"tmd-code-span">ok</code> in the syntax examples)
</th>
<th>
Will Omitting the Optional Result Affect Program Behavior?
</th>
</tr>
<tr>
<th>
map element access
</th>
<td>
<div class="tmd-usual">
<code class="tmd-code-span">e, ok = aMap[key]</code>
</div>
</td>
<td>
<div class="tmd-usual">
whether or not the accessed key is present in the map
</div>
</td>
<td>
<div class="tmd-usual">
No
</div>
</td>
</tr>
<tr>
<th>
channel value receive
</th>
<td>
<div class="tmd-usual">
<code class="tmd-code-span">e, ok = 