rust/tests/ui/sort_by_key_reverse.rs

// run-rustfix
#![warn(clippy::sort_by_key_reverse)]

use std::cmp::Reverse;

fn id(x: isize) -> isize {
    x
}

fn main() {
    let mut vec: Vec<isize> = vec![3, 6, 1, 2, 5];
    vec.sort_by(|a, b| b.cmp(a));
    vec.sort_by(|a, b| (b + 5).abs().cmp(&(a+5).abs()));
    vec.sort_by(|a, b| id(-b).cmp(&id(-a)));
}