e><code><span class="constructor">Nothing</span></code></td></tr><tr id="type-t.Functional" class="anchored"><td class="def constructor"><a href="#type-t.Functional" class="anchor"></a><code>| </code><code><span class="constructor">Functional</span></code></td><td class="doc"><p>holds a value returned from a callee marked <code>@Functional</code></p></td></tr><tr id="type-t.OnMainThread" class="anchored"><td class="def constructor"><a href="#type-t.OnMainThread" class="anchor"></a><code>| </code><code><span