diff --git a/compiler/testData/codegen/box/assert/alwaysEnable.kt b/compiler/testData/codegen/box/assert/alwaysEnable.kt
index 1f8152dec33..bbb81fbab3c 100644
--- a/compiler/testData/codegen/box/assert/alwaysEnable.kt
+++ b/compiler/testData/codegen/box/assert/alwaysEnable.kt
@@ -5,6 +5,8 @@
 // ASSERTIONS_MODE: always-enable
 // WITH_STDLIB
 
+@file:Suppress("OPT_IN_USAGE_ERROR") // ExperimentalNativeApi is defined only in Native
+
 fun checkTrue(): Boolean {
     var hit = false
     val l = { hit = true; true }
diff --git a/compiler/testData/codegen/box/regressions/kt2246.kt b/compiler/testData/codegen/box/regressions/kt2246.kt
index 73aafe18274..88b5932bc6f 100644
--- a/compiler/testData/codegen/box/regressions/kt2246.kt
+++ b/compiler/testData/codegen/box/regressions/kt2246.kt
@@ -6,6 +6,7 @@
 
 // WITH_STDLIB
 
+@Suppress("OPT_IN_USAGE_ERROR") // ExperimentalNativeApi is defined only in Native
 fun box(): String {
   kotlin.assert(true)
   return "OK"
diff --git a/compiler/testData/codegen/box/volatile/messagePassing.kt b/compiler/testData/codegen/box/volatile/messagePassing.kt
index 8a8810edc83..afce95f5e7b 100644
--- a/compiler/testData/codegen/box/volatile/messagePassing.kt
+++ b/compiler/testData/codegen/box/volatile/messagePassing.kt
@@ -10,6 +10,7 @@ import kotlin.concurrent.*
 var y = -1
 
 fun box() : String {
+    @OptIn(kotlin.experimental.ExperimentalNativeApi::class)
     if (Platform.memoryModel != MemoryModel.EXPERIMENTAL) {
         // The test doesn't make sense for legacy mm, you can't have anything non-atomic to protect with @Volatile var
         return "OK"
diff --git a/kotlin-native/backend.native/tests/codegen/enum/isFrozen.kt b/kotlin-native/backend.native/tests/codegen/enum/isFrozen.kt
index 470401ff5a9..b79747d68aa 100644
--- a/kotlin-native/backend.native/tests/codegen/enum/isFrozen.kt
+++ b/kotlin-native/backend.native/tests/codegen/enum/isFrozen.kt
@@ -2,7 +2,7 @@
  * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
  * that can be found in the LICENSE file.
  */
-@file:OptIn(FreezingIsDeprecated::class)
+@file:OptIn(FreezingIsDeprecated::class, kotlin.experimental.ExperimentalNativeApi::class)
 package codegen.enum.isFrozen
 
 import kotlin.test.*
diff --git a/kotlin-native/backend.native/tests/codegen/initializers/static.kt b/kotlin-native/backend.native/tests/codegen/initializers/static.kt
index 75cc82e8a4f..0576c4187f5 100644
--- a/kotlin-native/backend.native/tests/codegen/initializers/static.kt
+++ b/kotlin-native/backend.native/tests/codegen/initializers/static.kt
@@ -2,7 +2,7 @@
  * Copyright 2010-2021 JetBrains s.r.o. and Kotlin Programming Language contributors.
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
-@file:OptIn(kotlin.ExperimentalStdlibApi::class)
+@file:OptIn(kotlin.ExperimentalStdlibApi::class, kotlin.experimental.ExperimentalNativeApi::class)
 
 package codegen.initializers.static
 
diff --git a/kotlin-native/backend.native/tests/codegen/intrinsics/isExperimentalMM.kt b/kotlin-native/backend.native/tests/codegen/intrinsics/isExperimentalMM.kt
index ae93fb6d8f8..3bb94999d99 100644
--- a/kotlin-native/backend.native/tests/codegen/intrinsics/isExperimentalMM.kt
+++ b/kotlin-native/backend.native/tests/codegen/intrinsics/isExperimentalMM.kt
@@ -2,6 +2,7 @@
  * Copyright 2010-2021 JetBrains s.r.o. and Kotlin Programming Language contributors.
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class)
 
 import kotlin.test.*
 import kotlin.native.Platform
diff --git a/kotlin-native/backend.native/tests/codegen/kclass/kclass1.kt b/kotlin-native/backend.native/tests/codegen/kclass/kclass1.kt
index d98726cb0f2..2af152c829c 100644
--- a/kotlin-native/backend.native/tests/codegen/kclass/kclass1.kt
+++ b/kotlin-native/backend.native/tests/codegen/kclass/kclass1.kt
@@ -34,6 +34,7 @@ fun <T: Any> dsl(block: DslMain.() -> T): T = DslMain().block()
 
 class TestClass
 
+@OptIn(kotlin.experimental.ExperimentalNativeApi::class)
 class App(testQualified: Boolean) {
 
     var type = dsl {
diff --git a/kotlin-native/backend.native/tests/codegen/objectDeclaration/isFrozen.kt b/kotlin-native/backend.native/tests/codegen/objectDeclaration/isFrozen.kt
index 2adbdf9affd..ade756bed92 100644
--- a/kotlin-native/backend.native/tests/codegen/objectDeclaration/isFrozen.kt
+++ b/kotlin-native/backend.native/tests/codegen/objectDeclaration/isFrozen.kt
@@ -3,7 +3,7 @@
  * that can be found in the LICENSE file.
  */
 
-@file:OptIn(FreezingIsDeprecated::class)
+@file:OptIn(FreezingIsDeprecated::class, kotlin.experimental.ExperimentalNativeApi::class)
 package codegen.objectDeclaration.isFrozen
 
 import kotlin.test.*
diff --git a/kotlin-native/backend.native/tests/datagen/rtti/vtable_any.kt b/kotlin-native/backend.native/tests/datagen/rtti/vtable_any.kt
index 7a464adb20e..4ca068f269b 100644
--- a/kotlin-native/backend.native/tests/datagen/rtti/vtable_any.kt
+++ b/kotlin-native/backend.native/tests/datagen/rtti/vtable_any.kt
@@ -2,6 +2,7 @@
  * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
  * that can be found in the LICENSE file.
  */
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class)
 
 package datagen.rtti.vtable_any
 
diff --git a/kotlin-native/backend.native/tests/framework/kt42397/knlibrary.kt b/kotlin-native/backend.native/tests/framework/kt42397/knlibrary.kt
index 06efdf7daca..f3c140b0c7f 100644
--- a/kotlin-native/backend.native/tests/framework/kt42397/knlibrary.kt
+++ b/kotlin-native/backend.native/tests/framework/kt42397/knlibrary.kt
@@ -1,3 +1,5 @@
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class)
+
 import kotlin.native.Platform
 
 // The following 2 singletons are unused. However, since we are generating ObjC bindings for them,
diff --git a/kotlin-native/backend.native/tests/framework/stacktrace/stacktrace.kt b/kotlin-native/backend.native/tests/framework/stacktrace/stacktrace.kt
index d7efee581da..0ef16a3c666 100644
--- a/kotlin-native/backend.native/tests/framework/stacktrace/stacktrace.kt
+++ b/kotlin-native/backend.native/tests/framework/stacktrace/stacktrace.kt
@@ -2,6 +2,7 @@
  * Copyright 2010-2021 JetBrains s.r.o. and Kotlin Programming Language contributors.
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class)
 
 fun inner1() : Nothing {
     throw Exception()
diff --git a/kotlin-native/backend.native/tests/framework/stacktrace/stacktrace.swift b/kotlin-native/backend.native/tests/framework/stacktrace/stacktrace.swift
index a1355a358aa..efab9adc35f 100644
--- a/kotlin-native/backend.native/tests/framework/stacktrace/stacktrace.swift
+++ b/kotlin-native/backend.native/tests/framework/stacktrace/stacktrace.swift
@@ -5,8 +5,8 @@ func testStackTrace() throws {
     let trace = StacktraceKt.getStackTrace()
     try assertTrue(trace[0].contains("Throwable.kt"))
     try assertTrue(trace[1].contains("Exceptions.kt"))
-    try assertTrue(trace[2].contains("stacktrace.kt:7"))
-    try assertTrue(trace[3].contains("stacktrace.kt:12"))
+    try assertTrue(trace[2].contains("stacktrace.kt:8"))
+    try assertTrue(trace[3].contains("stacktrace.kt:13"))
     try assertTrue(trace[4].contains("<compiler-generated>"))
     try assertTrue(trace[5].contains("stacktrace.swift:5"))
     try assertTrue(trace[6].contains("main.swift"))
diff --git a/kotlin-native/backend.native/tests/framework/stacktraceBridges/stacktraceBridges.kt b/kotlin-native/backend.native/tests/framework/stacktraceBridges/stacktraceBridges.kt
index 0aecd9a04ea..38df3833177 100644
--- a/kotlin-native/backend.native/tests/framework/stacktraceBridges/stacktraceBridges.kt
+++ b/kotlin-native/backend.native/tests/framework/stacktraceBridges/stacktraceBridges.kt
@@ -2,6 +2,7 @@
  * Copyright 2010-2021 JetBrains s.r.o. and Kotlin Programming Language contributors.
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class)
 
