lass="odoc-spec"><div class="spec value anchored" id="val-fail"><a href="#val-fail" class="anchor"></a><code><span><span class="keyword">val</span> fail : <span><span><span>(<span class="type-var">'a</span>, <span>unit <span class="arrow">&#45;&gt;</span></span> <span class="type-var">_</span>)</span> <a href="#type-fmt">fmt</a></span> <span class="arrow">&#45;&gt;</span></span> <span class="type-var">'a</span></span></code></div><div class="spec-doc"><p>Emit a message at the current indentation level, and 