[Commonizer] Fix: Correct resolution of nested classes

konan/commonizer/src/org/jetbrains/kotlin/descriptors/commonizer/builder/utils.kt

@@ -10,6 +10,7 @@ import org.jetbrains.kotlin.descriptors.annotations.Annotations
 import org.jetbrains.kotlin.descriptors.commonizer.isUnderStandardKotlinPackages
 import org.jetbrains.kotlin.descriptors.commonizer.mergedtree.ir.*
 import org.jetbrains.kotlin.descriptors.commonizer.mergedtree.ir.CirSimpleTypeKind.Companion.areCompatible
+import org.jetbrains.kotlin.descriptors.commonizer.resolveClassOrTypeAliasByFqName
 import org.jetbrains.kotlin.descriptors.impl.ValueParameterDescriptorImpl
 import org.jetbrains.kotlin.incremental.components.NoLookupLocation
 import org.jetbrains.kotlin.name.FqName
@@ -18,7 +19,6 @@ import org.jetbrains.kotlin.resolve.DescriptorUtils
 import org.jetbrains.kotlin.types.*
 import org.jetbrains.kotlin.types.KotlinTypeFactory.flexibleType
 import org.jetbrains.kotlin.types.KotlinTypeFactory.simpleType
-import org.jetbrains.kotlin.utils.addToStdlib.cast
 
 internal fun List<CirTypeParameter>.buildDescriptorsAndTypeParameterResolver(
     targetComponents: TargetDeclarationsBuilderComponents,
@@ -142,10 +142,7 @@ internal fun findClassOrTypeAlias(
         val builtInsModule = targetComponents.builtIns.builtInsModule
 
         // TODO: this works fine for Native as far as built-ins module contains full Native stdlib, but this is not enough for JVM and JS
-        builtInsModule.getPackage(fqName.parent())
-            .memberScope
-            .getContributedClassifier(fqName.shortName(), NoLookupLocation.FOR_ALREADY_TRACKED)
-            ?.cast()
+        builtInsModule.resolveClassOrTypeAliasByFqName(fqName, NoLookupLocation.FOR_ALREADY_TRACKED)
             ?: error("Classifier $fqName not found in built-ins module $builtInsModule")
     }
 

konan/commonizer/src/org/jetbrains/kotlin/descriptors/commonizer/utils.kt

@@ -6,9 +6,12 @@
 package org.jetbrains.kotlin.descriptors.commonizer
 
 import org.jetbrains.kotlin.builtins.KotlinBuiltIns
+import org.jetbrains.kotlin.descriptors.ClassDescriptor
 import org.jetbrains.kotlin.descriptors.ClassifierDescriptor
+import org.jetbrains.kotlin.descriptors.ClassifierDescriptorWithTypeParameters
 import org.jetbrains.kotlin.descriptors.ModuleDescriptor
 import org.jetbrains.kotlin.descriptors.impl.ModuleDescriptorImpl
+import org.jetbrains.kotlin.incremental.components.LookupLocation
 import org.jetbrains.kotlin.konan.library.KonanFactories.DefaultDeserializedDescriptorFactory
 import org.jetbrains.kotlin.konan.library.KonanFactories.createDefaultKonanResolvedModuleDescriptorsFactory
 import org.jetbrains.kotlin.name.FqName
@@ -125,3 +128,20 @@ internal fun createKotlinNativeForwardDeclarationsModule(
             builtIns = builtIns,
             storageManager = storageManager
         )
+
+// similar to org.jetbrains.kotlin.descriptors.DescriptorUtilKt#resolveClassByFqName, but resolves also type aliases
+internal fun ModuleDescriptor.resolveClassOrTypeAliasByFqName(
+    fqName: FqName,
+    lookupLocation: LookupLocation
+): ClassifierDescriptorWithTypeParameters? {
+    if (fqName.isRoot) return null
+
+    (getPackage(fqName.parent()).memberScope.getContributedClassifier(
+        fqName.shortName(),
+        lookupLocation
+    ) as? ClassifierDescriptorWithTypeParameters)?.let { return it }
+
+    return (resolveClassOrTypeAliasByFqName(fqName.parent(), lookupLocation) as? ClassDescriptor)
+        ?.unsubstitutedInnerClassesScope
+        ?.getContributedClassifier(fqName.shortName(), lookupLocation) as? ClassifierDescriptorWithTypeParameters
+}