cargo-mutants 27.0.0

Inject bugs and see if your tests catch them
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pub fn is_even(n: u32) -> bool {
    n % 2 == 0
}

#[cfg(test)]
mod test {
    use super::*;

    #[test]
    fn test_is_even() {
        assert!(is_even(2));
        assert!(!is_even(3));
    }
}