diff --git a/compiler/fir/analysis-tests/tests-gen/org/jetbrains/kotlin/test/runners/FirOldFrontendMPPDiagnosticsWithLightTreeTestGenerated.java b/compiler/fir/analysis-tests/tests-gen/org/jetbrains/kotlin/test/runners/FirOldFrontendMPPDiagnosticsWithLightTreeTestGenerated.java
index 41947b661bb..e67a6b1fe13 100644
--- a/compiler/fir/analysis-tests/tests-gen/org/jetbrains/kotlin/test/runners/FirOldFrontendMPPDiagnosticsWithLightTreeTestGenerated.java
+++ b/compiler/fir/analysis-tests/tests-gen/org/jetbrains/kotlin/test/runners/FirOldFrontendMPPDiagnosticsWithLightTreeTestGenerated.java
@@ -652,6 +652,12 @@ public class FirOldFrontendMPPDiagnosticsWithLightTreeTestGenerated extends Abst
             runTest("compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/nestedExpectOpenClass.kt");
         }
 
+        @Test
+        @TestMetadata("overloadMethodInjectedInSuper.kt")
+        public void testOverloadMethodInjectedInSuper() throws Exception {
+            runTest("compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/overloadMethodInjectedInSuper.kt");
+        }
+
         @Test
         @TestMetadata("propertyKindOverride.kt")
         public void testPropertyKindOverride() throws Exception {
diff --git a/compiler/fir/analysis-tests/tests-gen/org/jetbrains/kotlin/test/runners/FirOldFrontendMPPDiagnosticsWithPsiTestGenerated.java b/compiler/fir/analysis-tests/tests-gen/org/jetbrains/kotlin/test/runners/FirOldFrontendMPPDiagnosticsWithPsiTestGenerated.java
index cf13fa97341..2f917c35f21 100644
--- a/compiler/fir/analysis-tests/tests-gen/org/jetbrains/kotlin/test/runners/FirOldFrontendMPPDiagnosticsWithPsiTestGenerated.java
+++ b/compiler/fir/analysis-tests/tests-gen/org/jetbrains/kotlin/test/runners/FirOldFrontendMPPDiagnosticsWithPsiTestGenerated.java
@@ -652,6 +652,12 @@ public class FirOldFrontendMPPDiagnosticsWithPsiTestGenerated extends AbstractFi
             runTest("compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/nestedExpectOpenClass.kt");
         }
 
+        @Test
+        @TestMetadata("overloadMethodInjectedInSuper.kt")
+        public void testOverloadMethodInjectedInSuper() throws Exception {
+            runTest("compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/overloadMethodInjectedInSuper.kt");
+        }
+
         @Test
         @TestMetadata("propertyKindOverride.kt")
         public void testPropertyKindOverride() throws Exception {
diff --git a/compiler/frontend/src/org/jetbrains/kotlin/diagnostics/Errors.java b/compiler/frontend/src/org/jetbrains/kotlin/diagnostics/Errors.java
index 7eecc8b0114..0c432d2d911 100644
--- a/compiler/frontend/src/org/jetbrains/kotlin/diagnostics/Errors.java
+++ b/compiler/frontend/src/org/jetbrains/kotlin/diagnostics/Errors.java
@@ -840,8 +840,6 @@ public interface Errors {
     DiagnosticFactory3<KtClassLikeDeclaration, ClassifierDescriptorWithTypeParameters, Set<K1ExpectActualMemberDiff<CallableMemberDescriptor, ClassDescriptor>>, ClassDescriptor>
             ACTUAL_CLASSIFIER_MUST_HAVE_THE_SAME_MEMBERS_AS_NON_FINAL_EXPECT_CLASSIFIER_WARNING =
             DiagnosticFactory3.create(WARNING, DECLARATION_NAME);
-    DiagnosticFactory1<KtCallableDeclaration, K1ExpectActualMemberDiff<CallableMemberDescriptor, ClassDescriptor>>
-            NON_ACTUAL_MEMBER_DECLARED_IN_EXPECT_NON_FINAL_CLASSIFIER_ACTUALIZATION_WARNING = DiagnosticFactory1.create(WARNING, DECLARATION_NAME);
     DiagnosticFactory1<KtCallableDeclaration, K1ExpectActualMemberDiff<CallableMemberDescriptor, ClassDescriptor>>
             UNKNOWN_PROBLEM_DURING_NON_FINAL_CLASSIFIER_ACTUALIZATION_WARNING = DiagnosticFactory1.create(WARNING, DECLARATION_NAME);
     DiagnosticFactory1<KtCallableDeclaration, K1ExpectActualMemberDiff<CallableMemberDescriptor, ClassDescriptor>>
diff --git a/compiler/frontend/src/org/jetbrains/kotlin/diagnostics/rendering/DefaultErrorMessages.java b/compiler/frontend/src/org/jetbrains/kotlin/diagnostics/rendering/DefaultErrorMessages.java
index a49300d1241..54e0fedff43 100644
--- a/compiler/frontend/src/org/jetbrains/kotlin/diagnostics/rendering/DefaultErrorMessages.java
+++ b/compiler/frontend/src/org/jetbrains/kotlin/diagnostics/rendering/DefaultErrorMessages.java
@@ -403,9 +403,6 @@ public class DefaultErrorMessages {
                 CAPITALIZED_DECLARATION_NAME_WITH_KIND_AND_PLATFORM,
                 ExpectActualScopeDiffsRenderer.TEXT,
                 NAME);
-        MAP.put(NON_ACTUAL_MEMBER_DECLARED_IN_EXPECT_NON_FINAL_CLASSIFIER_ACTUALIZATION_WARNING,
-                "{0}. This warning will become an error in future releases. Also see https://youtrack.jetbrains.com/issue/KT-22841 for more details",
-                ExpectActualScopeDiffRenderer.INSTANCE);
         MAP.put(UNKNOWN_PROBLEM_DURING_NON_FINAL_CLASSIFIER_ACTUALIZATION_WARNING,
                 "{0}. This warning will become an error in future releases. Also see https://youtrack.jetbrains.com/issue/KT-22841 for more details",
                 ExpectActualScopeDiffRenderer.INSTANCE);
diff --git a/compiler/frontend/src/org/jetbrains/kotlin/resolve/checkers/ActualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker.kt b/compiler/frontend/src/org/jetbrains/kotlin/resolve/checkers/ActualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker.kt
index db266c56b38..8b40fdfeeda 100644
--- a/compiler/frontend/src/org/jetbrains/kotlin/resolve/checkers/ActualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker.kt
+++ b/compiler/frontend/src/org/jetbrains/kotlin/resolve/checkers/ActualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker.kt
@@ -9,13 +9,8 @@ import org.jetbrains.kotlin.config.LanguageFeature
 import org.jetbrains.kotlin.descriptors.*
 import org.jetbrains.kotlin.diagnostics.Errors
 import org.jetbrains.kotlin.incremental.components.NoLookupLocation
-import org.jetbrains.kotlin.name.FqName
 import org.jetbrains.kotlin.psi.*
 import org.jetbrains.kotlin.resolve.BindingTrace
-import org.jetbrains.kotlin.resolve.multiplatform.K1AbstractExpectActualCompatibilityChecker
-import org.jetbrains.kotlin.resolve.descriptorUtil.fqNameSafe
-import org.jetbrains.kotlin.resolve.descriptorUtil.getSuperClassNotAny
-import org.jetbrains.kotlin.resolve.descriptorUtil.getSuperInterfaces
 import org.jetbrains.kotlin.resolve.descriptorUtil.module
 import org.jetbrains.kotlin.resolve.multiplatform.*
 import org.jetbrains.kotlin.resolve.scopes.MemberScope
@@ -130,7 +125,7 @@ private fun calculateExpectActualScopeDiff(
     return actualClassCallables.flatMap { actualMember ->
         val potentialExpects = nameAndKindToExpectCallables[actualMember.name to actualMember.functionVsPropertyKind]
         if (potentialExpects.isNullOrEmpty()) {
-            listOf(K1ExpectActualMemberDiff.Kind.NonPrivateCallableAdded)
+            emptyList<K1ExpectActualMemberDiff.Kind>()
         } else {
             potentialExpects
                 .map { expectMember ->
@@ -145,9 +140,19 @@ private fun calculateExpectActualScopeDiff(
                 }
                 .takeIf { kinds -> kinds.all { it != K1ExpectActualCompatibility.Compatible } }
                 .orEmpty()
-                .map {
+                .mapNotNull {
                     when (it) {
                         is K1ExpectActualCompatibility.Compatible -> error("Compatible was filtered out by takeIf")
+                        K1ExpectActualCompatibility.Incompatible.CallableKind,
+                        K1ExpectActualCompatibility.Incompatible.ParameterCount,
+                        K1ExpectActualCompatibility.Incompatible.ParameterShape,
+                        K1ExpectActualCompatibility.Incompatible.ParameterTypes,
+                        K1ExpectActualCompatibility.Incompatible.FunctionTypeParameterCount,
+                        K1ExpectActualCompatibility.Incompatible.FunctionTypeParameterUpperBounds,
+                            // Don't report "matching" (aka "strong") incompatibilities, because it's
+                            // incompatibilities that happen only when a new member added
+                        -> null
+
                         is K1ExpectActualCompatibility.Incompatible -> it.toMemberDiffKind()
                         // If toMemberDiffKind returns null then some Kotlin invariants described in toMemberDiffKind no longer hold.
                         // We can't throw exception here because it would crash the compilation.
@@ -184,8 +189,6 @@ private val CallableMemberDescriptor.psiIfReal: KtCallableDeclaration?
 private fun BindingTrace.reportIfPossible(diff: K1ExpectActualMemberDiff<CallableMemberDescriptor, ClassDescriptor>) {
     val psi = diff.actualMember.psiIfReal ?: return
     val diagnostic = when (diff.kind) {
-        K1ExpectActualMemberDiff.Kind.NonPrivateCallableAdded ->
-            Errors.NON_ACTUAL_MEMBER_DECLARED_IN_EXPECT_NON_FINAL_CLASSIFIER_ACTUALIZATION_WARNING.on(psi, diff)
         K1ExpectActualMemberDiff.Kind.ReturnTypeChangedInOverride ->
             Errors.RETURN_TYPE_CHANGED_IN_NON_FINAL_EXPECT_CLASSIFIER_ACTUALIZATION_WARNING.on(psi, diff)
         K1ExpectActualMemberDiff.Kind.ModalityChangedInOverride ->
diff --git a/compiler/resolution/src/org/jetbrains/kotlin/resolve/multiplatform/K1ExpectActualMemberDiff.kt b/compiler/resolution/src/org/jetbrains/kotlin/resolve/multiplatform/K1ExpectActualMemberDiff.kt
index d28c7469932..04be55c395e 100644
--- a/compiler/resolution/src/org/jetbrains/kotlin/resolve/multiplatform/K1ExpectActualMemberDiff.kt
+++ b/compiler/resolution/src/org/jetbrains/kotlin/resolve/multiplatform/K1ExpectActualMemberDiff.kt
@@ -13,10 +13,6 @@ data class K1ExpectActualMemberDiff<out M, out C>(val kind: Kind, val actualMemb
      * Also see: [toMemberDiffKind]
      */
     enum class Kind(val rawMessage: String) {
-        NonPrivateCallableAdded(
-            "{0}: non-private member must be declared in both the actual class and the expect class. " +
-                    "This error happens because the expect class ''{1}'' is non-final"
-        ),
         ReturnTypeChangedInOverride(
             "{0}: the return type of this member must be the same in the expect class and the actual class. " +
                     "This error happens because the expect class ''{1}'' is non-final"
@@ -61,14 +57,19 @@ data class K1ExpectActualMemberDiff<out M, out C>(val kind: Kind, val actualMemb
 }
 
