bug 335792 - correct error in previous commit
diff --git a/bundles/org.eclipse.core.databinding.observable/src/org/eclipse/core/databinding/observable/Observables.java b/bundles/org.eclipse.core.databinding.observable/src/org/eclipse/core/databinding/observable/Observables.java
index c20c451..e87df88 100644
--- a/bundles/org.eclipse.core.databinding.observable/src/org/eclipse/core/databinding/observable/Observables.java
+++ b/bundles/org.eclipse.core.databinding.observable/src/org/eclipse/core/databinding/observable/Observables.java
@@ -575,7 +575,7 @@
 			}
 
 			public synchronized void addSetChangeListener(
-					ISetChangeListener<E> listener) {
+					ISetChangeListener<? super E> listener) {
 			}
 		};
 	}
@@ -752,7 +752,7 @@
 			}
 
 			public synchronized void addListChangeListener(
-					IListChangeListener<E> listener) {
+					IListChangeListener<? super E> listener) {
 			}
 		};
 	}