e_reference : <span><a href="#type-module_reference">module_reference</a> <span class="arrow">&#45;&gt;</span></span> <span class="xref-unresolved">Sexplib0</span>.Sexp.t</span></code></div></div><div class="odoc-spec"><div class="spec type anchored" id="type-function_reference"><a href="#type-function_reference" class="anchor"></a><code><span><span class="keyword">type</span> function_reference</span><span> = </span></code><ol><li id="type-function_reference.FunctionName" class="def variant constructor anc