 fun thrower() : Nothing {
     throw Exception()
diff --git a/kotlin-native/backend.native/tests/framework/stacktraceByLibbacktrace/stacktraceByLibbacktrace.kt b/kotlin-native/backend.native/tests/framework/stacktraceByLibbacktrace/stacktraceByLibbacktrace.kt
index 03635e59637..23261093ccb 100644
--- a/kotlin-native/backend.native/tests/framework/stacktraceByLibbacktrace/stacktraceByLibbacktrace.kt
+++ b/kotlin-native/backend.native/tests/framework/stacktraceByLibbacktrace/stacktraceByLibbacktrace.kt
@@ -2,6 +2,7 @@
  * Copyright 2010-2021 JetBrains s.r.o. and Kotlin Programming Language contributors.
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class)
 
 inline fun inner2() : Nothing {
     throw Exception()
diff --git a/kotlin-native/backend.native/tests/framework/stacktraceByLibbacktrace/stacktraceByLibbacktrace.swift b/kotlin-native/backend.native/tests/framework/stacktraceByLibbacktrace/stacktraceByLibbacktrace.swift
index 8343c48f979..bff17ba629d 100644
--- a/kotlin-native/backend.native/tests/framework/stacktraceByLibbacktrace/stacktraceByLibbacktrace.swift
+++ b/kotlin-native/backend.native/tests/framework/stacktraceByLibbacktrace/stacktraceByLibbacktrace.swift
@@ -3,10 +3,10 @@ import StacktraceByLibbacktrace
 
 func testStackTrace() throws {
     let trace = StacktraceByLibbacktraceKt.getStackTrace()
-    try assertTrue(trace[0].contains("stacktraceByLibbacktrace.kt:7"))
+    try assertTrue(trace[0].contains("stacktraceByLibbacktrace.kt:8"))
     try assertTrue(trace[0].contains("[inlined]"))
-    try assertTrue(trace[1].contains("stacktraceByLibbacktrace.kt:11"))
-    try assertTrue(trace[2].contains("stacktraceByLibbacktrace.kt:16"))
+    try assertTrue(trace[1].contains("stacktraceByLibbacktrace.kt:12"))
+    try assertTrue(trace[2].contains("stacktraceByLibbacktrace.kt:17"))
     try assertTrue(trace[3].contains("<compiler-generated>"))
     try assertTrue(trace[4].contains("stacktraceByLibbacktrace.swift:5"))
     try assertTrue(trace[5].contains("main.swift:126"))
diff --git a/kotlin-native/backend.native/tests/interop/basics/available_processors.kt b/kotlin-native/backend.native/tests/interop/basics/available_processors.kt
index d1a48d348c4..12e3a830582 100644
--- a/kotlin-native/backend.native/tests/interop/basics/available_processors.kt
+++ b/kotlin-native/backend.native/tests/interop/basics/available_processors.kt
@@ -2,7 +2,7 @@
  * Copyright 2010-2023 JetBrains s.r.o. and Kotlin Programming Language contributors.
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
-@file:OptIn(kotlinx.cinterop.ExperimentalForeignApi::class)
+@file:OptIn(kotlinx.cinterop.ExperimentalForeignApi::class, kotlin.experimental.ExperimentalNativeApi::class)
 
 import kotlin.native.*
 import kotlin.test.*
diff --git a/kotlin-native/backend.native/tests/interop/basics/globals.kt b/kotlin-native/backend.native/tests/interop/basics/globals.kt
index dbb6696d925..df57370636a 100644
--- a/kotlin-native/backend.native/tests/interop/basics/globals.kt
+++ b/kotlin-native/backend.native/tests/interop/basics/globals.kt
@@ -2,7 +2,7 @@
  * Copyright 2010-2023 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
  * that can be found in the LICENSE file.
  */
-@file:OptIn(kotlinx.cinterop.ExperimentalForeignApi::class)
+@file:OptIn(kotlinx.cinterop.ExperimentalForeignApi::class, kotlin.experimental.ExperimentalNativeApi::class)
 
 import kotlinx.cinterop.*
 import cglobals.*
diff --git a/kotlin-native/backend.native/tests/interop/basics/macros.kt b/kotlin-native/backend.native/tests/interop/basics/macros.kt
index accb2730d87..6a15b8598d5 100644
--- a/kotlin-native/backend.native/tests/interop/basics/macros.kt
+++ b/kotlin-native/backend.native/tests/interop/basics/macros.kt
@@ -2,7 +2,7 @@
  * Copyright 2010-2023 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
  * that can be found in the LICENSE file.
  */
-@file:OptIn(kotlinx.cinterop.ExperimentalForeignApi::class)
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class, kotlinx.cinterop.ExperimentalForeignApi::class)
 
 import kotlin.test.*
 import cmacros.*
diff --git a/kotlin-native/backend.native/tests/interop/basics/union.kt b/kotlin-native/backend.native/tests/interop/basics/union.kt
index ec115ff1766..b6633800aa5 100644
--- a/kotlin-native/backend.native/tests/interop/basics/union.kt
+++ b/kotlin-native/backend.native/tests/interop/basics/union.kt
@@ -1,4 +1,4 @@
-@file:OptIn(kotlinx.cinterop.ExperimentalForeignApi::class)
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class, kotlinx.cinterop.ExperimentalForeignApi::class)
 
 import cunion.*
 import kotlinx.cinterop.*
diff --git a/kotlin-native/backend.native/tests/interop/basics/vectors.kt b/kotlin-native/backend.native/tests/interop/basics/vectors.kt
index d7ec77daf07..afd227fd9bb 100644
--- a/kotlin-native/backend.native/tests/interop/basics/vectors.kt
+++ b/kotlin-native/backend.native/tests/interop/basics/vectors.kt
@@ -1,4 +1,4 @@
-@file:OptIn(kotlinx.cinterop.ExperimentalForeignApi::class)
+@file:OptIn(kotlinx.cinterop.ExperimentalForeignApi::class, kotlin.experimental.ExperimentalNativeApi::class)
 
 import kotlinx.cinterop.*
 import kotlin.native.*
diff --git a/kotlin-native/backend.native/tests/interop/kt42397/knlibrary.kt b/kotlin-native/backend.native/tests/interop/kt42397/knlibrary.kt
index f58807bc0c1..dfc2c06951a 100644
--- a/kotlin-native/backend.native/tests/interop/kt42397/knlibrary.kt
+++ b/kotlin-native/backend.native/tests/interop/kt42397/knlibrary.kt
@@ -1,3 +1,4 @@
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class)
 package knlibrary
 
 import kotlin.native.Platform
diff --git a/kotlin-native/backend.native/tests/interop/kt56182_package1lvl/knlibrary.kt b/kotlin-native/backend.native/tests/interop/kt56182_package1lvl/knlibrary.kt
index 3a5bda9ae83..7d064168efe 100644
--- a/kotlin-native/backend.native/tests/interop/kt56182_package1lvl/knlibrary.kt
+++ b/kotlin-native/backend.native/tests/interop/kt56182_package1lvl/knlibrary.kt
@@ -1,5 +1,6 @@
 // This test is similar to kt42397, just everything is doubled: in "package knlibrary" and the root package
 
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class)
 package knlibrary
 
 import kotlin.native.Platform
diff --git a/kotlin-native/backend.native/tests/interop/kt56182_root/knlibrary.kt b/kotlin-native/backend.native/tests/interop/kt56182_root/knlibrary.kt
index eda4a1dc2af..5cbf1efeb88 100644
--- a/kotlin-native/backend.native/tests/interop/kt56182_root/knlibrary.kt
+++ b/kotlin-native/backend.native/tests/interop/kt56182_root/knlibrary.kt
@@ -1,5 +1,7 @@
 // This test is similar to kt42397, just everything is in root package instead of "package knlibrary"
 
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class)
+
 import kotlin.native.Platform
 