 fun K1ExpectActualCompatibility.Incompatible<*>.toMemberDiffKind(): K1ExpectActualMemberDiff.Kind? = when (this) {
-    K1ExpectActualCompatibility.Incompatible.CallableKind -> K1ExpectActualMemberDiff.Kind.NonPrivateCallableAdded
-    K1ExpectActualCompatibility.Incompatible.ParameterCount -> K1ExpectActualMemberDiff.Kind.NonPrivateCallableAdded
-    K1ExpectActualCompatibility.Incompatible.ParameterShape -> K1ExpectActualMemberDiff.Kind.NonPrivateCallableAdded
-    K1ExpectActualCompatibility.Incompatible.ParameterTypes -> K1ExpectActualMemberDiff.Kind.NonPrivateCallableAdded
+    K1ExpectActualCompatibility.Incompatible.CallableKind,
+    K1ExpectActualCompatibility.Incompatible.ParameterCount,
+    K1ExpectActualCompatibility.Incompatible.ParameterShape,
+    K1ExpectActualCompatibility.Incompatible.ParameterTypes,
+    K1ExpectActualCompatibility.Incompatible.FunctionTypeParameterCount,
+    K1ExpectActualCompatibility.Incompatible.FunctionTypeParameterUpperBounds,
+        // It's an awful API. But we don't care because it's in K1. And K1 won't ever change anymore
+        // I could have created a nice API (replace K1ExpectActualCompatibility.Incompatible extension receiver with WeakIncompatible),
+        // if we didn't have this bug: KT-62752
+    -> error("It's not allowed to call this function with receiver: $this")
+
     K1ExpectActualCompatibility.Incompatible.ReturnType -> K1ExpectActualMemberDiff.Kind.ReturnTypeChangedInOverride
-    K1ExpectActualCompatibility.Incompatible.FunctionTypeParameterCount -> K1ExpectActualMemberDiff.Kind.NonPrivateCallableAdded
     K1ExpectActualCompatibility.Incompatible.ClassTypeParameterCount -> error("Not applicable because K1ExpectActualMemberDiff is about members")
-    K1ExpectActualCompatibility.Incompatible.FunctionTypeParameterUpperBounds -> K1ExpectActualMemberDiff.Kind.NonPrivateCallableAdded
     K1ExpectActualCompatibility.Incompatible.ClassTypeParameterUpperBounds -> error("Not applicable because K1ExpectActualMemberDiff is about members")
     K1ExpectActualCompatibility.Incompatible.ActualFunctionWithDefaultParameters -> null // It's not possible to add default parameters in override
     K1ExpectActualCompatibility.Incompatible.ClassKind -> error("Not applicable because K1ExpectActualMemberDiff is about members")
diff --git a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/actualTypealias.fir.kt b/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/actualTypealias.fir.kt
deleted file mode 100644
index 9e5b081224b..00000000000
--- a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/actualTypealias.fir.kt
+++ /dev/null
@@ -1,19 +0,0 @@
-// MODULE: m1-common
-// FILE: common.kt
-
-expect open class Foo {
-    fun existingMethod()
-    val existingParam: Int
-}
-
-// MODULE: m2-jvm()()(m1-common)
-// FILE: jvm.kt
-
-actual typealias Foo = FooImpl
-
-open class FooImpl {
-    fun existingMethod() {}
-    val existingParam: Int = 904
-
-    fun injectedMethod() {} // accidential override can happen with this injected fun. That's why it's prohibited
-}
diff --git a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/actualTypealias.kt b/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/actualTypealias.kt
index 7df04872307..180e22849d8 100644
--- a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/actualTypealias.kt
+++ b/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/actualTypealias.kt
@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 // MODULE: m1-common
 // FILE: common.kt
 
@@ -9,11 +10,11 @@ expect open class Foo {
 // MODULE: m2-jvm()()(m1-common)
 // FILE: jvm.kt
 
-actual typealias <!ACTUAL_CLASSIFIER_MUST_HAVE_THE_SAME_MEMBERS_AS_NON_FINAL_EXPECT_CLASSIFIER_WARNING!>Foo<!> = FooImpl
+actual typealias Foo = FooImpl
 
 open class FooImpl {
     fun existingMethod() {}
     val existingParam: Int = 904
 
-    fun injectedMethod() {} // accidential override can happen with this injected fun. That's why it's prohibited
+    fun injectedMethod() {}
 }
diff --git a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/injectExtensionReceiverOverload.fir.kt b/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/injectExtensionReceiverOverload.fir.kt
deleted file mode 100644
index 10dbaedf6e8..00000000000
--- a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/injectExtensionReceiverOverload.fir.kt
+++ /dev/null
@@ -1,15 +0,0 @@
-// MODULE: m1-common
-// FILE: common.kt
-
-expect open class Foo {
-    fun foo()
-}
-
-// MODULE: m2-jvm()()(m1-common)
-// FILE: jvm.kt
-
-actual open class Foo {
-    actual fun foo() {}
-
-    fun Int.foo() {} // accidential override can happen with this injected fun. That's why it's prohibited
-}
diff --git a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/injectExtensionReceiverOverload.kt b/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/injectExtensionReceiverOverload.kt
index 049505eb96b..7992108e8fc 100644
--- a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/injectExtensionReceiverOverload.kt
+++ b/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/injectExtensionReceiverOverload.kt
@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 // MODULE: m1-common
 // FILE: common.kt
 
@@ -8,8 +9,8 @@ expect open class Foo {
 // MODULE: m2-jvm()()(m1-common)
 // FILE: jvm.kt
 
-actual open <!ACTUAL_CLASSIFIER_MUST_HAVE_THE_SAME_MEMBERS_AS_NON_FINAL_EXPECT_CLASSIFIER_WARNING!>class Foo<!> {
+actual open class Foo {
     actual fun foo() {}
 
