e_quals</a></span> <span>&#45;&gt;</span> <span>?&#8288;is_const:bool</span> <span>&#45;&gt;</span> <span>?&#8288;is_restrict:bool</span> <span>&#45;&gt;</span> <span>?&#8288;is_volatile:bool</span> <span>&#45;&gt;</span> unit <span>&#45;&gt;</span> <a href="index.html#type-type_quals">type_quals</a></code></dt><dt class="spec value" id="val-is_const"><a href="#val-is_const" class="anchor"></a><code><span class="keyword">val</span> is_const : <a href="index.html#type-type_quals">type_quals</a> <span>&#45;&g