><span class="keyword">val</span> pure : <a href="index.html#type-t">t</a></code></dt><dt class="spec value" id="val-is_pure"><a href="#val-is_pure" class="anchor"></a><code><span class="keyword">val</span> is_pure : <a href="index.html#type-t">t</a> <span>&#45;&gt;</span> bool</code></dt></dl><dl><dt class="spec type" id="type-param_source"><a href="#type-param_source" class="anchor"></a><code><span class="keyword">type</span> param_source</code><code> = </code><table class="variant"><tr id="type-param_sou