Why do people receive value from a channel, but don't assign it to a variable?

[loud harness]

<-done

[blissful pebble]

As a way of synchronizing their concurrency, perhaps

In your snippet, perhaps something sends to that channel to signify its work is done

[spiral burrow]

used to simply block the current goroutine until someone either sends a value to the channel or until someone closes the channel.