapImpl.Entry<T of <root>.ArrayMapImpl.Entry>
-        VALUE_PARAMETER GENERATED_DATA_CLASS_MEMBER name:other index:0 type:kotlin.Any?
+        $this: VALUE_PARAMETER name:<this> type:<root>.ArrayMapImpl.Entry<T of <root>.ArrayMapImpl.Entry>
+        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>.ArrayMapImpl.Entry<T of <root>.ArrayMapImpl.Entry> declared in <root>.ArrayMapImpl.Entry.equals' type=<root>.ArrayMapImpl.Entry<T of <root>.ArrayMapImpl.Entry> origin=null
                 arg1: GET_VAR 'other: kotlin.Any? declared in <root>.ArrayMapImpl.Entry.equals' type=kotlin.Any? origin=null
-              then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.ArrayMapImpl.Entry'
+              then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.ArrayMapImpl.Entry'
                 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>.ArrayMapImpl.Entry<T of <root>.ArrayMapImpl.Entry>
                 GET_VAR 'other: kotlin.Any? declared in <root>.ArrayMapImpl.Entry.equals' type=kotlin.Any? origin=null
-              then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.ArrayMapImpl.Entry'
+              then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.ArrayMapImpl.Entry'
                 CONST Boolean type=kotlin.Boolean value=false
           VAR IR_TEMPORARY_VARIABLE name:tmp_3 type:<root>.ArrayMapImpl.Entry<T of <root>.ArrayMapImpl.Entry> [val]
             TYPE_OP type=<root>.ArrayMapImpl.Entry<T of <root>.ArrayMapImpl.Entry> origin=CAST typeOperand=<root>.ArrayMapImpl.Entry<T of <root>.ArrayMapImpl.Entry>
@@ -775,7 +775,7 @@ FILE fqName:<root> fileName:/ArrayMap.kt
                     receiver: GET_VAR '<this>: <root>.ArrayMapImpl.Entry<T of <root>.ArrayMapImpl.Entry> declared in <root>.ArrayMapImpl.Entry.equals' type=<root>.ArrayMapImpl.Entry<T of <root>.ArrayMapImpl.Entry> origin=null
                   arg1: GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:key type:kotlin.Int visibility:private [final]' type=kotlin.Int origin=null
                     receiver: GET_VAR 'val tmp_3: <root>.ArrayMapImpl.Entry<T of <root>.ArrayMapImpl.Entry> [val] declared in <root>.ArrayMapImpl.Entry.equals' type=<root>.ArrayMapImpl.Entry<T of <root>.ArrayMapImpl.Entry> origin=null
-              then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.ArrayMapImpl.Entry'
+              then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.ArrayMapImpl.Entry'
                 CONST Boolean type=kotlin.Boolean value=false
           WHEN type=kotlin.Unit origin=null
             BRANCH
@@ -785,14 +785,14 @@ FILE fqName:<root> fileName:/ArrayMap.kt
                     receiver: GET_VAR '<this>: <root>.ArrayMapImpl.Entry<T of <root>.ArrayMapImpl.Entry> declared in <root>.ArrayMapImpl.Entry.equals' type=<root>.ArrayMapImpl.Entry<T of <root>.ArrayMapImpl.Entry> origin=null
                   arg1: GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:value type:T of <root>.ArrayMapImpl.Entry visibility:private [final]' type=T of <root>.ArrayMapImpl.Entry origin=null
                     receiver: GET_VAR 'val tmp_3: <root>.ArrayMapImpl.Entry<T of <root>.ArrayMapImpl.Entry> [val] declared in <root>.ArrayMapImpl.Entry.equals' type=<root>.ArrayMapImpl.Entry<T of <root>.ArrayMapImpl.Entry> origin=null
-              then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.ArrayMapImpl.Entry'
+              then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.ArrayMapImpl.Entry'
                 CONST Boolean type=kotlin.Boolean value=false
-          RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.ArrayMapImpl.Entry'
+          RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.ArrayMapImpl.Entry'
             CONST Boolean type=kotlin.Boolean value=true
       FUN GENERATED_DATA_CLASS_MEMBER name:hashCode visibility:public modality:OPEN <> ($this:<root>.ArrayMapImpl.Entry<T of <root>.ArrayMapImpl.Entry>) 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>.ArrayMapImpl.Entry<T of <root>.ArrayMapImpl.Entry>
+        $this: VALUE_PARAMETER name:<this> type:<root>.ArrayMapImpl.Entry<T of <root>.ArrayMapImpl.Entry>
         BLOCK_BODY
           VAR name:result type:kotlin.Int [var]
             CALL 'public open fun hashCode (): kotlin.Int [fake_override] declared in kotlin.Int' type=kotlin.Int origin=null
@@ -820,7 +820,7 @@ FILE fqName:<root> fileName:/ArrayMap.kt
       FUN GENERATED_DATA_CLASS_MEMBER name:toString visibility:public modality:OPEN <> ($this:<root>.ArrayMapImpl.Entry<T of <root>.ArrayMapImpl.Entry>) 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>.ArrayMapImpl.Entry<T of <root>.ArrayMapImpl.Entry>
+        $this: VALUE_PARAMETER name:<this> type:<root>.ArrayMapImpl.Entry<T of <root>.ArrayMapImpl.Entry>
         BLOCK_BODY
           RETURN type=kotlin.Nothing from='public open fun toString (): kotlin.String declared in <root>.ArrayMapImpl.Entry'
             STRING_CONCATENATION type=kotlin.String
diff --git a/compiler/testData/ir/irText/firProblems/ArrayMap.fir.kt.txt b/compiler/testData/ir/irText/firProblems/ArrayMap.fir.kt.txt
index 61fa33bc1c2..bafc8202fab 100644
--- a/compiler/testData/ir/irText/firProblems/ArrayMap.fir.kt.txt
+++ b/compiler/testData/ir/irText/firProblems/ArrayMap.fir.kt.txt
@@ -295,7 +295,7 @@ internal class ArrayMapImpl<T : Any> : ArrayMap<T> {
       return Entry<Any>(key = key, value = value)
     }
 
-    override fun equals(other: Any?): Boolean {
+    override operator fun equals(other: Any?): Boolean {
       when {
         EQEQEQ(arg0 = <this>, arg1 = other) -> return true
       }
diff --git a/compiler/testData/ir/irText/firProblems/MultiList.fir.ir.txt b/compiler/testData/ir/irText/firProblems/MultiList.fir.ir.txt
index 46e68cfa75f..05177aa9bb7 100644
--- a/compiler/testData/ir/irText/firProblems/MultiList.fir.ir.txt
+++ b/compiler/testData/ir/irText/firProblems/MultiList.fir.ir.txt
@@ -35,24 +35,24 @@ FILE fqName:<root> fileName:/MultiList.kt
           CONSTRUCTOR_CALL 'public constructor <init> (value: T of <root>.Some) [primary] declared in <root>.Some' type=<root>.Some<T of <root>.Some> origin=null
             <class: T>: kotlin.Any
             value: GET_VAR 'value: T of <root>.Some declared in <root>.Some.copy' type=T of <root>.Some origin=null
-    FUN GENERATED_DATA_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.Some<T of <root>.Some>, other:kotlin.Any?) returnType:kotlin.Boolean
+    FUN GENERATED_DATA_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.Some<T of <root>.Some>, 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 GENERATED_DATA_CLASS_MEMBER name:<this> type:<root>.Some<T of <root>.Some>
-      VALUE_PARAMETER GENERATED_DATA_CLASS_MEMBER name:other index:0 type:kotlin.Any?
