/span></code></div><div class="spec-doc"><p>Initialize the configuration of debug tracing.</p></div></div><div class="odoc-spec"><div class="spec type anchored" id="type-fmt"><a href="#type-fmt" class="anchor"></a><code><span><span class="keyword">type</span> <span>('a, 'b) fmt</span></span><span> = <span><span>(<span class="type-var">'a</span>, <span class="xref-unresolved">Stdlib</span>.Format.formatter, unit, <span class="type-var">'b</span>)</span> <span class="xref-unresolved">Stdlib</span>.format4</sp