From 1052f4d7839c6b7214d75f82f7417ca543babac6 Mon Sep 17 00:00:00 2001
From: Markus Reiter <me@reitermark.us>
Date: Sun, 6 Apr 2025 01:11:24 +0200
Subject: [PATCH] Also relax bounds on `PartialEq` for `LinearMap`.

---
 CHANGELOG.md      |  4 ++--
 src/linear_map.rs | 15 +++++++++++----
 2 files changed, 13 insertions(+), 6 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3a4e64b8..953abcff 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,8 +7,6 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased]
 
-- Relax bounds on `IndexMap` from `V: Eq` to `V: PartialEq`.
-
 ### Added
 
 - Added `format` macro.
@@ -60,6 +58,8 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 - Changed `stable_deref_trait` to a platform-dependent dependency.
 - Changed `SortedLinkedList::pop` return type from `Result<T, ()>` to `Option<T>` to match `std::vec::pop`.
 - `Vec::capacity` is no longer a `const` function.
+- Relaxed bounds on `PartialEq` for `IndexMap` from `V: Eq` to `V1: PartialEq<V2>`.
+- Relaxed bounds on `PartialEq` for `LinearMap` from `V: PartialEq` to `V1: PartialEq<V2>`.
 
 ### Fixed
 
diff --git a/src/linear_map.rs b/src/linear_map.rs
index d4e137cc..c96dece1 100644
--- a/src/linear_map.rs
+++ b/src/linear_map.rs
@@ -614,13 +614,13 @@ impl<'a, K, V> Iterator for IterMut<'a, K, V> {
     }
 }
 
-impl<K, V, S1: LinearMapStorage<K, V> + ?Sized, S2: LinearMapStorage<K, V> + ?Sized>
-    PartialEq<LinearMapInner<K, V, S2>> for LinearMapInner<K, V, S1>
+impl<K, V1, V2, S1: LinearMapStorage<K, V1> + ?Sized, S2: LinearMapStorage<K, V2> + ?Sized>
+    PartialEq<LinearMapInner<K, V2, S2>> for LinearMapInner<K, V1, S1>
 where
     K: Eq,
-    V: PartialEq,
+    V1: PartialEq<V2>,
 {
-    fn eq(&self, other: &LinearMapInner<K, V, S2>) -> bool {
+    fn eq(&self, other: &LinearMapInner<K, V2, S2>) -> bool {
         self.len() == other.len()
             && self
                 .iter()
@@ -745,4 +745,11 @@ mod test {
     ) -> &'c LinearMapView<&'b (), u32> {
         x
     }
+
+    #[test]
+    fn partial_eq_floats() {
+        // Make sure `PartialEq` is implemented even if `V` doesn't implement `Eq`.
+        let map: LinearMap<usize, f32, 4> = Default::default();
+        assert_eq!(map, map);
+    }
 }