a name="line.169"></a>
<span class="sourceLineNo">170</span>     * @param w0 wrapper for nested value - should not be {@code null}<a name="line.170"></a>
<span class="sourceLineNo">171</span>     * @param w1 wrapper for nested value - should not be {@code null}<a name="line.171"></a>
<span class="sourceLineNo">172</span>     * @return a wrapper for {@code OCamlOption} values<a name="line.172"></a>
<span class="sourceLineNo">173</span>     */<a name="line.173"></a>
<span class="sourceLineNo">174</span>    @S