diff --git a/compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/serialization/LegacyDescriptorUtils.kt b/compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/serialization/LegacyDescriptorUtils.kt
index c1d98316aa5..669496c2c22 100644
--- a/compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/serialization/LegacyDescriptorUtils.kt
+++ b/compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/serialization/LegacyDescriptorUtils.kt
@@ -24,10 +24,8 @@ internal val DeclarationDescriptor.isExpectMember: Boolean
 internal val DeclarationDescriptor.isSerializableExpectClass: Boolean
     get() = this is ClassDescriptor && OptionalAnnotationUtil.shouldGenerateExpectClass(this)
 
-tailrec fun DeclarationDescriptor.findPackage(): PackageFragmentDescriptor {
-    return if (this is PackageFragmentDescriptor) this
-    else this.containingDeclaration!!.findPackage()
-}
+@Deprecated("Moved to the ':core:descriptors' module", level = DeprecationLevel.HIDDEN)
+fun DeclarationDescriptor.findPackage(): PackageFragmentDescriptor = findPackage()
 
 private fun sourceByIndex(descriptor: CallableMemberDescriptor, index: Int): SourceFile {
     val fragment = descriptor.findPackage() as KlibMetadataDeserializedPackageFragment
diff --git a/core/descriptors/src/org/jetbrains/kotlin/descriptors/descriptorUtil.kt b/core/descriptors/src/org/jetbrains/kotlin/descriptors/descriptorUtil.kt
index 14aec1cca42..be5ee39fe8e 100644
--- a/core/descriptors/src/org/jetbrains/kotlin/descriptors/descriptorUtil.kt
+++ b/core/descriptors/src/org/jetbrains/kotlin/descriptors/descriptorUtil.kt
@@ -105,4 +105,9 @@ fun FunctionDescriptor.isTypedEqualsInValueClass(): Boolean {
 
 fun FunctionDescriptor.overridesEqualsFromAny(): Boolean = name == OperatorNameConventions.EQUALS
         && valueParameters.size == 1 && valueParameters[0].type.isNullableAny()
-        && contextReceiverParameters.isEmpty() && extensionReceiverParameter == null
\ No newline at end of file
+        && contextReceiverParameters.isEmpty() && extensionReceiverParameter == null
+
+tailrec fun DeclarationDescriptor.findPackage(): PackageFragmentDescriptor {
+    return if (this is PackageFragmentDescriptor) this
+    else this.containingDeclaration!!.findPackage()
+}
\ No newline at end of file
diff --git a/kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/BuiltInFictitiousFunctionIrClassFactory.kt b/kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/BuiltInFictitiousFunctionIrClassFactory.kt
index d6aea64067c..f5ad71a7aad 100644
--- a/kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/BuiltInFictitiousFunctionIrClassFactory.kt
+++ b/kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/BuiltInFictitiousFunctionIrClassFactory.kt
@@ -5,7 +5,6 @@
 
 package org.jetbrains.kotlin.backend.konan
 
-import org.jetbrains.kotlin.backend.konan.descriptors.findPackage
 import org.jetbrains.kotlin.builtins.FunctionInterfacePackageFragment
 import org.jetbrains.kotlin.builtins.functions.FunctionClassDescriptor
 import org.jetbrains.kotlin.builtins.functions.FunctionTypeKind
diff --git a/kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/InlineClasses.kt b/kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/InlineClasses.kt
index 7fcc15ba645..44e9601f43b 100644
--- a/kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/InlineClasses.kt
+++ b/kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/InlineClasses.kt
@@ -6,7 +6,7 @@
 package org.jetbrains.kotlin.backend.konan
 
 import org.jetbrains.kotlin.utils.atMostOne
-import org.jetbrains.kotlin.backend.konan.descriptors.findPackage
+import org.jetbrains.kotlin.descriptors.findPackage
 import org.jetbrains.kotlin.backend.konan.ir.getSuperClassNotAny
 import org.jetbrains.kotlin.builtins.PrimitiveType
 import org.jetbrains.kotlin.descriptors.ClassDescriptor
diff --git a/kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/ObjCInterop.kt b/kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/ObjCInterop.kt
index 18b4a723b84..529f3681354 100644
--- a/kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/ObjCInterop.kt
+++ b/kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/ObjCInterop.kt
@@ -5,7 +5,6 @@
 
 package org.jetbrains.kotlin.backend.konan
 
-import org.jetbrains.kotlin.backend.konan.descriptors.findPackage
 import org.jetbrains.kotlin.backend.konan.descriptors.getAnnotationStringValue
 import org.jetbrains.kotlin.backend.konan.descriptors.getAnnotationValueOrNull
 import org.jetbrains.kotlin.backend.konan.descriptors.getStringValue
diff --git a/kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/descriptors/LegacyDescriptorUtils.kt b/kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/descriptors/LegacyDescriptorUtils.kt
index ffc6ae5e0b6..9cf98083449 100644
--- a/kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/descriptors/LegacyDescriptorUtils.kt
+++ b/kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/descriptors/LegacyDescriptorUtils.kt
@@ -81,11 +81,6 @@ fun ClassDescriptor.isAbstract() = this.modality == Modality.SEALED || this.moda
 internal val FunctionDescriptor.target: FunctionDescriptor
     get() = (if (modality == Modality.ABSTRACT) this else resolveFakeOverride()).original
 
-tailrec internal fun DeclarationDescriptor.findPackage(): PackageFragmentDescriptor {
-    return if (this is PackageFragmentDescriptor) this
-    else this.containingDeclaration!!.findPackage()
-}
-
 internal fun DeclarationDescriptor.findPackageView(): PackageViewDescriptor {
     val packageFragment = this.findPackage()
     return packageFragment.module.getPackage(packageFragment.fqName)
diff --git a/kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/serialization/KonanInteropModuleDeserializer.kt b/kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/serialization/KonanInteropModuleDeserializer.kt
index 3301757ad4f..26719027654 100644
--- a/kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/serialization/KonanInteropModuleDeserializer.kt
+++ b/kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/serialization/KonanInteropModuleDeserializer.kt
@@ -9,12 +9,12 @@ import org.jetbrains.kotlin.backend.common.serialization.DescriptorByIdSignature
 import org.jetbrains.kotlin.backend.common.serialization.IrModuleDeserializer
 import org.jetbrains.kotlin.backend.common.serialization.IrModuleDeserializerKind
 import org.jetbrains.kotlin.backend.common.serialization.encodings.BinarySymbolData
-import org.jetbrains.kotlin.backend.konan.descriptors.findPackage
 import org.jetbrains.kotlin.backend.konan.descriptors.isInteropLibrary
 import org.jetbrains.kotlin.backend.konan.ir.interop.IrProviderForCEnumAndCStructStubs
 import org.jetbrains.kotlin.descriptors.DeclarationDescriptor
 import org.jetbrains.kotlin.descriptors.ModuleDescriptor
 import org.jetbrains.kotlin.descriptors.PackageFragmentDescriptor
+import org.jetbrains.kotlin.descriptors.findPackage
 import org.jetbrains.kotlin.ir.IrBuiltIns
 import org.jetbrains.kotlin.ir.declarations.IrFile
 import org.jetbrains.kotlin.ir.declarations.IrModuleFragment