+      $this: VALUE_PARAMETER name:<this> type:<root>.Some<T of <root>.Some>
+      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>.Some<T of <root>.Some> declared in <root>.Some.equals' type=<root>.Some<T of <root>.Some> origin=null
               arg1: GET_VAR 'other: kotlin.Any? declared in <root>.Some.equals' type=kotlin.Any? origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Some'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Some'
               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>.Some<T of <root>.Some>
               GET_VAR 'other: kotlin.Any? declared in <root>.Some.equals' type=kotlin.Any? origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Some'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Some'
               CONST Boolean type=kotlin.Boolean value=false
         VAR IR_TEMPORARY_VARIABLE name:tmp_0 type:<root>.Some<T of <root>.Some> [val]
           TYPE_OP type=<root>.Some<T of <root>.Some> origin=CAST typeOperand=<root>.Some<T of <root>.Some>
@@ -65,14 +65,14 @@ FILE fqName:<root> fileName:/MultiList.kt
                   receiver: GET_VAR '<this>: <root>.Some<T of <root>.Some> declared in <root>.Some.equals' type=<root>.Some<T of <root>.Some> origin=null
                 arg1: GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:value type:T of <root>.Some visibility:private [final]' type=T of <root>.Some origin=null
                   receiver: GET_VAR 'val tmp_0: <root>.Some<T of <root>.Some> [val] declared in <root>.Some.equals' type=<root>.Some<T of <root>.Some> origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Some'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Some'
               CONST Boolean type=kotlin.Boolean value=false
-        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Some'
+        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Some'
           CONST Boolean type=kotlin.Boolean value=true
     FUN GENERATED_DATA_CLASS_MEMBER name:hashCode visibility:public modality:OPEN <> ($this:<root>.Some<T of <root>.Some>) 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>.Some<T of <root>.Some>
+      $this: VALUE_PARAMETER name:<this> type:<root>.Some<T of <root>.Some>
       BLOCK_BODY
         RETURN type=kotlin.Nothing from='public open fun hashCode (): kotlin.Int declared in <root>.Some'
           WHEN type=kotlin.Int origin=null
@@ -90,7 +90,7 @@ FILE fqName:<root> fileName:/MultiList.kt
     FUN GENERATED_DATA_CLASS_MEMBER name:toString visibility:public modality:OPEN <> ($this:<root>.Some<T of <root>.Some>) 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>.Some<T of <root>.Some>
+      $this: VALUE_PARAMETER name:<this> type:<root>.Some<T of <root>.Some>
       BLOCK_BODY
         RETURN type=kotlin.Nothing from='public open fun toString (): kotlin.String declared in <root>.Some'
           STRING_CONCATENATION type=kotlin.String
diff --git a/compiler/testData/ir/irText/firProblems/MultiList.fir.kt.txt b/compiler/testData/ir/irText/firProblems/MultiList.fir.kt.txt
index 86418c2ccfc..1b76c1ca2a8 100644
--- a/compiler/testData/ir/irText/firProblems/MultiList.fir.kt.txt
+++ b/compiler/testData/ir/irText/firProblems/MultiList.fir.kt.txt
@@ -17,7 +17,7 @@ data class Some<T : Any?> {
     return Some<Any>(value = value)
   }
 
-  override fun equals(other: Any?): Boolean {
+  override operator fun equals(other: Any?): Boolean {
     when {
       EQEQEQ(arg0 = <this>, arg1 = other) -> return true
     }
diff --git a/compiler/testData/ir/irText/firProblems/SignatureClash.fir.ir.txt b/compiler/testData/ir/irText/firProblems/SignatureClash.fir.ir.txt
index 5251566f1c2..acc18dec7d7 100644
--- a/compiler/testData/ir/irText/firProblems/SignatureClash.fir.ir.txt
+++ b/compiler/testData/ir/irText/firProblems/SignatureClash.fir.ir.txt
@@ -126,24 +126,24 @@ FILE fqName:<root> fileName:/SignatureClash.kt
         RETURN type=kotlin.Nothing from='public final fun copy (delegate: <root>.Delegate): <root>.DataClass declared in <root>.DataClass'
           CONSTRUCTOR_CALL 'public constructor <init> (delegate: <root>.Delegate) [primary] declared in <root>.DataClass' type=<root>.DataClass origin=null
             delegate: GET_VAR 'delegate: <root>.Delegate declared in <root>.DataClass.copy' type=<root>.Delegate origin=null
-    FUN GENERATED_DATA_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.DataClass, other:kotlin.Any?) returnType:kotlin.Boolean
+    FUN GENERATED_DATA_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.DataClass, 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 GENERATED_DATA_CLASS_MEMBER name:<this> type:<root>.DataClass
-      VALUE_PARAMETER GENERATED_DATA_CLASS_MEMBER name:other index:0 type:kotlin.Any?
