t;</span></span> <span><span class="label">next</span>:<a href="#type-t">t</a> <span class="arrow">&#45;&gt;</span></span> <span><span class="label">num_iters</span>:int <span class="arrow">&#45;&gt;</span></span> <a href="#type-t">t</a></span></code></div></div></details></div><div class="odoc-spec"><div class="spec value anchored" id="val-subst"><a href="#val-subst" class="anchor"></a><code><span><span class="keyword">val</span> subst : 
  <span><span class="label">callsite</span>:<a href="../../IBase/Loc