-    fun Int.<!NON_ACTUAL_MEMBER_DECLARED_IN_EXPECT_NON_FINAL_CLASSIFIER_ACTUALIZATION_WARNING!>foo<!>() {} // accidential override can happen with this injected fun. That's why it's prohibited
+    fun Int.foo() {}
 }
diff --git a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/injectGenericUpperBoundOverload.fir.kt b/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/injectGenericUpperBoundOverload.fir.kt
deleted file mode 100644
index 52d59aeab30..00000000000
--- a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/injectGenericUpperBoundOverload.fir.kt
+++ /dev/null
@@ -1,15 +0,0 @@
-// MODULE: m1-common
-// FILE: common.kt
-
-open class Base {
-    fun <T> foo(t: T) {}
-}
-
-expect open class Foo : Base
-
-// MODULE: m2-jvm()()(m1-common)
-// FILE: jvm.kt
-
-actual open class Foo : Base() {
-    fun <T : Comparable<T>> foo(t: T) {}
-}
diff --git a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/injectGenericUpperBoundOverload.kt b/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/injectGenericUpperBoundOverload.kt
index e782bff7994..01c2b38c8b4 100644
--- a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/injectGenericUpperBoundOverload.kt
+++ b/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/injectGenericUpperBoundOverload.kt
@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 // MODULE: m1-common
 // FILE: common.kt
 
@@ -10,6 +11,6 @@ expect open class Foo : Base
 // MODULE: m2-jvm()()(m1-common)
 // FILE: jvm.kt
 
-actual open <!ACTUAL_CLASSIFIER_MUST_HAVE_THE_SAME_MEMBERS_AS_NON_FINAL_EXPECT_CLASSIFIER_WARNING!>class Foo<!> : Base() {
-    fun <T : Comparable<T>> <!NON_ACTUAL_MEMBER_DECLARED_IN_EXPECT_NON_FINAL_CLASSIFIER_ACTUALIZATION_WARNING!>foo<!>(t: T) {}
+actual open class Foo : Base() {
+    fun <T : Comparable<T>> foo(t: T) {}
 }
diff --git a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/injectMethod_internalMethod.fir.kt b/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/injectMethod_internalMethod.fir.kt
deleted file mode 100644
index b3a8e7fac15..00000000000
--- a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/injectMethod_internalMethod.fir.kt
+++ /dev/null
@@ -1,17 +0,0 @@
-// MODULE: m1-common
-// FILE: common.kt
-
-expect open class Foo {
-    fun existingMethod()
-    val existingParam: Int
-}
-
-// MODULE: m2-jvm()()(m1-common)
-// FILE: jvm.kt
-
-actual open class Foo {
-    actual fun existingMethod() {}
-    actual val existingParam: Int = 904
-
-    internal fun injectedMethod() {} // accidential override can happen with this injected fun. That's why it's prohibited
-}
diff --git a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/injectMethod_internalMethod.kt b/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/injectMethod_internalMethod.kt
index b6a6205aa3b..e57d8a0b600 100644
--- a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/injectMethod_internalMethod.kt
+++ b/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/injectMethod_internalMethod.kt
@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 // MODULE: m1-common
 // FILE: common.kt
 
@@ -9,9 +10,9 @@ expect open class Foo {
 // MODULE: m2-jvm()()(m1-common)
 // FILE: jvm.kt
 
-actual open <!ACTUAL_CLASSIFIER_MUST_HAVE_THE_SAME_MEMBERS_AS_NON_FINAL_EXPECT_CLASSIFIER_WARNING!>class Foo<!> {
+actual open class Foo {
     actual fun existingMethod() {}
     actual val existingParam: Int = 904
 
-    internal fun <!NON_ACTUAL_MEMBER_DECLARED_IN_EXPECT_NON_FINAL_CLASSIFIER_ACTUALIZATION_WARNING!>injectedMethod<!>() {} // accidential override can happen with this injected fun. That's why it's prohibited
+    internal fun injectedMethod() {}
 }
diff --git a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/injectMethod_protectedMethod.fir.kt b/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/injectMethod_protectedMethod.fir.kt
deleted file mode 100644
index 3f2c5cabcb9..00000000000
--- a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/injectMethod_protectedMethod.fir.kt
+++ /dev/null
@@ -1,17 +0,0 @@
-// MODULE: m1-common
-// FILE: common.kt
-
-expect open class Foo {
-    fun existingMethod()
-    val existingParam: Int
-}
-
-// MODULE: m2-jvm()()(m1-common)
-// FILE: jvm.kt
-
-actual open class Foo {
-    actual fun existingMethod() {}
-    actual val existingParam: Int = 904
-
-    protected fun injectedMethod() {} // accidential override can happen with this injected fun. That's why it's prohibited
-}
diff --git a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/injectMethod_protectedMethod.kt b/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/injectMethod_protectedMethod.kt
index 0858a83b35c..19a5d8f9c6d 100644
--- a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/injectMethod_protectedMethod.kt
+++ b/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/injectMethod_protectedMethod.kt
@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 // MODULE: m1-common
 // FILE: common.kt
 
@@ -9,9 +10,9 @@ expect open class Foo {
 // MODULE: m2-jvm()()(m1-common)
 // FILE: jvm.kt
 
-actual open <!ACTUAL_CLASSIFIER_MUST_HAVE_THE_SAME_MEMBERS_AS_NON_FINAL_EXPECT_CLASSIFIER_WARNING!>class Foo<!> {
+actual open class Foo {
     actual fun existingMethod() {}
     actual val existingParam: Int = 904
 
-    protected fun <!NON_ACTUAL_MEMBER_DECLARED_IN_EXPECT_NON_FINAL_CLASSIFIER_ACTUALIZATION_WARNING!>injectedMethod<!>() {} // accidential override can happen with this injected fun. That's why it's prohibited
+    protected fun injectedMethod() {}
 }
diff --git a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/injectMethod_publicMethod.fir.kt b/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/injectMethod_publicMethod.fir.kt
deleted file mode 100644
index 2c01e6b739e..00000000000
--- a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/injectMethod_publicMethod.fir.kt
+++ /dev/null
@@ -1,17 +0,0 @@
-// MODULE: m1-common
-// FILE: common.kt
-
-expect open class Foo {
-    fun existingMethod()
-    val existingParam: Int
-}
-
-// MODULE: m2-jvm()()(m1-common)
-// FILE: jvm.kt
-
-actual open class Foo {
-    actual fun existingMethod() {}
-    actual val existingParam: Int = 904
-
-    fun injectedMethod() {} // accidential override can happen with this injected fun. That's why it's prohibited
-}
diff --git a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/injectMethod_publicMethod.kt b/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/injectMethod_publicMethod.kt
index 9f3bdd8fc21..3e46cbc5388 100644
--- a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/injectMethod_publicMethod.kt
+++ b/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/injectMethod_publicMethod.kt
@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 // MODULE: m1-common
 // FILE: common.kt
 
@@ -9,9 +10,9 @@ expect open class Foo {
 // MODULE: m2-jvm()()(m1-common)
 // FILE: jvm.kt
 
-actual open <!ACTUAL_CLASSIFIER_MUST_HAVE_THE_SAME_MEMBERS_AS_NON_FINAL_EXPECT_CLASSIFIER_WARNING!>class Foo<!> {
+actual open class Foo {
     actual fun existingMethod() {}
     actual val existingParam: Int = 904
 
-    fun <!NON_ACTUAL_MEMBER_DECLARED_IN_EXPECT_NON_FINAL_CLASSIFIER_ACTUALIZATION_WARNING!>injectedMethod<!>() {} // accidential override can happen with this injected fun. That's why it's prohibited
+    fun injectedMethod() {}
 }
diff --git a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/injectMethod_publicMethodInJava.fir.kt b/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/injectMethod_publicMethodInJava.fir.kt
deleted file mode 100644
index b5cdadf779c..00000000000
--- a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/injectMethod_publicMethodInJava.fir.kt
+++ /dev/null
@@ -1,19 +0,0 @@
-// MODULE: m1-common
-// FILE: common.kt
-
-expect open class Foo {
-    fun existingMethod()
-}
-
-// MODULE: m2-jvm()()(m1-common)
-// FILE: jvm.kt
-
-actual typealias Foo = FooImpl
-
-// FILE: Foo.java
-
-public class FooImpl {
-    public void existingMethod() {}
-
-    public void injectedMethod() {}
-}
diff --git a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/injectMethod_publicMethodInJava.kt b/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/injectMethod_publicMethodInJava.kt
index 273322cdf69..9d3df197af1 100644
--- a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/injectMethod_publicMethodInJava.kt
+++ b/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/injectMethod_publicMethodInJava.kt
@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 // MODULE: m1-common
 // FILE: common.kt
 
@@ -8,7 +9,7 @@ expect open class Foo {
 // MODULE: m2-jvm()()(m1-common)
 // FILE: jvm.kt
 
-actual typealias <!ACTUAL_CLASSIFIER_MUST_HAVE_THE_SAME_MEMBERS_AS_NON_FINAL_EXPECT_CLASSIFIER_WARNING!>Foo<!> = FooImpl
+actual typealias Foo = FooImpl
 
