="keyword">val</span> desc_custom_error : <span><a href="../../IBase/Location/index.html#type-t">IBase.Location.t</a> <span class="arrow">&#45;&gt;</span></span> <a href="#type-error_desc">error_desc</a></span></code></div><div class="spec-doc"><p>Create human-readable error description for assertion failures</p></div></div><div class="odoc-spec"><div class="spec type anchored" id="type-pnm_kind"><a href="#type-pnm_kind" class="anchor"></a><code><span><span class="keyword">type</span> pnm_kind</span><span> 