Support triagebot assignment and shortcuts

// This program demonstrates the idea of triagebot shortcuts.
// The actual bot integration is not part of the Rust compiler,
// so we just print what a shortcut would do.

fn main() {
    // Simulate a comment containing a shortcut.
    let comment = "@rustbot author";

    // In the real bot, this string would be parsed and an action taken.
    // Here we just show the intended effect.
    if comment.contains("@rustbot author") {
        println!("Assigning PR to the author.");
    } else if comment.contains("@rustbot ready") {
        println!("Marking PR as ready for review.");
    } else {
        println!("No recognized shortcut.");
    }
}