Instrumentation failure of an annotation inside the catch clause

Clover is failing to instrument below section of java 7 code

        try
        {
            innerStream.close();
        }
        catch (@SuppressWarnings("unused") final IOException e)
        {
            // ignore 
        }

This is a perfectly valid java 7 syntax but clover instrumentation fails at @SuppressWarnings("unused") annotation.