diff --git a/compiler/cli/cli-js/src/org/jetbrains/kotlin/cli/js/klib/compilerPipeline.kt b/compiler/cli/cli-js/src/org/jetbrains/kotlin/cli/js/klib/compilerPipeline.kt
index d91b29f10aa..2537827e7e1 100644
--- a/compiler/cli/cli-js/src/org/jetbrains/kotlin/cli/js/klib/compilerPipeline.kt
+++ b/compiler/cli/cli-js/src/org/jetbrains/kotlin/cli/js/klib/compilerPipeline.kt
@@ -251,8 +251,7 @@ fun transformFirToIr(
             inlineConstTracker = null,
             expectActualTracker = moduleStructure.compilerConfiguration[CommonConfigurationKeys.EXPECT_ACTUAL_TRACKER],
             allowNonCachedDeclarations = false,
-            useIrFakeOverrideBuilder =
-            moduleStructure.compilerConfiguration.getBoolean(CommonConfigurationKeys.USE_IR_FAKE_OVERRIDE_BUILDER),
+            useIrFakeOverrideBuilder = true
         ),
         IrGenerationExtension.getInstances(moduleStructure.project),
         signatureComposer = DescriptorSignatureComposerStub(JsManglerDesc),
diff --git a/compiler/fir/fir2ir/tests-gen/org/jetbrains/kotlin/test/runners/ir/FirLightTreeJvmIrTextTestGenerated.java b/compiler/fir/fir2ir/tests-gen/org/jetbrains/kotlin/test/runners/ir/FirLightTreeJvmIrTextTestGenerated.java
index f438892f6c3..3716d33c645 100644
--- a/compiler/fir/fir2ir/tests-gen/org/jetbrains/kotlin/test/runners/ir/FirLightTreeJvmIrTextTestGenerated.java
+++ b/compiler/fir/fir2ir/tests-gen/org/jetbrains/kotlin/test/runners/ir/FirLightTreeJvmIrTextTestGenerated.java
@@ -280,6 +280,12 @@ public class FirLightTreeJvmIrTextTestGenerated extends AbstractFirLightTreeJvmI
             runTest("compiler/testData/ir/irText/classes/outerClassAccess.kt");
         }
 
+        @Test
+        @TestMetadata("overriddenEquals.kt")
+        public void testOverriddenEquals() throws Exception {
+            runTest("compiler/testData/ir/irText/classes/overriddenEquals.kt");
+        }
+
         @Test
         @TestMetadata("primaryConstructor.kt")
         public void testPrimaryConstructor() throws Exception {
diff --git a/compiler/fir/fir2ir/tests-gen/org/jetbrains/kotlin/test/runners/ir/FirPsiJvmIrTextTestGenerated.java b/compiler/fir/fir2ir/tests-gen/org/jetbrains/kotlin/test/runners/ir/FirPsiJvmIrTextTestGenerated.java
index b900e390129..a4567ab3465 100644
--- a/compiler/fir/fir2ir/tests-gen/org/jetbrains/kotlin/test/runners/ir/FirPsiJvmIrTextTestGenerated.java
+++ b/compiler/fir/fir2ir/tests-gen/org/jetbrains/kotlin/test/runners/ir/FirPsiJvmIrTextTestGenerated.java
@@ -280,6 +280,12 @@ public class FirPsiJvmIrTextTestGenerated extends AbstractFirPsiJvmIrTextTest {
             runTest("compiler/testData/ir/irText/classes/outerClassAccess.kt");
         }
 
+        @Test
+        @TestMetadata("overriddenEquals.kt")
+        public void testOverriddenEquals() throws Exception {
+            runTest("compiler/testData/ir/irText/classes/overriddenEquals.kt");
+        }
+
         @Test
         @TestMetadata("primaryConstructor.kt")
         public void testPrimaryConstructor() throws Exception {
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 e94b2444573..76c463b2557 100644
--- a/compiler/testData/ir/irText/classes/dataClasses/delegationInSealed.fir.ir.txt
+++ b/compiler/testData/ir/irText/classes/dataClasses/delegationInSealed.fir.ir.txt
@@ -84,7 +84,8 @@ FILE fqName:<root> fileName:/delegationInSealed.kt
               c: GET_VAR 'c: kotlin.CharSequence declared in <root>.A.B.copy' type=kotlin.CharSequence origin=null
       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
+          public open fun toString (): kotlin.String declared in <root>.A
+          public open fun toString (): kotlin.String declared in kotlin.CharSequence
         $this: VALUE_PARAMETER name:<this> type:<root>.A.B
         BLOCK_BODY
           RETURN type=kotlin.Nothing from='public open fun toString (): kotlin.String declared in <root>.A.B'
@@ -96,7 +97,8 @@ FILE fqName:<root> fileName:/delegationInSealed.kt
               CONST String type=kotlin.String value=")"
       FUN GENERATED_DATA_CLASS_MEMBER name:hashCode visibility:public modality:OPEN <> ($this:<root>.A.B) returnType:kotlin.Int
         overridden:
-          public open fun hashCode (): kotlin.Int declared in kotlin.Any
+          public open fun hashCode (): kotlin.Int declared in <root>.A
+          public open fun hashCode (): kotlin.Int declared in kotlin.CharSequence
         $this: VALUE_PARAMETER name:<this> type:<root>.A.B
         BLOCK_BODY
           RETURN type=kotlin.Nothing from='public open fun hashCode (): kotlin.Int declared in <root>.A.B'
@@ -105,7 +107,8 @@ FILE fqName:<root> fileName:/delegationInSealed.kt
                 receiver: GET_VAR '<this>: <root>.A.B declared in <root>.A.B.hashCode' type=<root>.A.B origin=null
       FUN GENERATED_DATA_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.A.B, other:kotlin.Any?) returnType:kotlin.Boolean [operator]
         overridden:
-          public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in kotlin.Any
+          public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.A
+          public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in kotlin.CharSequence
         $this: VALUE_PARAMETER name:<this> type:<root>.A.B
         VALUE_PARAMETER name:other index:0 type:kotlin.Any?
         BLOCK_BODY
diff --git a/compiler/testData/ir/irText/classes/dataClasses/delegationInSealed.kt b/compiler/testData/ir/irText/classes/dataClasses/delegationInSealed.kt
index 2c531a32e60..770a36f1a6a 100644
--- a/compiler/testData/ir/irText/classes/dataClasses/delegationInSealed.kt
+++ b/compiler/testData/ir/irText/classes/dataClasses/delegationInSealed.kt
@@ -2,6 +2,10 @@
 // SKIP_KLIB_TEST
 // IGNORE_BACKEND_K1: JS_IR
 
