Is this common in #rustlang? It doesn't read very well
io::stdin().read_line(&mut guess).expect("Failed to read line");
"If this instance of io::Result is an Err value, expect will cause the program to crash and display the message that you passed as an argument to expect"
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Additionally, `expect` is supposed to panic when Option<T> is None or Result<T, E> is Err<E> by design.
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