diff --git a/plugins/org.eclipse.xtext.xbase/src/org/eclipse/xtext/xbase/typesystem/computation/XbaseTypeComputer.java b/plugins/org.eclipse.xtext.xbase/src/org/eclipse/xtext/xbase/typesystem/computation/XbaseTypeComputer.java
index <HASH>..<HASH> 100644
--- a/plugins/org.eclipse.xtext.xbase/src/org/eclipse/xtext/xbase/typesystem/computation/XbaseTypeComputer.java
+++ b/plugins/org.eclipse.xtext.xbase/src/org/eclipse/xtext/xbase/typesystem/computation/XbaseTypeComputer.java
@@ -656,6 +656,10 @@ public class XbaseTypeComputer implements ITypeComputer {
 			public LightweightTypeReference doVisitArrayTypeReference(ArrayTypeReference reference) {
 				return reference.getComponentType();
 			}
+			@Override
+			protected LightweightTypeReference doVisitUnboundTypeReference(UnboundTypeReference reference) {
+				return null;
+			}
 		});
 		return parameterType;
 	}
[xbase][operators] spaceship bound to Comparable.compareTo and dies for other operators

Change-Id: I<I>b1d<I>f1ce6f2dbf5b<I>c<I>ede<I>