From 577d58a8e01aead5eb237d39a6d7df1fb7aa00c4 Mon Sep 17 00:00:00 2001
From: Jacek Galowicz <jacek@galowicz.de>
Date: Thu, 28 Jan 2021 08:51:21 +0100
Subject: [PATCH] Deprecate lib.crossLists

---
 lib/lists.nix | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/lists.nix b/lib/lists.nix
index 06cee2eb112a..56af4d9daa18 100644
--- a/lib/lists.nix
+++ b/lib/lists.nix
@@ -629,7 +629,9 @@ rec {
       crossLists (x:y: "${toString x}${toString y}") [[1 2] [3 4]]
       => [ "13" "14" "23" "24" ]
   */
-  crossLists = f: foldl (fs: args: concatMap (f: map f args) fs) [f];
+  crossLists = builtins.trace
+    "lib.crossLists is deprecated, use lib.cartesianProductOfSets instead"
+    (f: foldl (fs: args: concatMap (f: map f args) fs) [f]);
 
 
   /* Remove duplicate elements from the list. O(n^2) complexity.