diff --git a/compiler/frontend/src/org/jetbrains/jet/lang/resolve/lazy/LazyClassDescriptor.java b/compiler/frontend/src/org/jetbrains/jet/lang/resolve/lazy/LazyClassDescriptor.java
index 32f4bb0e931..1ba80c895f1 100644
--- a/compiler/frontend/src/org/jetbrains/jet/lang/resolve/lazy/LazyClassDescriptor.java
+++ b/compiler/frontend/src/org/jetbrains/jet/lang/resolve/lazy/LazyClassDescriptor.java
@@ -135,7 +135,10 @@ public class LazyClassDescriptor extends ClassDescriptorBase implements LazyDesc
             scope.changeLockLevel(WritableScope.LockLevel.READING);
 
             PsiElement scopeAnchor = declarationProvider.getOwnerInfo().getScopeAnchor();
-            scopeForClassHeaderResolution = new ChainedScope(this, scope, getScopeProvider().getResolutionScopeForDeclaration(scopeAnchor));
+            scopeForClassHeaderResolution = new ChainedScope(
+                    this,
+                    "ScopeForClassHeaderResolution: " + getName(),
+                    scope, getScopeProvider().getResolutionScopeForDeclaration(scopeAnchor));
         }
         return scopeForClassHeaderResolution;
     }
@@ -147,7 +150,10 @@ public class LazyClassDescriptor extends ClassDescriptorBase implements LazyDesc
             scope.addLabeledDeclaration(this);
             scope.changeLockLevel(WritableScope.LockLevel.READING);
 
-            scopeForMemberDeclarationResolution = new ChainedScope(this, scope, getScopeForMemberLookup(), getScopeForClassHeaderResolution());
+            scopeForMemberDeclarationResolution = new ChainedScope(
+                    this,
+                    "ScopeForMemberDeclarationResolution: " + getName(),
+                    scope, getScopeForMemberLookup(), getScopeForClassHeaderResolution());
         }
         return scopeForMemberDeclarationResolution;
     }
@@ -167,7 +173,10 @@ public class LazyClassDescriptor extends ClassDescriptorBase implements LazyDesc
 
             scope.changeLockLevel(WritableScope.LockLevel.READING);
 
-            scopeForPropertyInitializerResolution = new ChainedScope(this, scope, getScopeForMemberDeclarationResolution());
+            scopeForPropertyInitializerResolution = new ChainedScope(
+                    this,
+                    "ScopeForPropertyInitializerResolution: " + getName(),
+                    scope, getScopeForMemberDeclarationResolution());
         }
         return scopeForPropertyInitializerResolution;
     }
diff --git a/compiler/frontend/src/org/jetbrains/jet/lang/resolve/lazy/LazyPackageDescriptor.java b/compiler/frontend/src/org/jetbrains/jet/lang/resolve/lazy/LazyPackageDescriptor.java
index b83184086a0..6dbfc039ab9 100644
--- a/compiler/frontend/src/org/jetbrains/jet/lang/resolve/lazy/LazyPackageDescriptor.java
+++ b/compiler/frontend/src/org/jetbrains/jet/lang/resolve/lazy/LazyPackageDescriptor.java
@@ -46,7 +46,7 @@ public class LazyPackageDescriptor extends AbstractNamespaceDescriptorImpl imple
 
         this.lazyScope = new LazyPackageMemberScope(resolveSession, declarationProvider, this);
 
-        this.memberScope = new ChainedScope(this, lazyScope, scope);
+        this.memberScope = new ChainedScope(this, "Lazy package members scope: " + name, lazyScope, scope);
     }
 
     @NotNull
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 f0615d2dcb5..5a0b8322bf7 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
@@ -30,13 +30,20 @@ import java.util.Set;
 
 public class ChainedScope implements JetScope {
     private final DeclarationDescriptor containingDeclaration;
+    private final String debugName;
     private final JetScope[] scopeChain;
     private Collection<DeclarationDescriptor> allDescriptors;
     private List<ReceiverParameterDescriptor> implicitReceiverHierarchy;
 
     public ChainedScope(DeclarationDescriptor containingDeclaration, JetScope... scopes) {
+        this(containingDeclaration, "Untitled chained scope", scopes);
+    }
+
+    public ChainedScope(DeclarationDescriptor containingDeclaration, String debugName, JetScope... scopes) {
         this.containingDeclaration = containingDeclaration;
         scopeChain = scopes.clone();
+
+        this.debugName = debugName;
     }
 
     @Override
@@ -133,7 +140,7 @@ public class ChainedScope implements JetScope {
 
     @NotNull
     @Override
-    public Collection<DeclarationDescriptor> getDeclarationsByLabel(LabelName labelName) {
+    public Collection<DeclarationDescriptor> getDeclarationsByLabel(@NotNull LabelName labelName) {
         for (JetScope jetScope : scopeChain) {
             Collection<DeclarationDescriptor> declarationsByLabel = jetScope.getDeclarationsByLabel(labelName);
             if (!declarationsByLabel.isEmpty()) return declarationsByLabel; // TODO : merge?
@@ -169,4 +176,9 @@ public class ChainedScope implements JetScope {
     public Collection<DeclarationDescriptor> getOwnDeclaredDescriptors() {
         throw new UnsupportedOperationException();
     }
+
+    @Override
+    public String toString() {
+        return debugName;
+    }
 }