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pipes::oneshot functions can't take channels/ports #4027

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@Aatch

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@Aatch

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.

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