 // FILE: Foo.java
 
diff --git a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/injectParameterOverload.fir.kt b/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/injectParameterOverload.fir.kt
deleted file mode 100644
index adb9cd60668..00000000000
--- a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/injectParameterOverload.fir.kt
+++ /dev/null
@@ -1,15 +0,0 @@
-// MODULE: m1-common
-// FILE: common.kt
-
-expect open class Foo {
-    fun foo()
-}
-
-// MODULE: m2-jvm()()(m1-common)
-// FILE: jvm.kt
-
-actual open class Foo {
-    actual fun foo() {}
-
-    fun foo(overloaded: Int) {} // accidential override can happen with this injected fun. That's why it's prohibited
-}
diff --git a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/injectParameterOverload.kt b/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/injectParameterOverload.kt
index b3141736b9c..cc8f20f21ec 100644
--- a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/injectParameterOverload.kt
+++ b/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/injectParameterOverload.kt
@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 // MODULE: m1-common
 // FILE: common.kt
 
@@ -8,8 +9,8 @@ expect open class Foo {
 // MODULE: m2-jvm()()(m1-common)
 // FILE: jvm.kt
 
-actual open <!ACTUAL_CLASSIFIER_MUST_HAVE_THE_SAME_MEMBERS_AS_NON_FINAL_EXPECT_CLASSIFIER_WARNING!>class Foo<!> {
+actual open class Foo {
     actual fun foo() {}
 
-    fun <!NON_ACTUAL_MEMBER_DECLARED_IN_EXPECT_NON_FINAL_CLASSIFIER_ACTUALIZATION_WARNING!>foo<!>(overloaded: Int) {} // accidential override can happen with this injected fun. That's why it's prohibited
+    fun foo(overloaded: Int) {}
 }
diff --git a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/injectParameterOverloadWithGenerics.fir.kt b/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/injectParameterOverloadWithGenerics.fir.kt
deleted file mode 100644
index 552efaa250d..00000000000
--- a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/injectParameterOverloadWithGenerics.fir.kt
+++ /dev/null
@@ -1,15 +0,0 @@
-// MODULE: m1-common
-// FILE: common.kt
-
-open class Base<T> {
-    open fun foo(t: T) {}
-}
-
-expect open class Foo<R> : Base<R>
-
-// MODULE: m2-jvm()()(m1-common)
-// FILE: jvm.kt
-
-actual open class Foo<R>() : Base<R>() {
-    fun <T> foo(t: T) {}
-}
diff --git a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/injectParameterOverloadWithGenerics.kt b/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/injectParameterOverloadWithGenerics.kt
index 2291ca0ac97..f070994a26f 100644
--- a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/injectParameterOverloadWithGenerics.kt
+++ b/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/injectParameterOverloadWithGenerics.kt
@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 // MODULE: m1-common
 // FILE: common.kt
 
@@ -10,6 +11,6 @@ expect open class Foo<R> : Base<R>
 // MODULE: m2-jvm()()(m1-common)
 // FILE: jvm.kt
 
-actual open <!ACTUAL_CLASSIFIER_MUST_HAVE_THE_SAME_MEMBERS_AS_NON_FINAL_EXPECT_CLASSIFIER_WARNING!>class Foo<!><R>() : Base<R>() {
-    fun <T> <!NON_ACTUAL_MEMBER_DECLARED_IN_EXPECT_NON_FINAL_CLASSIFIER_ACTUALIZATION_WARNING!>foo<!>(t: T) {}
+actual open class Foo<R>() : Base<R>() {
+    fun <T> foo(t: T) {}
 }
diff --git a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/injectProperty.fir.kt b/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/injectProperty.fir.kt
deleted file mode 100644
index e433fb14fa6..00000000000
--- a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/injectProperty.fir.kt
+++ /dev/null
@@ -1,17 +0,0 @@
-// MODULE: m1-common
-// FILE: common.kt
-
-expect open class Foo {
-    fun existingFun()
-    val existingParam: Int
-}
-
-// MODULE: m2-jvm()()(m1-common)
-// FILE: jvm.kt
-
-actual open class Foo {
-    actual fun existingFun() {}
-    actual val existingParam: Int = 904
-
-    val injectedProperty = 1
-}
diff --git a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/injectProperty.kt b/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/injectProperty.kt
index 103e13a9413..9edbb50daa8 100644
--- a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/injectProperty.kt
+++ b/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/injectProperty.kt
@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 // MODULE: m1-common
 // FILE: common.kt
 
@@ -9,9 +10,9 @@ expect open class Foo {
 // MODULE: m2-jvm()()(m1-common)
 // FILE: jvm.kt
 
-actual open <!ACTUAL_CLASSIFIER_MUST_HAVE_THE_SAME_MEMBERS_AS_NON_FINAL_EXPECT_CLASSIFIER_WARNING!>class Foo<!> {
+actual open class Foo {
     actual fun existingFun() {}
     actual val existingParam: Int = 904
 
-    val <!NON_ACTUAL_MEMBER_DECLARED_IN_EXPECT_NON_FINAL_CLASSIFIER_ACTUALIZATION_WARNING!>injectedProperty<!> = 1
+    val injectedProperty = 1
 }
diff --git a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/injectPropertyWithTheSameSignatureAsExistingFunction.fir.kt b/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/injectPropertyWithTheSameSignatureAsExistingFunction.fir.kt
deleted file mode 100644
index e7a669192bf..00000000000
--- a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/injectPropertyWithTheSameSignatureAsExistingFunction.fir.kt
+++ /dev/null
@@ -1,15 +0,0 @@
-// MODULE: m1-common
-// FILE: common.kt
-
-expect open class Foo {
-    fun foo(): Int
-}
-
-// MODULE: m2-jvm()()(m1-common)
-// FILE: jvm.kt
-
-actual open class Foo {
-    actual fun foo(): Int = 904
-
-    val foo: Int = 42
-}
diff --git a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/injectPropertyWithTheSameSignatureAsExistingFunction.kt b/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/injectPropertyWithTheSameSignatureAsExistingFunction.kt
index 40027019908..0fdbf34a946 100644
--- a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/injectPropertyWithTheSameSignatureAsExistingFunction.kt
+++ b/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/injectPropertyWithTheSameSignatureAsExistingFunction.kt
@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 // MODULE: m1-common
 // FILE: common.kt
 
@@ -8,8 +9,8 @@ expect open class Foo {
 // MODULE: m2-jvm()()(m1-common)
 // FILE: jvm.kt
 
-actual open <!ACTUAL_CLASSIFIER_MUST_HAVE_THE_SAME_MEMBERS_AS_NON_FINAL_EXPECT_CLASSIFIER_WARNING!>class Foo<!> {
+actual open class Foo {
     actual fun foo(): Int = 904
 
-    val <!NON_ACTUAL_MEMBER_DECLARED_IN_EXPECT_NON_FINAL_CLASSIFIER_ACTUALIZATION_WARNING!>foo<!>: Int = 42
+    val foo: Int = 42
 }
diff --git a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/injectVarargParameterOverload.fir.kt b/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/injectVarargParameterOverload.fir.kt
deleted file mode 100644
index 2616b567569..00000000000
--- a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/injectVarargParameterOverload.fir.kt
+++ /dev/null
@@ -1,15 +0,0 @@
-// MODULE: m1-common
-// FILE: common.kt
-
-open class Base {
-    open fun foo(t: String) {}
-}
-
-expect open class Foo : Base
-
-// MODULE: m2-jvm()()(m1-common)
-// FILE: jvm.kt
-
-actual open class Foo : Base() {
-    open fun foo(vararg t: String) {} // injected
-}
diff --git a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/injectVarargParameterOverload.kt b/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/injectVarargParameterOverload.kt
index 4908989fc37..110af3691da 100644
--- a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/injectVarargParameterOverload.kt
+++ b/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/injectVarargParameterOverload.kt
@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 // MODULE: m1-common
 // FILE: common.kt
 
@@ -10,6 +11,6 @@ expect open class Foo : Base
 // MODULE: m2-jvm()()(m1-common)
 // FILE: jvm.kt
 
-actual open <!ACTUAL_CLASSIFIER_MUST_HAVE_THE_SAME_MEMBERS_AS_NON_FINAL_EXPECT_CLASSIFIER_WARNING!>class Foo<!> : Base() {
-    open fun <!NON_ACTUAL_MEMBER_DECLARED_IN_EXPECT_NON_FINAL_CLASSIFIER_ACTUALIZATION_WARNING!>foo<!>(vararg t: String) {} // injected
+actual open class Foo : Base() {
+    open fun foo(vararg t: String) {} // injected
 }
diff --git a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/kt62027.fir.kt b/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/kt62027.fir.kt
deleted file mode 100644
index e144e7456b4..00000000000
--- a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/kt62027.fir.kt
+++ /dev/null
@@ -1,14 +0,0 @@
-// MODULE: m1-common
-// FILE: common.kt
-
-expect open class Foo {
-    fun <T> foo(t: T)
-}
-
-// MODULE: m2-jvm()()(m1-common)
-// FILE: jvm.kt
-
-actual open class Foo {
-    actual fun <T> foo(t: T) {}
-    fun foo(t: String) {}
-}
diff --git a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/kt62027.kt b/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/kt62027.kt
index b41aba66baa..31b694b28c2 100644
--- a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/kt62027.kt
+++ b/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/kt62027.kt
@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 // MODULE: m1-common
 // FILE: common.kt
 
