raint.ForNonUIThread" class="anchor"></a><code>| </code><code><span class="constructor">ForNonUIThread</span></code></td></tr><tr id="type-scheduler_thread_constraint.ForUnknownThread" class="anchored"><td class="def constructor"><a href="#type-scheduler_thread_constraint.ForUnknownThread" class="anchor"></a><code>| </code><code><span class="constructor">ForUnknownThread</span></code></td></tr></table></dt><dd><p>an instance field holding a reference to an executor may be annotated as running on UI/non-UI t