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pub fn chmax<T: Ord>( a: &mut T, b: T, ) { if b > *a { *a = b; } } #[cfg(test)] mod tests { use super::*; #[test] fn test() { let mut a = 2; chmax(&mut a, 1); assert_eq!(a, 2); chmax(&mut a, 3); assert_eq!(a, 3); } }