Merging upstream version 1.67.1+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

2 files changed, 12 insertions, 2 deletions

diff --git a/library/core/src/cell/lazy.rs b/library/core/src/cell/lazy.rs
index 7844be5f7..b355d94ce 100644
--- a/library/core/src/cell/lazy.rs
+++ b/library/core/src/cell/lazy.rs
@@ -4,6 +4,10 @@ use crate::ops::Deref;
 
 /// A value which is initialized on the first access.
 ///
+/// For a thread-safe version of this struct, see [`std::sync::LazyLock`].
+///
+/// [`std::sync::LazyLock`]: ../../std/sync/struct.LazyLock.html
+///
 /// # Examples
 ///
 /// ```
diff --git a/library/core/src/cell/once.rs b/library/core/src/cell/once.rs
index 3c39394dd..8c01643c7 100644
--- a/library/core/src/cell/once.rs
+++ b/library/core/src/cell/once.rs
@@ -4,8 +4,14 @@ use crate::mem;
 
 /// A cell which can be written to only once.
 ///
-/// Unlike `RefCell`, a `OnceCell` only provides shared `&T` references to its value.
-/// Unlike `Cell`, a `OnceCell` doesn't require copying or replacing the value to access it.
+/// Unlike [`RefCell`], a `OnceCell` only provides shared `&T` references to its value.
+/// Unlike [`Cell`], a `OnceCell` doesn't require copying or replacing the value to access it.
+///
+/// For a thread-safe version of this struct, see [`std::sync::OnceLock`].
+///
+/// [`RefCell`]: crate::cell::RefCell
+/// [`Cell`]: crate::cell::Cell
+/// [`std::sync::OnceLock`]: ../../std/sync/struct.OnceLock.html
 ///
 /// # Examples
 ///