tracingで行番号を出すサンプル

main.rs

use anyhow::{anyhow, Result};
use tracing::{instrument};
use tracing_subscriber;

#[instrument(err)]
fn always_err() -> Result<()> {
    info!("test");
    return Err(anyhow!("error"));
}

fn main() {
    tracing_subscriber::fmt()
    .event_format(
        tracing_subscriber::fmt::format()
            .with_file(true)
            .with_line_number(true)
    )
    .init();
    let _ = always_err();
}