al-d_error" class="anchored"><a href="#val-d_error" class="anchor"></a><code><span><span class="keyword">val</span> d_error : <span>string <span class="arrow">&#45;&gt;</span></span> unit</span></code></div><div class="spec-doc"><p>dump an error string</p></div></div><div class="odoc-spec"><div class="spec value" id="val-d_warning" class="anchored"><a href="#val-d_warning" class="anchor"></a><code><span><span class="keyword">val</span> d_warning : <span>string <span class="arrow">&#45;&gt;</span></span> uni