diff --git a/compiler/frontend/src/org/jetbrains/jet/lang/types/TypeUtils.java b/compiler/frontend/src/org/jetbrains/jet/lang/types/TypeUtils.java
index 5499420fbf7..1131672cb3f 100644
--- a/compiler/frontend/src/org/jetbrains/jet/lang/types/TypeUtils.java
+++ b/compiler/frontend/src/org/jetbrains/jet/lang/types/TypeUtils.java
@@ -42,29 +42,29 @@ public class TypeUtils {
         @NotNull
         @Override
         public TypeConstructor getConstructor() {
-            throw new UnsupportedOperationException(); // TODO
+            throw new IllegalStateException();
         }
 
         @NotNull
         @Override
         public List<TypeProjection> getArguments() {
-            throw new UnsupportedOperationException(); // TODO
+            throw new IllegalStateException();
         }
 
         @Override
         public boolean isNullable() {
-            throw new UnsupportedOperationException(); // TODO
+            throw new IllegalStateException();
         }
 
         @NotNull
         @Override
         public JetScope getMemberScope() {
-            throw new UnsupportedOperationException(); // TODO
+            throw new IllegalStateException();
         }
 
         @Override
         public List<AnnotationDescriptor> getAnnotations() {
-            throw new UnsupportedOperationException(); // TODO
+            throw new IllegalStateException();
         }
 
         @Override