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: fish.rs
    path of file: ./repos/clap/clap_complete/src/shells
    
    the code of the file until where you have to start completion: use std::io::Write;

use clap::*;

use crate::generator::{uti
    
    fn generate(&self, cmd: &Command, buf: &mut dyn Write) {
        let bin_name = cmd
            .get_bin_name()
            .expect("crate::generate should have set the bin_name");

        let mut buffer = String::new();
        gen_fish_inner(bin_name, &[], cmd, &mut buffer);
        w!(buf, buffer.as_bytes());
    }