What are some use cases of memconn?

[feisuzhu]

The whole thing is cool but I can't think of a use case.
This should be written in README.

[advdv]

I use it for locally testing a network large number of tcp clients/servers. since net.Listener and net.Conn are interfaces the memconn implementations can be replaced by actual tcp implementations for the real implementation

[james-lawrence]

in process services as well. for example pub/sub implementations. basically anytime you want to process a stream of data and have unique addresses to talk to.
basically its an io.Pipe with a network interface.