From 331c4cf6997c480aee2575a8fd3c6333def3a6d5 Mon Sep 17 00:00:00 2001
From: h7x4 <h7x4@nani.wtf>
Date: Thu, 30 Jul 2026 23:49:08 +0900
Subject: [PATCH] lib: improve implementation of `foldAttrs`

---
 lib/attrsets.nix | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/lib/attrsets.nix b/lib/attrsets.nix
index d006ed79a2ae..14b1e014509b 100644
--- a/lib/attrsets.nix
+++ b/lib/attrsets.nix
@@ -832,9 +832,7 @@ rec {
   */
   foldAttrs =
     op: nul: list_of_attrs:
-    foldr (
-      n: a: foldr (name: o: o // { ${name} = op n.${name} (a.${name} or nul); }) a (attrNames n)
-    ) { } list_of_attrs;
+    mapAttrs (name: foldr op nul) (zipAttrs list_of_attrs);
 
   /**
     Recursively collect sets that verify a given predicate named `pred`