--- a/graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/util/GraphUtil.java	Sun Feb 22 23:12:31 2015 +0100
+++ b/graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/util/GraphUtil.java	Sun Feb 22 23:44:37 2015 +0100
@@ -49,7 +49,7 @@
             // We reached a control flow end.
             AbstractEndNode end = (AbstractEndNode) node;
             killEnd(end, tool);
-        } else {
+        } else if (node instanceof FixedNode) {
             // Normal control flow node.
             /*
              * We do not take a successor snapshot because this iterator supports concurrent
@@ -116,11 +116,11 @@
         if (node != null && node.isAlive()) {
             node.unsafeDelete();
 
-            for (Node in : node.inputs()) {
+            node.acceptInputs(in -> {
                 if (in.isAlive() && in.hasNoUsages() && !(in instanceof FixedNode)) {
                     killWithUnusedFloatingInputs(in);
                 }
-            }
+            });
 
             ArrayList<Node> usageToKill = null;
             for (Node usage : node.usages()) {