Scrabble solver in Rust

scrabble.rs

use std::io::{self, BufReader};
use std::fs::File;
use std::cmp::Ord;
use std::io::prelude::*;

fn main() {
    // Read the input
    let mut word = String::new();
    print!("Enter your letters: ");
    io::stdout().flush().unwrap();
    io::stdin().read_line(&mut word).expect("could not read stdin");
    // Sort the input word
    let mut word: Vec<_> = word.trim().chars().collect();
    word.sort();

    // Read the file
    let mut answers = Vec::new();
    let file = File::open("dictionary.txt").expect("could not read dictionary");

    'main: for check in BufReader::new(file).lines().map(Result::unwrap) {
        let mut at = 0;
        let mut cs: Vec<_> = check.chars().collect();
        cs.sort();
        'next_letter: for c in cs {
            // We must have enough letters, since sorted just seek forward
            while at < word.len() && word[at] <= c {
                at += 1;
                if word[at - 1] == c {
                    continue 'next_letter;
                }
            }
            // We didn't hit next_letter for all letters, next word
            continue 'main;
        }
        answers.push(check);
    }

    // Sort by length and output first 10
    println!("\nHere are the top 10 suggestions:\n");
    answers.sort_by(|a, b| a.len().cmp(&b.len()).reverse());
    for answer in answers.iter().take(10) {
        println!("{}", answer);
    }
}