+      $this: VALUE_PARAMETER name:<this> type:<root>.DataClass
+      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>.DataClass declared in <root>.DataClass.equals' type=<root>.DataClass origin=null
               arg1: GET_VAR 'other: kotlin.Any? declared in <root>.DataClass.equals' type=kotlin.Any? origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.DataClass'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.DataClass'
               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>.DataClass
               GET_VAR 'other: kotlin.Any? declared in <root>.DataClass.equals' type=kotlin.Any? origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.DataClass'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.DataClass'
               CONST Boolean type=kotlin.Boolean value=false
         VAR IR_TEMPORARY_VARIABLE name:tmp_0 type:<root>.DataClass [val]
           TYPE_OP type=<root>.DataClass origin=CAST typeOperand=<root>.DataClass
@@ -156,14 +156,14 @@ FILE fqName:<root> fileName:/SignatureClash.kt
                   receiver: GET_VAR '<this>: <root>.DataClass declared in <root>.DataClass.equals' type=<root>.DataClass origin=null
                 arg1: GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:delegate type:<root>.Delegate visibility:private [final]' type=<root>.Delegate origin=null
                   receiver: GET_VAR 'val tmp_0: <root>.DataClass [val] declared in <root>.DataClass.equals' type=<root>.DataClass origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.DataClass'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.DataClass'
               CONST Boolean type=kotlin.Boolean value=false
-        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.DataClass'
+        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.DataClass'
           CONST Boolean type=kotlin.Boolean value=true
     FUN GENERATED_DATA_CLASS_MEMBER name:hashCode visibility:public modality:OPEN <> ($this:<root>.DataClass) 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>.DataClass
+      $this: VALUE_PARAMETER name:<this> type:<root>.DataClass
       BLOCK_BODY
         RETURN type=kotlin.Nothing from='public open fun hashCode (): kotlin.Int declared in <root>.DataClass'
           CALL 'public open fun hashCode (): kotlin.Int [fake_override] declared in <root>.Delegate' type=kotlin.Int origin=null
@@ -172,7 +172,7 @@ FILE fqName:<root> fileName:/SignatureClash.kt
     FUN GENERATED_DATA_CLASS_MEMBER name:toString visibility:public modality:OPEN <> ($this:<root>.DataClass) 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>.DataClass
+      $this: VALUE_PARAMETER name:<this> type:<root>.DataClass
       BLOCK_BODY
         RETURN type=kotlin.Nothing from='public open fun toString (): kotlin.String declared in <root>.DataClass'
           STRING_CONCATENATION type=kotlin.String
diff --git a/compiler/testData/ir/irText/firProblems/SignatureClash.fir.kt.txt b/compiler/testData/ir/irText/firProblems/SignatureClash.fir.kt.txt
index ffc773c9e45..7c962bdc230 100644
--- a/compiler/testData/ir/irText/firProblems/SignatureClash.fir.kt.txt
+++ b/compiler/testData/ir/irText/firProblems/SignatureClash.fir.kt.txt
@@ -52,7 +52,7 @@ data class DataClass : Derived, Delegate {
     return DataClass(delegate = delegate)
   }
 
-  override fun equals(other: Any?): Boolean {
+  override operator fun equals(other: Any?): Boolean {
     when {
       EQEQEQ(arg0 = <this>, arg1 = other) -> return true
     }
diff --git a/compiler/testData/ir/irText/firProblems/dataObject.fir.ir.txt b/compiler/testData/ir/irText/firProblems/dataObject.fir.ir.txt
index dfb8e9f9ac7..18fda30f454 100644
--- a/compiler/testData/ir/irText/firProblems/dataObject.fir.ir.txt
+++ b/compiler/testData/ir/irText/firProblems/dataObject.fir.ir.txt
@@ -5,41 +5,41 @@ FILE fqName:<root> fileName:/dataObject.kt
       BLOCK_BODY
         DELEGATING_CONSTRUCTOR_CALL 'public constructor <init> () [primary] declared in kotlin.Any'
         INSTANCE_INITIALIZER_CALL classDescriptor='CLASS OBJECT name:DataObject modality:FINAL visibility:public [data] superTypes:[kotlin.Any]'
-    FUN GENERATED_DATA_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.DataObject, other:kotlin.Any?) returnType:kotlin.Boolean
+    FUN GENERATED_DATA_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.DataObject, 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 GENERATED_DATA_CLASS_MEMBER name:<this> type:<root>.DataObject
-      VALUE_PARAMETER GENERATED_DATA_CLASS_MEMBER name:other index:0 type:kotlin.Any?
