From 4e2f331f872ba43e43fc62792ce4c96827fd4c7a Mon Sep 17 00:00:00 2001
From: Eman Resu <78693624+quatquatt@users.noreply.github.com>
Date: Thu, 18 Jun 2026 12:44:57 -0400
Subject: [PATCH] lib.lists.toposort: avoid reversing element causing a cycle

---
 lib/lists.nix | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/lists.nix b/lib/lists.nix
index 75cdf3cbf499..9863c064426d 100644
--- a/lib/lists.nix
+++ b/lib/lists.nix
@@ -1262,7 +1262,7 @@ rec {
         else if dfsthis ? cycle then
           # there's a cycle, starting from the current vertex, return it
           {
-            cycle = reverseList ([ dfsthis.cycle ] ++ dfsthis.visited);
+            cycle = reverseList dfsthis.visited ++ [ dfsthis.cycle ];
             inherit (dfsthis) loops;
           }
         else if toporest ? cycle then