diff -r bf020de5a6db -r 831467c4c6a7 src/share/classes/com/sun/tools/javac/model/JavacTypes.java
--- a/src/share/classes/com/sun/tools/javac/model/JavacTypes.java	Mon Jun 24 22:03:57 2013 -0400
+++ b/src/share/classes/com/sun/tools/javac/model/JavacTypes.java	Tue Jun 25 16:12:53 2013 +0100
@@ -139,7 +139,7 @@
         Type unboxed = types.unboxedType((Type) t);
         if (! unboxed.isPrimitive())    // only true primitives, not void
             throw new IllegalArgumentException(t.toString());
-        return unboxed;
+        return (PrimitiveType)unboxed;
     }
 
     public TypeMirror capture(TypeMirror t) {