This skeleton program gives an error (invalid digit) on the second pass through the loop, when the digit is correct.

use std::io;

fn main() {
	let mut inp = String::new();
	loop {
		println!("What do you want to do?");
		println!(" 1. Some option");
		println!(" 2. Another option");
		// ...... further options
		println!(" 0. Exit");

		io::stdin()
			.read_line(&mut inp)
			.expect("Failed to read line");
		let choice: u32 = inp.trim().parse().expect("Not a number!");
		if choice == 0 { println!("Goodbye!"); break }
	}
}

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