 // The following 2 singletons are unused. However, since we are generating C bindings for them,
diff --git a/kotlin-native/backend.native/tests/interop/kt56182_root_package1lvl/knlibrary.kt b/kotlin-native/backend.native/tests/interop/kt56182_root_package1lvl/knlibrary.kt
index f196b2167f1..4e0c8d619c2 100644
--- a/kotlin-native/backend.native/tests/interop/kt56182_root_package1lvl/knlibrary.kt
+++ b/kotlin-native/backend.native/tests/interop/kt56182_root_package1lvl/knlibrary.kt
@@ -1,6 +1,7 @@
 // This test is similar to kt42397, just everything is doubled: in "package knlibrary.subpackage" and the root package
 
 // FILE: FirstLevelPackage.kt
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class)
 package knlibrary
 
 import kotlin.native.Platform
@@ -19,6 +20,8 @@ fun enableMemoryChecker() {
 }
 
 // FILE: rootPackage.kt
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class)
+
 object A {}
 
 class B {
diff --git a/kotlin-native/backend.native/tests/interop/kt56182_root_subpackage2lvl/knlibrary.kt b/kotlin-native/backend.native/tests/interop/kt56182_root_subpackage2lvl/knlibrary.kt
index 6847aeaacad..12e48db5d5f 100644
--- a/kotlin-native/backend.native/tests/interop/kt56182_root_subpackage2lvl/knlibrary.kt
+++ b/kotlin-native/backend.native/tests/interop/kt56182_root_subpackage2lvl/knlibrary.kt
@@ -1,6 +1,7 @@
 // This test is similar to kt42397, just everything is doubled: in "package knlibrary.subpackage" and the root package
 
 // FILE: SecondLevelPackage.kt
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class)
 package knlibrary.subpackage
 
 import kotlin.native.Platform
@@ -19,6 +20,8 @@ fun enableMemoryChecker() {
 }
 
 // FILE: rootPackage.kt
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class)
+
 object A {}
 
 class B {
diff --git a/kotlin-native/backend.native/tests/interop/kt56182_subpackage2lvl/knlibrary.kt b/kotlin-native/backend.native/tests/interop/kt56182_subpackage2lvl/knlibrary.kt
index 88b182a214e..39201cb561b 100644
--- a/kotlin-native/backend.native/tests/interop/kt56182_subpackage2lvl/knlibrary.kt
+++ b/kotlin-native/backend.native/tests/interop/kt56182_subpackage2lvl/knlibrary.kt
@@ -1,4 +1,5 @@
 // This test is similar to kt42397, just everything is in "package knlibrary.subpackage" instead of "package knlibrary"
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class)
 package knlibrary.subpackage
 
 import kotlin.native.Platform
diff --git a/kotlin-native/backend.native/tests/interop/leakMemoryWithRunningThread/checked.kt b/kotlin-native/backend.native/tests/interop/leakMemoryWithRunningThread/checked.kt
index 728df757229..cc4c4c390bd 100644
--- a/kotlin-native/backend.native/tests/interop/leakMemoryWithRunningThread/checked.kt
+++ b/kotlin-native/backend.native/tests/interop/leakMemoryWithRunningThread/checked.kt
@@ -1,4 +1,4 @@
-@file:OptIn(kotlin.native.runtime.NativeRuntimeApi::class)
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class, kotlin.native.runtime.NativeRuntimeApi::class)
 
 import leakMemory.*
 import kotlin.native.concurrent.*
diff --git a/kotlin-native/backend.native/tests/interop/leakMemoryWithRunningThread/unchecked.kt b/kotlin-native/backend.native/tests/interop/leakMemoryWithRunningThread/unchecked.kt
index a7dfb14e974..0caa39536aa 100644
--- a/kotlin-native/backend.native/tests/interop/leakMemoryWithRunningThread/unchecked.kt
+++ b/kotlin-native/backend.native/tests/interop/leakMemoryWithRunningThread/unchecked.kt
@@ -1,4 +1,4 @@
-@file:OptIn(kotlin.native.runtime.NativeRuntimeApi::class)
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class, kotlin.native.runtime.NativeRuntimeApi::class)
 
 import leakMemory.*
 import kotlin.native.concurrent.*
diff --git a/kotlin-native/backend.native/tests/interop/objc/kt42172/main.kt b/kotlin-native/backend.native/tests/interop/objc/kt42172/main.kt
index 81afe21686f..a1d05db3473 100644
--- a/kotlin-native/backend.native/tests/interop/objc/kt42172/main.kt
+++ b/kotlin-native/backend.native/tests/interop/objc/kt42172/main.kt
@@ -1,4 +1,4 @@
-@file:OptIn(kotlin.native.runtime.NativeRuntimeApi::class, ObsoleteWorkersApi::class)
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class, kotlin.native.runtime.NativeRuntimeApi::class, ObsoleteWorkersApi::class)
 
 import objclib.*
 import kotlin.native.concurrent.*
diff --git a/kotlin-native/backend.native/tests/interop/objc/kt56402/main.kt b/kotlin-native/backend.native/tests/interop/objc/kt56402/main.kt
index eca4bdee3ae..c9500698f21 100644
--- a/kotlin-native/backend.native/tests/interop/objc/kt56402/main.kt
+++ b/kotlin-native/backend.native/tests/interop/objc/kt56402/main.kt
@@ -2,6 +2,7 @@
  * Copyright 2010-2023 JetBrains s.r.o. and Kotlin Programming Language contributors.
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class)
 
 import objclib.*
 
diff --git a/kotlin-native/backend.native/tests/interop/objc/smoke.kt b/kotlin-native/backend.native/tests/interop/objc/smoke.kt
index 1dd71a645c2..3d9fb5e5c91 100644
--- a/kotlin-native/backend.native/tests/interop/objc/smoke.kt
+++ b/kotlin-native/backend.native/tests/interop/objc/smoke.kt
@@ -2,7 +2,7 @@
  * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
  * that can be found in the LICENSE file.
  */
-@file:OptIn(kotlin.native.runtime.NativeRuntimeApi::class)
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class, kotlin.native.runtime.NativeRuntimeApi::class)
 
 import kotlinx.cinterop.*
 import objcSmoke.*
diff --git a/kotlin-native/backend.native/tests/interop/objc/smoke_noopgc.kt b/kotlin-native/backend.native/tests/interop/objc/smoke_noopgc.kt
index 1dd71a645c2..3d9fb5e5c91 100644
--- a/kotlin-native/backend.native/tests/interop/objc/smoke_noopgc.kt
+++ b/kotlin-native/backend.native/tests/interop/objc/smoke_noopgc.kt
@@ -2,7 +2,7 @@
  * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
  * that can be found in the LICENSE file.
  */
-@file:OptIn(kotlin.native.runtime.NativeRuntimeApi::class)
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class, kotlin.native.runtime.NativeRuntimeApi::class)
 
 import kotlinx.cinterop.*
 import objcSmoke.*
diff --git a/kotlin-native/backend.native/tests/interop/objc/tests/detachObjCObject.kt b/kotlin-native/backend.native/tests/interop/objc/tests/detachObjCObject.kt
index 614f13c3637..ebe51573a48 100644
--- a/kotlin-native/backend.native/tests/interop/objc/tests/detachObjCObject.kt
+++ b/kotlin-native/backend.native/tests/interop/objc/tests/detachObjCObject.kt
@@ -2,6 +2,7 @@
  * Copyright 2010-2023 JetBrains s.r.o. and Kotlin Programming Language contributors.
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class, kotlin.native.runtime.NativeRuntimeApi::class)
 
 import kotlin.test.*
 import kotlin.native.ref.WeakReference
diff --git a/kotlin-native/backend.native/tests/interop/objc/tests/kt41811.kt b/kotlin-native/backend.native/tests/interop/objc/tests/kt41811.kt
index 752f0dc4ab1..cd7f48da7ca 100644
--- a/kotlin-native/backend.native/tests/interop/objc/tests/kt41811.kt
+++ b/kotlin-native/backend.native/tests/interop/objc/tests/kt41811.kt
@@ -1,4 +1,4 @@
-@file:OptIn(kotlin.native.runtime.NativeRuntimeApi::class)
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class, kotlin.native.runtime.NativeRuntimeApi::class)
 
 import kotlin.native.ref.WeakReference
 import kotlinx.cinterop.*
diff --git a/kotlin-native/backend.native/tests/interop/objc/tests/main.kt b/kotlin-native/backend.native/tests/interop/objc/tests/main.kt
index 178c49725de..a785df5e774 100644
--- a/kotlin-native/backend.native/tests/interop/objc/tests/main.kt
+++ b/kotlin-native/backend.native/tests/interop/objc/tests/main.kt
@@ -1,3 +1,5 @@
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class)
+
 import kotlin.system.exitProcess
 import kotlinx.cinterop.autoreleasepool
 import kotlin.native.internal.test.testLauncherEntryPoint
diff --git a/kotlin-native/backend.native/tests/interop/objc/tests/sharing.kt b/kotlin-native/backend.native/tests/interop/objc/tests/sharing.kt
index ebe04c3c886..aafafcadad6 100644
--- a/kotlin-native/backend.native/tests/interop/objc/tests/sharing.kt
+++ b/kotlin-native/backend.native/tests/interop/objc/tests/sharing.kt
@@ -1,4 +1,4 @@
-@file:OptIn(FreezingIsDeprecated::class, ObsoleteWorkersApi::class)
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class, FreezingIsDeprecated::class, ObsoleteWorkersApi::class)
 
