Fix protected visibility in class object.

compiler/testData/diagnostics/tests/scopes/VisibilityInClassObject.kt

@@ -0,0 +1,33 @@
+fun devNull(<!UNUSED_PARAMETER!>obj<!>: Any?) {}
+
+open class A {
+    class object {
+        val internal_val = 1
+        public val public_val: Int = 2
+        private val private_val = 3
+        protected val protected_val: Int = 5
+    }
+
+    fun fromClass() {
+        devNull(internal_val)
+        devNull(public_val)
+        devNull(private_val)
+        devNull(protected_val)
+    }
+}
+
+fun fromOutside() {
+    devNull(A.internal_val)
+    devNull(A.public_val)
+    devNull(A.<!INVISIBLE_MEMBER!>private_val<!>)
+    devNull(A.<!INVISIBLE_MEMBER!>protected_val<!>)
+}
+
+class B: A() {
+    fun fromSubclass() {
+        devNull(A.internal_val)
+        devNull(A.public_val)
+        devNull(A.<!INVISIBLE_MEMBER!>private_val<!>)
+        devNull(A.protected_val)
+    }
+}

compiler/testData/diagnostics/tests/scopes/VisibilityInClassObject.txt

@@ -0,0 +1,32 @@
+package
+
+internal fun devNull(/*0*/ obj: kotlin.Any?): kotlin.Unit
+internal fun fromOutside(): kotlin.Unit
+
+internal open class A {
+    public constructor A()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    internal final fun fromClass(): kotlin.Unit
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+
+    internal class object <class-object-for-A> {
+        private constructor <class-object-for-A>()
+        internal final val internal_val: kotlin.Int = 1
+        private final val private_val: kotlin.Int = 3
+        protected final val protected_val: kotlin.Int = 5
+        public final val public_val: kotlin.Int = 2
+        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
+    }
+}
+
+internal final class B : A {
+    public constructor B()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    internal final override /*1*/ /*fake_override*/ fun fromClass(): kotlin.Unit
+    internal final fun fromSubclass(): kotlin.Unit
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}

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

@@ -9396,6 +9396,12 @@ public class JetDiagnosticsTestGenerated extends AbstractJetDiagnosticsTest {
                 doTest(fileName);
             }
 
+            @TestMetadata("VisibilityInClassObject.kt")
+            public void testVisibilityInClassObject() throws Exception {
+                String fileName = JetTestUtils.navigationMetadata("compiler/testData/diagnostics/tests/scopes/VisibilityInClassObject.kt");
+                doTest(fileName);
+            }
+
             @TestMetadata("VisibilityInheritModifier.kt")
             public void testVisibilityInheritModifier() throws Exception {
                 String fileName = JetTestUtils.navigationMetadata("compiler/testData/diagnostics/tests/scopes/VisibilityInheritModifier.kt");

core/descriptors/src/org/jetbrains/jet/lang/descriptors/Visibilities.java

@@ -63,6 +63,9 @@ public class Visibilities {
         @Override
         protected boolean isVisible(@NotNull DeclarationDescriptorWithVisibility what, @NotNull DeclarationDescriptor from) {
             ClassDescriptor classDescriptor = DescriptorUtils.getParentOfType(what, ClassDescriptor.class);
+            if (DescriptorUtils.isClassObject(classDescriptor)) {
+                classDescriptor = DescriptorUtils.getParentOfType(classDescriptor, ClassDescriptor.class);
+            }
             if (classDescriptor == null) return false;
 
             ClassDescriptor fromClass = DescriptorUtils.getParentOfType(from, ClassDescriptor.class, false);