error: use Vec::sort here instead
  --> $DIR/unnecessary_sort_by.rs:14:5
   |
LL |     vec.sort_by(|a, b| a.cmp(b));
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `vec.sort()`
   |
   = note: `-D clippy::unnecessary-sort-by` implied by `-D warnings`

error: use Vec::sort here instead
  --> $DIR/unnecessary_sort_by.rs:15:5
   |
LL |     vec.sort_unstable_by(|a, b| a.cmp(b));
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `vec.sort_unstable()`

error: use Vec::sort_by_key here instead
  --> $DIR/unnecessary_sort_by.rs:16:5
   |
LL |     vec.sort_by(|a, b| (a + 5).abs().cmp(&(b + 5).abs()));
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `vec.sort_by_key(|&a| (a + 5).abs())`

error: use Vec::sort_by_key here instead
  --> $DIR/unnecessary_sort_by.rs:17:5
   |
LL |     vec.sort_unstable_by(|a, b| id(-a).cmp(&id(-b)));
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `vec.sort_unstable_by_key(|&a| id(-a))`

error: use Vec::sort_by_key here instead
  --> $DIR/unnecessary_sort_by.rs:19:5
   |
LL |     vec.sort_by(|a, b| b.cmp(a));
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `vec.sort_by_key(|&b| Reverse(b))`

error: use Vec::sort_by_key here instead
  --> $DIR/unnecessary_sort_by.rs:20:5
   |
LL |     vec.sort_by(|a, b| (b + 5).abs().cmp(&(a + 5).abs()));
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `vec.sort_by_key(|&b| Reverse((b + 5).abs()))`

error: use Vec::sort_by_key here instead
  --> $DIR/unnecessary_sort_by.rs:21:5
   |
LL |     vec.sort_unstable_by(|a, b| id(-b).cmp(&id(-a)));
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `vec.sort_unstable_by_key(|&b| Reverse(id(-b)))`

error: aborting due to 7 previous errors