 import kotlinx.cinterop.*
 import kotlin.native.concurrent.*
diff --git a/kotlin-native/backend.native/tests/interop/objc/tests/weakRefs.kt b/kotlin-native/backend.native/tests/interop/objc/tests/weakRefs.kt
index 3d863229d3b..612e6077d25 100644
--- a/kotlin-native/backend.native/tests/interop/objc/tests/weakRefs.kt
+++ b/kotlin-native/backend.native/tests/interop/objc/tests/weakRefs.kt
@@ -1,4 +1,4 @@
-@file:OptIn(kotlin.native.runtime.NativeRuntimeApi::class)
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class, kotlin.native.runtime.NativeRuntimeApi::class)
 
 import kotlin.native.ref.*
 import kotlinx.cinterop.*
diff --git a/kotlin-native/backend.native/tests/interop/objc_with_initializer/objc_test.kt b/kotlin-native/backend.native/tests/interop/objc_with_initializer/objc_test.kt
index fc7dd5e1de7..93387a16e6a 100644
--- a/kotlin-native/backend.native/tests/interop/objc_with_initializer/objc_test.kt
+++ b/kotlin-native/backend.native/tests/interop/objc_with_initializer/objc_test.kt
@@ -1,3 +1,5 @@
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class)
+
 import objc_misc.*
 import kotlin.native.Platform
 
diff --git a/kotlin-native/backend.native/tests/interop/threadStates/unhandledException.kt b/kotlin-native/backend.native/tests/interop/threadStates/unhandledException.kt
index 1d6f79b56ae..e894033a809 100644
--- a/kotlin-native/backend.native/tests/interop/threadStates/unhandledException.kt
+++ b/kotlin-native/backend.native/tests/interop/threadStates/unhandledException.kt
@@ -2,7 +2,7 @@
  * Copyright 2010-2021 JetBrains s.r.o. and Kotlin Programming Language contributors.
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
-@file:OptIn(FreezingIsDeprecated::class, ExperimentalStdlibApi::class, kotlin.native.runtime.NativeRuntimeApi::class)
+@file:OptIn(FreezingIsDeprecated::class, kotlin.experimental.ExperimentalNativeApi::class, kotlin.native.runtime.NativeRuntimeApi::class)
 
 import kotlin.native.concurrent.*
 import kotlin.native.runtime.Debugging
diff --git a/kotlin-native/backend.native/tests/interop/threadStates/unhandledExceptionInForeignThread.kt b/kotlin-native/backend.native/tests/interop/threadStates/unhandledExceptionInForeignThread.kt
index 82a71a7cf71..471652f51be 100644
--- a/kotlin-native/backend.native/tests/interop/threadStates/unhandledExceptionInForeignThread.kt
+++ b/kotlin-native/backend.native/tests/interop/threadStates/unhandledExceptionInForeignThread.kt
@@ -2,7 +2,7 @@
  * Copyright 2010-2021 JetBrains s.r.o. and Kotlin Programming Language contributors.
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
-@file:OptIn(FreezingIsDeprecated::class, ExperimentalStdlibApi::class, kotlin.native.runtime.NativeRuntimeApi::class)
+@file:OptIn(FreezingIsDeprecated::class, kotlin.experimental.ExperimentalNativeApi::class, kotlin.native.runtime.NativeRuntimeApi::class)
 
 import kotlin.native.concurrent.*
 import kotlin.native.runtime.Debugging
diff --git a/kotlin-native/backend.native/tests/objcexport/coroutines.kt b/kotlin-native/backend.native/tests/objcexport/coroutines.kt
index 6e5259957f3..b410bf98b9e 100644
--- a/kotlin-native/backend.native/tests/objcexport/coroutines.kt
+++ b/kotlin-native/backend.native/tests/objcexport/coroutines.kt
@@ -244,4 +244,5 @@ fun createCoroutineUninterceptedAndResume(fn: suspend () -> Any?, resultHolder:
 fun createCoroutineUninterceptedAndResume(fn: suspend Any?.() -> Any?, receiver: Any?, resultHolder: ResultHolder<Any?>) =
         fn.createCoroutine(receiver, ResultHolderCompletion(resultHolder)).resume(Unit)
 
+@OptIn(kotlin.native.runtime.NativeRuntimeApi::class)
 fun gc() = kotlin.native.runtime.GC.collect()
diff --git a/kotlin-native/backend.native/tests/objcexport/deallocRetain.kt b/kotlin-native/backend.native/tests/objcexport/deallocRetain.kt
index 5ed8b84dc6e..b01402f0b20 100644
--- a/kotlin-native/backend.native/tests/objcexport/deallocRetain.kt
+++ b/kotlin-native/backend.native/tests/objcexport/deallocRetain.kt
@@ -3,6 +3,7 @@
  * that can be found in the LICENSE file.
  */
 
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class)
 package deallocretain
 
 open class DeallocRetainBase
diff --git a/kotlin-native/backend.native/tests/objcexport/noAutorelease.kt b/kotlin-native/backend.native/tests/objcexport/noAutorelease.kt
index 652ac291b45..99e0fa2487f 100644
--- a/kotlin-native/backend.native/tests/objcexport/noAutorelease.kt
+++ b/kotlin-native/backend.native/tests/objcexport/noAutorelease.kt
@@ -6,6 +6,7 @@ import kotlin.native.internal.NativePtr
 import kotlin.native.ref.WeakReference
 import kotlin.test.*
 
+@OptIn(kotlin.experimental.ExperimentalNativeApi::class)
 class KotlinLivenessTracker {
     val weakRefs = mutableListOf<WeakReference<Any>>()
 
diff --git a/kotlin-native/backend.native/tests/objcexport/values.kt b/kotlin-native/backend.native/tests/objcexport/values.kt
index 6feabe7a936..ba783ddc151 100644
--- a/kotlin-native/backend.native/tests/objcexport/values.kt
+++ b/kotlin-native/backend.native/tests/objcexport/values.kt
@@ -5,7 +5,7 @@
 
 // All classes and methods should be used in tests
 @file:Suppress("UNUSED")
-@file:OptIn(FreezingIsDeprecated::class, kotlin.native.runtime.NativeRuntimeApi::class)
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class, FreezingIsDeprecated::class, kotlin.native.runtime.NativeRuntimeApi::class)
 
 package conversions
 
@@ -251,6 +251,7 @@ fun IC3.getValue3() = value
 fun IC3?.getValueOrNull3() = this?.value
 
 fun isFrozen(obj: Any): Boolean = obj.isFrozen
+@OptIn(kotlin.experimental.ExperimentalNativeApi::class)
 fun isFreezingEnabled() = Platform.isFreezingEnabled
 fun kotlinLambda(block: (Any) -> Any): Any = block
 
diff --git a/kotlin-native/backend.native/tests/runtime/atomics/atomic0.kt b/kotlin-native/backend.native/tests/runtime/atomics/atomic0.kt
index 2d241525ed2..a4660b48206 100644
--- a/kotlin-native/backend.native/tests/runtime/atomics/atomic0.kt
+++ b/kotlin-native/backend.native/tests/runtime/atomics/atomic0.kt
@@ -3,7 +3,7 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
-@file:OptIn(FreezingIsDeprecated::class, ObsoleteWorkersApi::class)
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class, FreezingIsDeprecated::class, ObsoleteWorkersApi::class)
 package runtime.atomics.atomic0
 
 import kotlin.test.*
diff --git a/kotlin-native/backend.native/tests/runtime/basic/assert_failed.kt b/kotlin-native/backend.native/tests/runtime/basic/assert_failed.kt
index e8f91168394..becb0e81d67 100644
--- a/kotlin-native/backend.native/tests/runtime/basic/assert_failed.kt
+++ b/kotlin-native/backend.native/tests/runtime/basic/assert_failed.kt
@@ -2,6 +2,7 @@
  * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
  * that can be found in the LICENSE file.
  */
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class)
 
