class="anchor"></a><code><span class="keyword">module</span> <a href="MA/index.html">MA</a> : <span class="keyword">sig</span> ... <span class="keyword">end</span></code></div><dl><dt class="spec value" id="val-scan_left"><a href="#val-scan_left" class="anchor"></a><code><span class="keyword">val</span> scan_left : <span>(<a href="argument-1-Type/index.html#type-t">Type.t</a> <span>&#45;&gt;</span> <span class="type-var">'a</span> <span>&#45;&gt;</span> <a href="argument-1-Type/index.html#type-t">Type.t</a>