diff --git a/compiler/frontend/src/org/jetbrains/jet/lang/resolve/BindingContext.java b/compiler/frontend/src/org/jetbrains/jet/lang/resolve/BindingContext.java
index a82dcc47615..4d2d57f4017 100644
--- a/compiler/frontend/src/org/jetbrains/jet/lang/resolve/BindingContext.java
+++ b/compiler/frontend/src/org/jetbrains/jet/lang/resolve/BindingContext.java
@@ -16,9 +16,11 @@
 
 package org.jetbrains.jet.lang.resolve;
 
+import com.google.common.collect.ImmutableMap;
 import com.intellij.psi.PsiElement;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
+import org.jetbrains.annotations.TestOnly;
 import org.jetbrains.jet.lang.descriptors.*;
 import org.jetbrains.jet.lang.descriptors.annotations.AnnotationDescriptor;
 import org.jetbrains.jet.lang.diagnostics.Diagnostic;
@@ -59,6 +61,13 @@ public interface BindingContext {
         public <K, V> Collection<K> getKeys(WritableSlice<K, V> slice) {
             return Collections.emptyList();
         }
+
+        @NotNull
+        @TestOnly
+        @Override
+        public <K, V> ImmutableMap<K, V> getSliceContents(@NotNull ReadOnlySlice<K, V> slice) {
+            return ImmutableMap.of();
+        }
     };
 
     WritableSlice<AnnotationDescriptor, JetAnnotationEntry> ANNOTATION_DESCRIPTOR_TO_PSI_ELEMENT = Slices.createSimpleSlice();
@@ -253,4 +262,9 @@ public interface BindingContext {
     // slice.isCollective() must be true
     @NotNull
     <K, V> Collection<K> getKeys(WritableSlice<K, V> slice);
+
+    /** This method should be used only for debug and testing */
+    @TestOnly
+    @NotNull
+    <K, V> ImmutableMap<K, V> getSliceContents(@NotNull ReadOnlySlice<K, V> slice);
 }
diff --git a/compiler/frontend/src/org/jetbrains/jet/lang/resolve/BindingTraceContext.java b/compiler/frontend/src/org/jetbrains/jet/lang/resolve/BindingTraceContext.java
index 3eddd9bf206..e22ae473589 100644
--- a/compiler/frontend/src/org/jetbrains/jet/lang/resolve/BindingTraceContext.java
+++ b/compiler/frontend/src/org/jetbrains/jet/lang/resolve/BindingTraceContext.java
@@ -16,8 +16,10 @@
 
 package org.jetbrains.jet.lang.resolve;
 
+import com.google.common.collect.ImmutableMap;
 import com.google.common.collect.Lists;
 import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.TestOnly;
 import org.jetbrains.jet.lang.diagnostics.Diagnostic;
 import org.jetbrains.jet.util.slicedmap.MutableSlicedMap;
 import org.jetbrains.jet.util.slicedmap.ReadOnlySlice;
@@ -52,6 +54,13 @@ public class BindingTraceContext implements BindingTrace {
         public <K, V> Collection<K> getKeys(WritableSlice<K, V> slice) {
             return BindingTraceContext.this.getKeys(slice);
         }
+
+        @NotNull
+        @TestOnly
+        @Override
+        public <K, V> ImmutableMap<K, V> getSliceContents(@NotNull ReadOnlySlice<K, V> slice) {
+            return map.getSliceContents(slice);
+        }
     };
 
     @Override
diff --git a/compiler/frontend/src/org/jetbrains/jet/lang/resolve/DelegatingBindingTrace.java b/compiler/frontend/src/org/jetbrains/jet/lang/resolve/DelegatingBindingTrace.java
index a31a5581000..110abc5c45e 100644
--- a/compiler/frontend/src/org/jetbrains/jet/lang/resolve/DelegatingBindingTrace.java
+++ b/compiler/frontend/src/org/jetbrains/jet/lang/resolve/DelegatingBindingTrace.java
@@ -16,10 +16,11 @@
 
 package org.jetbrains.jet.lang.resolve;
 
-import com.google.common.base.Predicate;
+import com.google.common.collect.ImmutableMap;
 import com.google.common.collect.Lists;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
+import org.jetbrains.annotations.TestOnly;
 import org.jetbrains.jet.lang.diagnostics.Diagnostic;
 import org.jetbrains.jet.util.slicedmap.*;
 
@@ -55,6 +56,15 @@ public class DelegatingBindingTrace implements BindingTrace {
             return DelegatingBindingTrace.this.getKeys(slice);
 
         }
+
+        @NotNull
+        @TestOnly
+        @Override
+        public <K, V> ImmutableMap<K, V> getSliceContents(@NotNull ReadOnlySlice<K, V> slice) {
+            ImmutableMap<K, V> parentContents = parentContext.getSliceContents(slice);
+            ImmutableMap<K, V> currentContents = map.getSliceContents(slice);
+            return ImmutableMap.<K, V>builder().putAll(parentContents).putAll(currentContents).build();
+        }
     };
 
     public DelegatingBindingTrace(BindingContext parentContext) {
diff --git a/compiler/tests/org/jetbrains/jet/JetTestUtils.java b/compiler/tests/org/jetbrains/jet/JetTestUtils.java
index 6a9f2c3c717..1e1ce1b16cc 100644
--- a/compiler/tests/org/jetbrains/jet/JetTestUtils.java
+++ b/compiler/tests/org/jetbrains/jet/JetTestUtils.java
@@ -16,6 +16,7 @@
 
 package org.jetbrains.jet;
 
+import com.google.common.collect.ImmutableMap;
 import com.google.common.collect.Lists;
 import com.google.common.collect.Sets;
 import com.intellij.openapi.Disposable;
@@ -30,6 +31,7 @@ import com.intellij.testFramework.LightVirtualFile;
 import junit.framework.TestCase;
 import org.jetbrains.annotations.NonNls;
 import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.TestOnly;
 import org.jetbrains.jet.analyzer.AnalyzeExhaust;
 import org.jetbrains.jet.cli.jvm.compiler.JetCoreEnvironment;
 import org.jetbrains.jet.lang.BuiltinsScopeExtensionMode;
@@ -87,6 +89,13 @@ public class JetTestUtils {
                 public <K, V> Collection<K> getKeys(WritableSlice<K, V> slice) {
                     return DUMMY_TRACE.getKeys(slice);
                 }
+
+                @NotNull
+                @TestOnly
+                @Override
+                public <K, V> ImmutableMap<K, V> getSliceContents(@NotNull ReadOnlySlice<K, V> slice) {
+                    return ImmutableMap.of();
+                }
             };
         }
 
@@ -138,6 +147,13 @@ public class JetTestUtils {
                 public <K, V> Collection<K> getKeys(WritableSlice<K, V> slice) {
                     return DUMMY_EXCEPTION_ON_ERROR_TRACE.getKeys(slice);
                 }
+
+                @NotNull
+                @TestOnly
+                @Override
+                public <K, V> ImmutableMap<K, V> getSliceContents(@NotNull ReadOnlySlice<K, V> slice) {
+                    return ImmutableMap.of();
+                }
             };
         }