Consider adding methods to GenericPort, GenericSmartChan to query whether the other side disconnected

[brson]

The try_recv and try_send methods will return whether the other end hung up, but there's no way to find this information in passing without potentially blocking. peek returns false when the sender has hung up without sending in order to maintain the invariant that whenever peek returns true there is data available.

So far I have not needed this functionality, so I'd suggest not adding it until somebody does.

[metajack]

Instead of more methods, perhaps peek() should return an enum with three states.

[pnkfelix]

visited for triage 16 july 2013. I would suggest closing this bug, and letting someone re-open it when/if such functionality is actually called for.

[alexcrichton]

Closing in favor of #10459