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: mod.rs
    path of file: ./repos/phaser/phaser/vendor/clap/src/completions
    
    the code of the file until where you have to start completion: #[macro_use]
mod macros;
mod bash;
mod elvish;
mod fish;
mod powershell;
mod shell;
mod zsh;

//
    
pub fn all_subcommands(p: &Parser) -> Vec<(String, String)> {
    debugln!("all_subcommands;");
    let mut subcmds: Vec<_> = subcommands_of(p);
    for sc_v in p.subcommands.iter().map(|s| all_subcommands(&s.p)) {
        subcmds.extend(sc_v);
    }
    subcmds
}