 fun main(args: Array<String>) {
     assert(false)
diff --git a/kotlin-native/backend.native/tests/runtime/basic/assert_passed.kt b/kotlin-native/backend.native/tests/runtime/basic/assert_passed.kt
index d49eacc0642..9dca874b92a 100644
--- a/kotlin-native/backend.native/tests/runtime/basic/assert_passed.kt
+++ b/kotlin-native/backend.native/tests/runtime/basic/assert_passed.kt
@@ -2,6 +2,7 @@
  * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
  * that can be found in the LICENSE file.
  */
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class)
 
 fun main(args: Array<String>) {
     assert(true)
diff --git a/kotlin-native/backend.native/tests/runtime/basic/cleaner_basic.kt b/kotlin-native/backend.native/tests/runtime/basic/cleaner_basic.kt
index 1b2a752337d..7863e5fb757 100644
--- a/kotlin-native/backend.native/tests/runtime/basic/cleaner_basic.kt
+++ b/kotlin-native/backend.native/tests/runtime/basic/cleaner_basic.kt
@@ -2,7 +2,7 @@
  * Copyright 2010-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
  * that can be found in the LICENSE file.
  */
-@file:OptIn(ExperimentalStdlibApi::class, FreezingIsDeprecated::class,
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class, FreezingIsDeprecated::class,
         kotlin.native.runtime.NativeRuntimeApi::class, kotlinx.cinterop.ExperimentalForeignApi::class)
 
 package runtime.basic.cleaner_basic
diff --git a/kotlin-native/backend.native/tests/runtime/basic/cleaner_in_main_with_checker.kt b/kotlin-native/backend.native/tests/runtime/basic/cleaner_in_main_with_checker.kt
index 7cb79424169..397d2dbaa65 100644
--- a/kotlin-native/backend.native/tests/runtime/basic/cleaner_in_main_with_checker.kt
+++ b/kotlin-native/backend.native/tests/runtime/basic/cleaner_in_main_with_checker.kt
@@ -2,7 +2,7 @@
  * Copyright 2010-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
  * that can be found in the LICENSE file.
  */
-@file:OptIn(ExperimentalStdlibApi::class)
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class)
 
 import kotlin.native.ref.Cleaner
 import kotlin.native.ref.createCleaner
diff --git a/kotlin-native/backend.native/tests/runtime/basic/cleaner_in_main_without_checker.kt b/kotlin-native/backend.native/tests/runtime/basic/cleaner_in_main_without_checker.kt
index c8463daaad9..6bd1005c893 100644
--- a/kotlin-native/backend.native/tests/runtime/basic/cleaner_in_main_without_checker.kt
+++ b/kotlin-native/backend.native/tests/runtime/basic/cleaner_in_main_without_checker.kt
@@ -2,7 +2,7 @@
  * Copyright 2010-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
  * that can be found in the LICENSE file.
  */
-@file:OptIn(ExperimentalStdlibApi::class)
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class)
 
 import kotlin.native.ref.createCleaner
 import kotlin.native.Platform
diff --git a/kotlin-native/backend.native/tests/runtime/basic/cleaner_in_tls_main_with_checker.kt b/kotlin-native/backend.native/tests/runtime/basic/cleaner_in_tls_main_with_checker.kt
index 5c893021335..7478e31d307 100644
--- a/kotlin-native/backend.native/tests/runtime/basic/cleaner_in_tls_main_with_checker.kt
+++ b/kotlin-native/backend.native/tests/runtime/basic/cleaner_in_tls_main_with_checker.kt
@@ -2,7 +2,7 @@
  * Copyright 2010-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
  * that can be found in the LICENSE file.
  */
-@file:OptIn(ExperimentalStdlibApi::class)
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class)
 
 import kotlin.test.*
 
diff --git a/kotlin-native/backend.native/tests/runtime/basic/cleaner_in_tls_main_without_checker.kt b/kotlin-native/backend.native/tests/runtime/basic/cleaner_in_tls_main_without_checker.kt
index 82da27b8ca6..1a3fe810ad4 100644
--- a/kotlin-native/backend.native/tests/runtime/basic/cleaner_in_tls_main_without_checker.kt
+++ b/kotlin-native/backend.native/tests/runtime/basic/cleaner_in_tls_main_without_checker.kt
@@ -2,7 +2,7 @@
  * Copyright 2010-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
  * that can be found in the LICENSE file.
  */
-@file:OptIn(ExperimentalStdlibApi::class)
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class)
 
 import kotlin.test.*
 
diff --git a/kotlin-native/backend.native/tests/runtime/basic/cleaner_in_tls_worker.kt b/kotlin-native/backend.native/tests/runtime/basic/cleaner_in_tls_worker.kt
index dae92c720e0..c757d47c7c0 100644
--- a/kotlin-native/backend.native/tests/runtime/basic/cleaner_in_tls_worker.kt
+++ b/kotlin-native/backend.native/tests/runtime/basic/cleaner_in_tls_worker.kt
@@ -2,7 +2,7 @@
  * Copyright 2010-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
  * that can be found in the LICENSE file.
  */
-@file:OptIn(ExperimentalStdlibApi::class, kotlin.native.runtime.NativeRuntimeApi::class, ObsoleteWorkersApi::class)
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class, kotlin.native.runtime.NativeRuntimeApi::class, ObsoleteWorkersApi::class)
 
 import kotlin.test.*
 
diff --git a/kotlin-native/backend.native/tests/runtime/basic/cleaner_leak_with_checker.kt b/kotlin-native/backend.native/tests/runtime/basic/cleaner_leak_with_checker.kt
index 8a2d5909de0..be422caeeee 100644
--- a/kotlin-native/backend.native/tests/runtime/basic/cleaner_leak_with_checker.kt
+++ b/kotlin-native/backend.native/tests/runtime/basic/cleaner_leak_with_checker.kt
@@ -2,7 +2,7 @@
  * Copyright 2010-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
  * that can be found in the LICENSE file.
  */
-@file:OptIn(ExperimentalStdlibApi::class)
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class)
 
 import kotlin.test.*
 
diff --git a/kotlin-native/backend.native/tests/runtime/basic/cleaner_leak_without_checker.kt b/kotlin-native/backend.native/tests/runtime/basic/cleaner_leak_without_checker.kt
index 1c9cf7fef0b..b034df09e96 100644
--- a/kotlin-native/backend.native/tests/runtime/basic/cleaner_leak_without_checker.kt
+++ b/kotlin-native/backend.native/tests/runtime/basic/cleaner_leak_without_checker.kt
@@ -2,7 +2,7 @@
  * Copyright 2010-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
  * that can be found in the LICENSE file.
  */
-@file:OptIn(ExperimentalStdlibApi::class)
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class)
 
 import kotlin.test.*
 
diff --git a/kotlin-native/backend.native/tests/runtime/collections/array5.kt b/kotlin-native/backend.native/tests/runtime/collections/array5.kt
index 0128eaa0db0..b56998951cf 100644
--- a/kotlin-native/backend.native/tests/runtime/collections/array5.kt
+++ b/kotlin-native/backend.native/tests/runtime/collections/array5.kt
@@ -2,7 +2,7 @@
  * Copyright 2010-2023 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
  * that can be found in the LICENSE file.
  */
-@file:OptIn(kotlinx.cinterop.ExperimentalForeignApi::class)
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class, kotlinx.cinterop.ExperimentalForeignApi::class)
 
 package runtime.collections.array5
 
diff --git a/kotlin-native/backend.native/tests/runtime/collections/hash_map1.kt b/kotlin-native/backend.native/tests/runtime/collections/hash_map1.kt
index eb5c46be882..a5ab90aefdc 100644
--- a/kotlin-native/backend.native/tests/runtime/collections/hash_map1.kt
+++ b/kotlin-native/backend.native/tests/runtime/collections/hash_map1.kt
@@ -5,8 +5,6 @@
 
 package runtime.collections.hash_map1
 
-import kotlin.native.MemoryModel
-import kotlin.native.Platform
 import kotlin.test.*
 
 fun assertTrue(cond: Boolean) {
diff --git a/kotlin-native/backend.native/tests/runtime/collections/typed_array0.kt b/kotlin-native/backend.native/tests/runtime/collections/typed_array0.kt
index e2baf4f40d9..eea1fd7f4bb 100644
--- a/kotlin-native/backend.native/tests/runtime/collections/typed_array0.kt
+++ b/kotlin-native/backend.native/tests/runtime/collections/typed_array0.kt
@@ -2,6 +2,7 @@
  * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
  * that can be found in the LICENSE file.
  */
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class)
 
 package runtime.collections.typed_array0
 
diff --git a/kotlin-native/backend.native/tests/runtime/collections/typed_array1.kt b/kotlin-native/backend.native/tests/runtime/collections/typed_array1.kt
index c21af9769a1..5a8cac2d01c 100644
--- a/kotlin-native/backend.native/tests/runtime/collections/typed_array1.kt
+++ b/kotlin-native/backend.native/tests/runtime/collections/typed_array1.kt
@@ -3,7 +3,7 @@
  * that can be found in the LICENSE file.
  */
 
