Function erlang_port::receive

pub fn receive<T>(reader: &mut Read) -> Option<T> where
    T: CommandParser, 

Reads a single port message from a stream.

Attempts to read a single message from a Read. If there are no more messages returns None. if there's a problem reading the message it will panic.

Each message is expected to start with a 4 byte message size, as happens when you open an Erlang port in {:packet, 4} mode.