+// KT-64271
+// IGNORE_BACKEND_K2: JVM_IR
+
+
 sealed class A : CharSequence {
     data class B(val c: CharSequence) : A(), CharSequence by c
 }
diff --git a/compiler/testData/ir/irText/classes/enumClassModality.kt b/compiler/testData/ir/irText/classes/enumClassModality.kt
index 7096f0638fd..01227fd5025 100644
--- a/compiler/testData/ir/irText/classes/enumClassModality.kt
+++ b/compiler/testData/ir/irText/classes/enumClassModality.kt
@@ -1,3 +1,6 @@
+// KT-64271, KT-64382
+// IGNORE_BACKEND_K2: NATIVE, WASM, JS_IR, JS_IR_ES6
+
 enum class TestFinalEnum1 {
     X1
 }
diff --git a/compiler/testData/ir/irText/classes/overriddenEquals.ir.txt b/compiler/testData/ir/irText/classes/overriddenEquals.ir.txt
new file mode 100644
index 00000000000..d2e758916d6
--- /dev/null
+++ b/compiler/testData/ir/irText/classes/overriddenEquals.ir.txt
@@ -0,0 +1,84 @@
+FILE fqName:<root> fileName:/overriddenEquals.kt
+  CLASS CLASS name:Base modality:OPEN visibility:public superTypes:[kotlin.Any]
+    $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:<root>.Base
+    CONSTRUCTOR visibility:public <> () returnType:<root>.Base [primary]
+      BLOCK_BODY
+        DELEGATING_CONSTRUCTOR_CALL 'public constructor <init> () declared in kotlin.Any'
+        INSTANCE_INITIALIZER_CALL classDescriptor='CLASS CLASS name:Base modality:OPEN visibility:public superTypes:[kotlin.Any]'
+    FUN name:equals visibility:public modality:OPEN <> ($this:<root>.Base, other:kotlin.Any?) returnType:kotlin.Boolean [operator]
+      overridden:
+        public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in kotlin.Any
+      $this: VALUE_PARAMETER name:<this> type:<root>.Base
+      VALUE_PARAMETER name:other index:0 type:kotlin.Any?
+      BLOCK_BODY
+        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Base'
+          CALL 'public final fun EQEQEQ (arg0: kotlin.Any?, arg1: kotlin.Any?): kotlin.Boolean declared in kotlin.internal.ir' type=kotlin.Boolean origin=EQEQEQ
+            arg0: GET_VAR '<this>: <root>.Base declared in <root>.Base.equals' type=<root>.Base origin=null
+            arg1: GET_VAR 'other: kotlin.Any? declared in <root>.Base.equals' type=kotlin.Any? origin=null
+    FUN FAKE_OVERRIDE name:hashCode visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.Int [fake_override]
+      overridden:
+        public open fun hashCode (): kotlin.Int declared in kotlin.Any
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
+    FUN FAKE_OVERRIDE name:toString visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.String [fake_override]
+      overridden:
+        public open fun toString (): kotlin.String declared in kotlin.Any
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
+  CLASS INTERFACE name:I modality:ABSTRACT visibility:public superTypes:[kotlin.Any]
+    $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:<root>.I
+    FUN FAKE_OVERRIDE name:equals visibility:public modality:OPEN <> ($this:kotlin.Any, other:kotlin.Any?) returnType:kotlin.Boolean [fake_override,operator]
+      overridden:
+        public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in kotlin.Any
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
+      VALUE_PARAMETER name:other index:0 type:kotlin.Any?
+    FUN FAKE_OVERRIDE name:hashCode visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.Int [fake_override]
+      overridden:
+        public open fun hashCode (): kotlin.Int declared in kotlin.Any
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
+    FUN FAKE_OVERRIDE name:toString visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.String [fake_override]
+      overridden:
+        public open fun toString (): kotlin.String declared in kotlin.Any
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
+  CLASS CLASS name:Child1 modality:FINAL visibility:public superTypes:[<root>.Base; <root>.I]
+    $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:<root>.Child1
+    CONSTRUCTOR visibility:public <> () returnType:<root>.Child1 [primary]
+      BLOCK_BODY
+        DELEGATING_CONSTRUCTOR_CALL 'public constructor <init> () declared in <root>.Base'
+        INSTANCE_INITIALIZER_CALL classDescriptor='CLASS CLASS name:Child1 modality:FINAL visibility:public superTypes:[<root>.Base; <root>.I]'
+    FUN FAKE_OVERRIDE name:equals visibility:public modality:OPEN <> ($this:<root>.Base, other:kotlin.Any?) returnType:kotlin.Boolean [fake_override,operator]
+      overridden:
+        public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Base
+        public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.I
+      $this: VALUE_PARAMETER name:<this> type:<root>.Base
+      VALUE_PARAMETER name:other index:0 type:kotlin.Any?
+    FUN FAKE_OVERRIDE name:hashCode visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.Int [fake_override]
+      overridden:
+        public open fun hashCode (): kotlin.Int declared in <root>.Base
+        public open fun hashCode (): kotlin.Int declared in <root>.I
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
+    FUN FAKE_OVERRIDE name:toString visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.String [fake_override]
+      overridden:
+        public open fun toString (): kotlin.String declared in <root>.Base
+        public open fun toString (): kotlin.String declared in <root>.I
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
+  CLASS CLASS name:Child2 modality:FINAL visibility:public superTypes:[<root>.I; <root>.Base]
+    $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:<root>.Child2
+    CONSTRUCTOR visibility:public <> () returnType:<root>.Child2 [primary]
+      BLOCK_BODY
+        DELEGATING_CONSTRUCTOR_CALL 'public constructor <init> () declared in <root>.Base'
+        INSTANCE_INITIALIZER_CALL classDescriptor='CLASS CLASS name:Child2 modality:FINAL visibility:public superTypes:[<root>.I; <root>.Base]'
+    FUN FAKE_OVERRIDE name:equals visibility:public modality:OPEN <> ($this:kotlin.Any, other:kotlin.Any?) returnType:kotlin.Boolean [fake_override,operator]
+      overridden:
+        public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.I
+        public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Base
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
+      VALUE_PARAMETER name:other index:0 type:kotlin.Any?
+    FUN FAKE_OVERRIDE name:hashCode visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.Int [fake_override]
+      overridden:
+        public open fun hashCode (): kotlin.Int declared in <root>.I
+        public open fun hashCode (): kotlin.Int declared in <root>.Base
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
+    FUN FAKE_OVERRIDE name:toString visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.String [fake_override]
+      overridden:
+        public open fun toString (): kotlin.String declared in <root>.I
+        public open fun toString (): kotlin.String declared in <root>.Base
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
diff --git a/compiler/testData/ir/irText/classes/overriddenEquals.kt b/compiler/testData/ir/irText/classes/overriddenEquals.kt
new file mode 100644
index 00000000000..897a54e2622
--- /dev/null
+++ b/compiler/testData/ir/irText/classes/overriddenEquals.kt
@@ -0,0 +1,16 @@
+// FIR_IDENTICAL
+// KT-64271
+// IGNORE_BACKEND_K2: JVM_IR
+
+open class Base {
+    override fun equals(other: Any?): Boolean {
+        return this === other
+    }
+}
+
+interface I {
+
+}
+
+class Child1 : Base(), I
+class Child2 : I, Base()
\ No newline at end of file
diff --git a/compiler/testData/ir/irText/classes/overriddenEquals.kt.txt b/compiler/testData/ir/irText/classes/overriddenEquals.kt.txt
new file mode 100644
index 00000000000..9e3d7620d42
--- /dev/null
+++ b/compiler/testData/ir/irText/classes/overriddenEquals.kt.txt
@@ -0,0 +1,33 @@
+open class Base {
+  constructor() /* primary */ {
+    super/*Any*/()
+    /* <init>() */
+
+  }
+
+  override operator fun equals(other: Any?): Boolean {
+    return EQEQEQ(arg0 = <this>, arg1 = other)
+  }
+
+}
+
+interface I {
+}
+
+class Child1 : Base, I {
+  constructor() /* primary */ {
+    super/*Base*/()
+    /* <init>() */
+
+  }
+
+}
+
+class Child2 : I, Base {
+  constructor() /* primary */ {
+    super/*Base*/()
+    /* <init>() */
+
+  }
+
+}
diff --git a/compiler/testData/ir/irText/classes/overriddenEquals.sig.kt.txt b/compiler/testData/ir/irText/classes/overriddenEquals.sig.kt.txt
new file mode 100644
index 00000000000..076762d41a4
--- /dev/null
+++ b/compiler/testData/ir/irText/classes/overriddenEquals.sig.kt.txt
@@ -0,0 +1,72 @@
+// CHECK:
+//   Mangled name: Base
+//   Public signature: /Base|null[0]
+open class Base {
+  // CHECK:
+  //   Mangled name: Base#<init>(){}
+  //   Public signature: /Base.<init>|-5645683436151566731[0]
+  //   Public signature debug description: <init>(){}
+  constructor() /* primary */
+
+  // CHECK JVM_IR:
+  //   Mangled name: Base#equals(kotlin.Any?){}kotlin.Boolean
+  //   Public signature: /Base.equals|722809408929142791[0]
+  //   Public signature debug description: equals(kotlin.Any?){}kotlin.Boolean
+  // CHECK JS_IR NATIVE:
+  //   Mangled name: Base#equals(kotlin.Any?){}
+  //   Public signature: /Base.equals|4638265728071529943[0]
+  //   Public signature debug description: equals(kotlin.Any?){}
+  override operator fun equals(other: Any?): Boolean
+
+}
+
+// CHECK:
+//   Mangled name: Child1
+//   Public signature: /Child1|null[0]
+class Child1 : Base, I {
+  // CHECK:
+  //   Mangled name: Child1#<init>(){}
+  //   Public signature: /Child1.<init>|-5645683436151566731[0]
+  //   Public signature debug description: <init>(){}
+  constructor() /* primary */
+
+  // CHECK JVM_IR:
+  //   Mangled name: Child1#equals(kotlin.Any?){}kotlin.Boolean
+  //   Public signature: /Child1.equals|722809408929142791[0]
+  //   Public signature debug description: equals(kotlin.Any?){}kotlin.Boolean
+  // CHECK JS_IR NATIVE:
+  //   Mangled name: Child1#equals(kotlin.Any?){}
+  //   Public signature: /Child1.equals|4638265728071529943[0]
+  //   Public signature debug description: equals(kotlin.Any?){}
+  /* fake */ override operator fun equals(other: Any?): Boolean
+
+}
+
+// CHECK:
+//   Mangled name: Child2
+//   Public signature: /Child2|null[0]
+class Child2 : Base, I {
+  // CHECK:
+  //   Mangled name: Child2#<init>(){}
+  //   Public signature: /Child2.<init>|-5645683436151566731[0]
+  //   Public signature debug description: <init>(){}
+  constructor() /* primary */
+
+  // CHECK JVM_IR:
+  //   Mangled name: Child2#equals(kotlin.Any?){}kotlin.Boolean
+  //   Public signature: /Child2.equals|722809408929142791[0]
+  //   Public signature debug description: equals(kotlin.Any?){}kotlin.Boolean
+  // CHECK JS_IR NATIVE:
+  //   Mangled name: Child2#equals(kotlin.Any?){}
+  //   Public signature: /Child2.equals|4638265728071529943[0]
+  //   Public signature debug description: equals(kotlin.Any?){}
+  /* fake */ override operator fun equals(other: Any?): Boolean
+
+}
+
+// CHECK:
+//   Mangled name: I
+//   Public signature: /I|null[0]
+interface I {
+}
+
diff --git a/compiler/testData/ir/irText/declarations/inlineCollectionOfInlineClass.fir.ir.txt b/compiler/testData/ir/irText/declarations/inlineCollectionOfInlineClass.fir.ir.txt
deleted file mode 100644
index 4c2f30811de..00000000000
--- a/compiler/testData/ir/irText/declarations/inlineCollectionOfInlineClass.fir.ir.txt
+++ /dev/null
@@ -1,249 +0,0 @@
-FILE fqName:<root> fileName:/inlineCollectionOfInlineClass.kt
-  CLASS CLASS name:IT modality:FINAL visibility:public [value] superTypes:[kotlin.Any]
-    $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:<root>.IT
-    CONSTRUCTOR visibility:public <> (x:kotlin.Int) returnType:<root>.IT [primary]
-      VALUE_PARAMETER name:x index:0 type:kotlin.Int
-      BLOCK_BODY
-        DELEGATING_CONSTRUCTOR_CALL 'public constructor <init> () declared in kotlin.Any'
-        INSTANCE_INITIALIZER_CALL classDescriptor='CLASS CLASS name:IT modality:FINAL visibility:public [value] superTypes:[kotlin.Any]'
