`pipes::send_one` and `pipes::recv_one` (and related functions) throw this error: `copying a non-copyable variable`. This is the minimum code to reproduce it: ``` let (chan, port) = pipes::oneshot(); pipes::send_one(chan, true); ``` That will fail on the second line. This is actually a big problem, since `core::comm` is deprecated I don't really have another way to do this kind of communication.