diff --git a/compiler/frontend/src/org/jetbrains/jet/renderer/DescriptorRendererImpl.java b/compiler/frontend/src/org/jetbrains/jet/renderer/DescriptorRendererImpl.java
index 5fba99a6bfa..f93ed7b8027 100644
--- a/compiler/frontend/src/org/jetbrains/jet/renderer/DescriptorRendererImpl.java
+++ b/compiler/frontend/src/org/jetbrains/jet/renderer/DescriptorRendererImpl.java
@@ -22,6 +22,7 @@ import com.intellij.psi.tree.IElementType;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.jet.lang.descriptors.*;
 import org.jetbrains.jet.lang.resolve.DescriptorUtils;
+import org.jetbrains.jet.lang.resolve.calls.CallResolverUtil;
 import org.jetbrains.jet.lang.resolve.name.FqName;
 import org.jetbrains.jet.lang.resolve.name.FqNameUnsafe;
 import org.jetbrains.jet.lang.resolve.name.Name;
@@ -148,6 +149,12 @@ public class DescriptorRendererImpl implements DescriptorRenderer {
         if (type == null) {
             return escape("[NULL]");
         }
+        else if (type == CallResolverUtil.DONT_CARE || type == CallResolverUtil.CANT_INFER) {
+            return escape("???");
+        }
+        else if (type == CallResolverUtil.PLACEHOLDER_FUNCTION_TYPE) {
+            return escape("??? -> ???");
+        }
         else if (ErrorUtils.isErrorType(type)) {
             return escape(type.toString());
         }