Function stderr

pub fn stderr() -> Stderr

Available on crate feature io-std only.

Constructs a new handle to the standard error of the current process.

The returned handle allows writing to standard error from the within the Tokio runtime.

Concurrent writes to stderr must be executed with care: Only individual writes to this AsyncWrite are guaranteed to be intact. In particular you should be aware that writes using write_all are not guaranteed to occur as a single write, so multiple threads writing data with write_all may result in interleaved output.

Examples

use tokio::io::{self, AsyncWriteExt};

#[tokio::main]
async fn main() -> io::Result<()> {
    let mut stderr = io::stderr();
    stderr.write_all(b"Print some error here.").await?;
    Ok(())
}