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: template.rs
    path of file: ./repos/bottlerocket/sources/api/schnauzer/src/v2
    
    the code of the file until where you have to start completion: //! This module contains functionality for parsing Bottlerocket configuration templates.
//!
//! We use `pest` to disambiguate the TOML frontmatter from the body of the template, then serde to
//! extract the contents of the frontmatter.
use pest::Parser;
use pest_derive::Parser;
use serde::Deserialize;
use snafu::{ensure, OptionExt, ResultExt};
use std::collections::{HashMap, HashSet};
use std::str::FromStr;

#[derive(Parser, Debug, Clone)]
#[grammar = "v2/grammars/template.pest"]
#[grammar = "v2/grammars/t
    
    fn ensure_no_helper_names_collide(&self) -> Result<()> {
        let mut used_helper_names = HashSet::new();
        let mut collisions = HashSet::new();

        let helper_names = self
            .extension_requirements()
            .flat_map(|requirement| requirement.helpers);

        helper_names.for_each(|helper_name| {
            if used_helper_names.contains(&helper_name) {
                collisions.insert(helper_name.clone());
            }
            used_helper_names.insert(helper_name);
        });

        ensure!(
            collisions.is_empty(),
            error::HelperNameCollisionSnafu {
                helper_names: collisions.into_iter().collect::<Vec<_>>()
            }
        );
        Ok(())
    }