tokio: add mpsc::Receiver::max_capacity
and mpsc::Receiver::capacity
#6511
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Motivation
mpsc::Sender
hasmax_capacity
andcapacity
methods, howevermpsc::Receiver
does not. It may help to have these methods when trying to pre-allocate forReceiver::recv_many
.Solution
Adds
Receiver::max_capacity
andReceiver::capacity
.