-    PROPERTY name:x visibility:public modality:FINAL [val]
-      FIELD PROPERTY_BACKING_FIELD name:x type:kotlin.Int visibility:private [final]
-        EXPRESSION_BODY
-          GET_VAR 'x: kotlin.Int declared in <root>.IT.<init>' type=kotlin.Int origin=INITIALIZE_PROPERTY_FROM_PARAMETER
-      FUN DEFAULT_PROPERTY_ACCESSOR name:<get-x> visibility:public modality:FINAL <> ($this:<root>.IT) returnType:kotlin.Int
-        correspondingProperty: PROPERTY name:x visibility:public modality:FINAL [val]
-        $this: VALUE_PARAMETER name:<this> type:<root>.IT
-        BLOCK_BODY
-          RETURN type=kotlin.Nothing from='public final fun <get-x> (): kotlin.Int declared in <root>.IT'
-            GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:x type:kotlin.Int visibility:private [final]' type=kotlin.Int origin=null
-              receiver: GET_VAR '<this>: <root>.IT declared in <root>.IT.<get-x>' type=<root>.IT origin=null
-    FUN GENERATED_SINGLE_FIELD_VALUE_CLASS_MEMBER name:toString visibility:public modality:OPEN <> ($this:<root>.IT) returnType:kotlin.String
-      overridden:
-        public open fun toString (): kotlin.String declared in kotlin.Any
-      $this: VALUE_PARAMETER name:<this> type:<root>.IT
-      BLOCK_BODY
-        RETURN type=kotlin.Nothing from='public open fun toString (): kotlin.String declared in <root>.IT'
-          STRING_CONCATENATION type=kotlin.String
-            CONST String type=kotlin.String value="IT("
-            CONST String type=kotlin.String value="x="
-            GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:x type:kotlin.Int visibility:private [final]' type=kotlin.Int origin=null
-              receiver: GET_VAR '<this>: <root>.IT declared in <root>.IT.toString' type=<root>.IT origin=null
-            CONST String type=kotlin.String value=")"
-    FUN GENERATED_SINGLE_FIELD_VALUE_CLASS_MEMBER name:hashCode visibility:public modality:OPEN <> ($this:<root>.IT) returnType:kotlin.Int
-      overridden:
-        public open fun hashCode (): kotlin.Int declared in kotlin.Any
-      $this: VALUE_PARAMETER 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 declared in kotlin.Int' type=kotlin.Int origin=null
-            $this: GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:x type:kotlin.Int visibility:private [final]' type=kotlin.Int origin=null
-              receiver: GET_VAR '<this>: <root>.IT declared in <root>.IT.hashCode' type=<root>.IT origin=null
-    FUN GENERATED_SINGLE_FIELD_VALUE_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.IT, other:kotlin.Any?) returnType:kotlin.Boolean [operator]
-      overridden:
-        public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in 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'
-              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
-            GET_VAR 'other: kotlin.Any? declared in <root>.IT.equals' type=kotlin.Any? origin=null
-        WHEN type=kotlin.Unit origin=null
-          BRANCH
-            if: CALL 'public final fun not (): kotlin.Boolean declared in kotlin.Boolean' type=kotlin.Boolean origin=EXCLEQ
-              $this: CALL 'public final fun EQEQ (arg0: kotlin.Any?, arg1: kotlin.Any?): kotlin.Boolean declared in kotlin.internal.ir' type=kotlin.Boolean origin=EXCLEQ
-                arg0: 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.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 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'
-              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'
-          CONST Boolean type=kotlin.Boolean value=true
-  CLASS CLASS name:InlineMutableSet modality:FINAL visibility:public [value] superTypes:[kotlin.collections.MutableSet<<root>.IT>]
-    $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:<root>.InlineMutableSet
-    CONSTRUCTOR visibility:public <> (ms:kotlin.collections.MutableSet<<root>.IT>) returnType:<root>.InlineMutableSet [primary]
-      VALUE_PARAMETER name:ms index:0 type:kotlin.collections.MutableSet<<root>.IT>
-      BLOCK_BODY
-        DELEGATING_CONSTRUCTOR_CALL 'public constructor <init> () declared in kotlin.Any'
-        INSTANCE_INITIALIZER_CALL classDescriptor='CLASS CLASS name:InlineMutableSet modality:FINAL visibility:public [value] superTypes:[kotlin.collections.MutableSet<<root>.IT>]'
-    PROPERTY name:ms visibility:private modality:FINAL [val]
-      FIELD PROPERTY_BACKING_FIELD name:ms type:kotlin.collections.MutableSet<<root>.IT> visibility:private [final]
-        EXPRESSION_BODY
-          GET_VAR 'ms: kotlin.collections.MutableSet<<root>.IT> declared in <root>.InlineMutableSet.<init>' type=kotlin.collections.MutableSet<<root>.IT> origin=INITIALIZE_PROPERTY_FROM_PARAMETER
-      FUN DEFAULT_PROPERTY_ACCESSOR name:<get-ms> visibility:private modality:FINAL <> ($this:<root>.InlineMutableSet) returnType:kotlin.collections.MutableSet<<root>.IT>
-        correspondingProperty: PROPERTY name:ms visibility:private modality:FINAL [val]
-        $this: VALUE_PARAMETER name:<this> type:<root>.InlineMutableSet
-        BLOCK_BODY
-          RETURN type=kotlin.Nothing from='private final fun <get-ms> (): kotlin.collections.MutableSet<<root>.IT> declared in <root>.InlineMutableSet'
-            GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:ms type:kotlin.collections.MutableSet<<root>.IT> visibility:private [final]' type=kotlin.collections.MutableSet<<root>.IT> origin=null
-              receiver: GET_VAR '<this>: <root>.InlineMutableSet declared in <root>.InlineMutableSet.<get-ms>' type=<root>.InlineMutableSet origin=null
-    PROPERTY name:size visibility:public modality:OPEN [val]
-      overridden:
-        public abstract size: kotlin.Int
-      FUN name:<get-size> visibility:public modality:OPEN <> ($this:<root>.InlineMutableSet) returnType:kotlin.Int
-        correspondingProperty: PROPERTY name:size visibility:public modality:OPEN [val]
-        overridden:
-          public abstract fun <get-size> (): kotlin.Int declared in kotlin.collections.MutableSet
-        $this: VALUE_PARAMETER name:<this> type:<root>.InlineMutableSet
-        BLOCK_BODY
-          RETURN type=kotlin.Nothing from='public open fun <get-size> (): kotlin.Int declared in <root>.InlineMutableSet'
-            CALL 'public abstract fun <get-size> (): kotlin.Int declared in kotlin.collections.MutableSet' type=kotlin.Int origin=GET_PROPERTY
-              $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
-                $this: GET_VAR '<this>: <root>.InlineMutableSet declared in <root>.InlineMutableSet.<get-size>' type=<root>.InlineMutableSet origin=null
-    FUN name:contains visibility:public modality:OPEN <> ($this:<root>.InlineMutableSet, element:<root>.IT) returnType:kotlin.Boolean [operator]
-      overridden:
-        public abstract fun contains (element: E of kotlin.collections.MutableSet): kotlin.Boolean declared in kotlin.collections.MutableSet
-      $this: VALUE_PARAMETER name:<this> type:<root>.InlineMutableSet
-      VALUE_PARAMETER name:element index:0 type:<root>.IT
-      BLOCK_BODY
-        RETURN type=kotlin.Nothing from='public open fun contains (element: <root>.IT): kotlin.Boolean declared in <root>.InlineMutableSet'
-          CALL 'public abstract fun contains (element: E of kotlin.collections.MutableSet): kotlin.Boolean declared in kotlin.collections.MutableSet' type=kotlin.Boolean origin=null
-            $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
-              $this: GET_VAR '<this>: <root>.InlineMutableSet declared in <root>.InlineMutableSet.contains' type=<root>.InlineMutableSet origin=null
-            element: GET_VAR 'element: <root>.IT declared in <root>.InlineMutableSet.contains' type=<root>.IT origin=null
-    FUN name:containsAll visibility:public modality:OPEN <> ($this:<root>.InlineMutableSet, elements:kotlin.collections.Collection<<root>.IT>) returnType:kotlin.Boolean
-      overridden:
-        public abstract fun containsAll (elements: kotlin.collections.Collection<E of kotlin.collections.MutableSet>): kotlin.Boolean declared in kotlin.collections.MutableSet
-      $this: VALUE_PARAMETER name:<this> type:<root>.InlineMutableSet
-      VALUE_PARAMETER name:elements index:0 type:kotlin.collections.Collection<<root>.IT>
-      BLOCK_BODY
-        RETURN type=kotlin.Nothing from='public open fun containsAll (elements: kotlin.collections.Collection<<root>.IT>): kotlin.Boolean declared in <root>.InlineMutableSet'
-          CALL 'public abstract fun containsAll (elements: kotlin.collections.Collection<E of kotlin.collections.MutableSet>): kotlin.Boolean declared in kotlin.collections.MutableSet' type=kotlin.Boolean origin=null
-            $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
-              $this: GET_VAR '<this>: <root>.InlineMutableSet declared in <root>.InlineMutableSet.containsAll' type=<root>.InlineMutableSet origin=null
-            elements: GET_VAR 'elements: kotlin.collections.Collection<<root>.IT> declared in <root>.InlineMutableSet.containsAll' type=kotlin.collections.Collection<<root>.IT> origin=null
-    FUN name:isEmpty visibility:public modality:OPEN <> ($this:<root>.InlineMutableSet) returnType:kotlin.Boolean
-      overridden:
-        public abstract fun isEmpty (): kotlin.Boolean declared in kotlin.collections.MutableSet
-      $this: VALUE_PARAMETER name:<this> type:<root>.InlineMutableSet
-      BLOCK_BODY
-        RETURN type=kotlin.Nothing from='public open fun isEmpty (): kotlin.Boolean declared in <root>.InlineMutableSet'
-          CALL 'public abstract fun isEmpty (): kotlin.Boolean declared in kotlin.collections.MutableSet' type=kotlin.Boolean origin=null
-            $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
-              $this: GET_VAR '<this>: <root>.InlineMutableSet declared in <root>.InlineMutableSet.isEmpty' type=<root>.InlineMutableSet origin=null
-    FUN name:add visibility:public modality:OPEN <> ($this:<root>.InlineMutableSet, element:<root>.IT) returnType:kotlin.Boolean
-      overridden:
-        public abstract fun add (element: E of kotlin.collections.MutableSet): kotlin.Boolean declared in kotlin.collections.MutableSet
-      $this: VALUE_PARAMETER name:<this> type:<root>.InlineMutableSet
-      VALUE_PARAMETER name:element index:0 type:<root>.IT
-      BLOCK_BODY
-        RETURN type=kotlin.Nothing from='public open fun add (element: <root>.IT): kotlin.Boolean declared in <root>.InlineMutableSet'
-          CALL 'public abstract fun add (element: E of kotlin.collections.MutableSet): kotlin.Boolean declared in kotlin.collections.MutableSet' type=kotlin.Boolean origin=null
-            $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
-              $this: GET_VAR '<this>: <root>.InlineMutableSet declared in <root>.InlineMutableSet.add' type=<root>.InlineMutableSet origin=null
-            element: GET_VAR 'element: <root>.IT declared in <root>.InlineMutableSet.add' type=<root>.IT origin=null
-    FUN name:addAll visibility:public modality:OPEN <> ($this:<root>.InlineMutableSet, elements:kotlin.collections.Collection<<root>.IT>) returnType:kotlin.Boolean
-      overridden:
-        public abstract fun addAll (elements: kotlin.collections.Collection<E of kotlin.collections.MutableSet>): kotlin.Boolean declared in kotlin.collections.MutableSet
-      $this: VALUE_PARAMETER name:<this> type:<root>.InlineMutableSet
-      VALUE_PARAMETER name:elements index:0 type:kotlin.collections.Collection<<root>.IT>
-      BLOCK_BODY
-        RETURN type=kotlin.Nothing from='public open fun addAll (elements: kotlin.collections.Collection<<root>.IT>): kotlin.Boolean declared in <root>.InlineMutableSet'
-          CALL 'public abstract fun addAll (elements: kotlin.collections.Collection<E of kotlin.collections.MutableSet>): kotlin.Boolean declared in kotlin.collections.MutableSet' type=kotlin.Boolean origin=null
-            $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
