diff --git a/compiler/frontend/src/org/jetbrains/jet/lang/descriptors/impl/AnonymousFunctionDescriptor.java b/compiler/frontend/src/org/jetbrains/jet/lang/descriptors/impl/AnonymousFunctionDescriptor.java
new file mode 100644
index 00000000000..0ba01680c4f
--- /dev/null
+++ b/compiler/frontend/src/org/jetbrains/jet/lang/descriptors/impl/AnonymousFunctionDescriptor.java
@@ -0,0 +1,34 @@
+/*
+ * Copyright 2010-2013 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.descriptors.impl;
+
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.jet.lang.descriptors.DeclarationDescriptor;
+import org.jetbrains.jet.lang.descriptors.annotations.AnnotationDescriptor;
+import org.jetbrains.jet.lang.resolve.name.Name;
+
+import java.util.List;
+
+public class AnonymousFunctionDescriptor extends SimpleFunctionDescriptorImpl {
+    public AnonymousFunctionDescriptor(
+            @NotNull DeclarationDescriptor containingDeclaration,
+            @NotNull List<AnnotationDescriptor> annotations,
+            @NotNull Kind kind
+    ) {
+        super(containingDeclaration, annotations, Name.special("<anonymous>"), kind);
+    }
+}
diff --git a/compiler/frontend/src/org/jetbrains/jet/lang/resolve/DescriptorUtils.java b/compiler/frontend/src/org/jetbrains/jet/lang/resolve/DescriptorUtils.java
index 33203194794..d50e8702e03 100644
--- a/compiler/frontend/src/org/jetbrains/jet/lang/resolve/DescriptorUtils.java
+++ b/compiler/frontend/src/org/jetbrains/jet/lang/resolve/DescriptorUtils.java
@@ -22,6 +22,7 @@ import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 import org.jetbrains.jet.lang.descriptors.*;
 import org.jetbrains.jet.lang.descriptors.annotations.AnnotationDescriptor;
+import org.jetbrains.jet.lang.descriptors.impl.AnonymousFunctionDescriptor;
 import org.jetbrains.jet.lang.descriptors.impl.NamespaceDescriptorParent;
 import org.jetbrains.jet.lang.psi.JetElement;
 import org.jetbrains.jet.lang.psi.JetFunction;
@@ -264,6 +265,10 @@ public class DescriptorUtils {
         }
     }
 
+    public static boolean isFunctionLiteral(@NotNull FunctionDescriptor descriptor) {
+        return descriptor instanceof AnonymousFunctionDescriptor;
+    }
+
     public static boolean isClassObject(@NotNull DeclarationDescriptor descriptor) {
         return descriptor instanceof ClassDescriptor
                && ((ClassDescriptor) descriptor).getKind() == ClassKind.CLASS_OBJECT;
diff --git a/compiler/frontend/src/org/jetbrains/jet/lang/types/expressions/ClosureExpressionsTypingVisitor.java b/compiler/frontend/src/org/jetbrains/jet/lang/types/expressions/ClosureExpressionsTypingVisitor.java
index c6d17629e2c..052ce5f1aa4 100644
--- a/compiler/frontend/src/org/jetbrains/jet/lang/types/expressions/ClosureExpressionsTypingVisitor.java
+++ b/compiler/frontend/src/org/jetbrains/jet/lang/types/expressions/ClosureExpressionsTypingVisitor.java
@@ -28,7 +28,10 @@ import org.jetbrains.jet.lang.resolve.*;
 import org.jetbrains.jet.lang.resolve.calls.CallResolverUtil;
 import org.jetbrains.jet.lang.resolve.name.Name;
 import org.jetbrains.jet.lang.resolve.scopes.JetScope;
-import org.jetbrains.jet.lang.types.*;
+import org.jetbrains.jet.lang.types.DeferredType;
+import org.jetbrains.jet.lang.types.ErrorUtils;
+import org.jetbrains.jet.lang.types.JetType;
+import org.jetbrains.jet.lang.types.JetTypeInfo;
 import org.jetbrains.jet.lang.types.checker.JetTypeChecker;
 import org.jetbrains.jet.lang.types.lang.KotlinBuiltIns;
 import org.jetbrains.jet.util.lazy.RecursionIntolerantLazyValueWithDefault;
@@ -98,7 +101,7 @@ public class ClosureExpressionsTypingVisitor extends ExpressionTypingVisitor {
         boolean functionTypeExpected = expectedType != NO_EXPECTED_TYPE && KotlinBuiltIns.getInstance().isFunctionOrExtensionFunctionType(
                 expectedType);
 
-        SimpleFunctionDescriptorImpl functionDescriptor = createFunctionDescriptor(expression, context, functionTypeExpected);
+        AnonymousFunctionDescriptor functionDescriptor = createFunctionDescriptor(expression, context, functionTypeExpected);
         JetType safeReturnType = computeReturnType(expression, context, functionDescriptor, functionTypeExpected);
         functionDescriptor.setReturnType(safeReturnType);
 
@@ -114,15 +117,15 @@ public class ClosureExpressionsTypingVisitor extends ExpressionTypingVisitor {
     }
 
     @NotNull
-    private static SimpleFunctionDescriptorImpl createFunctionDescriptor(
+    private static AnonymousFunctionDescriptor createFunctionDescriptor(
             @NotNull JetFunctionLiteralExpression expression,
             @NotNull ExpressionTypingContext context,
             boolean functionTypeExpected
     ) {
         JetFunctionLiteral functionLiteral = expression.getFunctionLiteral();
         JetTypeReference receiverTypeRef = functionLiteral.getReceiverTypeRef();
-        SimpleFunctionDescriptorImpl functionDescriptor = new SimpleFunctionDescriptorImpl(
-                context.scope.getContainingDeclaration(), Collections.<AnnotationDescriptor>emptyList(), Name.special("<anonymous>"), CallableMemberDescriptor.Kind.DECLARATION);
+        AnonymousFunctionDescriptor functionDescriptor = new AnonymousFunctionDescriptor(
+                context.scope.getContainingDeclaration(), Collections.<AnnotationDescriptor>emptyList(), CallableMemberDescriptor.Kind.DECLARATION);
 
         List<ValueParameterDescriptor> valueParameterDescriptors = createValueParameterDescriptors(context, functionLiteral, functionDescriptor, functionTypeExpected);