+      $this: VALUE_PARAMETER name:<this> type:<root>.DataObject
+      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>.DataObject declared in <root>.DataObject.equals' type=<root>.DataObject origin=null
               arg1: GET_VAR 'other: kotlin.Any? declared in <root>.DataObject.equals' type=kotlin.Any? origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.DataObject'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.DataObject'
               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>.DataObject
               GET_VAR 'other: kotlin.Any? declared in <root>.DataObject.equals' type=kotlin.Any? origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.DataObject'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.DataObject'
               CONST Boolean type=kotlin.Boolean value=false
         VAR IR_TEMPORARY_VARIABLE name:tmp_0 type:<root>.DataObject [val]
           TYPE_OP type=<root>.DataObject origin=CAST typeOperand=<root>.DataObject
             GET_VAR 'other: kotlin.Any? declared in <root>.DataObject.equals' type=kotlin.Any? origin=null
-        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.DataObject'
+        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.DataObject'
           CONST Boolean type=kotlin.Boolean value=true
     FUN GENERATED_DATA_CLASS_MEMBER name:hashCode visibility:public modality:OPEN <> ($this:<root>.DataObject) 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>.DataObject
+      $this: VALUE_PARAMETER name:<this> type:<root>.DataObject
       BLOCK_BODY
         RETURN type=kotlin.Nothing from='public open fun hashCode (): kotlin.Int declared in <root>.DataObject'
           CONST Int type=kotlin.Int value=-1155894359
     FUN GENERATED_DATA_CLASS_MEMBER name:toString visibility:public modality:OPEN <> ($this:<root>.DataObject) 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>.DataObject
+      $this: VALUE_PARAMETER name:<this> type:<root>.DataObject
       BLOCK_BODY
         RETURN type=kotlin.Nothing from='public open fun toString (): kotlin.String declared in <root>.DataObject'
           CONST String type=kotlin.String value="DataObject"
diff --git a/compiler/testData/ir/irText/firProblems/dataObject.fir.kt.txt b/compiler/testData/ir/irText/firProblems/dataObject.fir.kt.txt
index 6510ed17a67..72ea1dcf206 100644
--- a/compiler/testData/ir/irText/firProblems/dataObject.fir.kt.txt
+++ b/compiler/testData/ir/irText/firProblems/dataObject.fir.kt.txt
@@ -5,7 +5,7 @@ data object DataObject {
 
   }
 
-  override fun equals(other: Any?): Boolean {
+  override operator fun equals(other: Any?): Boolean {
     when {
       EQEQEQ(arg0 = <this>, arg1 = other) -> return true
     }
diff --git a/compiler/testData/ir/irText/firProblems/valueClassEquals.fir.ir.txt b/compiler/testData/ir/irText/firProblems/valueClassEquals.fir.ir.txt
index bcfeb8a1ca2..3a8bc95487c 100644
--- a/compiler/testData/ir/irText/firProblems/valueClassEquals.fir.ir.txt
+++ b/compiler/testData/ir/irText/firProblems/valueClassEquals.fir.ir.txt
@@ -19,17 +19,17 @@ FILE fqName:<root> fileName:/valueClassEquals.kt
           RETURN type=kotlin.Nothing from='public final fun <get-s> (): kotlin.String declared in <root>.Z'
             GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:s type:kotlin.String visibility:private [final]' type=kotlin.String origin=null
               receiver: GET_VAR '<this>: <root>.Z declared in <root>.Z.<get-s>' type=<root>.Z origin=null
-    FUN GENERATED_SINGLE_FIELD_VALUE_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.Z, other:kotlin.Any?) returnType:kotlin.Boolean
+    FUN GENERATED_SINGLE_FIELD_VALUE_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.Z, 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 GENERATED_SINGLE_FIELD_VALUE_CLASS_MEMBER name:<this> type:<root>.Z
-      VALUE_PARAMETER GENERATED_SINGLE_FIELD_VALUE_CLASS_MEMBER name:other index:0 type:kotlin.Any?
+      $this: VALUE_PARAMETER name:<this> type:<root>.Z
+      VALUE_PARAMETER name:other index:0 type:kotlin.Any?
       BLOCK_BODY
         WHEN type=kotlin.Unit origin=null
           BRANCH
             if: TYPE_OP type=kotlin.Boolean origin=NOT_INSTANCEOF typeOperand=<root>.Z
               GET_VAR 'other: kotlin.Any? declared in <root>.Z.equals' type=kotlin.Any? origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Z'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Z'
               CONST Boolean type=kotlin.Boolean value=false
         VAR IR_TEMPORARY_VARIABLE name:tmp_0 type:<root>.Z [val]
           TYPE_OP type=<root>.Z origin=CAST typeOperand=<root>.Z
@@ -42,14 +42,14 @@ FILE fqName:<root> fileName:/valueClassEquals.kt
                   receiver: GET_VAR '<this>: <root>.Z declared in <root>.Z.equals' type=<root>.Z origin=null
                 arg1: GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:s type:kotlin.String visibility:private [final]' type=kotlin.String origin=null
                   receiver: GET_VAR 'val tmp_0: <root>.Z [val] declared in <root>.Z.equals' type=<root>.Z origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Z'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Z'
               CONST Boolean type=kotlin.Boolean value=false
-        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Z'
+        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Z'
           CONST Boolean type=kotlin.Boolean value=true
     FUN GENERATED_SINGLE_FIELD_VALUE_CLASS_MEMBER name:hashCode visibility:public modality:OPEN <> ($this:<root>.Z) returnType:kotlin.Int
       overridden:
         public open fun hashCode (): kotlin.Int declared in kotlin.Any
-      $this: VALUE_PARAMETER GENERATED_SINGLE_FIELD_VALUE_CLASS_MEMBER name:<this> type:<root>.Z
+      $this: VALUE_PARAMETER name:<this> type:<root>.Z
       BLOCK_BODY
         RETURN type=kotlin.Nothing from='public open fun hashCode (): kotlin.Int declared in <root>.Z'
           CALL 'public open fun hashCode (): kotlin.Int [fake_override] declared in kotlin.String' type=kotlin.Int origin=null
@@ -58,7 +58,7 @@ FILE fqName:<root> fileName:/valueClassEquals.kt
     FUN GENERATED_SINGLE_FIELD_VALUE_CLASS_MEMBER name:toString visibility:public modality:OPEN <> ($this:<root>.Z) returnType:kotlin.String
       overridden:
         public open fun toString (): kotlin.String declared in kotlin.Any
-      $this: VALUE_PARAMETER GENERATED_SINGLE_FIELD_VALUE_CLASS_MEMBER name:<this> type:<root>.Z
+      $this: VALUE_PARAMETER name:<this> type:<root>.Z
       BLOCK_BODY
         RETURN type=kotlin.Nothing from='public open fun toString (): kotlin.String declared in <root>.Z'
           STRING_CONCATENATION type=kotlin.String
