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 7078bb0ee12..7e0265b151d 100644
--- a/compiler/frontend/src/org/jetbrains/jet/lang/resolve/AbstractScopeAdapter.java
+++ b/compiler/frontend/src/org/jetbrains/jet/lang/resolve/AbstractScopeAdapter.java
@@ -22,6 +22,7 @@ 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;
@@ -33,7 +34,7 @@ import java.util.Set;
  *
  * @author abreslav
  */
-public abstract class AbstractScopeAdapter implements JetScope {
+public abstract class AbstractScopeAdapter extends JetScopeBase {
     @NotNull
     protected abstract JetScope getWorkerScope();
 
@@ -109,8 +110,4 @@ public abstract class AbstractScopeAdapter implements JetScope {
         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 e4c68cb68fe..1970199396c 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
@@ -29,6 +29,7 @@ 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.*;
@@ -36,7 +37,7 @@ import java.util.*;
 /**
  * @author abreslav
  */
-public abstract class AbstractLazyMemberScope<D extends DeclarationDescriptor, DP extends DeclarationProvider> implements JetScope {
+public abstract class AbstractLazyMemberScope<D extends DeclarationDescriptor, DP extends DeclarationProvider> extends JetScopeBase {
     protected final ResolveSession resolveSession;
     protected final DP declarationProvider;
     protected final D thisDescriptor;
@@ -231,11 +232,6 @@ 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 ed67b75dfe1..255e7c6232f 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 implements JetScope {
+public class ChainedScope extends JetScopeBase {
     private final DeclarationDescriptor containingDeclaration;
     private final JetScope[] scopeChain;
     private Collection<DeclarationDescriptor> allDescriptors;
@@ -167,8 +167,4 @@ public class ChainedScope implements JetScope {
         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
new file mode 100644
index 00000000000..42130096fc9
--- /dev/null
+++ b/compiler/frontend/src/org/jetbrains/jet/lang/resolve/scopes/JetScopeBase.java
@@ -0,0 +1,33 @@
+/*
+ * 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 8cca81cb214..8b726c692a5 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 implements JetScope {
+public abstract class JetScopeImpl extends JetScopeBase {
     @Override
     public ClassifierDescriptor getClassifier(@NotNull Name name) {
         return null;
@@ -92,11 +92,6 @@ public abstract class JetScopeImpl implements JetScope {
         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 bb7ab7294eb..72c8280aa4d 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 implements JetScope {
+public class SubstitutingScope extends JetScopeBase {
 
     private final JetScope workerScope;
     private final TypeSubstitutor substitutor;
@@ -163,8 +163,4 @@ public class SubstitutingScope implements JetScope {
         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 5e6a2e3598a..4a986f1ad67 100644
--- a/compiler/frontend/src/org/jetbrains/jet/lang/types/ErrorUtils.java
+++ b/compiler/frontend/src/org/jetbrains/jet/lang/types/ErrorUtils.java
@@ -24,6 +24,7 @@ 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;
@@ -38,7 +39,7 @@ public class ErrorUtils {
     private static final ModuleDescriptor ERROR_MODULE = new ModuleDescriptor(Name.special("<ERROR MODULE>"));
 
 
-    public static class ErrorScope implements JetScope {
+    public static class ErrorScope extends JetScopeBase {
 
         private final String debugMessage;
 
@@ -117,10 +118,6 @@ 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>")) {