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: help.rs
    path of file: ./repos/cargo/src/bin/cargo/commands
    
    the code of the file until where you have to start completion: use crate::aliased_command;
use crate::command_prelude::*;
use cargo::drop_println;
use cargo::util::errors::CargoResult;
use cargo_util::paths::resolve_executable;
use flate2::read::GzDecoder;
use std::ffi::OsStr;
use std::ffi::OsString;
use std::io::Read;
use std::io::Write;
use std::path::Path;

const COMPRESSED_MAN: &[u8] = include_bytes!(concat!(env!("OUT_DIR"), "/man.tgz"));

pub fn cli() -> Command {
    subcommand("help")
        .about("Displays help for a cargo subcommand")
        .arg(Arg::
    
pub fn exec(gctx: &mut GlobalContext, args: &ArgMatches) -> CliResult {
    let subcommand = args.get_one::<String>("COMMAND");
    if let Some(subcommand) = subcommand {
        if !try_help(gctx, subcommand)? {
            match check_builtin(&subcommand) {
                Some(s) => {
                    crate::execute_internal_subcommand(
                        gctx,
                        &[OsStr::new(s), OsStr::new("--help")],
                    )?;
                }
                None => {
                    crate::execute_external_subcommand(
                        gctx,
                        subcommand,
                        &[OsStr::new(subcommand), OsStr::new("--help")],
                    )?;
                }
            }
        }
    } else {
        let mut cmd = crate::cli::cli(gctx);
        let _ = cmd.print_help();
    }
    Ok(())
}