diff --git a/compiler/testData/ir/irText/firProblems/valueClassEquals.fir.kt.txt b/compiler/testData/ir/irText/firProblems/valueClassEquals.fir.kt.txt
index 1f91b469a53..4224114cef2 100644
--- a/compiler/testData/ir/irText/firProblems/valueClassEquals.fir.kt.txt
+++ b/compiler/testData/ir/irText/firProblems/valueClassEquals.fir.kt.txt
@@ -10,7 +10,7 @@ value class Z {
     field = s
     get
 
-  override fun equals(other: Any?): Boolean {
+  override operator fun equals(other: Any?): Boolean {
     when {
       other !is Z -> return false
     }
diff --git a/compiler/testData/ir/irText/lambdas/destructuringInLambda.fir.ir.txt b/compiler/testData/ir/irText/lambdas/destructuringInLambda.fir.ir.txt
index 83d304d42a0..868faa79784 100644
--- a/compiler/testData/ir/irText/lambdas/destructuringInLambda.fir.ir.txt
+++ b/compiler/testData/ir/irText/lambdas/destructuringInLambda.fir.ir.txt
@@ -56,24 +56,24 @@ FILE fqName:<root> fileName:/destructuringInLambda.kt
           CONSTRUCTOR_CALL 'public constructor <init> (x: kotlin.Int, y: kotlin.Int) [primary] declared in <root>.A' type=<root>.A origin=null
             x: GET_VAR 'x: kotlin.Int declared in <root>.A.copy' type=kotlin.Int origin=null
             y: GET_VAR 'y: kotlin.Int declared in <root>.A.copy' type=kotlin.Int origin=null
-    FUN GENERATED_DATA_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.A, other:kotlin.Any?) returnType:kotlin.Boolean
+    FUN GENERATED_DATA_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.A, 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 GENERATED_DATA_CLASS_MEMBER name:<this> type:<root>.A
-      VALUE_PARAMETER GENERATED_DATA_CLASS_MEMBER name:other index:0 type:kotlin.Any?
+      $this: VALUE_PARAMETER name:<this> type:<root>.A
+      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>.A declared in <root>.A.equals' type=<root>.A origin=null
               arg1: GET_VAR 'other: kotlin.Any? declared in <root>.A.equals' type=kotlin.Any? origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.A'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.A'
               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>.A
               GET_VAR 'other: kotlin.Any? declared in <root>.A.equals' type=kotlin.Any? origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.A'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.A'
               CONST Boolean type=kotlin.Boolean value=false
         VAR IR_TEMPORARY_VARIABLE name:tmp_0 type:<root>.A [val]
           TYPE_OP type=<root>.A origin=CAST typeOperand=<root>.A
@@ -86,7 +86,7 @@ FILE fqName:<root> fileName:/destructuringInLambda.kt
                   receiver: GET_VAR '<this>: <root>.A declared in <root>.A.equals' type=<root>.A origin=null
                 arg1: GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:x type:kotlin.Int visibility:private [final]' type=kotlin.Int origin=null
                   receiver: GET_VAR 'val tmp_0: <root>.A [val] declared in <root>.A.equals' type=<root>.A origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.A'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.A'
               CONST Boolean type=kotlin.Boolean value=false
         WHEN type=kotlin.Unit origin=null
           BRANCH
@@ -96,14 +96,14 @@ FILE fqName:<root> fileName:/destructuringInLambda.kt
                   receiver: GET_VAR '<this>: <root>.A declared in <root>.A.equals' type=<root>.A origin=null
                 arg1: GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:y type:kotlin.Int visibility:private [final]' type=kotlin.Int origin=null
                   receiver: GET_VAR 'val tmp_0: <root>.A [val] declared in <root>.A.equals' type=<root>.A origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.A'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.A'
               CONST Boolean type=kotlin.Boolean value=false
-        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.A'
+        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.A'
           CONST Boolean type=kotlin.Boolean value=true
     FUN GENERATED_DATA_CLASS_MEMBER name:hashCode visibility:public modality:OPEN <> ($this:<root>.A) 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>.A
+      $this: VALUE_PARAMETER name:<this> type:<root>.A
       BLOCK_BODY
         VAR name:result type:kotlin.Int [var]
           CALL 'public open fun hashCode (): kotlin.Int [fake_override] declared in kotlin.Int' type=kotlin.Int origin=null
@@ -122,7 +122,7 @@ FILE fqName:<root> fileName:/destructuringInLambda.kt
     FUN GENERATED_DATA_CLASS_MEMBER name:toString visibility:public modality:OPEN <> ($this:<root>.A) 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>.A
+      $this: VALUE_PARAMETER name:<this> type:<root>.A
       BLOCK_BODY
         RETURN type=kotlin.Nothing from='public open fun toString (): kotlin.String declared in <root>.A'
           STRING_CONCATENATION type=kotlin.String
diff --git a/compiler/testData/ir/irText/lambdas/destructuringInLambda.fir.kt.txt b/compiler/testData/ir/irText/lambdas/destructuringInLambda.fir.kt.txt
index e9195d28e4b..a2b582f8324 100644
--- a/compiler/testData/ir/irText/lambdas/destructuringInLambda.fir.kt.txt
+++ b/compiler/testData/ir/irText/lambdas/destructuringInLambda.fir.kt.txt
@@ -25,7 +25,7 @@ data class A {
     return A(x = x, y = y)
   }
 
-  override fun equals(other: Any?): Boolean {
+  override operator fun equals(other: Any?): Boolean {
     when {
       EQEQEQ(arg0 = <this>, arg1 = other) -> return true
     }
diff --git a/compiler/testData/ir/irText/regressions/kt45236.fir.ir.txt b/compiler/testData/ir/irText/regressions/kt45236.fir.ir.txt
index b8c08db712d..431a04ad5fe 100644
--- a/compiler/testData/ir/irText/regressions/kt45236.fir.ir.txt
+++ b/compiler/testData/ir/irText/regressions/kt45236.fir.ir.txt
@@ -78,24 +78,24 @@ FILE fqName:<root> fileName:/kt45236.kt
               <class: T>: kotlin.Any
               error: GET_VAR 'error: kotlin.Throwable declared in <root>.NetRequestStatus.Error.copy' type=kotlin.Throwable origin=null
               value: GET_VAR 'value: T of <root>.NetRequestStatus.Error? declared in <root>.NetRequestStatus.Error.copy' type=T of <root>.NetRequestStatus.Error? origin=null
-      FUN GENERATED_DATA_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.NetRequestStatus.Error<T of <root>.NetRequestStatus.Error>, other:kotlin.Any?) returnType:kotlin.Boolean
+      FUN GENERATED_DATA_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.NetRequestStatus.Error<T of <root>.NetRequestStatus.Error>, 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 GENERATED_DATA_CLASS_MEMBER name:<this> type:<root>.NetRequestStatus.Error<T of <root>.NetRequestStatus.Error>
-        VALUE_PARAMETER GENERATED_DATA_CLASS_MEMBER name:other index:0 type:kotlin.Any?
