std::comm::Receiver -> std::sync::mpsc::Receiver
std::comm::Receiver -> std::sync::mpsc::Receiver

tempbottle/capnproto-rust,dwrensha/capnproto-rust,maurer/capnproto-rust,danburkert/capnproto-rust,larquin/capnproto-rust,placrosse/capnproto-rust