1 error[E0658]: use of unstable library feature 'is_sorted': new API (see issue #53485)
2 --> $DIR/feature-gate-is_sorted.rs:12:33
4 LL | assert!([1, 2, 2, 9].iter().is_sorted());
7 = help: add #![feature(is_sorted)] to the crate attributes to enable
9 error[E0658]: use of unstable library feature 'is_sorted': new API (see issue #53485)
10 --> $DIR/feature-gate-is_sorted.rs:14:39
12 LL | assert!(![-2i32, -1, 0, 3].iter().is_sorted_by_key(|n| n.abs()));
15 = help: add #![feature(is_sorted)] to the crate attributes to enable
17 error: aborting due to 2 previous errors
19 For more information about this error, try `rustc --explain E0658`.