class ArrayIndexTest {
    public void write(byte b) {
    	/*dummy */
    }

    /*@
      @ requires offset >= 0 && offset + len <= what.length;
      @*/
    public void write(/*@non_null@*/byte[] what, int offset, int len) {
    	for (int i = 0; i < len ; i++)
	    write(what[offset+i]);
    }
}