>.Format.formatter, unit )</span> <a href="../../IStdlib/IStd/index.html#type-format">IStdlib.IStd.format</a></span> <span class="arrow">&#45;&gt;</span></span> <span class="type-var">'a</span></span></code></div><div class="spec-doc"><p>For debugging during development.</p></div></div><div class="odoc-spec"><div class="spec type" id="type-ocaml_pos" class="anchored"><a href="#type-ocaml_pos" class="anchor"></a><code><span><span class="keyword">type</span> ocaml_pos</span><span> = string * int * int * int</