Also, anyhow::Context provides a convenient way to turn Option and Result> into anyhow::Result

Like this:

use anyhow::Context;

// to my understanding it's better to 
// specify the types when their names 
// are the same as in prelude to improve
// readability and reduce name clashing
fn main() -> anyhow::Result<()> {
    let text = "seeds: 79 14 55 13\nwhatever";
    let seeds: Vec = text
        .lines()
        .next()
        .context("No first line!")?     // This line has changed
        .split_whitespace()
        .skip(1)
        .map(str::parse)
        .collect::>()?;
    println!("seeds: {:?}", seeds);
    Ok(())
}

Edit: line breaks