Fix a bug which caused class object's visibility to be ignored

compiler/frontend/src/org/jetbrains/jet/lang/psi/JetDeclarationImpl.java

@@ -17,6 +17,7 @@
 package org.jetbrains.jet.lang.psi;
 
 import com.intellij.lang.ASTNode;
+import com.intellij.psi.PsiElement;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 import org.jetbrains.jet.JetNodeTypes;
@@ -33,9 +34,19 @@ abstract class JetDeclarationImpl extends JetExpressionImpl implements JetDeclar
     @Override
     @Nullable
     public JetModifierList getModifierList() {
+        PsiElement parent = getParent();
+        if (isClassObject(parent)) {
+            assert parent instanceof JetDeclaration;
+            return ((JetDeclaration)parent).getModifierList();
+        }
         return (JetModifierList) findChildByType(JetNodeTypes.MODIFIER_LIST);
     }
 
+
+    private static boolean isClassObject(@NotNull PsiElement parent) {
+        return parent.getNode().getElementType().equals(JetNodeTypes.CLASS_OBJECT);
+    }
+
     @Override
     public boolean hasModifier(JetToken modifier) {
         JetModifierList modifierList = getModifierList();

compiler/testData/diagnostics/tests/ClassObjectVisibility.jet

@@ -0,0 +1,22 @@
+package foo
+
+fun test() {
+  A.d
+  A.<!INVISIBLE_MEMBER!>f<!>
+  B.<!INVISIBLE_MEMBER!>c<!>
+}
+
+class A() {
+  public class object {
+    val d = 3
+    private object f {
+
+    }
+  }
+}
+
+class B() {
+  private class object {
+    val c = 3
+  }
+}