 option</span>;</span></code></li></ol><code><span>}</span></code></div><div class="spec-doc"><p>description field of error messages</p></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-compare_error_desc"><a href="#val-compare_error_desc" class="anchor"></a><code><span><span class="keyword">val</span> compare_error_desc : <span><a href="#type-error_desc">error_desc</a> <span class="arrow">&#45;&gt;</span></span> <span><a href="#type-error_desc">error_desc</a> <span class="arrow">&