From 8e88383822fa25156ab1e15f422dcdad9ecef1ce Mon Sep 17 00:00:00 2001
From: tison <wander4096@gmail.com>
Date: Wed, 21 Jan 2026 13:35:08 +0800
Subject: [PATCH] chore: drop Clone trait bound for OnceMap keys

Signed-off-by: tison <wander4096@gmail.com>
---
 CHANGELOG.md                 |  7 +++++++
 mea/src/once/once_map/mod.rs | 10 +++++-----
 2 files changed, 12 insertions(+), 5 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 78a3845..c55bbe8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,12 +4,19 @@ All notable changes to this project will be documented in this file.
 
 ## Unreleased
 
+### Improvements
+
+* `OnceMap` no longer requires `K: Clone` everywhere.
+
 ## [0.6.2] - 2026-01-21
 
 ### New features
 
 * Implement `once::OnceMap` to run computation only once and store the results in a hash map.
 * `singleflight::Group` now supports custom hashers for keys.
+
+### Improvements
+
 * `singleflight::Group::forget` now accepts any `&Q` where `Q: ?Sized + Hash + Eq` and `K: Borrow<Q>` aligning with standard HashMap's interface.
 
 ## [0.6.1] - 2026-01-11
diff --git a/mea/src/once/once_map/mod.rs b/mea/src/once/once_map/mod.rs
index b4087f1..e3f1179 100644
--- a/mea/src/once/once_map/mod.rs
+++ b/mea/src/once/once_map/mod.rs
@@ -36,7 +36,7 @@ pub struct OnceMap<K, V, S = RandomState> {
 
 impl<K, V, S> Default for OnceMap<K, V, S>
 where
-    K: Eq + Hash + Clone,
+    K: Eq + Hash,
     V: Clone,
     S: BuildHasher + Clone + Default,
 {
@@ -47,7 +47,7 @@ where
 
 impl<K, V> OnceMap<K, V, RandomState>
 where
-    K: Eq + Hash + Clone,
+    K: Eq + Hash,
     V: Clone,
 {
     /// Creates a new OnceMap with the default hasher.
@@ -67,7 +67,7 @@ where
 
 impl<K, V, S> OnceMap<K, V, S>
 where
-    K: Eq + Hash + Clone,
+    K: Eq + Hash,
     V: Clone,
     S: BuildHasher + Clone,
 {
@@ -96,7 +96,7 @@ where
         // 1. Get or create the OnceCell.
         let cell = {
             let mut map = self.map.lock();
-            map.entry(key.clone())
+            map.entry(key)
                 .or_insert_with(|| Arc::new(OnceCell::new()))
                 .clone()
         };
@@ -121,7 +121,7 @@ where
         // 1. Get or create the OnceCell.
         let cell = {
             let mut map = self.map.lock();
-            map.entry(key.clone())
+            map.entry(key)
                 .or_insert_with(|| Arc::new(OnceCell::new()))
                 .clone()
         };