@@ -8,7 +9,7 @@ expect open class Foo {
 // MODULE: m2-jvm()()(m1-common)
 // FILE: jvm.kt
 
-actual open <!ACTUAL_CLASSIFIER_MUST_HAVE_THE_SAME_MEMBERS_AS_NON_FINAL_EXPECT_CLASSIFIER_WARNING!>class Foo<!> {
+actual open class Foo {
     actual fun <T> foo(t: T) {}
-    fun <!NON_ACTUAL_MEMBER_DECLARED_IN_EXPECT_NON_FINAL_CLASSIFIER_ACTUALIZATION_WARNING!>foo<!>(t: String) {}
+    fun foo(t: String) {}
 }
diff --git a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/nestedExpectOpenClass.fir.kt b/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/nestedExpectOpenClass.fir.kt
deleted file mode 100644
index af1a182bc32..00000000000
--- a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/nestedExpectOpenClass.fir.kt
+++ /dev/null
@@ -1,22 +0,0 @@
-// MODULE: m1-common
-// FILE: common.kt
-
-// Rules for expect actual matching are ad-hoc for nested classes. That's why this test exist
-expect class Outer {
-    open class Foo {
-        fun existingMethod()
-        val existingParam: Int
-    }
-}
-
-// MODULE: m2-jvm()()(m1-common)
-// FILE: jvm.kt
-
-actual class Outer {
-    actual open class Foo {
-        actual fun existingMethod() {}
-        actual val existingParam: Int = 904
-
-        fun injectedMethod() {} // accidential override can happen with this injected fun. That's why it's prohibited
-    }
-}
diff --git a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/nestedExpectOpenClass.kt b/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/nestedExpectOpenClass.kt
index bba1ecc9bab..11b61a30bd3 100644
--- a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/nestedExpectOpenClass.kt
+++ b/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/nestedExpectOpenClass.kt
@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 // MODULE: m1-common
 // FILE: common.kt
 
@@ -13,10 +14,10 @@ expect class Outer {
 // FILE: jvm.kt
 
 actual class Outer {
-    actual open <!ACTUAL_CLASSIFIER_MUST_HAVE_THE_SAME_MEMBERS_AS_NON_FINAL_EXPECT_CLASSIFIER_WARNING!>class Foo<!> {
+    actual open class Foo {
         actual fun existingMethod() {}
         actual val existingParam: Int = 904
 
-        fun <!NON_ACTUAL_MEMBER_DECLARED_IN_EXPECT_NON_FINAL_CLASSIFIER_ACTUALIZATION_WARNING!>injectedMethod<!>() {} // accidential override can happen with this injected fun. That's why it's prohibited
+        fun injectedMethod() {}
     }
 }
diff --git a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/overloadMethodInjectedInSuper.fir.kt b/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/overloadMethodInjectedInSuper.fir.kt
new file mode 100644
index 00000000000..42aa8a0cdfa
--- /dev/null
+++ b/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/overloadMethodInjectedInSuper.fir.kt
@@ -0,0 +1,21 @@
+// MODULE: m1-common
+// FILE: common.kt
+
+expect open class Base
+
+expect open class Foo : Base {
+    fun foo(param: Int)
+}
+
+// MODULE: m2-jvm()()(m1-common)
+// FILE: jvm.kt
+
+actual open class Base {
+    open fun foo(): Any = ""
+}
+
+actual open class Foo : Base() {
+    override fun foo(): String = ""
+
+    actual fun foo(param: Int) {}
+}
diff --git a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/overloadMethodInjectedInSuper.kt b/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/overloadMethodInjectedInSuper.kt
new file mode 100644
index 00000000000..35e848246a1
--- /dev/null
+++ b/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/overloadMethodInjectedInSuper.kt
@@ -0,0 +1,21 @@
+// MODULE: m1-common
+// FILE: common.kt
+
+expect open class Base
+
+expect open class Foo : Base {
+    fun foo(param: Int)
+}
+
+// MODULE: m2-jvm()()(m1-common)
+// FILE: jvm.kt
+
+actual open class Base {
+    open fun foo(): Any = ""
+}
+
+actual open <!ACTUAL_CLASSIFIER_MUST_HAVE_THE_SAME_MEMBERS_AS_NON_FINAL_EXPECT_CLASSIFIER_WARNING!>class Foo<!> : Base() {
+    override fun foo(): <!RETURN_TYPE_CHANGED_IN_NON_FINAL_EXPECT_CLASSIFIER_ACTUALIZATION_WARNING!>String<!> = ""
+
+    actual fun foo(param: Int) {}
+}
diff --git a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/severalMismatches.kt b/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/severalMismatches.kt
index 18faf9fc406..08f57ca90cc 100644
--- a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/severalMismatches.kt
+++ b/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/severalMismatches.kt
@@ -20,8 +20,8 @@ actual open <!ACTUAL_CLASSIFIER_MUST_HAVE_THE_SAME_MEMBERS_AS_NON_FINAL_EXPECT_C
     actual fun existingMethod() {}
     actual val existingParam: Int = 904
 
-    fun <!NON_ACTUAL_MEMBER_DECLARED_IN_EXPECT_NON_FINAL_CLASSIFIER_ACTUALIZATION_WARNING!>injectedMethod<!>() {}
-    val <!NON_ACTUAL_MEMBER_DECLARED_IN_EXPECT_NON_FINAL_CLASSIFIER_ACTUALIZATION_WARNING!>injectedProperty<!>: Int = 42
+    fun injectedMethod() {}
+    val injectedProperty: Int = 42
     override fun overrideReturnType(): <!RETURN_TYPE_CHANGED_IN_NON_FINAL_EXPECT_CLASSIFIER_ACTUALIZATION_WARNING!>String<!> = ""
     <!MODALITY_CHANGED_IN_NON_FINAL_EXPECT_CLASSIFIER_ACTUALIZATION_WARNING!>final<!> override fun overrideModality1(): Any = ""
     <!MODALITY_CHANGED_IN_NON_FINAL_EXPECT_CLASSIFIER_ACTUALIZATION_WARNING!>final<!> override fun overrideModality2(): Any = ""
diff --git a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/supertypeIsExpectActual_covariantOverrideOfInjectedFromSuper.kt b/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/supertypeIsExpectActual_covariantOverrideOfInjectedFromSuper.kt
index c7df534494d..9f03e2a1bed 100644
--- a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/supertypeIsExpectActual_covariantOverrideOfInjectedFromSuper.kt
+++ b/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/supertypeIsExpectActual_covariantOverrideOfInjectedFromSuper.kt
@@ -14,9 +14,9 @@ expect open class Foo : Base {
 // MODULE: m2-jvm()()(m1-common)
 // FILE: jvm.kt
 
-actual open <!ACTUAL_CLASSIFIER_MUST_HAVE_THE_SAME_MEMBERS_AS_NON_FINAL_EXPECT_CLASSIFIER_WARNING!>class Base<!> {
+actual open class Base {
     actual fun existingMethodInBase() {}
-    open fun <!NON_ACTUAL_MEMBER_DECLARED_IN_EXPECT_NON_FINAL_CLASSIFIER_ACTUALIZATION_WARNING!>injected<!>(): Any = ""
+    open fun injected(): Any = ""
 }
 
 actual open <!ACTUAL_CLASSIFIER_MUST_HAVE_THE_SAME_MEMBERS_AS_NON_FINAL_EXPECT_CLASSIFIER_WARNING!>class Foo<!> : Base() {
diff --git a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/supertypeIsExpectActual_covariantOverrideOfInjectedFromSuper_transitiveSubstitutionFakeOverride.kt b/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/supertypeIsExpectActual_covariantOverrideOfInjectedFromSuper_transitiveSubstitutionFakeOverride.kt
index 304e9825bc5..46ab2ed31b6 100644
--- a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/supertypeIsExpectActual_covariantOverrideOfInjectedFromSuper_transitiveSubstitutionFakeOverride.kt
+++ b/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/supertypeIsExpectActual_covariantOverrideOfInjectedFromSuper_transitiveSubstitutionFakeOverride.kt
@@ -16,9 +16,9 @@ expect open class Foo : Transitive {
 // MODULE: m2-jvm()()(m1-common)
 // FILE: jvm.kt
 