-              $this: GET_VAR '<this>: <root>.InlineMutableSet declared in <root>.InlineMutableSet.addAll' type=<root>.InlineMutableSet origin=null
-            elements: GET_VAR 'elements: kotlin.collections.Collection<<root>.IT> declared in <root>.InlineMutableSet.addAll' type=kotlin.collections.Collection<<root>.IT> origin=null
-    FUN name:clear visibility:public modality:OPEN <> ($this:<root>.InlineMutableSet) returnType:kotlin.Unit
-      overridden:
-        public abstract fun clear (): kotlin.Unit declared in kotlin.collections.MutableSet
-      $this: VALUE_PARAMETER name:<this> type:<root>.InlineMutableSet
-      BLOCK_BODY
-        CALL 'public abstract fun clear (): kotlin.Unit declared in kotlin.collections.MutableSet' type=kotlin.Unit origin=null
-          $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
-            $this: GET_VAR '<this>: <root>.InlineMutableSet declared in <root>.InlineMutableSet.clear' type=<root>.InlineMutableSet origin=null
-    FUN name:iterator visibility:public modality:OPEN <> ($this:<root>.InlineMutableSet) returnType:kotlin.collections.MutableIterator<<root>.IT> [operator]
-      overridden:
-        public abstract fun iterator (): kotlin.collections.MutableIterator<E of kotlin.collections.MutableSet> declared in kotlin.collections.MutableSet
-      $this: VALUE_PARAMETER name:<this> type:<root>.InlineMutableSet
-      BLOCK_BODY
-        RETURN type=kotlin.Nothing from='public open fun iterator (): kotlin.collections.MutableIterator<<root>.IT> declared in <root>.InlineMutableSet'
-          CALL 'public abstract fun iterator (): kotlin.collections.MutableIterator<E of kotlin.collections.MutableSet> declared in kotlin.collections.MutableSet' type=kotlin.collections.MutableIterator<<root>.IT> origin=null
-            $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
-              $this: GET_VAR '<this>: <root>.InlineMutableSet declared in <root>.InlineMutableSet.iterator' type=<root>.InlineMutableSet origin=null
-    FUN name:remove visibility:public modality:OPEN <> ($this:<root>.InlineMutableSet, element:<root>.IT) returnType:kotlin.Boolean
-      overridden:
-        public abstract fun remove (element: E of kotlin.collections.MutableSet): kotlin.Boolean declared in kotlin.collections.MutableSet
-      $this: VALUE_PARAMETER name:<this> type:<root>.InlineMutableSet
-      VALUE_PARAMETER name:element index:0 type:<root>.IT
-      BLOCK_BODY
-        RETURN type=kotlin.Nothing from='public open fun remove (element: <root>.IT): kotlin.Boolean declared in <root>.InlineMutableSet'
-          CALL 'public abstract fun remove (element: E of kotlin.collections.MutableSet): kotlin.Boolean declared in kotlin.collections.MutableSet' type=kotlin.Boolean origin=null
-            $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
-              $this: GET_VAR '<this>: <root>.InlineMutableSet declared in <root>.InlineMutableSet.remove' type=<root>.InlineMutableSet origin=null
-            element: GET_VAR 'element: <root>.IT declared in <root>.InlineMutableSet.remove' type=<root>.IT origin=null
-    FUN name:removeAll visibility:public modality:OPEN <> ($this:<root>.InlineMutableSet, elements:kotlin.collections.Collection<<root>.IT>) returnType:kotlin.Boolean
-      overridden:
-        public abstract fun removeAll (elements: kotlin.collections.Collection<E of kotlin.collections.MutableSet>): kotlin.Boolean declared in kotlin.collections.MutableSet
-      $this: VALUE_PARAMETER name:<this> type:<root>.InlineMutableSet
-      VALUE_PARAMETER name:elements index:0 type:kotlin.collections.Collection<<root>.IT>
-      BLOCK_BODY
-        RETURN type=kotlin.Nothing from='public open fun removeAll (elements: kotlin.collections.Collection<<root>.IT>): kotlin.Boolean declared in <root>.InlineMutableSet'
-          CALL 'public abstract fun removeAll (elements: kotlin.collections.Collection<E of kotlin.collections.MutableSet>): kotlin.Boolean declared in kotlin.collections.MutableSet' type=kotlin.Boolean origin=null
-            $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
-              $this: GET_VAR '<this>: <root>.InlineMutableSet declared in <root>.InlineMutableSet.removeAll' type=<root>.InlineMutableSet origin=null
-            elements: GET_VAR 'elements: kotlin.collections.Collection<<root>.IT> declared in <root>.InlineMutableSet.removeAll' type=kotlin.collections.Collection<<root>.IT> origin=null
-    FUN name:retainAll visibility:public modality:OPEN <> ($this:<root>.InlineMutableSet, elements:kotlin.collections.Collection<<root>.IT>) returnType:kotlin.Boolean
-      overridden:
-        public abstract fun retainAll (elements: kotlin.collections.Collection<E of kotlin.collections.MutableSet>): kotlin.Boolean declared in kotlin.collections.MutableSet
-      $this: VALUE_PARAMETER name:<this> type:<root>.InlineMutableSet
-      VALUE_PARAMETER name:elements index:0 type:kotlin.collections.Collection<<root>.IT>
-      BLOCK_BODY
-        RETURN type=kotlin.Nothing from='public open fun retainAll (elements: kotlin.collections.Collection<<root>.IT>): kotlin.Boolean declared in <root>.InlineMutableSet'
-          CALL 'public abstract fun retainAll (elements: kotlin.collections.Collection<E of kotlin.collections.MutableSet>): kotlin.Boolean declared in kotlin.collections.MutableSet' type=kotlin.Boolean origin=null
-            $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
-              $this: GET_VAR '<this>: <root>.InlineMutableSet declared in <root>.InlineMutableSet.retainAll' type=<root>.InlineMutableSet origin=null
-            elements: GET_VAR 'elements: kotlin.collections.Collection<<root>.IT> declared in <root>.InlineMutableSet.retainAll' type=kotlin.collections.Collection<<root>.IT> origin=null
-    FUN GENERATED_SINGLE_FIELD_VALUE_CLASS_MEMBER name:toString visibility:public modality:OPEN <> ($this:<root>.InlineMutableSet) returnType:kotlin.String
-      overridden:
-        public open fun toString (): kotlin.String declared in kotlin.Any
-      $this: VALUE_PARAMETER name:<this> type:<root>.InlineMutableSet
-      BLOCK_BODY
-        RETURN type=kotlin.Nothing from='public open fun toString (): kotlin.String declared in <root>.InlineMutableSet'
-          STRING_CONCATENATION type=kotlin.String
-            CONST String type=kotlin.String value="InlineMutableSet("
-            CONST String type=kotlin.String value="ms="
-            GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:ms type:kotlin.collections.MutableSet<<root>.IT> visibility:private [final]' type=kotlin.collections.MutableSet<<root>.IT> origin=null
-              receiver: GET_VAR '<this>: <root>.InlineMutableSet declared in <root>.InlineMutableSet.toString' type=<root>.InlineMutableSet origin=null
-            CONST String type=kotlin.String value=")"
-    FUN GENERATED_SINGLE_FIELD_VALUE_CLASS_MEMBER name:hashCode visibility:public modality:OPEN <> ($this:<root>.InlineMutableSet) returnType:kotlin.Int
-      overridden:
-        public open fun hashCode (): kotlin.Int declared in kotlin.Any
-      $this: VALUE_PARAMETER 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 declared in kotlin.collections.MutableSet' type=kotlin.Int origin=null
-            $this: GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:ms type:kotlin.collections.MutableSet<<root>.IT> visibility:private [final]' type=kotlin.collections.MutableSet<<root>.IT> origin=null
-              receiver: GET_VAR '<this>: <root>.InlineMutableSet declared in <root>.InlineMutableSet.hashCode' type=<root>.InlineMutableSet origin=null
-    FUN GENERATED_SINGLE_FIELD_VALUE_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.InlineMutableSet, other:kotlin.Any?) returnType:kotlin.Boolean [operator]
-      overridden:
-        public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in 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'
-              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
-            GET_VAR 'other: kotlin.Any? declared in <root>.InlineMutableSet.equals' type=kotlin.Any? origin=null
-        WHEN type=kotlin.Unit origin=null
-          BRANCH
-            if: CALL 'public final fun not (): kotlin.Boolean declared in kotlin.Boolean' type=kotlin.Boolean origin=EXCLEQ
-              $this: CALL 'public final fun EQEQ (arg0: kotlin.Any?, arg1: kotlin.Any?): kotlin.Boolean declared in kotlin.internal.ir' type=kotlin.Boolean origin=EXCLEQ
-                arg0: 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 '<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 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'
-              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'
-          CONST Boolean type=kotlin.Boolean value=true
diff --git a/compiler/testData/ir/irText/declarations/inlineCollectionOfInlineClass.fir.kt.txt b/compiler/testData/ir/irText/declarations/inlineCollectionOfInlineClass.fir.kt.txt
deleted file mode 100644
index e82484e320a..00000000000
--- a/compiler/testData/ir/irText/declarations/inlineCollectionOfInlineClass.fir.kt.txt
+++ /dev/null
@@ -1,109 +0,0 @@
-value class IT {
-  constructor(x: Int) /* primary */ {
-    super/*Any*/()
-    /* <init>() */
-
-  }
-
-  val x: Int
-    field = x
-    get
-
-  override fun toString(): String {
-    return "IT(" + "x=" + <this>.#x + ")"
-  }
-
-  override fun hashCode(): Int {
-    return <this>.#x.hashCode()
-  }
-
-  override operator fun equals(other: Any?): Boolean {
-    when {
-      other !is IT -> return false
-    }
-    val tmp_0: IT = other as IT
-    when {
-      EQEQ(arg0 = <this>.#x, arg1 = tmp_0.#x).not() -> return false
-    }
-    return true
-  }
-
-}
-
-value class InlineMutableSet : MutableSet<IT> {
-  constructor(ms: MutableSet<IT>) /* primary */ {
-    super/*Any*/()
-    /* <init>() */
-
-  }
-
-  private val ms: MutableSet<IT>
-    field = ms
-    private get
-
-  override val size: Int
-    override get(): Int {
-      return <this>.<get-ms>().<get-size>()
-    }
-
-  override operator fun contains(element: IT): Boolean {
-    return <this>.<get-ms>().contains(element = element)
-  }
-
-  override fun containsAll(elements: Collection<IT>): Boolean {
-    return <this>.<get-ms>().containsAll(elements = elements)
-  }
-
-  override fun isEmpty(): Boolean {
-    return <this>.<get-ms>().isEmpty()
-  }
-
-  override fun add(element: IT): Boolean {
-    return <this>.<get-ms>().add(element = element)
-  }
-
-  override fun addAll(elements: Collection<IT>): Boolean {
-    return <this>.<get-ms>().addAll(elements = elements)
-  }
-
-  override fun clear() {
-    <this>.<get-ms>().clear()
-  }
-
-  override operator fun iterator(): MutableIterator<IT> {
-    return <this>.<get-ms>().iterator()
-  }
-
-  override fun remove(element: IT): Boolean {
-    return <this>.<get-ms>().remove(element = element)
-  }
-
-  override fun removeAll(elements: Collection<IT>): Boolean {
-    return <this>.<get-ms>().removeAll(elements = elements)
-  }
-
-  override fun retainAll(elements: Collection<IT>): Boolean {
-    return <this>.<get-ms>().retainAll(elements = elements)
-  }
-
-  override fun toString(): String {
-    return "InlineMutableSet(" + "ms=" + <this>.#ms + ")"
-  }
-
-  override fun hashCode(): Int {
-    return <this>.#ms.hashCode()
-  }
-
-  override operator fun equals(other: Any?): Boolean {
-    when {
-      other !is InlineMutableSet -> return false
-    }
-    val tmp_1: InlineMutableSet = other as InlineMutableSet
-    when {
-      EQEQ(arg0 = <this>.#ms, arg1 = tmp_1.#ms).not() -> return false
-    }
-    return true
-  }
-
-}
-
diff --git a/compiler/testData/ir/irText/declarations/inlineCollectionOfInlineClass.kt b/compiler/testData/ir/irText/declarations/inlineCollectionOfInlineClass.kt
index cea1ea376af..930b3b1928b 100644
--- a/compiler/testData/ir/irText/declarations/inlineCollectionOfInlineClass.kt
+++ b/compiler/testData/ir/irText/declarations/inlineCollectionOfInlineClass.kt
@@ -1,3 +1,7 @@
+// FIR_IDENTICAL
+// KT-64271
+// IGNORE_BACKEND_K2: JVM_IR
+
 inline class IT(val x: Int)
 
