="arrow">&#45;&gt;</span></span> <span><a href="#type-atom">atom</a> <span class="arrow">&#45;&gt;</span></span> <a href="#type-atom">atom</a></span></code></div></div><div class="odoc-spec"><div class="spec value" id="val-instr_sub" class="anchored"><a href="#val-instr_sub" class="anchor"></a><code><span><span class="keyword">val</span> instr_sub : <span><a href="#type-subst">subst</a> <span class="arrow">&#45;&gt;</span></span> <span><a href="../../IR/Sil/index.html#type-instr">IR.Sil.instr</a> <span clas