--- a/langtools/src/share/classes/com/sun/tools/javac/comp/TransTypes.java	Tue Aug 11 01:13:14 2009 +0100
+++ b/langtools/src/share/classes/com/sun/tools/javac/comp/TransTypes.java	Tue Aug 11 01:13:42 2009 +0100
@@ -631,7 +631,7 @@
     }
 
     public void visitAssignop(JCAssignOp tree) {
-        tree.lhs = translate(tree.lhs, tree.operator.type.getParameterTypes().head);
+        tree.lhs = translate(tree.lhs, null);
         tree.rhs = translate(tree.rhs, tree.operator.type.getParameterTypes().tail.head);
         tree.type = erasure(tree.type);
         result = tree;