+        $this: VALUE_PARAMETER name:<this> type:<root>.NetRequestStatus.Error<T of <root>.NetRequestStatus.Error>
+        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>.NetRequestStatus.Error<T of <root>.NetRequestStatus.Error> declared in <root>.NetRequestStatus.Error.equals' type=<root>.NetRequestStatus.Error<T of <root>.NetRequestStatus.Error> origin=null
                 arg1: GET_VAR 'other: kotlin.Any? declared in <root>.NetRequestStatus.Error.equals' type=kotlin.Any? origin=null
-              then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.NetRequestStatus.Error'
+              then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.NetRequestStatus.Error'
                 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>.NetRequestStatus.Error<T of <root>.NetRequestStatus.Error>
                 GET_VAR 'other: kotlin.Any? declared in <root>.NetRequestStatus.Error.equals' type=kotlin.Any? origin=null
-              then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.NetRequestStatus.Error'
+              then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.NetRequestStatus.Error'
                 CONST Boolean type=kotlin.Boolean value=false
           VAR IR_TEMPORARY_VARIABLE name:tmp_0 type:<root>.NetRequestStatus.Error<T of <root>.NetRequestStatus.Error> [val]
             TYPE_OP type=<root>.NetRequestStatus.Error<T of <root>.NetRequestStatus.Error> origin=CAST typeOperand=<root>.NetRequestStatus.Error<T of <root>.NetRequestStatus.Error>
@@ -108,7 +108,7 @@ FILE fqName:<root> fileName:/kt45236.kt
                     receiver: GET_VAR '<this>: <root>.NetRequestStatus.Error<T of <root>.NetRequestStatus.Error> declared in <root>.NetRequestStatus.Error.equals' type=<root>.NetRequestStatus.Error<T of <root>.NetRequestStatus.Error> origin=null
                   arg1: GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:error type:kotlin.Throwable visibility:private [final]' type=kotlin.Throwable origin=null
                     receiver: GET_VAR 'val tmp_0: <root>.NetRequestStatus.Error<T of <root>.NetRequestStatus.Error> [val] declared in <root>.NetRequestStatus.Error.equals' type=<root>.NetRequestStatus.Error<T of <root>.NetRequestStatus.Error> origin=null
-              then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.NetRequestStatus.Error'
+              then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.NetRequestStatus.Error'
                 CONST Boolean type=kotlin.Boolean value=false
           WHEN type=kotlin.Unit origin=null
             BRANCH
@@ -118,14 +118,14 @@ FILE fqName:<root> fileName:/kt45236.kt
                     receiver: GET_VAR '<this>: <root>.NetRequestStatus.Error<T of <root>.NetRequestStatus.Error> declared in <root>.NetRequestStatus.Error.equals' type=<root>.NetRequestStatus.Error<T of <root>.NetRequestStatus.Error> origin=null
                   arg1: GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:value type:T of <root>.NetRequestStatus.Error? visibility:private [final]' type=T of <root>.NetRequestStatus.Error? origin=null
                     receiver: GET_VAR 'val tmp_0: <root>.NetRequestStatus.Error<T of <root>.NetRequestStatus.Error> [val] declared in <root>.NetRequestStatus.Error.equals' type=<root>.NetRequestStatus.Error<T of <root>.NetRequestStatus.Error> origin=null
-              then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.NetRequestStatus.Error'
+              then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.NetRequestStatus.Error'
                 CONST Boolean type=kotlin.Boolean value=false
-          RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.NetRequestStatus.Error'
+          RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.NetRequestStatus.Error'
             CONST Boolean type=kotlin.Boolean value=true
       FUN GENERATED_DATA_CLASS_MEMBER name:hashCode visibility:public modality:OPEN <> ($this:<root>.NetRequestStatus.Error<T of <root>.NetRequestStatus.Error>) 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>.NetRequestStatus.Error<T of <root>.NetRequestStatus.Error>
+        $this: VALUE_PARAMETER name:<this> type:<root>.NetRequestStatus.Error<T of <root>.NetRequestStatus.Error>
         BLOCK_BODY
           VAR name:result type:kotlin.Int [var]
             CALL 'public open fun hashCode (): kotlin.Int [fake_override] declared in kotlin.Throwable' type=kotlin.Int origin=null
@@ -153,7 +153,7 @@ FILE fqName:<root> fileName:/kt45236.kt
       FUN GENERATED_DATA_CLASS_MEMBER name:toString visibility:public modality:OPEN <> ($this:<root>.NetRequestStatus.Error<T of <root>.NetRequestStatus.Error>) 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>.NetRequestStatus.Error<T of <root>.NetRequestStatus.Error>
+        $this: VALUE_PARAMETER name:<this> type:<root>.NetRequestStatus.Error<T of <root>.NetRequestStatus.Error>
         BLOCK_BODY
           RETURN type=kotlin.Nothing from='public open fun toString (): kotlin.String declared in <root>.NetRequestStatus.Error'
             STRING_CONCATENATION type=kotlin.String
diff --git a/compiler/testData/ir/irText/types/nullChecks/enhancedNullabilityInForLoop.fir.ir.txt b/compiler/testData/ir/irText/types/nullChecks/enhancedNullabilityInForLoop.fir.ir.txt
index bf5e085709d..663400dc9cb 100644
--- a/compiler/testData/ir/irText/types/nullChecks/enhancedNullabilityInForLoop.fir.ir.txt
+++ b/compiler/testData/ir/irText/types/nullChecks/enhancedNullabilityInForLoop.fir.ir.txt
@@ -182,24 +182,24 @@ FILE fqName:<root> fileName:/enhancedNullabilityInForLoop.kt
           CONSTRUCTOR_CALL 'public constructor <init> (x: kotlin.Int, y: kotlin.Int) [primary] declared in <root>.P' type=<root>.P origin=null
             x: GET_VAR 'x: kotlin.Int declared in <root>.P.copy' type=kotlin.Int origin=null