 inline class InlineMutableSet(private val ms: MutableSet<IT>) : MutableSet<IT> {
diff --git a/compiler/testData/ir/irText/declarations/multiplatform/k2/expectMemberInNotExpectClass.sig.kt.txt b/compiler/testData/ir/irText/declarations/multiplatform/k2/expectMemberInNotExpectClass.sig.kt.txt
index 85419d3100f..377ed075b46 100644
--- a/compiler/testData/ir/irText/declarations/multiplatform/k2/expectMemberInNotExpectClass.sig.kt.txt
+++ b/compiler/testData/ir/irText/declarations/multiplatform/k2/expectMemberInNotExpectClass.sig.kt.txt
@@ -17,16 +17,19 @@ class C2 : C1 {
   //   Public signature debug description: f(){}kotlin.String
   // CHECK JS_IR NATIVE:
   //   Mangled name: C2#f(){}
-  //   Mangled name for the signature: f(){}
   //   Public signature: /C2.f|5316533450599009716[0]
   //   Public signature debug description: f(){}
   /* fake */ override fun f(): String
 
-  // CHECK:
+  // CHECK JVM_IR:
   //   Mangled name: C2{}p
   //   Mangled name for the signature: {}p
   //   Public signature: /C2.p|6715504260787941082[0]
   //   Public signature debug description: {}p
+  // CHECK JS_IR NATIVE:
+  //   Mangled name: C2{}p
+  //   Public signature: /C2.p|6715504260787941082[0]
+  //   Public signature debug description: {}p
   /* fake */ override val p: Int
     // CHECK JVM_IR:
     //   Mangled name: C2#<get-p>(){}kotlin.Int
@@ -35,7 +38,6 @@ class C2 : C1 {
     //   Public signature debug description: <get-p>(){}kotlin.Int
     // CHECK JS_IR NATIVE:
     //   Mangled name: C2#<get-p>(){}
-    //   Mangled name for the signature: <get-p>(){}
     //   Public signature: /C2.p.<get-p>|-1162552463316289847[0]
     //   Public signature debug description: <get-p>(){}
     /* fake */ override get(): Int
diff --git a/compiler/testData/ir/irText/firProblems/SignatureClash.fir.ir.txt b/compiler/testData/ir/irText/firProblems/SignatureClash.fir.ir.txt
deleted file mode 100644
index a0e1d0e4c15..00000000000
--- a/compiler/testData/ir/irText/firProblems/SignatureClash.fir.ir.txt
+++ /dev/null
@@ -1,183 +0,0 @@
-FILE fqName:<root> fileName:/SignatureClash.kt
-  TYPEALIAS name:Some visibility:public expandedType:kotlin.Function1<kotlin.Any, kotlin.String?>
-  CLASS OBJECT name:Factory modality:FINAL visibility:public superTypes:[kotlin.Any]
-    $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:<root>.Factory
-    CONSTRUCTOR visibility:private <> () returnType:<root>.Factory [primary]
-      BLOCK_BODY
-        DELEGATING_CONSTRUCTOR_CALL 'public constructor <init> () declared in kotlin.Any'
-        INSTANCE_INITIALIZER_CALL classDescriptor='CLASS OBJECT name:Factory modality:FINAL visibility:public superTypes:[kotlin.Any]'
-    FUN name:foo visibility:public modality:FINAL <> ($this:<root>.Factory, a:kotlin.String) returnType:kotlin.String
-      $this: VALUE_PARAMETER name:<this> type:<root>.Factory
-      VALUE_PARAMETER name:a index:0 type:kotlin.String
-      BLOCK_BODY
-        RETURN type=kotlin.Nothing from='public final fun foo (a: kotlin.String): kotlin.String declared in <root>.Factory'
-          CONST String type=kotlin.String value="Alpha"
-    FUN name:foo visibility:public modality:FINAL <> ($this:<root>.Factory, a:kotlin.String, f:kotlin.Function1<kotlin.Any, kotlin.String?>) returnType:kotlin.String
-      $this: VALUE_PARAMETER name:<this> type:<root>.Factory
-      VALUE_PARAMETER name:a index:0 type:kotlin.String
-      VALUE_PARAMETER name:f index:1 type:kotlin.Function1<kotlin.Any, kotlin.String?>
-      BLOCK_BODY
-        RETURN type=kotlin.Nothing from='public final fun foo (a: kotlin.String, f: kotlin.Function1<kotlin.Any, kotlin.String?>): kotlin.String declared in <root>.Factory'
-          CONST String type=kotlin.String value="Omega"
-    FUN FAKE_OVERRIDE name:equals visibility:public modality:OPEN <> ($this:kotlin.Any, other:kotlin.Any?) returnType:kotlin.Boolean [fake_override,operator]
-      overridden:
-        public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in kotlin.Any
-      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
-      VALUE_PARAMETER name:other index:0 type:kotlin.Any?
-    FUN FAKE_OVERRIDE name:hashCode visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.Int [fake_override]
-      overridden:
-        public open fun hashCode (): kotlin.Int declared in kotlin.Any
-      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
-    FUN FAKE_OVERRIDE name:toString visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.String [fake_override]
-      overridden:
-        public open fun toString (): kotlin.String declared in kotlin.Any
-      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
-  CLASS INTERFACE name:Base modality:ABSTRACT visibility:public superTypes:[kotlin.Any]
-    $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:<root>.Base
-    FUN FAKE_OVERRIDE name:equals visibility:public modality:OPEN <> ($this:kotlin.Any, other:kotlin.Any?) returnType:kotlin.Boolean [fake_override,operator]
-      overridden:
-        public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in kotlin.Any
-      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
-      VALUE_PARAMETER name:other index:0 type:kotlin.Any?
-    FUN FAKE_OVERRIDE name:hashCode visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.Int [fake_override]
-      overridden:
-        public open fun hashCode (): kotlin.Int declared in kotlin.Any
-      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
-    FUN FAKE_OVERRIDE name:toString visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.String [fake_override]
-      overridden:
-        public open fun toString (): kotlin.String declared in kotlin.Any
-      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
-  CLASS INTERFACE name:Delegate modality:ABSTRACT visibility:public superTypes:[<root>.Base]
-    $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:<root>.Delegate
-    FUN name:bar visibility:public modality:ABSTRACT <> ($this:<root>.Delegate) returnType:kotlin.Unit
-      $this: VALUE_PARAMETER name:<this> type:<root>.Delegate
-    FUN FAKE_OVERRIDE name:equals visibility:public modality:OPEN <> ($this:kotlin.Any, other:kotlin.Any?) returnType:kotlin.Boolean [fake_override,operator]
-      overridden:
-        public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Base
-      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
-      VALUE_PARAMETER name:other index:0 type:kotlin.Any?
-    FUN FAKE_OVERRIDE name:hashCode visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.Int [fake_override]
-      overridden:
-        public open fun hashCode (): kotlin.Int declared in <root>.Base
-      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
-    FUN FAKE_OVERRIDE name:toString visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.String [fake_override]
-      overridden:
-        public open fun toString (): kotlin.String declared in <root>.Base
-      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
-  CLASS INTERFACE name:Derived modality:ABSTRACT visibility:public superTypes:[<root>.Delegate]
-    $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:<root>.Derived
-    FUN FAKE_OVERRIDE name:bar visibility:public modality:ABSTRACT <> ($this:<root>.Delegate) returnType:kotlin.Unit [fake_override]
-      overridden:
-        public abstract fun bar (): kotlin.Unit declared in <root>.Delegate
-      $this: VALUE_PARAMETER name:<this> type:<root>.Delegate
-    FUN FAKE_OVERRIDE name:equals visibility:public modality:OPEN <> ($this:kotlin.Any, other:kotlin.Any?) returnType:kotlin.Boolean [fake_override,operator]
-      overridden:
-        public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Delegate
-      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
-      VALUE_PARAMETER name:other index:0 type:kotlin.Any?
-    FUN FAKE_OVERRIDE name:hashCode visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.Int [fake_override]
-      overridden:
-        public open fun hashCode (): kotlin.Int declared in <root>.Delegate
-      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
-    FUN FAKE_OVERRIDE name:toString visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.String [fake_override]
-      overridden:
-        public open fun toString (): kotlin.String declared in <root>.Delegate
-      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
-  CLASS CLASS name:DataClass modality:FINAL visibility:public [data] superTypes:[<root>.Derived; <root>.Delegate]
-    $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:<root>.DataClass
-    CONSTRUCTOR visibility:public <> (delegate:<root>.Delegate) returnType:<root>.DataClass [primary]
-      VALUE_PARAMETER name:delegate index:0 type:<root>.Delegate
-      BLOCK_BODY
-        DELEGATING_CONSTRUCTOR_CALL 'public constructor <init> () declared in kotlin.Any'
-        INSTANCE_INITIALIZER_CALL classDescriptor='CLASS CLASS name:DataClass modality:FINAL visibility:public [data] superTypes:[<root>.Derived; <root>.Delegate]'
-    PROPERTY name:delegate visibility:public modality:FINAL [val]
-      FIELD PROPERTY_BACKING_FIELD name:delegate type:<root>.Delegate visibility:private [final]
-        EXPRESSION_BODY
-          GET_VAR 'delegate: <root>.Delegate declared in <root>.DataClass.<init>' type=<root>.Delegate origin=INITIALIZE_PROPERTY_FROM_PARAMETER
-      FUN DEFAULT_PROPERTY_ACCESSOR name:<get-delegate> visibility:public modality:FINAL <> ($this:<root>.DataClass) returnType:<root>.Delegate
-        correspondingProperty: PROPERTY name:delegate visibility:public modality:FINAL [val]
-        $this: VALUE_PARAMETER name:<this> type:<root>.DataClass
-        BLOCK_BODY
-          RETURN type=kotlin.Nothing from='public final fun <get-delegate> (): <root>.Delegate declared in <root>.DataClass'
-            GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:delegate type:<root>.Delegate visibility:private [final]' type=<root>.Delegate origin=null
-              receiver: GET_VAR '<this>: <root>.DataClass declared in <root>.DataClass.<get-delegate>' type=<root>.DataClass origin=null
-    FUN DELEGATED_MEMBER name:bar visibility:public modality:OPEN <> ($this:<root>.DataClass) returnType:kotlin.Unit
-      overridden:
-        public abstract fun bar (): kotlin.Unit declared in <root>.Derived
-        public abstract fun bar (): kotlin.Unit declared in <root>.Delegate
-      $this: VALUE_PARAMETER name:<this> type:<root>.DataClass
-      BLOCK_BODY
-        CALL 'public abstract fun bar (): kotlin.Unit declared in <root>.Delegate' type=kotlin.Unit origin=null
-          $this: GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:delegate type:<root>.Delegate visibility:private [final]' type=<root>.Delegate origin=null
-            receiver: GET_VAR '<this>: <root>.DataClass declared in <root>.DataClass.bar' type=<root>.DataClass origin=null
-    FUN GENERATED_DATA_CLASS_MEMBER name:component1 visibility:public modality:FINAL <> ($this:<root>.DataClass) returnType:<root>.Delegate [operator]
-      $this: VALUE_PARAMETER name:<this> type:<root>.DataClass
-      BLOCK_BODY
-        RETURN type=kotlin.Nothing from='public final fun component1 (): <root>.Delegate declared in <root>.DataClass'
-          GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:delegate type:<root>.Delegate visibility:private [final]' type=<root>.Delegate origin=null
-            receiver: GET_VAR '<this>: <root>.DataClass declared in <root>.DataClass.component1' type=<root>.DataClass origin=null
-    FUN GENERATED_DATA_CLASS_MEMBER name:copy visibility:public modality:FINAL <> ($this:<root>.DataClass, delegate:<root>.Delegate) returnType:<root>.DataClass
-      $this: VALUE_PARAMETER name:<this> type:<root>.DataClass
-      VALUE_PARAMETER name:delegate index:0 type:<root>.Delegate
-        EXPRESSION_BODY
-          GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:delegate type:<root>.Delegate visibility:private [final]' type=<root>.Delegate origin=null
-            receiver: GET_VAR '<this>: <root>.DataClass declared in <root>.DataClass.copy' type=<root>.DataClass origin=null
-      BLOCK_BODY
-        RETURN type=kotlin.Nothing from='public final fun copy (delegate: <root>.Delegate): <root>.DataClass declared in <root>.DataClass'
-          CONSTRUCTOR_CALL 'public constructor <init> (delegate: <root>.Delegate) declared in <root>.DataClass' type=<root>.DataClass origin=null
-            delegate: GET_VAR 'delegate: <root>.Delegate declared in <root>.DataClass.copy' type=<root>.Delegate origin=null
-    FUN GENERATED_DATA_CLASS_MEMBER name:toString visibility:public modality:OPEN <> ($this:<root>.DataClass) returnType:kotlin.String
-      overridden:
-        public open fun toString (): kotlin.String declared in kotlin.Any
-      $this: VALUE_PARAMETER name:<this> type:<root>.DataClass
-      BLOCK_BODY
-        RETURN type=kotlin.Nothing from='public open fun toString (): kotlin.String declared in <root>.DataClass'
-          STRING_CONCATENATION type=kotlin.String
-            CONST String type=kotlin.String value="DataClass("
-            CONST String type=kotlin.String value="delegate="
-            GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:delegate type:<root>.Delegate visibility:private [final]' type=<root>.Delegate origin=null
-              receiver: GET_VAR '<this>: <root>.DataClass declared in <root>.DataClass.toString' type=<root>.DataClass origin=null
-            CONST String type=kotlin.String value=")"
-    FUN GENERATED_DATA_CLASS_MEMBER name:hashCode visibility:public modality:OPEN <> ($this:<root>.DataClass) returnType:kotlin.Int
-      overridden:
-        public open fun hashCode (): kotlin.Int declared in kotlin.Any
-      $this: VALUE_PARAMETER 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 declared in <root>.Delegate' type=kotlin.Int origin=null
-            $this: GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:delegate type:<root>.Delegate visibility:private [final]' type=<root>.Delegate origin=null
-              receiver: GET_VAR '<this>: <root>.DataClass declared in <root>.DataClass.hashCode' type=<root>.DataClass origin=null
-    FUN GENERATED_DATA_CLASS_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.DataClass, other:kotlin.Any?) returnType:kotlin.Boolean [operator]
-      overridden:
-        public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in 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'
-              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'
-              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
-            GET_VAR 'other: kotlin.Any? declared in <root>.DataClass.equals' type=kotlin.Any? origin=null
-        WHEN type=kotlin.Unit origin=null
-          BRANCH
-            if: CALL 'public final fun not (): kotlin.Boolean declared in kotlin.Boolean' type=kotlin.Boolean origin=EXCLEQ
-              $this: CALL 'public final fun EQEQ (arg0: kotlin.Any?, arg1: kotlin.Any?): kotlin.Boolean declared in kotlin.internal.ir' type=kotlin.Boolean origin=EXCLEQ
-                arg0: GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:delegate type:<root>.Delegate visibility:private [final]' type=<root>.Delegate origin=null
-                  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 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'
-              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'
-          CONST Boolean type=kotlin.Boolean value=true
diff --git a/compiler/testData/ir/irText/firProblems/SignatureClash.fir.kt.txt b/compiler/testData/ir/irText/firProblems/SignatureClash.fir.kt.txt
deleted file mode 100644
index f938311fd47..00000000000
--- a/compiler/testData/ir/irText/firProblems/SignatureClash.fir.kt.txt
+++ /dev/null
@@ -1,76 +0,0 @@
-typealias Some = Function1<Any, String?>
-object Factory {
-  private constructor() /* primary */ {
-    super/*Any*/()
-    /* <init>() */
-
-  }
-
-  fun foo(a: String): String {
-    return "Alpha"
-  }
-
-  fun foo(a: String, f: Function1<Any, String?>): String {
-    return "Omega"
-  }
-
-}
-
-interface Base {
-}
-
-interface Delegate : Base {
-  abstract fun bar()
-
-}
-
-interface Derived : Delegate {
-}
-
-data class DataClass : Derived, Delegate {
-  constructor(delegate: Delegate) /* primary */ {
-    super/*Any*/()
-    /* <init>() */
-
-  }
-
-  val delegate: Delegate
-    field = delegate
-    get
-
-  override fun bar() {
-    <this>.#delegate.bar()
-  }
-
-  operator fun component1(): Delegate {
-    return <this>.#delegate
-  }
-
-  fun copy(delegate: Delegate = <this>.#delegate): DataClass {
-    return DataClass(delegate = delegate)
-  }
-
-  override fun toString(): String {
-    return "DataClass(" + "delegate=" + <this>.#delegate + ")"
-  }
-
-  override fun hashCode(): Int {
-    return <this>.#delegate.hashCode()
-  }
-
-  override operator fun equals(other: Any?): Boolean {
-    when {
-      EQEQEQ(arg0 = <this>, arg1 = other) -> return true
-    }
-    when {
-      other !is DataClass -> return false
-    }
-    val tmp_0: DataClass = other as DataClass
-    when {
-      EQEQ(arg0 = <this>.#delegate, arg1 = tmp_0.#delegate).not() -> return false
-    }
-    return true
-  }
-
-}
-
diff --git a/compiler/testData/ir/irText/firProblems/SignatureClash.kt b/compiler/testData/ir/irText/firProblems/SignatureClash.kt
index 25c71f0e8ef..b20aad05d00 100644
--- a/compiler/testData/ir/irText/firProblems/SignatureClash.kt
+++ b/compiler/testData/ir/irText/firProblems/SignatureClash.kt
@@ -1,3 +1,7 @@
+// FIR_IDENTICAL
+// KT-64271
+// IGNORE_BACKEND_K2: JVM_IR
+
 typealias Some = (Any) -> String?
 
