diff --git a/compiler/frontend/src/org/jetbrains/jet/lang/resolve/AbstractScopeAdapter.java b/compiler/frontend/src/org/jetbrains/jet/lang/resolve/AbstractScopeAdapter.java
index 7e0265b151d..7078bb0ee12 100644
--- a/compiler/frontend/src/org/jetbrains/jet/lang/resolve/AbstractScopeAdapter.java
+++ b/compiler/frontend/src/org/jetbrains/jet/lang/resolve/AbstractScopeAdapter.java
@@ -22,7 +22,6 @@ import org.jetbrains.jet.lang.resolve.name.LabelName;
 import org.jetbrains.jet.lang.resolve.name.Name;
 import org.jetbrains.jet.lang.resolve.scopes.DescriptorPredicate;
 import org.jetbrains.jet.lang.resolve.scopes.JetScope;
-import org.jetbrains.jet.lang.resolve.scopes.JetScopeBase;
 import org.jetbrains.jet.lang.resolve.scopes.receivers.ReceiverDescriptor;
 
 import java.util.Collection;
@@ -34,7 +33,7 @@ import java.util.Set;
  *
  * @author abreslav
  */
-public abstract class AbstractScopeAdapter extends JetScopeBase {
+public abstract class AbstractScopeAdapter implements JetScope {
     @NotNull
     protected abstract JetScope getWorkerScope();
 
@@ -110,4 +109,8 @@ public abstract class AbstractScopeAdapter extends JetScopeBase {
         return getWorkerScope().getAllDescriptors(predicate);
     }
 
+    @Override
+    public Collection<DeclarationDescriptor> getAllDescriptors() {
+        return getAllDescriptors(DescriptorPredicate.all());
+    }
 }
diff --git a/compiler/frontend/src/org/jetbrains/jet/lang/resolve/lazy/AbstractLazyMemberScope.java b/compiler/frontend/src/org/jetbrains/jet/lang/resolve/lazy/AbstractLazyMemberScope.java
index 1970199396c..e4c68cb68fe 100644
--- a/compiler/frontend/src/org/jetbrains/jet/lang/resolve/lazy/AbstractLazyMemberScope.java
+++ b/compiler/frontend/src/org/jetbrains/jet/lang/resolve/lazy/AbstractLazyMemberScope.java
@@ -29,7 +29,6 @@ import org.jetbrains.jet.lang.resolve.name.Name;
 import org.jetbrains.jet.lang.resolve.scopes.DescriptorPredicate;
 import org.jetbrains.jet.lang.resolve.scopes.DescriptorPredicateUtils;
 import org.jetbrains.jet.lang.resolve.scopes.JetScope;
-import org.jetbrains.jet.lang.resolve.scopes.JetScopeBase;
 import org.jetbrains.jet.lang.resolve.scopes.receivers.ReceiverDescriptor;
 
 import java.util.*;
@@ -37,7 +36,7 @@ import java.util.*;
 /**
  * @author abreslav
  */
-public abstract class AbstractLazyMemberScope<D extends DeclarationDescriptor, DP extends DeclarationProvider> extends JetScopeBase {
+public abstract class AbstractLazyMemberScope<D extends DeclarationDescriptor, DP extends DeclarationProvider> implements JetScope {
     protected final ResolveSession resolveSession;
     protected final DP declarationProvider;
     protected final D thisDescriptor;
@@ -232,6 +231,11 @@ public abstract class AbstractLazyMemberScope<D extends DeclarationDescriptor, D
         return DescriptorPredicateUtils.filter(allDescriptors, predicate);
     }
 
+    @Override
+    public Collection<DeclarationDescriptor> getAllDescriptors() {
+        return getAllDescriptors(DescriptorPredicate.all());
+    }
+
     protected abstract void addExtraDescriptors();
 
     @Override
diff --git a/compiler/frontend/src/org/jetbrains/jet/lang/resolve/scopes/ChainedScope.java b/compiler/frontend/src/org/jetbrains/jet/lang/resolve/scopes/ChainedScope.java
index 255e7c6232f..ed67b75dfe1 100644
--- a/compiler/frontend/src/org/jetbrains/jet/lang/resolve/scopes/ChainedScope.java
+++ b/compiler/frontend/src/org/jetbrains/jet/lang/resolve/scopes/ChainedScope.java
@@ -31,7 +31,7 @@ import java.util.Set;
 /**
  * @author abreslav
  */
-public class ChainedScope extends JetScopeBase {
+public class ChainedScope implements JetScope {
     private final DeclarationDescriptor containingDeclaration;
     private final JetScope[] scopeChain;
     private Collection<DeclarationDescriptor> allDescriptors;
@@ -167,4 +167,8 @@ public class ChainedScope extends JetScopeBase {
         return allDescriptors;
     }
 
