Rust error propagation example

use std::{fs, io, path::Path};

fn read_nonempty(path: &Path) -> Result<String, io::Error> {
    let content = fs::read_to_string(path)?;
    if content.trim().is_empty() {
        return Err(io::Error::new(
            io::ErrorKind::InvalidData,
            "file is empty",
        ));
    }
    Ok(content)
}