 object Factory {
diff --git a/compiler/testData/ir/irText/js/external/kt38765.fir.ir.txt b/compiler/testData/ir/irText/js/external/kt38765.fir.ir.txt
index 14e86b1c4cd..bbce31c2cb8 100644
--- a/compiler/testData/ir/irText/js/external/kt38765.fir.ir.txt
+++ b/compiler/testData/ir/irText/js/external/kt38765.fir.ir.txt
@@ -136,16 +136,16 @@ FILE fqName:events fileName:/kt38765.kt
         overridden:
           public open fun toString (): kotlin.String declared in kotlin.Any
         $this: VALUE_PARAMETER name:<this> type:kotlin.Any
-    FUN FAKE_OVERRIDE name:equals visibility:public modality:OPEN <> ($this:kotlin.Any, other:kotlin.Any?) returnType:kotlin.Boolean [fake_override,operator]
+    FUN FAKE_OVERRIDE name:equals visibility:public modality:OPEN <> ($this:kotlin.Any, other:kotlin.Any?) returnType:kotlin.Boolean [external,fake_override,operator]
       overridden:
         public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in kotlin.Any
       $this: VALUE_PARAMETER name:<this> type:kotlin.Any
       VALUE_PARAMETER name:other index:0 type:kotlin.Any?
-    FUN FAKE_OVERRIDE name:hashCode visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.Int [fake_override]
+    FUN FAKE_OVERRIDE name:hashCode visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.Int [external,fake_override]
       overridden:
         public open fun hashCode (): kotlin.Int declared in kotlin.Any
       $this: VALUE_PARAMETER name:<this> type:kotlin.Any
-    FUN FAKE_OVERRIDE name:toString visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.String [fake_override]
+    FUN FAKE_OVERRIDE name:toString visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.String [external,fake_override]
       overridden:
         public open fun toString (): kotlin.String declared in kotlin.Any
       $this: VALUE_PARAMETER name:<this> type:kotlin.Any
diff --git a/compiler/testData/ir/irText/js/native/nativeNativeKotlin.fir.ir.txt b/compiler/testData/ir/irText/js/native/nativeNativeKotlin.fir.ir.txt
index 466745202b3..84ec5c879f8 100644
--- a/compiler/testData/ir/irText/js/native/nativeNativeKotlin.fir.ir.txt
+++ b/compiler/testData/ir/irText/js/native/nativeNativeKotlin.fir.ir.txt
@@ -7,16 +7,16 @@ FILE fqName:foo fileName:/nativeNativeKotlin.kt
         INSTANCE_INITIALIZER_CALL classDescriptor='CLASS CLASS name:A modality:OPEN visibility:public [external] superTypes:[kotlin.Any]'
     FUN name:foo visibility:public modality:FINAL <> ($this:foo.A) returnType:kotlin.String
       $this: VALUE_PARAMETER name:<this> type:foo.A
-    FUN FAKE_OVERRIDE name:equals visibility:public modality:OPEN <> ($this:kotlin.Any, other:kotlin.Any?) returnType:kotlin.Boolean [fake_override,operator]
+    FUN FAKE_OVERRIDE name:equals visibility:public modality:OPEN <> ($this:kotlin.Any, other:kotlin.Any?) returnType:kotlin.Boolean [external,fake_override,operator]
       overridden:
         public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in kotlin.Any
       $this: VALUE_PARAMETER name:<this> type:kotlin.Any
       VALUE_PARAMETER name:other index:0 type:kotlin.Any?
-    FUN FAKE_OVERRIDE name:hashCode visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.Int [fake_override]
+    FUN FAKE_OVERRIDE name:hashCode visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.Int [external,fake_override]
       overridden:
         public open fun hashCode (): kotlin.Int declared in kotlin.Any
       $this: VALUE_PARAMETER name:<this> type:kotlin.Any
-    FUN FAKE_OVERRIDE name:toString visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.String [fake_override]
+    FUN FAKE_OVERRIDE name:toString visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.String [external,fake_override]
       overridden:
         public open fun toString (): kotlin.String declared in kotlin.Any
       $this: VALUE_PARAMETER name:<this> type:kotlin.Any
@@ -28,20 +28,20 @@ FILE fqName:foo fileName:/nativeNativeKotlin.kt
         INSTANCE_INITIALIZER_CALL classDescriptor='CLASS CLASS name:B modality:OPEN visibility:public [external] superTypes:[foo.A]'
     FUN name:bar visibility:public modality:FINAL <> ($this:foo.B) returnType:kotlin.String
       $this: VALUE_PARAMETER name:<this> type:foo.B
-    FUN FAKE_OVERRIDE name:foo visibility:public modality:FINAL <> ($this:foo.A) returnType:kotlin.String [fake_override]
+    FUN FAKE_OVERRIDE name:foo visibility:public modality:FINAL <> ($this:foo.A) returnType:kotlin.String [external,fake_override]
       overridden:
         public final fun foo (): kotlin.String declared in foo.A
       $this: VALUE_PARAMETER name:<this> type:foo.A
-    FUN FAKE_OVERRIDE name:equals visibility:public modality:OPEN <> ($this:kotlin.Any, other:kotlin.Any?) returnType:kotlin.Boolean [fake_override,operator]
+    FUN FAKE_OVERRIDE name:equals visibility:public modality:OPEN <> ($this:kotlin.Any, other:kotlin.Any?) returnType:kotlin.Boolean [external,fake_override,operator]
       overridden:
         public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in foo.A
       $this: VALUE_PARAMETER name:<this> type:kotlin.Any
       VALUE_PARAMETER name:other index:0 type:kotlin.Any?
-    FUN FAKE_OVERRIDE name:hashCode visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.Int [fake_override]
+    FUN FAKE_OVERRIDE name:hashCode visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.Int [external,fake_override]
       overridden:
         public open fun hashCode (): kotlin.Int declared in foo.A
       $this: VALUE_PARAMETER name:<this> type:kotlin.Any
-    FUN FAKE_OVERRIDE name:toString visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.String [fake_override]
+    FUN FAKE_OVERRIDE name:toString visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.String [external,fake_override]
       overridden:
         public open fun toString (): kotlin.String declared in foo.A
       $this: VALUE_PARAMETER name:<this> type:kotlin.Any
diff --git a/compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/ir/ClassicJvmIrTextTestGenerated.java b/compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/ir/ClassicJvmIrTextTestGenerated.java
index 855b8b92afc..81c6623b5ed 100644
--- a/compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/ir/ClassicJvmIrTextTestGenerated.java
+++ b/compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/ir/ClassicJvmIrTextTestGenerated.java
@@ -280,6 +280,12 @@ public class ClassicJvmIrTextTestGenerated extends AbstractClassicJvmIrTextTest
             runTest("compiler/testData/ir/irText/classes/outerClassAccess.kt");
         }
 
