the <code>print</code>.
</p>

<p class="rule">
The closing of a channel is synchronized before a receive that returns a zero value
because the channel is closed.
</p>

<p>
In the previous example, replacing
<code>c &lt;- 0</code> with <code>close(c)</code>
yields a program with the same guaranteed behavior.
</p>

<p class="rule">
A receive from an unbuffered channel is synchronized before the completion of

they cannot be used as function values.
</p>

<h3 id="Close">Close</h3>

<p>
For a channel <code>c</code>, the built-in function <code>close(c)</code>
records that no more values will be sent on the channel.
It is an error if <code>c</code> is a receive-only channel.
Sending to or closing a closed channel causes a <a href="#Run_time_panics">run-time panic</a>.

</p>


<h3 id="Close">Close</h3>

<p>
For an argument <code>ch</code> with a <a href="#Core_types">core type</a>
that is a <a href="#Channel_types">channel</a>, the built-in function <code>close</code>
records that no more values will be sent on the channel.
It is an error if <code>ch</code> is a receive-only channel.