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123456789101112131415161718192021pub fn add(left: u64, right: u64) -> u64 { left + right}
#[cfg(test)]mod tests { use super::*;
#[test] fn first_test() { let result = add(2, 2); assert_eq!(result, 4);
}
#[test] fn another() { panic!("Make this test fail"); }}