Auto merge of rust-lang#111934 - scottmcm:stabilize-hash-one, r=Amanieu

Stabilize `BuildHasher::hash_one`

FCP completed in rust-lang#86161 (comment)

Author: bors

library/alloc/src/vec/mod.rs

@@ -2662,7 +2662,6 @@ impl<T: Clone, A: Allocator + Clone> Clone for Vec<T, A> {
 /// as required by the `core::borrow::Borrow` implementation.
 ///
 /// ```
-/// #![feature(build_hasher_simple_hash_one)]
 /// use std::hash::BuildHasher;
 ///
 /// let b = std::collections::hash_map::RandomState::new();

library/core/src/array/mod.rs

@@ -291,7 +291,6 @@ impl<'a, T, const N: usize> TryFrom<&'a mut [T]> for &'a mut [T; N] {
 /// as required by the `Borrow` implementation.
 ///
 /// ```
-/// #![feature(build_hasher_simple_hash_one)]
 /// use std::hash::BuildHasher;
 ///
 /// let b = std::collections::hash_map::RandomState::new();

library/core/src/hash/mod.rs

@@ -674,8 +674,6 @@ pub trait BuildHasher {
     /// # Example
     ///
     /// ```
-    /// #![feature(build_hasher_simple_hash_one)]
-    ///
     /// use std::cmp::{max, min};
     /// use std::hash::{BuildHasher, Hash, Hasher};
     /// struct OrderAmbivalentPair<T: Ord>(T, T);
@@ -697,7 +695,7 @@ pub trait BuildHasher {
     ///     bh.hash_one(&OrderAmbivalentPair(2, 10))
     /// );
     /// ```
-    #[unstable(feature = "build_hasher_simple_hash_one", issue = "86161")]
+    #[stable(feature = "build_hasher_simple_hash_one", since = "CURRENT_RUSTC_VERSION")]
     fn hash_one<T: Hash>(&self, x: T) -> u64
     where
         Self: Sized,