use anyhow::{anyhow, bail, Context};use std::{io, io::Write}; fn main() -> anyhow::Result<()> {    let mut args = std::env::args().skip(1);    let cmd = args        .next()        .ok_or_else(|| anyhow!("The first argument is the subcommand"))?;     match cmd.as_str() {        "crate-path" => {            let crate_name = args                .next()                .ok_or_else(|| anyhow!("The first argument is the name of the crate whose path "))?;            let crate_dir = std::env::current_dir()?.join(&crate_name);            let cargo_toml_path = crate_dir.join("Cargo.toml");            let manifest = cargo_toml::Manifest::from_path(&cargo_toml_path)                .with_context(|| format!("Couldn't read Cargo manifest at '{}'", cargo_toml_path.display()))?;            let version = manifest                .package                .ok_or_else(|| anyhow!("Need package information"))                .map(|p| p.version)?;            writeln!(io::stdout(), "{}/{}", crate_name, version)?;        }        cmd => bail!("Unknown subcommand: {}", cmd),    }    Ok(())}