nts which can be declared both inside functions and outside any functions</a>.
</div>
</li>
<li class="tmd-list-item">
<div class="tmd-usual">
<a href="#additional-return">Expressions which evaluation results may contain optional additional values</a>.
</div>
</li>
<li class="tmd-list-item">
<div class="tmd-usual">
<a href="#block-forever">Ways to block the current goroutine forever by using the channel mechanism</a>.
</div>
</li>
<li class="tmd-list-item">
<div class="tmd-usual">
<a href="#concatenate-stri