begins. Communication blocks until the send can proceed.
A send on an unbuffered channel can proceed if a receiver is ready.
A send on a buffered channel can proceed if there is room in the buffer.
A send on a closed channel proceeds by causing a <a href="#Run_time_panics">run-time panic</a>.
A send on a <code>nil</code> channel blocks forever.
</p>

<pre>
ch &lt;- 3  // send value 3 to channel ch
</pre>

pkg syscall (darwin-arm64), const SYS_SENDMSG_NOCANCEL ideal-int
pkg syscall (darwin-arm64), const SYS_SENDTO = 133
pkg syscall (darwin-arm64), const SYS_SENDTO ideal-int
pkg syscall (darwin-arm64), const SYS_SENDTO_NOCANCEL = 413
pkg syscall (darwin-arm64), const SYS_SENDTO_NOCANCEL ideal-int
pkg syscall (darwin-arm64), const SYS_SETATTRLIST = 221
pkg syscall (darwin-arm64), const SYS_SETATTRLIST ideal-int

pkg syscall (freebsd-arm64), const SYS_SENDMSG = 28
pkg syscall (freebsd-arm64), const SYS_SENDMSG ideal-int
pkg syscall (freebsd-arm64), const SYS_SENDTO = 133
pkg syscall (freebsd-arm64), const SYS_SENDTO ideal-int
pkg syscall (freebsd-arm64), const SYS_SETAUDIT = 450
pkg syscall (freebsd-arm64), const SYS_SETAUDIT ideal-int
pkg syscall (freebsd-arm64), const SYS_SETAUDIT_ADDR = 452

pkg syscall (freebsd-riscv64), const SYS_SENDMSG = 28 #53466
pkg syscall (freebsd-riscv64), const SYS_SENDMSG ideal-int #53466
pkg syscall (freebsd-riscv64), const SYS_SENDTO = 133 #53466
pkg syscall (freebsd-riscv64), const SYS_SENDTO ideal-int #53466
pkg syscall (freebsd-riscv64), const SYS_SETAUDIT = 450 #53466
pkg syscall (freebsd-riscv64), const SYS_SETAUDIT ideal-int #53466

begins. Communication blocks until the send can proceed.
A send on an unbuffered channel can proceed if a receiver is ready.
A send on a buffered channel can proceed if there is room in the buffer.
A send on a closed channel proceeds by causing a <a href="#Run_time_panics">run-time panic</a>.
A send on a <code>nil</code> channel blocks forever.
</p>

<pre>
ch &lt;- 3  // send value 3 to channel ch
</pre>

// implied by the type argument.
func clear[T ~[]Type | ~map[Type]Type1](t T)

// The close built-in function closes a channel, which must be either
// bidirectional or send-only. It should be executed only by the sender,
// never the receiver, and has the effect of shutting down the channel after
// the last sent value is received. After the last value has been received

<h3 id="chan">Channel communication</h3>

<p>
Channel communication is the main method of synchronization
between goroutines.  Each send on a particular channel
is matched to a corresponding receive from that channel,
usually in a different goroutine.
</p>

<p class="rule">
A send on a channel is synchronized before the completion of the
corresponding receive from that channel.
</p>

<p>
This program:
</p>