use std::io::Read;use std::io::{self};fn main() {    let mut input = String::new();    if let Err(err) = io::stdin().read_to_string(&mut input) {        eprintln!("failed to read stdin: {err}");        std::process::exit(1);    }    let parser = pulldown_cmark::Parser::new(&input);    for event in parser {        println!("{event:?}");    }}