ef55a0a92f
Add `slice::check_range` This method is useful for [`RangeBounds`] parameters. It's even been [rewritten](22ee68dc58/src/librustc_data_structures/sorted_map.rs (L214)) [many](22ee68dc58/library/alloc/src/vec.rs (L1299)) [times](22ee68dc58/library/core/src/slice/mod.rs (L2441)) in the standard library, sometimes assuming that the bounds won't be [`usize::MAX`]. For example, [`Vec::drain`] creates an empty iterator when [`usize::MAX`] is used as an inclusive end bound: ```rust assert!(vec![1].drain(..=usize::max_value()).eq(iter::empty())); ``` If this PR is merged, I'll create another to use it for those methods. [`RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html [`usize::MAX`]: https://doc.rust-lang.org/std/primitive.usize.html#associatedconstant.MAX [`Vec::drain`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.drain