+        @Test
+        @TestMetadata("overriddenEquals.kt")
+        public void testOverriddenEquals() throws Exception {
+            runTest("compiler/testData/ir/irText/classes/overriddenEquals.kt");
+        }
+
         @Test
         @TestMetadata("primaryConstructor.kt")
         public void testPrimaryConstructor() throws Exception {
diff --git a/compiler/tests-common-new/tests/org/jetbrains/kotlin/test/frontend/fir/Fir2IrResultsConverter.kt b/compiler/tests-common-new/tests/org/jetbrains/kotlin/test/frontend/fir/Fir2IrResultsConverter.kt
index 16a0dd0f3a9..5307e28f64c 100644
--- a/compiler/tests-common-new/tests/org/jetbrains/kotlin/test/frontend/fir/Fir2IrResultsConverter.kt
+++ b/compiler/tests-common-new/tests/org/jetbrains/kotlin/test/frontend/fir/Fir2IrResultsConverter.kt
@@ -5,6 +5,7 @@
 
 package org.jetbrains.kotlin.test.frontend.fir
 
+import org.jetbrains.kotlin.config.LanguageFeature
 import org.jetbrains.kotlin.platform.isCommon
 import org.jetbrains.kotlin.platform.isJs
 import org.jetbrains.kotlin.platform.jvm.isJvm
@@ -17,7 +18,7 @@ import org.jetbrains.kotlin.test.model.TestModule
 import org.jetbrains.kotlin.test.services.TestServices
 