-actual open <!ACTUAL_CLASSIFIER_MUST_HAVE_THE_SAME_MEMBERS_AS_NON_FINAL_EXPECT_CLASSIFIER_WARNING!>class Base<!><T> {
+actual open class Base<T> {
     actual fun existingMethodInBase(param: T) {}
-    open fun <!NON_ACTUAL_MEMBER_DECLARED_IN_EXPECT_NON_FINAL_CLASSIFIER_ACTUALIZATION_WARNING!>injected<!>(param: T): Any = ""
+    open fun injected(param: T): Any = ""
 }
 
 actual open <!ACTUAL_CLASSIFIER_MUST_HAVE_THE_SAME_MEMBERS_AS_NON_FINAL_EXPECT_CLASSIFIER_WARNING!>class Foo<!> : Transitive() {
diff --git a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/supertypeIsExpectActual_injectMethod.fir.kt b/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/supertypeIsExpectActual_injectMethod.fir.kt
deleted file mode 100644
index 7b466913082..00000000000
--- a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/supertypeIsExpectActual_injectMethod.fir.kt
+++ /dev/null
@@ -1,25 +0,0 @@
-// WITH_STDLIB
-// MODULE: m1-common
-// FILE: common.kt
-
-expect open class Base {
-    fun existingMethodInBase()
-}
-
-expect open class Foo : Base {
-    fun existingMethod()
-    val existingParam: Int
-}
-
-// MODULE: m2-jvm()()(m1-common)
-// FILE: jvm.kt
-
-actual open class Base {
-    actual fun existingMethodInBase() {}
-    fun injected() {}
-}
-
-actual open class Foo : Base() {
-    actual fun existingMethod() {}
-    actual val existingParam: Int = 904
-}
diff --git a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/supertypeIsExpectActual_injectMethod.kt b/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/supertypeIsExpectActual_injectMethod.kt
index 730fc899869..b09eac0dc62 100644
--- a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/supertypeIsExpectActual_injectMethod.kt
+++ b/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/supertypeIsExpectActual_injectMethod.kt
@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 // WITH_STDLIB
 // MODULE: m1-common
 // FILE: common.kt
@@ -14,9 +15,9 @@ expect open class Foo : Base {
 // MODULE: m2-jvm()()(m1-common)
 // FILE: jvm.kt
 
-actual open <!ACTUAL_CLASSIFIER_MUST_HAVE_THE_SAME_MEMBERS_AS_NON_FINAL_EXPECT_CLASSIFIER_WARNING!>class Base<!> {
+actual open class Base {
     actual fun existingMethodInBase() {}
-    fun <!NON_ACTUAL_MEMBER_DECLARED_IN_EXPECT_NON_FINAL_CLASSIFIER_ACTUALIZATION_WARNING!>injected<!>() {}
+    fun injected() {}
 }
 
 actual open class Foo : Base() {
diff --git a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/supertypeIsExpectActual_injectMethod_transitiveSubstitutionFakeOverride.fir.kt b/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/supertypeIsExpectActual_injectMethod_transitiveSubstitutionFakeOverride.fir.kt
deleted file mode 100644
index 701343403ca..00000000000
--- a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/supertypeIsExpectActual_injectMethod_transitiveSubstitutionFakeOverride.fir.kt
+++ /dev/null
@@ -1,27 +0,0 @@
-// WITH_STDLIB
-// MODULE: m1-common
-// FILE: common.kt
-
-expect open class Base<T>() {
-    fun existingMethodInBase(param: T)
-}
-
-open class Transitive : Base<String>()
-
-expect open class Foo : Transitive {
-    fun existingMethod()
-    val existingParam: Int
-}
-
-// MODULE: m2-jvm()()(m1-common)
-// FILE: jvm.kt
-
-actual open class Base<T> {
-    actual fun existingMethodInBase(param: T) {}
-    fun injected() {}
-}
-
-actual open class Foo : Transitive() {
-    actual fun existingMethod() {}
-    actual val existingParam: Int = 904
-}
diff --git a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/supertypeIsExpectActual_injectMethod_transitiveSubstitutionFakeOverride.kt b/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/supertypeIsExpectActual_injectMethod_transitiveSubstitutionFakeOverride.kt
index 635f3a13d5b..4fbc933d5b2 100644
--- a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/supertypeIsExpectActual_injectMethod_transitiveSubstitutionFakeOverride.kt
+++ b/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/supertypeIsExpectActual_injectMethod_transitiveSubstitutionFakeOverride.kt
@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 // WITH_STDLIB
 // MODULE: m1-common
 // FILE: common.kt
@@ -16,9 +17,9 @@ expect open class Foo : Transitive {
 // MODULE: m2-jvm()()(m1-common)
 // FILE: jvm.kt
 
-actual open <!ACTUAL_CLASSIFIER_MUST_HAVE_THE_SAME_MEMBERS_AS_NON_FINAL_EXPECT_CLASSIFIER_WARNING!>class Base<!><T> {
+actual open class Base<T> {
     actual fun existingMethodInBase(param: T) {}
-    fun <!NON_ACTUAL_MEMBER_DECLARED_IN_EXPECT_NON_FINAL_CLASSIFIER_ACTUALIZATION_WARNING!>injected<!>() {}
+    fun injected() {}
 }
 
 actual open class Foo : Transitive() {
diff --git a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/supertypeIsExpectActual_supertypeIsActualTypealias_injectMethod.fir.kt b/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/supertypeIsExpectActual_supertypeIsActualTypealias_injectMethod.fir.kt
deleted file mode 100644
index ff70207f546..00000000000
--- a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/supertypeIsExpectActual_supertypeIsActualTypealias_injectMethod.fir.kt
+++ /dev/null
@@ -1,27 +0,0 @@
-// WITH_STDLIB
-// MODULE: m1-common
-// FILE: common.kt
-
-expect open class Base() {
-    fun existingMethodInBase()
-}
-
-expect open class Foo : Base {
-    fun existingMethod()
-    val existingParam: Int
-}
-
-// MODULE: m2-jvm()()(m1-common)
-// FILE: jvm.kt
-
-actual typealias Base = BaseImpl
-
-open class BaseImpl {
-    fun existingMethodInBase() {}
-    fun injected() {}
-}
-
-actual open class Foo : Base() {
-    actual fun existingMethod() {}
-    actual val existingParam: Int = 904
-}
diff --git a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/supertypeIsExpectActual_supertypeIsActualTypealias_injectMethod.kt b/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/supertypeIsExpectActual_supertypeIsActualTypealias_injectMethod.kt
index dbcbdf43bed..3bd6f448631 100644
--- a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/supertypeIsExpectActual_supertypeIsActualTypealias_injectMethod.kt
+++ b/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/supertypeIsExpectActual_supertypeIsActualTypealias_injectMethod.kt
@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 // WITH_STDLIB
 // MODULE: m1-common
 // FILE: common.kt
@@ -14,7 +15,7 @@ expect open class Foo : Base {
 // MODULE: m2-jvm()()(m1-common)
 // FILE: jvm.kt
 
-actual typealias <!ACTUAL_CLASSIFIER_MUST_HAVE_THE_SAME_MEMBERS_AS_NON_FINAL_EXPECT_CLASSIFIER_WARNING!>Base<!> = BaseImpl
+actual typealias Base = BaseImpl
 
 open class BaseImpl {
     fun existingMethodInBase() {}
diff --git a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/supertypeIsExpectActual_supertypeIsActualTypealias_injectMethod_transitiveSubstitutionFakeOverride.fir.kt b/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/supertypeIsExpectActual_supertypeIsActualTypealias_injectMethod_transitiveSubstitutionFakeOverride.fir.kt
deleted file mode 100644
index c11b3f25caa..00000000000
--- a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/supertypeIsExpectActual_supertypeIsActualTypealias_injectMethod_transitiveSubstitutionFakeOverride.fir.kt
+++ /dev/null
@@ -1,29 +0,0 @@
-// WITH_STDLIB
-// MODULE: m1-common
-// FILE: common.kt
-
-expect open class Base<T>() {
-    fun existingMethodInBase(param: T)
-}
-
-open class Transitive : Base<String>()
-
-expect open class Foo : Transitive {
-    fun existingMethod()
-    val existingParam: Int
-}
-
-// MODULE: m2-jvm()()(m1-common)
-// FILE: jvm.kt
-
-actual typealias Base<T> = BaseImpl<T>
-
-open class BaseImpl<T> {
-    fun existingMethodInBase(param: T) {}
-    fun injected() {}
-}
-
-actual open class Foo : Transitive() {
-    actual fun existingMethod() {}
-    actual val existingParam: Int = 904
-}
diff --git a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/supertypeIsExpectActual_supertypeIsActualTypealias_injectMethod_transitiveSubstitutionFakeOverride.kt b/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/supertypeIsExpectActual_supertypeIsActualTypealias_injectMethod_transitiveSubstitutionFakeOverride.kt
index ca4db3ac761..ad67ce89ec6 100644
--- a/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/supertypeIsExpectActual_supertypeIsActualTypealias_injectMethod_transitiveSubstitutionFakeOverride.kt
+++ b/compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/supertypeIsExpectActual_supertypeIsActualTypealias_injectMethod_transitiveSubstitutionFakeOverride.kt
@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 // WITH_STDLIB
 // MODULE: m1-common
 // FILE: common.kt
@@ -16,7 +17,7 @@ expect open class Foo : Transitive {
 // MODULE: m2-jvm()()(m1-common)
 // FILE: jvm.kt
 