-@file:OptIn(FreezingIsDeprecated::class)
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class, FreezingIsDeprecated::class)
 package runtime.collections.typed_array1
 
 import kotlin.test.*
diff --git a/kotlin-native/backend.native/tests/runtime/concurrent/worker_bound_reference0.kt b/kotlin-native/backend.native/tests/runtime/concurrent/worker_bound_reference0.kt
index 9036516069f..535e2a723e6 100644
--- a/kotlin-native/backend.native/tests/runtime/concurrent/worker_bound_reference0.kt
+++ b/kotlin-native/backend.native/tests/runtime/concurrent/worker_bound_reference0.kt
@@ -2,7 +2,7 @@
  * Copyright 2010-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
  * that can be found in the LICENSE file.
  */
-@file:OptIn(FreezingIsDeprecated::class, kotlin.native.runtime.NativeRuntimeApi::class, ObsoleteWorkersApi::class)
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class, FreezingIsDeprecated::class, kotlin.native.runtime.NativeRuntimeApi::class, ObsoleteWorkersApi::class)
 
 package runtime.concurrent.worker_bound_reference0
 
diff --git a/kotlin-native/backend.native/tests/runtime/exceptions/check_stacktrace_format.kt b/kotlin-native/backend.native/tests/runtime/exceptions/check_stacktrace_format.kt
index 19ce86f2019..2488a0525e2 100644
--- a/kotlin-native/backend.native/tests/runtime/exceptions/check_stacktrace_format.kt
+++ b/kotlin-native/backend.native/tests/runtime/exceptions/check_stacktrace_format.kt
@@ -2,6 +2,8 @@
 // "\tat 1   main.kexe\t\t 0x000000010d7cdb4c kfun:package.function(kotlin.Int) + 108 (/path/to/file/name.kt:10:27)\n"
 // If test is broken, org.jetbrains.kotlin.idea.filters.KotlinExceptionFilter (in main Kotlin repo) should be updated.
 
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class)
+
 import kotlin.test.*
 import kotlin.text.Regex
 
diff --git a/kotlin-native/backend.native/tests/runtime/exceptions/custom_hook_get.kt b/kotlin-native/backend.native/tests/runtime/exceptions/custom_hook_get.kt
index e5e8336fb7c..c32a2aff635 100644
--- a/kotlin-native/backend.native/tests/runtime/exceptions/custom_hook_get.kt
+++ b/kotlin-native/backend.native/tests/runtime/exceptions/custom_hook_get.kt
@@ -2,7 +2,7 @@
  * Copyright 2010-2021 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
  * that can be found in the LICENSE file.
  */
-@file:OptIn(ExperimentalStdlibApi::class, FreezingIsDeprecated::class)
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class, FreezingIsDeprecated::class)
 
 import kotlin.test.*
 
diff --git a/kotlin-native/backend.native/tests/runtime/exceptions/custom_hook_no_reset.kt b/kotlin-native/backend.native/tests/runtime/exceptions/custom_hook_no_reset.kt
index 6a284e3f931..50b625987e4 100644
--- a/kotlin-native/backend.native/tests/runtime/exceptions/custom_hook_no_reset.kt
+++ b/kotlin-native/backend.native/tests/runtime/exceptions/custom_hook_no_reset.kt
@@ -2,7 +2,7 @@
  * Copyright 2010-2021 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
  * that can be found in the LICENSE file.
  */
-@file:OptIn(ExperimentalStdlibApi::class, FreezingIsDeprecated::class)
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class, FreezingIsDeprecated::class)
 
 import kotlin.test.*
 
diff --git a/kotlin-native/backend.native/tests/runtime/exceptions/custom_hook_terminate.kt b/kotlin-native/backend.native/tests/runtime/exceptions/custom_hook_terminate.kt
index 22d315fee29..b6488fe2c79 100644
--- a/kotlin-native/backend.native/tests/runtime/exceptions/custom_hook_terminate.kt
+++ b/kotlin-native/backend.native/tests/runtime/exceptions/custom_hook_terminate.kt
@@ -2,7 +2,7 @@
  * Copyright 2010-2021 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
  * that can be found in the LICENSE file.
  */
-@file:OptIn(ExperimentalStdlibApi::class, FreezingIsDeprecated::class)
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class, FreezingIsDeprecated::class)
 
 import kotlin.test.*
 
diff --git a/kotlin-native/backend.native/tests/runtime/exceptions/custom_hook_terminate_unhandled_exception.kt b/kotlin-native/backend.native/tests/runtime/exceptions/custom_hook_terminate_unhandled_exception.kt
index e78b921642b..351f5125a06 100644
--- a/kotlin-native/backend.native/tests/runtime/exceptions/custom_hook_terminate_unhandled_exception.kt
+++ b/kotlin-native/backend.native/tests/runtime/exceptions/custom_hook_terminate_unhandled_exception.kt
@@ -2,7 +2,7 @@
  * Copyright 2010-2021 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
  * that can be found in the LICENSE file.
  */
-@file:OptIn(ExperimentalStdlibApi::class, FreezingIsDeprecated::class)
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class, FreezingIsDeprecated::class)
 
 import kotlin.test.*
 
diff --git a/kotlin-native/backend.native/tests/runtime/exceptions/custom_hook_unhandled_exception.kt b/kotlin-native/backend.native/tests/runtime/exceptions/custom_hook_unhandled_exception.kt
index b448aea61f3..4c598c6ea75 100644
--- a/kotlin-native/backend.native/tests/runtime/exceptions/custom_hook_unhandled_exception.kt
+++ b/kotlin-native/backend.native/tests/runtime/exceptions/custom_hook_unhandled_exception.kt
@@ -2,7 +2,7 @@
  * Copyright 2010-2021 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
  * that can be found in the LICENSE file.
  */
-@file:OptIn(ExperimentalStdlibApi::class, FreezingIsDeprecated::class)
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class, FreezingIsDeprecated::class)
 
 import kotlin.test.*
 
diff --git a/kotlin-native/backend.native/tests/runtime/exceptions/except_constr_w_default.kt b/kotlin-native/backend.native/tests/runtime/exceptions/except_constr_w_default.kt
index e07d0b9b243..74ecf48770e 100644
--- a/kotlin-native/backend.native/tests/runtime/exceptions/except_constr_w_default.kt
+++ b/kotlin-native/backend.native/tests/runtime/exceptions/except_constr_w_default.kt
@@ -1,3 +1,5 @@
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class)
+
 import kotlin.text.Regex
 import kotlin.test.*
 
diff --git a/kotlin-native/backend.native/tests/runtime/exceptions/kt-37572.kt b/kotlin-native/backend.native/tests/runtime/exceptions/kt-37572.kt
index aa8f6deef1d..a18f6e37eee 100644
--- a/kotlin-native/backend.native/tests/runtime/exceptions/kt-37572.kt
+++ b/kotlin-native/backend.native/tests/runtime/exceptions/kt-37572.kt
@@ -1,3 +1,5 @@
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class)
+
 import kotlin.text.Regex
 import kotlin.test.*
 
@@ -44,14 +46,14 @@ internal val regex = Regex("^(\\d+)\\ +.*/(.*):(\\d+):.*$")
 internal fun checkFrame(value:String) {
     val goldValues = arrayOf<Pair<String, Int>?>(
             *arrayOfNulls(expectedExceptionContrFrames),
-            "kt-37572.kt" to 40,
-            "kt-37572.kt" to 31,
+            "kt-37572.kt" to 42,
+            "kt-37572.kt" to 33,
             *(if (expectedInlinesCount != 0) arrayOf(
-                    "kt-37572.kt" to 36,
-                    "kt-37572.kt" to 29,
+                    "kt-37572.kt" to 38,
+                    "kt-37572.kt" to 31,
             ) else emptyArray()),
-            "kt-37572.kt" to 19,
-            "kt-37572.kt" to 7)
+            "kt-37572.kt" to 21,
+            "kt-37572.kt" to 9)
 
     val (pos, file, line) = regex.find(value)!!.destructured
     goldValues[pos.toInt()]?.let {
diff --git a/kotlin-native/backend.native/tests/runtime/exceptions/kt-49240-stack-trace-completeness.kt b/kotlin-native/backend.native/tests/runtime/exceptions/kt-49240-stack-trace-completeness.kt
index bdda0adbcd5..17d030f0f2b 100644
--- a/kotlin-native/backend.native/tests/runtime/exceptions/kt-49240-stack-trace-completeness.kt
+++ b/kotlin-native/backend.native/tests/runtime/exceptions/kt-49240-stack-trace-completeness.kt
@@ -1,3 +1,5 @@
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class)
+
 import kotlin.text.Regex
 import kotlin.test.*
 
diff --git a/kotlin-native/backend.native/tests/runtime/exceptions/stack_trace_inline.kt b/kotlin-native/backend.native/tests/runtime/exceptions/stack_trace_inline.kt
index e41137dcd82..dde60fed33f 100644
--- a/kotlin-native/backend.native/tests/runtime/exceptions/stack_trace_inline.kt
+++ b/kotlin-native/backend.native/tests/runtime/exceptions/stack_trace_inline.kt
@@ -1,3 +1,5 @@
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class)
+
 import kotlin.text.Regex
 import kotlin.test.*
 
