Missing test added

compiler/frontend/src/org/jetbrains/kotlin/resolve/DescriptorResolver.java

@@ -462,7 +462,7 @@ public class DescriptorResolver {
                 parameterDescriptors,
                 returnType,
                 Modality.FINAL,
-                Visibilities.PUBLIC // TODO: test
+                Visibilities.PUBLIC
         );
 
         trace.record(BindingContext.DATA_CLASS_COPY_FUNCTION, classDescriptor, functionDescriptor);

compiler/testData/diagnostics/tests/dataClasses/copyOfPrivateClass.kt

@@ -0,0 +1,3 @@
+class Outer {
+    private data class Nested(val c: Int)
+}

compiler/testData/diagnostics/tests/dataClasses/copyOfPrivateClass.txt

@@ -0,0 +1,18 @@
+package
+
+internal final class Outer {
+    public constructor Outer()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+
+    kotlin.data() private final class Nested {
+        public constructor Nested(/*0*/ c: kotlin.Int)
+        internal final val c: kotlin.Int
+        internal final /*synthesized*/ fun component1(): kotlin.Int
+        public final /*synthesized*/ fun copy(/*0*/ c: kotlin.Int = ...): Outer.Nested
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+}

compiler/tests/org/jetbrains/kotlin/checkers/JetDiagnosticsTestGenerated.java

@@ -2282,6 +2282,12 @@ public class JetDiagnosticsTestGenerated extends AbstractJetDiagnosticsTest {
                 doTest(fileName);
             }
 
+            @TestMetadata("copyOfPrivateClass.kt")
+            public void testCopyOfPrivateClass() throws Exception {
+                String fileName = JetTestUtils.navigationMetadata("compiler/testData/diagnostics/tests/dataClasses/copyOfPrivateClass.kt");
+                doTest(fileName);
+            }
+
             @TestMetadata("dataClassOverrideConflict.kt")
             public void testDataClassOverrideConflict() throws Exception {
                 String fileName = JetTestUtils.navigationMetadata("compiler/testData/diagnostics/tests/dataClasses/dataClassOverrideConflict.kt");