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: command_helper.rs
    path of file: ./repos/rivet/lib/bolt/core/src/utils
    
    the code of the file until where you have to start completion: use anyhow::*;
use std::{
	fmt::Display,
	io::Write,
	process::{Command, Stdio},
};

use async_trait::async_trait;
use tokio::task;

#[derive(thiserror::Error, Clone, Debug)]
enum CommandError {
	#[error("write input: {0}")]
	WriteInput(String),

	#[error("exec: {0}")]
	Exec(String),

	#[error("status: {0}")]
	Status(std::process::ExitStatus),
}

#[async_trait]
pub trait Comma
    
	async fn exec_with_stderr(mut self, quiet: bool) -> Result<()> {
		if !quiet {
			eprintln!("  $ {:?}", self);
		}

		task::spawn_blocking(move || {
			// Execute command
			let output = self
				.output()
				.map_err(|err| CommandError::Exec(err.to_string()))?;

			// Validate success
			if !output.status.success() {
				eprintln!("{}", String::from_utf8(output.stderr)?);

				return Err(CommandError::Status(output.status).into());
			}

			Ok(())
		})
		.await?
	}