@@ -34,8 +36,8 @@ internal fun checkFrame(value:String) {
     val goldValues = arrayOf<Pair<String, Int>?>(
             *arrayOfNulls(expectedExceptionContrFrames),
             *arrayOfNulls(expectedInlinesCount),
-            "stack_trace_inline.kt" to 8,
-            "stack_trace_inline.kt" to 23)
+            "stack_trace_inline.kt" to 10,
+            "stack_trace_inline.kt" to 25)
     val (pos, file, line) = regex.find(value)!!.destructured
     goldValues[pos.toInt()]?.let {
         assertEquals(it.first, file)
diff --git a/kotlin-native/backend.native/tests/runtime/exceptions/terminate.kt b/kotlin-native/backend.native/tests/runtime/exceptions/terminate.kt
index 55926607e26..fc48edfd8ca 100644
--- a/kotlin-native/backend.native/tests/runtime/exceptions/terminate.kt
+++ b/kotlin-native/backend.native/tests/runtime/exceptions/terminate.kt
@@ -2,7 +2,7 @@
  * Copyright 2010-2021 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
  * that can be found in the LICENSE file.
  */
-@file:OptIn(ExperimentalStdlibApi::class)
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class)
 
 import kotlin.test.*
 
diff --git a/kotlin-native/backend.native/tests/runtime/exceptions/throw_from_except_constr.kt b/kotlin-native/backend.native/tests/runtime/exceptions/throw_from_except_constr.kt
index 9c875d1e057..fa280dbbc16 100644
--- a/kotlin-native/backend.native/tests/runtime/exceptions/throw_from_except_constr.kt
+++ b/kotlin-native/backend.native/tests/runtime/exceptions/throw_from_except_constr.kt
@@ -1,3 +1,5 @@
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class)
+
 import kotlin.text.Regex
 import kotlin.test.*
 
diff --git a/kotlin-native/backend.native/tests/runtime/exceptions/unhandled_exception.kt b/kotlin-native/backend.native/tests/runtime/exceptions/unhandled_exception.kt
index 526946def26..cf0c135c85b 100644
--- a/kotlin-native/backend.native/tests/runtime/exceptions/unhandled_exception.kt
+++ b/kotlin-native/backend.native/tests/runtime/exceptions/unhandled_exception.kt
@@ -2,7 +2,7 @@
  * Copyright 2010-2021 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
  * that can be found in the LICENSE file.
  */
-@file:OptIn(ExperimentalStdlibApi::class)
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class)
 
 import kotlin.test.*
 
diff --git a/kotlin-native/backend.native/tests/runtime/memory/leak_memory.kt b/kotlin-native/backend.native/tests/runtime/memory/leak_memory.kt
index 0d6351cfaa5..600321eceb4 100644
--- a/kotlin-native/backend.native/tests/runtime/memory/leak_memory.kt
+++ b/kotlin-native/backend.native/tests/runtime/memory/leak_memory.kt
@@ -1,3 +1,5 @@
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class)
+
 import kotlinx.cinterop.*
 import kotlin.native.Platform
 
diff --git a/kotlin-native/backend.native/tests/runtime/memory/leak_memory_test_runner.kt b/kotlin-native/backend.native/tests/runtime/memory/leak_memory_test_runner.kt
index 5facc72141b..bfd109cae66 100644
--- a/kotlin-native/backend.native/tests/runtime/memory/leak_memory_test_runner.kt
+++ b/kotlin-native/backend.native/tests/runtime/memory/leak_memory_test_runner.kt
@@ -1,3 +1,5 @@
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class)
+
 import kotlin.test.*
 
 import kotlinx.cinterop.*
diff --git a/kotlin-native/backend.native/tests/runtime/memory/stable_ref_cross_thread_check.kt b/kotlin-native/backend.native/tests/runtime/memory/stable_ref_cross_thread_check.kt
index 388d16a7e71..4dc2ee2b568 100644
--- a/kotlin-native/backend.native/tests/runtime/memory/stable_ref_cross_thread_check.kt
+++ b/kotlin-native/backend.native/tests/runtime/memory/stable_ref_cross_thread_check.kt
@@ -2,7 +2,7 @@
  * Copyright 2010-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
  * that can be found in the LICENSE file.
  */
-@file:OptIn(FreezingIsDeprecated::class, ObsoleteWorkersApi::class, kotlinx.cinterop.ExperimentalForeignApi::class)
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class, FreezingIsDeprecated::class, ObsoleteWorkersApi::class, kotlinx.cinterop.ExperimentalForeignApi::class)
 
 package runtime.memory.stable_ref_cross_thread_check
 
diff --git a/kotlin-native/backend.native/tests/runtime/memory/stress_gc_allocations.kt b/kotlin-native/backend.native/tests/runtime/memory/stress_gc_allocations.kt
index 6fdb6aa875c..1aba0013850 100644
--- a/kotlin-native/backend.native/tests/runtime/memory/stress_gc_allocations.kt
+++ b/kotlin-native/backend.native/tests/runtime/memory/stress_gc_allocations.kt
@@ -2,7 +2,7 @@
  * Copyright 2010-2021 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
  * that can be found in the LICENSE file.
  */
-@file:OptIn(kotlin.native.runtime.NativeRuntimeApi::class)
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class, kotlin.native.runtime.NativeRuntimeApi::class)
 
 import kotlin.test.*
 
diff --git a/kotlin-native/backend.native/tests/runtime/text/chars0.kt b/kotlin-native/backend.native/tests/runtime/text/chars0.kt
index dc7ead95562..7963474321d 100644
--- a/kotlin-native/backend.native/tests/runtime/text/chars0.kt
+++ b/kotlin-native/backend.native/tests/runtime/text/chars0.kt
@@ -2,6 +2,7 @@
  * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
  * that can be found in the LICENSE file.
  */
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class)
 
 package runtime.text.chars0
 
diff --git a/kotlin-native/backend.native/tests/runtime/text/parse0.kt b/kotlin-native/backend.native/tests/runtime/text/parse0.kt
index 7b22513d345..926ad5e4ae0 100644
--- a/kotlin-native/backend.native/tests/runtime/text/parse0.kt
+++ b/kotlin-native/backend.native/tests/runtime/text/parse0.kt
@@ -2,6 +2,7 @@
  * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
  * that can be found in the LICENSE file.
  */
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class)
 
 package runtime.text.parse0
 
diff --git a/kotlin-native/backend.native/tests/runtime/workers/lazy1.kt b/kotlin-native/backend.native/tests/runtime/workers/lazy1.kt
index 9249f990bf6..88a6da66c19 100644
--- a/kotlin-native/backend.native/tests/runtime/workers/lazy1.kt
+++ b/kotlin-native/backend.native/tests/runtime/workers/lazy1.kt
@@ -3,7 +3,7 @@
  * that can be found in the LICENSE file.
  */
 
-@file:OptIn(FreezingIsDeprecated::class)
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class, FreezingIsDeprecated::class)
 package runtime.workers.lazy1
 
 import kotlin.test.*
diff --git a/kotlin-native/backend.native/tests/runtime/workers/lazy3.kt b/kotlin-native/backend.native/tests/runtime/workers/lazy3.kt
index e0b634b76c4..8b33cf19daa 100644
--- a/kotlin-native/backend.native/tests/runtime/workers/lazy3.kt
+++ b/kotlin-native/backend.native/tests/runtime/workers/lazy3.kt
@@ -1,4 +1,4 @@
-@file:OptIn(FreezingIsDeprecated::class, kotlin.native.runtime.NativeRuntimeApi::class)
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class, FreezingIsDeprecated::class, kotlin.native.runtime.NativeRuntimeApi::class)
 
 import kotlin.native.concurrent.*
 import kotlin.native.ref.*
diff --git a/kotlin-native/backend.native/tests/runtime/workers/lazy4.kt b/kotlin-native/backend.native/tests/runtime/workers/lazy4.kt
index e1ab33f2922..33788adff06 100644
--- a/kotlin-native/backend.native/tests/runtime/workers/lazy4.kt
+++ b/kotlin-native/backend.native/tests/runtime/workers/lazy4.kt
@@ -3,7 +3,7 @@
  * that can be found in the LICENSE file.
  */
 
