From c18bab3fe64c8786c26ac483dac13f615e544276 Mon Sep 17 00:00:00 2001
From: David Ross <daboross@daboross.net>
Date: Mon, 21 Oct 2024 20:05:55 -0700
Subject: [PATCH] Document PartialEq impl for OnceLock

---
 library/std/src/sync/once_lock.rs | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/library/std/src/sync/once_lock.rs b/library/std/src/sync/once_lock.rs
index be615a5a8ef..0ae3cf4df36 100644
--- a/library/std/src/sync/once_lock.rs
+++ b/library/std/src/sync/once_lock.rs
@@ -634,6 +634,26 @@ fn from(value: T) -> Self {
 
 #[stable(feature = "once_cell", since = "1.70.0")]
 impl<T: PartialEq> PartialEq for OnceLock<T> {
+    /// Equality for two `OnceLock`s.
+    ///
+    /// Two `OnceLock`s are equal if they either both contain values and their
+    /// values are equal, or if neither contains a value.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::sync::OnceLock;
+    ///
+    /// let five = OnceLock::new();
+    /// five.set(5).unwrap();
+    ///
+    /// let also_five = OnceLock::new();
+    /// also_five.set(5).unwrap();
+    ///
+    /// assert!(five == also_five);
+    ///
+    /// assert!(OnceLock::<u32>::new() == OnceLock::<u32>::new());
+    /// ```
     #[inline]
     fn eq(&self, other: &OnceLock<T>) -> bool {
         self.get() == other.get()