ex8_4

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Overview

Modify the `reverb2` server to use a `sync.WaitGroup` per connection to count the number of active echo goroutines. When it falls to zero, close the write half of the TCP connection as described in Exercise 8.3. Verify that your modified `netcat3` client from that exercise waits for the final echoes of multiple concurrent shouts, even after the standard input has been closed.