JS backend: Fix override val property in ecma5.

js/js.tests/test/org/jetbrains/k2js/test/semantics/ClassInheritanceTest.java

@@ -32,6 +32,10 @@ public final class ClassInheritanceTest extends SingleFileTranslationTest {
         fooBoxTest();
     }
 
+    public void testValOverride() throws Exception {
+        fooBoxTest();
+    }
+
     public void testInitializationOrder() throws Exception {
         fooBoxTest();
     }

js/js.translator/src/org/jetbrains/k2js/translate/utils/JsAstUtils.java

@@ -22,6 +22,7 @@ import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 import org.jetbrains.jet.lang.descriptors.DeclarationDescriptor;
 import org.jetbrains.jet.lang.descriptors.FunctionDescriptor;
+import org.jetbrains.jet.lang.descriptors.Modality;
 import org.jetbrains.jet.lang.descriptors.PropertyDescriptor;
 import org.jetbrains.k2js.translate.context.TranslationContext;
 
@@ -261,7 +262,7 @@ public final class JsAstUtils {
     @NotNull
     public static JsObjectLiteral createPropertyDataDescriptor(@NotNull PropertyDescriptor descriptor,
             @NotNull JsExpression value) {
-        return createPropertyDataDescriptor(descriptor.isVar(), descriptor, value);
+        return createPropertyDataDescriptor(descriptor.isVar() || descriptor.getModality() == Modality.OPEN, descriptor, value);
     }
 
     @NotNull

js/js.translator/testFiles/inheritance/cases/valOverride.kt

@@ -0,0 +1,15 @@
+package foo
+
+open class C() {
+    open val a = 1
+}
+
+class D() : C() {
+    override val a = 2
+}
+
+fun box(): Boolean {
+    val d : C = D()
+    if(d.a != 2) return false
+    return true
+}