Macro rx_channels 

macro_rules! rx_channels {
    (
        $vis:vis struct $channels:ident : $id:ident {
            $(
                $(#[$chan_meta:meta])* $entry:tt => $payload:ty $(= $route:expr)?
            ),+ $(,)?
        }
    ) => { ... };
    ({ $($rest:tt)* }) => { ... };
    ($($rest:tt)+) => { ... };
}

Declares the receive channels of a CuBridge implementation.

See tx_channels! for details on naming and indexing.