You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: lib.rs
    path of file: ./repos/neon/libs/postgres_backend/src
    
    the code of the file until where you have to start completion: //! Server-side asynchronous Postgres connection, as limited as we need.
//! To use, create PostgresBackend and run() it, passing the Handler
//! implementation determining how to proc
    
    fn write_message_noflush(&mut self, msg: &BeMessage<'_>) -> Result<(), ProtocolError> {
        match self {
            MaybeWriteOnly::Full(framed) => framed.write_message(msg),
            MaybeWriteOnly::WriteOnly(framed_writer) => framed_writer.write_message_noflush(msg),
            MaybeWriteOnly::Broken => panic!("IO on invalid MaybeWriteOnly"),
        }
    }