 fun TestModule.shouldUseIrFakeOverrideBuilder(): Boolean {
-    return CodegenTestDirectives.ENABLE_IR_FAKE_OVERRIDE_GENERATION in directives
+    return !targetPlatform.isJvm() || CodegenTestDirectives.ENABLE_IR_FAKE_OVERRIDE_GENERATION in directives
 }
 
 class Fir2IrResultsConverter(
diff --git a/compiler/tests-gen/org/jetbrains/kotlin/klib/KlibIrTextTestCaseGenerated.java b/compiler/tests-gen/org/jetbrains/kotlin/klib/KlibIrTextTestCaseGenerated.java
index fde806cd5dc..a53103c709a 100644
--- a/compiler/tests-gen/org/jetbrains/kotlin/klib/KlibIrTextTestCaseGenerated.java
+++ b/compiler/tests-gen/org/jetbrains/kotlin/klib/KlibIrTextTestCaseGenerated.java
@@ -207,6 +207,11 @@ public class KlibIrTextTestCaseGenerated extends AbstractKlibIrTextTestCase {
             runTest("compiler/testData/ir/irText/classes/outerClassAccess.kt");
         }
 
+        @TestMetadata("overriddenEquals.kt")
+        public void testOverriddenEquals() throws Exception {
+            runTest("compiler/testData/ir/irText/classes/overriddenEquals.kt");
+        }
+
         @TestMetadata("primaryConstructor.kt")
         public void testPrimaryConstructor() throws Exception {
             runTest("compiler/testData/ir/irText/classes/primaryConstructor.kt");
diff --git a/js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/fir/FirLightTreeJsIrTextTestGenerated.java b/js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/fir/FirLightTreeJsIrTextTestGenerated.java
index d7b54ff102d..b3e0c843c5f 100644
--- a/js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/fir/FirLightTreeJsIrTextTestGenerated.java
+++ b/js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/fir/FirLightTreeJsIrTextTestGenerated.java
@@ -232,6 +232,12 @@ public class FirLightTreeJsIrTextTestGenerated extends AbstractFirLightTreeJsIrT
             runTest("compiler/testData/ir/irText/classes/outerClassAccess.kt");
         }
 
+        @Test
+        @TestMetadata("overriddenEquals.kt")
+        public void testOverriddenEquals() throws Exception {
+            runTest("compiler/testData/ir/irText/classes/overriddenEquals.kt");
+        }
+
         @Test
         @TestMetadata("primaryConstructor.kt")
         public void testPrimaryConstructor() throws Exception {
diff --git a/js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/fir/FirPsiJsIrTextTestGenerated.java b/js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/fir/FirPsiJsIrTextTestGenerated.java
index e0e96938eff..0d869e9023e 100644
--- a/js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/fir/FirPsiJsIrTextTestGenerated.java
+++ b/js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/fir/FirPsiJsIrTextTestGenerated.java
@@ -232,6 +232,12 @@ public class FirPsiJsIrTextTestGenerated extends AbstractFirPsiJsIrTextTest {
             runTest("compiler/testData/ir/irText/classes/outerClassAccess.kt");
         }
 
+        @Test
+        @TestMetadata("overriddenEquals.kt")
+        public void testOverriddenEquals() throws Exception {
+            runTest("compiler/testData/ir/irText/classes/overriddenEquals.kt");
+        }
+
         @Test
         @TestMetadata("primaryConstructor.kt")
         public void testPrimaryConstructor() throws Exception {
diff --git a/js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/ir/ClassicJsIrTextTestGenerated.java b/js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/ir/ClassicJsIrTextTestGenerated.java
index 68b5d57384f..1c9bf8e74bb 100644
--- a/js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/ir/ClassicJsIrTextTestGenerated.java
+++ b/js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/ir/ClassicJsIrTextTestGenerated.java
@@ -232,6 +232,12 @@ public class ClassicJsIrTextTestGenerated extends AbstractClassicJsIrTextTest {
             runTest("compiler/testData/ir/irText/classes/outerClassAccess.kt");
         }
 
+        @Test
+        @TestMetadata("overriddenEquals.kt")
+        public void testOverriddenEquals() throws Exception {
+            runTest("compiler/testData/ir/irText/classes/overriddenEquals.kt");
+        }
+
         @Test
         @TestMetadata("primaryConstructor.kt")
         public void testPrimaryConstructor() throws Exception {
diff --git a/kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/Fir2Ir.kt b/kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/Fir2Ir.kt
index 5d38fbd5707..7079e18c80a 100644
--- a/kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/Fir2Ir.kt
+++ b/kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/Fir2Ir.kt
@@ -106,7 +106,7 @@ internal fun PhaseContext.fir2Ir(
             inlineConstTracker = null,
             expectActualTracker = configuration[CommonConfigurationKeys.EXPECT_ACTUAL_TRACKER],
             allowNonCachedDeclarations = false,
-            useIrFakeOverrideBuilder = configuration.getBoolean(CommonConfigurationKeys.USE_IR_FAKE_OVERRIDE_BUILDER),
+            useIrFakeOverrideBuilder = true,
     )
     val (irModuleFragment, components, pluginContext, irActualizedResult) = input.firResult.convertToIrAndActualize(
             NativeFir2IrExtensions,
diff --git a/native/native.tests/tests-gen/org/jetbrains/kotlin/konan/test/irtext/ClassicNativeIrTextTestGenerated.java b/native/native.tests/tests-gen/org/jetbrains/kotlin/konan/test/irtext/ClassicNativeIrTextTestGenerated.java
index 1efba3c0d24..462032ac42b 100644
--- a/native/native.tests/tests-gen/org/jetbrains/kotlin/konan/test/irtext/ClassicNativeIrTextTestGenerated.java
+++ b/native/native.tests/tests-gen/org/jetbrains/kotlin/konan/test/irtext/ClassicNativeIrTextTestGenerated.java
@@ -232,6 +232,12 @@ public class ClassicNativeIrTextTestGenerated extends AbstractClassicNativeIrTex
             runTest("compiler/testData/ir/irText/classes/outerClassAccess.kt");
         }
 
+        @Test
+        @TestMetadata("overriddenEquals.kt")
+        public void testOverriddenEquals() throws Exception {
+            runTest("compiler/testData/ir/irText/classes/overriddenEquals.kt");
+        }
+
         @Test
         @TestMetadata("primaryConstructor.kt")
         public void testPrimaryConstructor() throws Exception {
diff --git a/native/native.tests/tests-gen/org/jetbrains/kotlin/konan/test/irtext/FirLightTreeNativeIrTextTestGenerated.java b/native/native.tests/tests-gen/org/jetbrains/kotlin/konan/test/irtext/FirLightTreeNativeIrTextTestGenerated.java
index 149a1b715f4..288ea27961f 100644
--- a/native/native.tests/tests-gen/org/jetbrains/kotlin/konan/test/irtext/FirLightTreeNativeIrTextTestGenerated.java
+++ b/native/native.tests/tests-gen/org/jetbrains/kotlin/konan/test/irtext/FirLightTreeNativeIrTextTestGenerated.java
@@ -232,6 +232,12 @@ public class FirLightTreeNativeIrTextTestGenerated extends AbstractFirLightTreeN
             runTest("compiler/testData/ir/irText/classes/outerClassAccess.kt");
         }
 
+        @Test
+        @TestMetadata("overriddenEquals.kt")
+        public void testOverriddenEquals() throws Exception {
+            runTest("compiler/testData/ir/irText/classes/overriddenEquals.kt");
+        }
+
         @Test
         @TestMetadata("primaryConstructor.kt")
         public void testPrimaryConstructor() throws Exception {
diff --git a/native/native.tests/tests-gen/org/jetbrains/kotlin/konan/test/irtext/FirPsiNativeIrTextTestGenerated.java b/native/native.tests/tests-gen/org/jetbrains/kotlin/konan/test/irtext/FirPsiNativeIrTextTestGenerated.java
index baa208a7956..44aec18db3a 100644
--- a/native/native.tests/tests-gen/org/jetbrains/kotlin/konan/test/irtext/FirPsiNativeIrTextTestGenerated.java
+++ b/native/native.tests/tests-gen/org/jetbrains/kotlin/konan/test/irtext/FirPsiNativeIrTextTestGenerated.java
@@ -232,6 +232,12 @@ public class FirPsiNativeIrTextTestGenerated extends AbstractFirPsiNativeIrTextT
             runTest("compiler/testData/ir/irText/classes/outerClassAccess.kt");
         }
 
+        @Test
+        @TestMetadata("overriddenEquals.kt")
+        public void testOverriddenEquals() throws Exception {
+            runTest("compiler/testData/ir/irText/classes/overriddenEquals.kt");
+        }
+
         @Test
         @TestMetadata("primaryConstructor.kt")
         public void testPrimaryConstructor() throws Exception {