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: generated.rs
    path of file: ./repos/node-to-rust/src/crates/day-21/wapc-guest/src
    
    the code of the file until where you have to start completion: extern crate rmp_serde as rmps;
use rmps::{Deserializer, Serializer};
use serde::{Deserialize, Serialize};
use std::io::Cursor;

#[cfg(feature = "guest")]
extern crate wapc_guest as guest;
#[cfg(feature = "guest")]
use guest::pr
    
    pub fn hello(&self, name: String) -> HandlerResult<String> {
        host_call(&self.binding, "", "hello", &serialize(name)?)
            .map(|vec| {
                let resp = deserialize::<String>(vec.as_ref()).unwrap();
                resp
            })
            .map_err(|e| e.into())
    }