Inner type aliases.

Type alias is considered "inner" if it captures outer class type parameters (implicitly or explicitly).

core/deserialization/src/org/jetbrains/kotlin/serialization/deserialization/NotFoundClasses.kt

@@ -133,6 +133,8 @@ class NotFoundClasses(private val storageManager: StorageManager, private val mo
             get() = builtIns.nullableAnyType
         override fun getDefaultType(): SimpleType =
                 builtIns.nullableAnyType
+        override val classDescriptor: ClassDescriptor?
+            get() = expandedType.constructor.declarationDescriptor as? ClassDescriptor
 
         override fun substitute(substitutor: TypeSubstitutor) = this
 

core/deserialization/src/org/jetbrains/kotlin/serialization/deserialization/descriptors/DeserializedMemberDescriptor.kt

@@ -169,6 +169,9 @@ class DeserializedTypeAliasDescriptor(
         defaultTypeImpl = computeDefaultType()
     }
 
+    override val classDescriptor: ClassDescriptor?
+        get() = if (expandedType.isError) null else expandedType.constructor.declarationDescriptor as? ClassDescriptor
+
     override fun getDefaultType(): SimpleType =
             defaultTypeImpl