succeeds only when both a sender and receiver are ready. Otherwise, the channel
is buffered and communication succeeds without blocking if the buffer
is not full (sends) or not empty (receives).
A <code>nil</code> channel is never ready for communication.
</p>

<p>
A channel may be closed with the built-in function
<a href="#Close"><code>close</code></a>.

pkg log/syslog (darwin-arm64-cgo), type Writer struct
pkg math/bits (darwin-arm64), const UintSize = 64
pkg math/bits (darwin-arm64-cgo), const UintSize = 64
pkg os (darwin-arm64), const DevNull = "/dev/null"
pkg os (darwin-arm64), const O_APPEND = 8
pkg os (darwin-arm64), const O_CREATE = 512
pkg os (darwin-arm64), const O_EXCL = 2048
pkg os (darwin-arm64), const O_SYNC = 128
pkg os (darwin-arm64), const O_TRUNC = 1024

pkg os, func UserConfigDir() (string, error)
pkg os, method (*LinkError) Unwrap() error
pkg os, method (*PathError) Unwrap() error
pkg os, method (*SyscallError) Unwrap() error
pkg os (netbsd-arm64-cgo), const DevNull = "/dev/null"
pkg os (netbsd-arm64-cgo), const O_APPEND = 8
pkg os (netbsd-arm64-cgo), const O_CREATE = 512
pkg os (netbsd-arm64-cgo), const O_EXCL = 2048
pkg os (netbsd-arm64-cgo), const O_SYNC = 128