-actual typealias <!ACTUAL_CLASSIFIER_MUST_HAVE_THE_SAME_MEMBERS_AS_NON_FINAL_EXPECT_CLASSIFIER_WARNING!>Base<!><T> = BaseImpl<T>
+actual typealias Base<T> = BaseImpl<T>
 
 open class BaseImpl<T> {
     fun existingMethodInBase(param: T) {}
diff --git a/compiler/testData/diagnostics/tests/multiplatform/headerClass/genericClassImplTypeAlias.kt b/compiler/testData/diagnostics/tests/multiplatform/headerClass/genericClassImplTypeAlias.kt
index 03130c8e8a3..804c086a1ae 100644
--- a/compiler/testData/diagnostics/tests/multiplatform/headerClass/genericClassImplTypeAlias.kt
+++ b/compiler/testData/diagnostics/tests/multiplatform/headerClass/genericClassImplTypeAlias.kt
@@ -22,16 +22,16 @@ class B<T>
 actual typealias C1 = String
 <!ACTUAL_TYPE_ALIAS_TO_CLASS_WITH_DECLARATION_SITE_VARIANCE!>actual typealias C2<A> = List<String><!>
 <!ACTUAL_TYPE_ALIAS_TO_CLASS_WITH_DECLARATION_SITE_VARIANCE!>actual typealias C3<B> = List<B><!>
-actual typealias <!ACTUAL_CLASSIFIER_MUST_HAVE_THE_SAME_MEMBERS_AS_NON_FINAL_EXPECT_CLASSIFIER_WARNING!>C4<!><D, E> = MutableMap<D, E>
-<!ACTUAL_TYPE_ALIAS_WITH_COMPLEX_SUBSTITUTION!>actual typealias <!ACTUAL_CLASSIFIER_MUST_HAVE_THE_SAME_MEMBERS_AS_NON_FINAL_EXPECT_CLASSIFIER_WARNING!>C5<!><F, G> = MutableMap<G, F><!>
+actual typealias C4<D, E> = MutableMap<D, E>
+<!ACTUAL_TYPE_ALIAS_WITH_COMPLEX_SUBSTITUTION!>actual typealias C5<F, G> = MutableMap<G, F><!>
 <!ACTUAL_TYPE_ALIAS_WITH_COMPLEX_SUBSTITUTION!>actual typealias C51 = MutableMap<String, String><!>
 <!ACTUAL_TYPE_ALIAS_WITH_COMPLEX_SUBSTITUTION!>actual typealias C52<F> = MutableMap<F, String><!>
 <!ACTUAL_TYPE_ALIAS_WITH_COMPLEX_SUBSTITUTION!>actual typealias C53<T> = A<A<T>><!>
 <!ACTUAL_TYPE_ALIAS_WITH_COMPLEX_SUBSTITUTION!>actual typealias C54<T> = B<List<String>><!>
-actual typealias <!ACTUAL_CLASSIFIER_MUST_HAVE_THE_SAME_MEMBERS_AS_NON_FINAL_EXPECT_CLASSIFIER_WARNING!>C6<!><H> = MutableList<H>
-<!ACTUAL_TYPE_ALIAS_WITH_USE_SITE_VARIANCE!>actual typealias <!ACTUAL_CLASSIFIER_MUST_HAVE_THE_SAME_MEMBERS_AS_NON_FINAL_EXPECT_CLASSIFIER_WARNING!>C7<!><I> = MutableList<out I><!>
-<!ACTUAL_TYPE_ALIAS_WITH_USE_SITE_VARIANCE!>actual typealias <!ACTUAL_CLASSIFIER_MUST_HAVE_THE_SAME_MEMBERS_AS_NON_FINAL_EXPECT_CLASSIFIER_WARNING!>C8<!><J> = MutableList<*><!>
-<!ACTUAL_TYPE_ALIAS_WITH_USE_SITE_VARIANCE!>actual typealias <!ACTUAL_CLASSIFIER_MUST_HAVE_THE_SAME_MEMBERS_AS_NON_FINAL_EXPECT_CLASSIFIER_WARNING!>C9<!><K> = MutableList<in K><!>
+actual typealias C6<H> = MutableList<H>
+<!ACTUAL_TYPE_ALIAS_WITH_USE_SITE_VARIANCE!>actual typealias C7<I> = MutableList<out I><!>
+<!ACTUAL_TYPE_ALIAS_WITH_USE_SITE_VARIANCE!>actual typealias C8<J> = MutableList<*><!>
+<!ACTUAL_TYPE_ALIAS_WITH_USE_SITE_VARIANCE!>actual typealias C9<K> = MutableList<in K><!>
 
 typealias Tmp<K> = MutableList<K>
-<!ACTUAL_TYPE_ALIAS_NOT_TO_CLASS!>actual typealias <!ACTUAL_CLASSIFIER_MUST_HAVE_THE_SAME_MEMBERS_AS_NON_FINAL_EXPECT_CLASSIFIER_WARNING!>C10<!><L> = Tmp<L><!>
+<!ACTUAL_TYPE_ALIAS_NOT_TO_CLASS!>actual typealias C10<L> = Tmp<L><!>
diff --git a/compiler/testData/diagnostics/tests/multiplatform/hmpp/kt57320.kt b/compiler/testData/diagnostics/tests/multiplatform/hmpp/kt57320.kt
index 1e9540c2596..067ecb08938 100644
--- a/compiler/testData/diagnostics/tests/multiplatform/hmpp/kt57320.kt
+++ b/compiler/testData/diagnostics/tests/multiplatform/hmpp/kt57320.kt
@@ -32,7 +32,7 @@ expect fun StringDemoInterface.plusK(): <!NO_ACTUAL_FOR_EXPECT{JS}!>String<!>
 // TARGET_PLATFORM: JS
 
 // FILE: StringDemoInterface.kt
-actual typealias <!ACTUAL_CLASSIFIER_MUST_HAVE_THE_SAME_MEMBERS_AS_NON_FINAL_EXPECT_CLASSIFIER_WARNING!>StringDemoInterface<!> = KotlinXStringDemoInterface
+actual typealias StringDemoInterface = KotlinXStringDemoInterface
 
 actual fun StringDemoInterface.<!ACTUAL_WITHOUT_EXPECT("Actual function 'plusK'; The following declaration is incompatible because return type is different:    public expect fun StringDemoInterface /* = KotlinXStringDemoInterface */.plusK(): String")!>plusK<!>() = <!RESOLUTION_TO_CLASSIFIER!>StringValue<!>(value).<!DEBUG_INFO_MISSING_UNRESOLVED!>plus<!>("K").<!DEBUG_INFO_MISSING_UNRESOLVED!>value<!>
 
diff --git a/compiler/testData/diagnostics/tests/multiplatform/hmpp/simple.fir.kt b/compiler/testData/diagnostics/tests/multiplatform/hmpp/simple.fir.kt
deleted file mode 100644
index 152a3326d1a..00000000000
--- a/compiler/testData/diagnostics/tests/multiplatform/hmpp/simple.fir.kt
+++ /dev/null
@@ -1,22 +0,0 @@
-
-// MODULE: common
-// TARGET_PLATFORM: Common
-expect open class A()
-
-// MODULE: intermediate()()(common)
-// TARGET_PLATFORM: Common
-class B : A() {
-    fun foo(): String = "O"
-}
-
-fun getB(): B = B()
-
-// MODULE: main()()(intermediate)
-actual open class A actual constructor() {
-    fun bar(): String = "K"
-}
-
-fun box(): String {
-    val b = getB()
-    return b.foo() + b.bar()
-}
diff --git a/compiler/testData/diagnostics/tests/multiplatform/hmpp/simple.kt b/compiler/testData/diagnostics/tests/multiplatform/hmpp/simple.kt
index 392d13a2870..fd79eff6cdc 100644
--- a/compiler/testData/diagnostics/tests/multiplatform/hmpp/simple.kt
+++ b/compiler/testData/diagnostics/tests/multiplatform/hmpp/simple.kt
@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 
 // MODULE: common
 // TARGET_PLATFORM: Common
@@ -12,8 +13,8 @@ class B : A() {
 fun getB(): B = B()
 
