diff --git a/library/alloc/src/vec/mod.rs b/library/alloc/src/vec/mod.rs
index f3a47cba759..4ac28b8308e 100644
--- a/library/alloc/src/vec/mod.rs
+++ b/library/alloc/src/vec/mod.rs
@@ -2411,18 +2411,13 @@ fn clone_from(&mut self, other: &Self) {
 /// as required by the `core::borrow::Borrow` implementation.
 ///
 /// ```
-/// use std::hash::{BuildHasher, Hash, Hasher};
-///
-/// fn hash_of(x: impl Hash, b: &impl BuildHasher) -> u64 {
-///     let mut h = b.build_hasher();
-///     x.hash(&mut h);
-///     h.finish()
-/// }
+/// #![feature(build_hasher_simple_hash_one)]
+/// use std::hash::BuildHasher;
 ///
 /// let b = std::collections::hash_map::RandomState::new();
 /// let v: Vec<u8> = vec![0xa8, 0x3c, 0x09];
 /// let s: &[u8] = &[0xa8, 0x3c, 0x09];
-/// assert_eq!(hash_of(v, &b), hash_of(s, &b));
+/// assert_eq!(b.hash_one(v), b.hash_one(s));
 /// ```
 #[stable(feature = "rust1", since = "1.0.0")]
 impl<T: Hash, A: Allocator> Hash for Vec<T, A> {
diff --git a/library/core/src/array/mod.rs b/library/core/src/array/mod.rs
index f44e22b3dbd..030b42a53d0 100644
--- a/library/core/src/array/mod.rs
+++ b/library/core/src/array/mod.rs
@@ -143,18 +143,13 @@ fn borrow_mut(&mut self) -> &mut [T] {
 /// as required by the `Borrow` implementation.
 ///
 /// ```
-/// use std::hash::{BuildHasher, Hash, Hasher};
-///
-/// fn hash_of(x: impl Hash, b: &impl BuildHasher) -> u64 {
-///     let mut h = b.build_hasher();
-///     x.hash(&mut h);
-///     h.finish()
-/// }
+/// #![feature(build_hasher_simple_hash_one)]
+/// use std::hash::BuildHasher;
 ///
 /// let b = std::collections::hash_map::RandomState::new();
 /// let a: [u8; 3] = [0xa8, 0x3c, 0x09];
 /// let s: &[u8] = &[0xa8, 0x3c, 0x09];
-/// assert_eq!(hash_of(a, &b), hash_of(s, &b));
+/// assert_eq!(b.hash_one(a), b.hash_one(s));
 /// ```
 #[stable(feature = "rust1", since = "1.0.0")]
 impl<T: Hash, const N: usize> Hash for [T; N] {