-@file:OptIn(FreezingIsDeprecated::class, ObsoleteWorkersApi::class)
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class, FreezingIsDeprecated::class, ObsoleteWorkersApi::class)
 package runtime.workers.lazy4
 
 import kotlin.test.*
diff --git a/kotlin-native/backend.native/tests/runtime/workers/leak_memory_with_worker_termination.kt b/kotlin-native/backend.native/tests/runtime/workers/leak_memory_with_worker_termination.kt
index 3460d2d8f36..774d05723e6 100644
--- a/kotlin-native/backend.native/tests/runtime/workers/leak_memory_with_worker_termination.kt
+++ b/kotlin-native/backend.native/tests/runtime/workers/leak_memory_with_worker_termination.kt
@@ -1,4 +1,4 @@
-@file:OptIn(ObsoleteWorkersApi::class)
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class, ObsoleteWorkersApi::class)
 import kotlin.native.concurrent.*
 import kotlin.native.Platform
 import kotlinx.cinterop.*
diff --git a/kotlin-native/backend.native/tests/runtime/workers/leak_worker.kt b/kotlin-native/backend.native/tests/runtime/workers/leak_worker.kt
index 66272ac8306..20beeab01b0 100644
--- a/kotlin-native/backend.native/tests/runtime/workers/leak_worker.kt
+++ b/kotlin-native/backend.native/tests/runtime/workers/leak_worker.kt
@@ -1,4 +1,4 @@
-@file:OptIn(ObsoleteWorkersApi::class)
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class, ObsoleteWorkersApi::class)
 import kotlin.native.concurrent.*
 import kotlin.native.Platform
 import kotlinx.cinterop.*
diff --git a/kotlin-native/backend.native/tests/runtime/workers/worker11.kt b/kotlin-native/backend.native/tests/runtime/workers/worker11.kt
index 14382d6cb1c..30542ba008a 100644
--- a/kotlin-native/backend.native/tests/runtime/workers/worker11.kt
+++ b/kotlin-native/backend.native/tests/runtime/workers/worker11.kt
@@ -3,7 +3,7 @@
  * that can be found in the LICENSE file.
  */
 
-@file:OptIn(FreezingIsDeprecated::class, ObsoleteWorkersApi::class)
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class, FreezingIsDeprecated::class, ObsoleteWorkersApi::class)
 package runtime.workers.worker11
 
 import kotlin.test.*
diff --git a/kotlin-native/backend.native/tests/runtime/workers/worker3.kt b/kotlin-native/backend.native/tests/runtime/workers/worker3.kt
index 6c22dc74282..a9a1d8fe747 100644
--- a/kotlin-native/backend.native/tests/runtime/workers/worker3.kt
+++ b/kotlin-native/backend.native/tests/runtime/workers/worker3.kt
@@ -3,7 +3,7 @@
  * that can be found in the LICENSE file.
  */
 
-@file:OptIn(ObsoleteWorkersApi::class)
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class, ObsoleteWorkersApi::class)
 package runtime.workers.worker3
 
 import kotlin.test.*
diff --git a/kotlin-native/backend.native/tests/runtime/workers/worker6.kt b/kotlin-native/backend.native/tests/runtime/workers/worker6.kt
index 7b3c2668876..146488da499 100644
--- a/kotlin-native/backend.native/tests/runtime/workers/worker6.kt
+++ b/kotlin-native/backend.native/tests/runtime/workers/worker6.kt
@@ -3,7 +3,7 @@
  * that can be found in the LICENSE file.
  */
 
-@file:OptIn(FreezingIsDeprecated::class, ObsoleteWorkersApi::class)
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class, FreezingIsDeprecated::class, ObsoleteWorkersApi::class)
 package runtime.workers.worker6
 
 import kotlin.test.*
diff --git a/kotlin-native/backend.native/tests/runtime/workers/worker9_experimentalMM.kt b/kotlin-native/backend.native/tests/runtime/workers/worker9_experimentalMM.kt
index 1f2773f2ad7..db57a385d33 100644
--- a/kotlin-native/backend.native/tests/runtime/workers/worker9_experimentalMM.kt
+++ b/kotlin-native/backend.native/tests/runtime/workers/worker9_experimentalMM.kt
@@ -3,7 +3,7 @@
  * that can be found in the LICENSE file.
  */
 
-@file:OptIn(FreezingIsDeprecated::class, ObsoleteWorkersApi::class)
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class, FreezingIsDeprecated::class, ObsoleteWorkersApi::class)
 package runtime.workers.worker9_experimentalMM
 
 import kotlin.test.*
diff --git a/kotlin-native/backend.native/tests/runtime/workers/worker_exception_messages.kt b/kotlin-native/backend.native/tests/runtime/workers/worker_exception_messages.kt
index 7ec6a4353e2..be402e353c5 100644
--- a/kotlin-native/backend.native/tests/runtime/workers/worker_exception_messages.kt
+++ b/kotlin-native/backend.native/tests/runtime/workers/worker_exception_messages.kt
@@ -1,4 +1,4 @@
-@file:OptIn(FreezingIsDeprecated::class, ObsoleteWorkersApi::class)
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class, FreezingIsDeprecated::class, ObsoleteWorkersApi::class)
 package runtime.workers.worker_exception_messages
 
 import kotlin.test.*
diff --git a/kotlin-native/backend.native/tests/runtime/workers/worker_threadlocal_no_leak.kt b/kotlin-native/backend.native/tests/runtime/workers/worker_threadlocal_no_leak.kt
index 9a3f32979f9..0d03366c333 100644
--- a/kotlin-native/backend.native/tests/runtime/workers/worker_threadlocal_no_leak.kt
+++ b/kotlin-native/backend.native/tests/runtime/workers/worker_threadlocal_no_leak.kt
@@ -3,7 +3,7 @@
  * that can be found in the LICENSE file.
  */
 
-@file:OptIn(ObsoleteWorkersApi::class)
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class, ObsoleteWorkersApi::class)
 import kotlin.native.concurrent.*
 import kotlin.native.Platform
 
diff --git a/kotlin-native/backend.native/tests/sanity/assertions_enabled_for_local_tests.kt b/kotlin-native/backend.native/tests/sanity/assertions_enabled_for_local_tests.kt
index 12620a5fc42..6b1a6e36928 100644
--- a/kotlin-native/backend.native/tests/sanity/assertions_enabled_for_local_tests.kt
+++ b/kotlin-native/backend.native/tests/sanity/assertions_enabled_for_local_tests.kt
@@ -1,3 +1,4 @@
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class)
 package sanity.assertions_enabled
 
 import kotlin.test.Test
diff --git a/kotlin-native/backend.native/tests/testing/custom_main.kt b/kotlin-native/backend.native/tests/testing/custom_main.kt
index 50a52b21be6..51bb516689d 100644
--- a/kotlin-native/backend.native/tests/testing/custom_main.kt
+++ b/kotlin-native/backend.native/tests/testing/custom_main.kt
@@ -2,7 +2,7 @@
  * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
  * that can be found in the LICENSE file.
  */
-
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class)
 package kotlin.test.tests
 
 import kotlin.test.*
diff --git a/kotlin-native/backend.native/tests/testing/library_user.kt b/kotlin-native/backend.native/tests/testing/library_user.kt
index ab5de47a748..0ceccebebe8 100644
--- a/kotlin-native/backend.native/tests/testing/library_user.kt
+++ b/kotlin-native/backend.native/tests/testing/library_user.kt
@@ -1,3 +1,5 @@
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class)
+
 import kotlin.native.internal.test.*
 import kotlin.test.*
 import library.*
diff --git a/libraries/stdlib/native-wasm/test/harmony_regex/AllCodePointsTest.kt b/libraries/stdlib/native-wasm/test/harmony_regex/AllCodePointsTest.kt
index 451fbfc2d1a..79958334b84 100644
--- a/libraries/stdlib/native-wasm/test/harmony_regex/AllCodePointsTest.kt
+++ b/libraries/stdlib/native-wasm/test/harmony_regex/AllCodePointsTest.kt
@@ -25,6 +25,7 @@ class AllCodePointsTest {
     fun assertTrue(msg: String, value: Boolean) = assertTrue(value, msg)
     fun assertFalse(msg: String, value: Boolean) = assertFalse(value, msg)
 
+    @OptIn(kotlin.experimental.ExperimentalNativeApi::class)
     fun codePointToString(codePoint: Int): String {
         val charArray = Char.toChars(codePoint)
         return charArray.concatToString(0, charArray.size)