             y: GET_VAR 'y: kotlin.Int declared in <root>.P.copy' type=kotlin.Int origin=null
-    FUN GENERATED_DATA_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.P, other:kotlin.Any?) returnType:kotlin.Boolean
+    FUN GENERATED_DATA_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.P, 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 GENERATED_DATA_CLASS_MEMBER name:<this> type:<root>.P
-      VALUE_PARAMETER GENERATED_DATA_CLASS_MEMBER name:other index:0 type:kotlin.Any?
+      $this: VALUE_PARAMETER name:<this> type:<root>.P
+      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>.P declared in <root>.P.equals' type=<root>.P origin=null
               arg1: GET_VAR 'other: kotlin.Any? declared in <root>.P.equals' type=kotlin.Any? origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.P'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.P'
               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>.P
               GET_VAR 'other: kotlin.Any? declared in <root>.P.equals' type=kotlin.Any? origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.P'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.P'
               CONST Boolean type=kotlin.Boolean value=false
         VAR IR_TEMPORARY_VARIABLE name:tmp_6 type:<root>.P [val]
           TYPE_OP type=<root>.P origin=CAST typeOperand=<root>.P
@@ -212,7 +212,7 @@ FILE fqName:<root> fileName:/enhancedNullabilityInForLoop.kt
                   receiver: GET_VAR '<this>: <root>.P declared in <root>.P.equals' type=<root>.P origin=null
                 arg1: GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:x type:kotlin.Int visibility:private [final]' type=kotlin.Int origin=null
                   receiver: GET_VAR 'val tmp_6: <root>.P [val] declared in <root>.P.equals' type=<root>.P origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.P'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.P'
               CONST Boolean type=kotlin.Boolean value=false
         WHEN type=kotlin.Unit origin=null
           BRANCH
@@ -222,14 +222,14 @@ FILE fqName:<root> fileName:/enhancedNullabilityInForLoop.kt
                   receiver: GET_VAR '<this>: <root>.P declared in <root>.P.equals' type=<root>.P origin=null
                 arg1: GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:y type:kotlin.Int visibility:private [final]' type=kotlin.Int origin=null
                   receiver: GET_VAR 'val tmp_6: <root>.P [val] declared in <root>.P.equals' type=<root>.P origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.P'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.P'
               CONST Boolean type=kotlin.Boolean value=false
-        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.P'
+        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.P'
           CONST Boolean type=kotlin.Boolean value=true
     FUN GENERATED_DATA_CLASS_MEMBER name:hashCode visibility:public modality:OPEN <> ($this:<root>.P) 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>.P
+      $this: VALUE_PARAMETER name:<this> type:<root>.P
       BLOCK_BODY
         VAR name:result type:kotlin.Int [var]
           CALL 'public open fun hashCode (): kotlin.Int [fake_override] declared in kotlin.Int' type=kotlin.Int origin=null
@@ -248,7 +248,7 @@ FILE fqName:<root> fileName:/enhancedNullabilityInForLoop.kt
     FUN GENERATED_DATA_CLASS_MEMBER name:toString visibility:public modality:OPEN <> ($this:<root>.P) 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>.P
+      $this: VALUE_PARAMETER name:<this> type:<root>.P
       BLOCK_BODY
         RETURN type=kotlin.Nothing from='public open fun toString (): kotlin.String declared in <root>.P'
           STRING_CONCATENATION type=kotlin.String
diff --git a/compiler/testData/ir/irText/types/nullChecks/enhancedNullabilityInForLoop.fir.kt.txt b/compiler/testData/ir/irText/types/nullChecks/enhancedNullabilityInForLoop.fir.kt.txt
index 62dec72a4ca..a18fa637057 100644
--- a/compiler/testData/ir/irText/types/nullChecks/enhancedNullabilityInForLoop.fir.kt.txt
+++ b/compiler/testData/ir/irText/types/nullChecks/enhancedNullabilityInForLoop.fir.kt.txt
@@ -101,7 +101,7 @@ data class P {
     return P(x = x, y = y)
   }
 
-  override fun equals(other: Any?): Boolean {
+  override operator fun equals(other: Any?): Boolean {
     when {
       EQEQEQ(arg0 = <this>, arg1 = other) -> return true
     }
diff --git a/compiler/testData/ir/irText/types/typeAliasWithUnsafeVariance.fir.ir.txt b/compiler/testData/ir/irText/types/typeAliasWithUnsafeVariance.fir.ir.txt
index 9431116e3e0..dcfc355a4e9 100644
--- a/compiler/testData/ir/irText/types/typeAliasWithUnsafeVariance.fir.ir.txt
+++ b/compiler/testData/ir/irText/types/typeAliasWithUnsafeVariance.fir.ir.txt
@@ -37,24 +37,24 @@ FILE fqName:<root> fileName:/typeAliasWithUnsafeVariance.kt
           CONSTRUCTOR_CALL 'public constructor <init> (action: kotlin.Function1<RenderingT of <root>.Tag, kotlin.Unit>) [primary] declared in <root>.Tag' type=<root>.Tag<RenderingT of <root>.Tag> origin=null
             <class: RenderingT>: kotlin.Any
             action: GET_VAR 'action: kotlin.Function1<RenderingT of <root>.Tag, kotlin.Unit> declared in <root>.Tag.copy' type=kotlin.Function1<RenderingT of <root>.Tag, kotlin.Unit> origin=null
-    FUN GENERATED_DATA_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.Tag<RenderingT of <root>.Tag>, other:kotlin.Any?) returnType:kotlin.Boolean
+    FUN GENERATED_DATA_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.Tag<RenderingT of <root>.Tag>, 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 GENERATED_DATA_CLASS_MEMBER name:<this> type:<root>.Tag<RenderingT of <root>.Tag>
-      VALUE_PARAMETER GENERATED_DATA_CLASS_MEMBER name:other index:0 type:kotlin.Any?
