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: set_cmd.rs
    path of file: ./repos/sn0int/src/cmd
    
    the code of the file until where you have to start completion: use clap::Parser;
use crate::errors::*;
use crate::shell::Shell;

#[derive(Debug, Parser)]
pub struct Args {
    key: Option<String>,
    value: Option<String>,
}

// TODO: maybe introduce global settings
// TODO: maybe allow setting jobs here as well in addition to -j
pub fn run(rl: &mut Shell, args: &[String]) -> Result<()> {
    let args = Args::try_parse_from(args)?;

    let options = rl.options_mut()
        .ok_or_else(|| format_err!("Module needs to be selected first"))?;

    match (args.key, args.value) {
        (None, None) => {
            for (key, value) in options.iter() {
                println!("{}={:?}", key, value);
            }
        },
        (Som
    
pub fn run(rl: &mut Shell, args: &[String]) -> Result<()> {
    let args = Args::try_parse_from(args)?;

    let options = rl.options_mut()
        .ok_or_else(|| format_err!("Module needs to be selected first"))?;

    match (args.key, args.value) {
        (None, None) => {
            for (key, value) in options.iter() {
                println!("{}={:?}", key, value);
            }
        },
        (Some(key), None) => {
            if let Some(value) = options.get(&key) {
                println!("{:?}", value);
            }
        },
        (Some(key), Some(value)) => {
            options.insert(key, value);
        },
        (None, Some(_)) => unreachable!(),
    }

    Ok(())
}