+    @Override
+    public Collection<DeclarationDescriptor> getAllDescriptors() {
+        return getAllDescriptors(DescriptorPredicate.all());
+    }
 }
diff --git a/compiler/frontend/src/org/jetbrains/jet/lang/resolve/scopes/JetScopeBase.java b/compiler/frontend/src/org/jetbrains/jet/lang/resolve/scopes/JetScopeBase.java
deleted file mode 100644
index 42130096fc9..00000000000
--- a/compiler/frontend/src/org/jetbrains/jet/lang/resolve/scopes/JetScopeBase.java
+++ /dev/null
@@ -1,33 +0,0 @@
-/*
- * Copyright 2010-2012 JetBrains s.r.o.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.jetbrains.jet.lang.resolve.scopes;
-
-import org.jetbrains.jet.lang.descriptors.DeclarationDescriptor;
-
-import java.util.Collection;
-
-/**
- * @author Stepan Koltsov
- */
-public abstract class JetScopeBase implements JetScope {
-
-    @Override
-    public Collection<DeclarationDescriptor> getAllDescriptors() {
-        return getAllDescriptors(DescriptorPredicate.all());
-    }
-
-}
diff --git a/compiler/frontend/src/org/jetbrains/jet/lang/resolve/scopes/JetScopeImpl.java b/compiler/frontend/src/org/jetbrains/jet/lang/resolve/scopes/JetScopeImpl.java
index 8b726c692a5..8cca81cb214 100644
--- a/compiler/frontend/src/org/jetbrains/jet/lang/resolve/scopes/JetScopeImpl.java
+++ b/compiler/frontend/src/org/jetbrains/jet/lang/resolve/scopes/JetScopeImpl.java
@@ -30,7 +30,7 @@ import java.util.Set;
 /**
 * @author abreslav
 */
-public abstract class JetScopeImpl extends JetScopeBase {
+public abstract class JetScopeImpl implements JetScope {
     @Override
     public ClassifierDescriptor getClassifier(@NotNull Name name) {
         return null;
@@ -92,6 +92,11 @@ public abstract class JetScopeImpl extends JetScopeBase {
         return Collections.emptyList();
     }
 
+    @Override
+    public Collection<DeclarationDescriptor> getAllDescriptors() {
+        return getAllDescriptors(DescriptorPredicate.all());
+    }
+
     @Override
     public void getImplicitReceiversHierarchy(@NotNull List<ReceiverDescriptor> result) {
     }
diff --git a/compiler/frontend/src/org/jetbrains/jet/lang/resolve/scopes/SubstitutingScope.java b/compiler/frontend/src/org/jetbrains/jet/lang/resolve/scopes/SubstitutingScope.java
index 72c8280aa4d..bb7ab7294eb 100644
--- a/compiler/frontend/src/org/jetbrains/jet/lang/resolve/scopes/SubstitutingScope.java
+++ b/compiler/frontend/src/org/jetbrains/jet/lang/resolve/scopes/SubstitutingScope.java
@@ -34,7 +34,7 @@ import java.util.Set;
 /**
  * @author abreslav
  */
-public class SubstitutingScope extends JetScopeBase {
+public class SubstitutingScope implements JetScope {
 
     private final JetScope workerScope;
     private final TypeSubstitutor substitutor;
@@ -163,4 +163,8 @@ public class SubstitutingScope extends JetScopeBase {
         return allDescriptors;
     }
 
+    @Override
+    public Collection<DeclarationDescriptor> getAllDescriptors() {
+        return getAllDescriptors(DescriptorPredicate.all());
+    }
 }
diff --git a/compiler/frontend/src/org/jetbrains/jet/lang/types/ErrorUtils.java b/compiler/frontend/src/org/jetbrains/jet/lang/types/ErrorUtils.java
index 4a986f1ad67..5e6a2e3598a 100644
--- a/compiler/frontend/src/org/jetbrains/jet/lang/types/ErrorUtils.java
+++ b/compiler/frontend/src/org/jetbrains/jet/lang/types/ErrorUtils.java
@@ -24,7 +24,6 @@ import org.jetbrains.jet.lang.resolve.name.LabelName;
 import org.jetbrains.jet.lang.resolve.name.Name;
 import org.jetbrains.jet.lang.resolve.scopes.DescriptorPredicate;
 import org.jetbrains.jet.lang.resolve.scopes.JetScope;
-import org.jetbrains.jet.lang.resolve.scopes.JetScopeBase;
 import org.jetbrains.jet.lang.resolve.scopes.receivers.ReceiverDescriptor;
 import org.jetbrains.jet.lang.types.error.ErrorSimpleFunctionDescriptorImpl;
 import org.jetbrains.jet.lang.types.lang.JetStandardClasses;
@@ -39,7 +38,7 @@ public class ErrorUtils {
     private static final ModuleDescriptor ERROR_MODULE = new ModuleDescriptor(Name.special("<ERROR MODULE>"));
 
 
-    public static class ErrorScope extends JetScopeBase {
+    public static class ErrorScope implements JetScope {
 
         private final String debugMessage;
 
@@ -118,6 +117,10 @@ public class ErrorUtils {
             return Collections.emptyList();
         }
 
+        @Override
+        public Collection<DeclarationDescriptor> getAllDescriptors() {
+            return getAllDescriptors(DescriptorPredicate.all());
+        }
     }
 
     private static final ClassDescriptorImpl ERROR_CLASS = new ClassDescriptorImpl(ERROR_MODULE, Collections.<AnnotationDescriptor>emptyList(), Name.special("<ERROR CLASS>")) {