+      $this: VALUE_PARAMETER name:<this> type:<root>.Tag<RenderingT of <root>.Tag>
+      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>.Tag<RenderingT of <root>.Tag> declared in <root>.Tag.equals' type=<root>.Tag<RenderingT of <root>.Tag> origin=null
               arg1: GET_VAR 'other: kotlin.Any? declared in <root>.Tag.equals' type=kotlin.Any? origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Tag'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Tag'
               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>.Tag<RenderingT of <root>.Tag>
               GET_VAR 'other: kotlin.Any? declared in <root>.Tag.equals' type=kotlin.Any? origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Tag'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Tag'
               CONST Boolean type=kotlin.Boolean value=false
         VAR IR_TEMPORARY_VARIABLE name:tmp_0 type:<root>.Tag<RenderingT of <root>.Tag> [val]
           TYPE_OP type=<root>.Tag<RenderingT of <root>.Tag> origin=CAST typeOperand=<root>.Tag<RenderingT of <root>.Tag>
@@ -67,14 +67,14 @@ FILE fqName:<root> fileName:/typeAliasWithUnsafeVariance.kt
                   receiver: GET_VAR '<this>: <root>.Tag<RenderingT of <root>.Tag> declared in <root>.Tag.equals' type=<root>.Tag<RenderingT of <root>.Tag> origin=null
                 arg1: GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:action type:kotlin.Function1<RenderingT of <root>.Tag, kotlin.Unit> visibility:private [final]' type=kotlin.Function1<RenderingT of <root>.Tag, kotlin.Unit> origin=null
                   receiver: GET_VAR 'val tmp_0: <root>.Tag<RenderingT of <root>.Tag> [val] declared in <root>.Tag.equals' type=<root>.Tag<RenderingT of <root>.Tag> origin=null
-            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Tag'
+            then: RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Tag'
               CONST Boolean type=kotlin.Boolean value=false
-        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Tag'
+        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Tag'
           CONST Boolean type=kotlin.Boolean value=true
     FUN GENERATED_DATA_CLASS_MEMBER name:hashCode visibility:public modality:OPEN <> ($this:<root>.Tag<RenderingT of <root>.Tag>) 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>.Tag<RenderingT of <root>.Tag>
+      $this: VALUE_PARAMETER name:<this> type:<root>.Tag<RenderingT of <root>.Tag>
       BLOCK_BODY
         RETURN type=kotlin.Nothing from='public open fun hashCode (): kotlin.Int declared in <root>.Tag'
           CALL 'public open fun hashCode (): kotlin.Int [fake_override] declared in kotlin.Function1' type=kotlin.Int origin=null
@@ -83,7 +83,7 @@ FILE fqName:<root> fileName:/typeAliasWithUnsafeVariance.kt
     FUN GENERATED_DATA_CLASS_MEMBER name:toString visibility:public modality:OPEN <> ($this:<root>.Tag<RenderingT of <root>.Tag>) 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>.Tag<RenderingT of <root>.Tag>
+      $this: VALUE_PARAMETER name:<this> type:<root>.Tag<RenderingT of <root>.Tag>
       BLOCK_BODY
         RETURN type=kotlin.Nothing from='public open fun toString (): kotlin.String declared in <root>.Tag'
           STRING_CONCATENATION type=kotlin.String
diff --git a/compiler/testData/ir/irText/types/typeAliasWithUnsafeVariance.fir.kt.txt b/compiler/testData/ir/irText/types/typeAliasWithUnsafeVariance.fir.kt.txt
index a80d2ab0cf4..540e29dfc3b 100644
--- a/compiler/testData/ir/irText/types/typeAliasWithUnsafeVariance.fir.kt.txt
+++ b/compiler/testData/ir/irText/types/typeAliasWithUnsafeVariance.fir.kt.txt
@@ -18,7 +18,7 @@ data class Tag<out RenderingT : Any?> {
     return Tag<Any>(action = action)
   }
 
-  override fun equals(other: Any?): Boolean {
+  override operator fun equals(other: Any?): Boolean {
     when {
       EQEQEQ(arg0 = <this>, arg1 = other) -> return true
     }