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/tonic/tonic-web/tests/integration/src
    
    the code of the file until where you have to start completion: use std::pin::Pin;

use tokio_stream::{self as stream, Stream, StreamExt};
use tonic::{Request, Response, Status, Streaming};

use pb::{test_server::Test, Input, Output};

pub mod pb {
    tonic::include_proto!("test")
    
    async fn unary_call(&self, req: Request<Input>) -> Result<Response<Output>, Status> {
        let req = req.into_inner();

        if &req.desc == "boom" {
            Err(Status::invalid_argument("invalid boom"))
        } else {
            Ok(Response::new(Output {
                id: req.id,
                desc: req.desc,
            }))
        }
    }