keyword">val</span> merge : <span><span class="label">from</span>:<a href="#type-t">t</a> <span class="arrow">&#45;&gt;</span></span> <span><span class="label">to_</span>:<a href="#type-t">t</a> <span class="arrow">&#45;&gt;</span></span> unit</span></code></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-pp_equalities"><a href="#val-pp_equalities" class="anchor"></a><code><span><span class="keyword">val</span> pp_equalities : <span><span class="xref-unresolved">F</span>.formatter 