Light Classes: Do not add "final" modifier to enum light classes

compiler/backend/src/org/jetbrains/jet/codegen/ImplementationBodyCodegen.java

@@ -142,7 +142,8 @@ public class ImplementationBodyCodegen extends ClassBodyCodegen {
             }
 
             if (!jetClass.hasModifier(JetTokens.OPEN_KEYWORD) && !isAbstract) {
-                isFinal = true;
+                // Light-class mode: Do not make enum classes final since PsiClass corresponding to enum is expected to be inheritable from
+                isFinal = !(jetClass.isEnum() && state.getClassBuilderMode() == ClassBuilderMode.LIGHT_CLASSES);
             }
             isStatic = !jetClass.isInner();
         }

compiler/jet.as.java.psi/src/org/jetbrains/jet/asJava/KotlinLightClassForExplicitDeclaration.java

@@ -431,7 +431,7 @@ public class KotlinLightClassForExplicitDeclaration extends KotlinWrappingLightC
         if (isAbstract(classOrObject)) {
             psiModifiers.add(PsiModifier.ABSTRACT);
         }
-        else if (!classOrObject.hasModifier(OPEN_KEYWORD)) {
+        else if (!(classOrObject.hasModifier(OPEN_KEYWORD) || (classOrObject instanceof JetClass && ((JetClass) classOrObject).isEnum()))) {
             psiModifiers.add(PsiModifier.FINAL);
         }
 

compiler/tests/org/jetbrains/jet/asJava/KotlinLightClassStructureTest.java

@@ -76,7 +76,7 @@ public abstract class KotlinLightClassStructureTest extends KotlinAsJavaTestBase
         }
 
         public void testEnum() {
-            checkModifiers("test.Enum", PUBLIC, FINAL, ENUM);
+            checkModifiers("test.Enum", PUBLIC, ENUM);
         }
 
         public void testTrait() {