 // MODULE: main()()(intermediate)
-actual open <!ACTUAL_CLASSIFIER_MUST_HAVE_THE_SAME_MEMBERS_AS_NON_FINAL_EXPECT_CLASSIFIER_WARNING!>class A<!> actual constructor() {
-    fun <!NON_ACTUAL_MEMBER_DECLARED_IN_EXPECT_NON_FINAL_CLASSIFIER_ACTUALIZATION_WARNING!>bar<!>(): String = "K"
+actual open class A actual constructor() {
+    fun bar(): String = "K"
 }
 
 fun box(): String {
diff --git a/compiler/testData/diagnostics/tests/multiplatform/manyImplMemberNotImplemented.kt b/compiler/testData/diagnostics/tests/multiplatform/manyImplMemberNotImplemented.kt
index c6af35c77fb..93f11e84637 100644
--- a/compiler/testData/diagnostics/tests/multiplatform/manyImplMemberNotImplemented.kt
+++ b/compiler/testData/diagnostics/tests/multiplatform/manyImplMemberNotImplemented.kt
@@ -21,18 +21,18 @@ class C : C2(), I2
 // TARGET_PLATFORM: JVM
 // FILE: main.kt
 
-actual open <!ACTUAL_CLASSIFIER_MUST_HAVE_THE_SAME_MEMBERS_AS_NON_FINAL_EXPECT_CLASSIFIER_WARNING!>class C1<!> {
-    fun <!NON_ACTUAL_MEMBER_DECLARED_IN_EXPECT_NON_FINAL_CLASSIFIER_ACTUALIZATION_WARNING!>f<!>() {}
+actual open class C1 {
+    fun f() {}
 }
 
-<!ACTUAL_CLASSIFIER_MUST_HAVE_THE_SAME_MEMBERS_AS_NON_FINAL_EXPECT_CLASSIFIER_WARNING!>actual interface I1<!> {
-    fun <!NON_ACTUAL_MEMBER_DECLARED_IN_EXPECT_NON_FINAL_CLASSIFIER_ACTUALIZATION_WARNING!>f<!>() {}
+actual interface I1 {
+    fun f() {}
 }
 
-actual abstract <!ACTUAL_CLASSIFIER_MUST_HAVE_THE_SAME_MEMBERS_AS_NON_FINAL_EXPECT_CLASSIFIER_WARNING!>class C2<!> actual constructor() {
-    fun <!NON_ACTUAL_MEMBER_DECLARED_IN_EXPECT_NON_FINAL_CLASSIFIER_ACTUALIZATION_WARNING!>g<!>() {}
+actual abstract class C2 actual constructor() {
+    fun g() {}
 }
 
-<!ACTUAL_CLASSIFIER_MUST_HAVE_THE_SAME_MEMBERS_AS_NON_FINAL_EXPECT_CLASSIFIER_WARNING!>actual interface I2<!> {
-    fun <!NON_ACTUAL_MEMBER_DECLARED_IN_EXPECT_NON_FINAL_CLASSIFIER_ACTUALIZATION_WARNING!>g<!>()
+actual interface I2 {
+    fun g()
 }
diff --git a/compiler/testData/diagnostics/tests/multiplatform/manyInterfacesMemberNotImplemented.kt b/compiler/testData/diagnostics/tests/multiplatform/manyInterfacesMemberNotImplemented.kt
index 26c1840ff11..db8b3d83aad 100644
--- a/compiler/testData/diagnostics/tests/multiplatform/manyInterfacesMemberNotImplemented.kt
+++ b/compiler/testData/diagnostics/tests/multiplatform/manyInterfacesMemberNotImplemented.kt
@@ -16,10 +16,10 @@ class B : A()
 // TARGET_PLATFORM: JVM
 // FILE: main.kt
 
-<!ACTUAL_CLASSIFIER_MUST_HAVE_THE_SAME_MEMBERS_AS_NON_FINAL_EXPECT_CLASSIFIER_WARNING!>actual interface S1<!> {
-    fun <!NON_ACTUAL_MEMBER_DECLARED_IN_EXPECT_NON_FINAL_CLASSIFIER_ACTUALIZATION_WARNING!>f<!>() {}
+actual interface S1 {
+    fun f() {}
 }
 
-<!ACTUAL_CLASSIFIER_MUST_HAVE_THE_SAME_MEMBERS_AS_NON_FINAL_EXPECT_CLASSIFIER_WARNING!>actual interface S2<!> {
-    fun <!NON_ACTUAL_MEMBER_DECLARED_IN_EXPECT_NON_FINAL_CLASSIFIER_ACTUALIZATION_WARNING!>f<!>() {}
+actual interface S2 {
+    fun f() {}
 }
diff --git a/compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/DiagnosticTestGenerated.java b/compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/DiagnosticTestGenerated.java
index 92e223f8795..b2be7815403 100644
--- a/compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/DiagnosticTestGenerated.java
+++ b/compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/DiagnosticTestGenerated.java
@@ -23899,6 +23899,12 @@ public class DiagnosticTestGenerated extends AbstractDiagnosticTest {
                     runTest("compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/nestedExpectOpenClass.kt");
                 }
 
+                @Test
+                @TestMetadata("overloadMethodInjectedInSuper.kt")
+                public void testOverloadMethodInjectedInSuper() throws Exception {
+                    runTest("compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/overloadMethodInjectedInSuper.kt");
+                }
+
                 @Test
                 @TestMetadata("propertyKindOverride.kt")
                 public void testPropertyKindOverride() throws Exception {
diff --git a/core/compiler.common/src/org/jetbrains/kotlin/resolve/multiplatform/ExpectActualMemberDiff.kt b/core/compiler.common/src/org/jetbrains/kotlin/resolve/multiplatform/ExpectActualMemberDiff.kt
index 56dd25614ed..1a02c185a0a 100644
--- a/core/compiler.common/src/org/jetbrains/kotlin/resolve/multiplatform/ExpectActualMemberDiff.kt
+++ b/core/compiler.common/src/org/jetbrains/kotlin/resolve/multiplatform/ExpectActualMemberDiff.kt
@@ -13,10 +13,6 @@ data class ExpectActualMemberDiff<out M, out C>(val kind: Kind, val actualMember
      * Also see: [toMemberDiffKind]
      */
     enum class Kind(val rawMessage: String) {
-        NonPrivateCallableAdded(
-            "{0}: non-private member must be declared in both the actual class and the expect class. " +
-                    "This error happens because the expect class ''{1}'' is non-final"
-        ),
         ReturnTypeChangedInOverride(
             "{0}: the return type of this member must be the same in the expect class and the actual class. " +
                     "This error happens because the expect class ''{1}'' is non-final"
@@ -61,14 +57,17 @@ data class ExpectActualMemberDiff<out M, out C>(val kind: Kind, val actualMember
 }
 
 fun ExpectActualCompatibility.Incompatible<*>.toMemberDiffKind(): ExpectActualMemberDiff.Kind? = when (this) {
-    ExpectActualCompatibility.Incompatible.CallableKind -> ExpectActualMemberDiff.Kind.NonPrivateCallableAdded
-    ExpectActualCompatibility.Incompatible.ParameterCount -> ExpectActualMemberDiff.Kind.NonPrivateCallableAdded
-    ExpectActualCompatibility.Incompatible.ParameterShape -> ExpectActualMemberDiff.Kind.NonPrivateCallableAdded
-    ExpectActualCompatibility.Incompatible.ParameterTypes -> ExpectActualMemberDiff.Kind.NonPrivateCallableAdded
+    ExpectActualCompatibility.Incompatible.CallableKind,
+    ExpectActualCompatibility.Incompatible.ParameterCount,
+    ExpectActualCompatibility.Incompatible.ParameterShape,
+    ExpectActualCompatibility.Incompatible.ParameterTypes,
+    ExpectActualCompatibility.Incompatible.FunctionTypeParameterCount,
+    ExpectActualCompatibility.Incompatible.FunctionTypeParameterUpperBounds,
+        // It's an awful API. It will be fixed in KT-62752
+    -> error("It's not allowed to call this function with receiver: $this")
+
     ExpectActualCompatibility.Incompatible.ReturnType -> ExpectActualMemberDiff.Kind.ReturnTypeChangedInOverride
-    ExpectActualCompatibility.Incompatible.FunctionTypeParameterCount -> ExpectActualMemberDiff.Kind.NonPrivateCallableAdded
     ExpectActualCompatibility.Incompatible.ClassTypeParameterCount -> error("Not applicable because ExpectActualMemberDiff is about members")
-    ExpectActualCompatibility.Incompatible.FunctionTypeParameterUpperBounds -> ExpectActualMemberDiff.Kind.NonPrivateCallableAdded
     ExpectActualCompatibility.Incompatible.ClassTypeParameterUpperBounds -> error("Not applicable because ExpectActualMemberDiff is about members")
     ExpectActualCompatibility.Incompatible.ActualFunctionWithDefaultParameters -> null // It's not possible to add default parameters in override
     ExpectActualCompatibility.Incompatible.ClassKind -> error("Not applicable because ExpectActualMemberDiff is about members")