lass="variant"><tr id="type-type_role.Param" class="anchored"><td class="def constructor"><a href="#type-type_role.Param" class="anchor"></a><code>| </code><code><span class="constructor">Param</span></code></td></tr><tr id="type-type_role.Ret" class="anchored"><td class="def constructor"><a href="#type-type_role.Ret" class="anchor"></a><code>| </code><code><span class="constructor">Ret</span></code></td></tr></table></dt></dl><dl><dt class="spec value" id="val-check"><a href="#val-check" class="anchor"></a