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/wezterm/termwiz/src/tmux_cc
    
    the code of the file until where you have to start completion: use anyhow::Context;
use parser::Rule;
use pest::iterators::{Pair, Pairs};
use pest::Parser as
    
fn parse_pane_id(pair: Pair<Rule>) -> anyhow::Result<TmuxPaneId> {
    match pair.as_rule() {
        Rule::pane_id => {
            let mut pairs = pair.into_inner();
            pairs
                .next()
                .unwrap()
                .as_str()
                .parse()
                .context("pane_id is somehow not digits")
        }
        _ => anyhow::bail!("parse_pane_id can only parse Rule::pane_id, got {:?}", pair),
    }
}