From 174b3ee6bef292d3270823006f806f847dc5a264 Mon Sep 17 00:00:00 2001
From: tv <tv@krebsco.de>
Date: Sat, 16 Feb 2019 15:39:17 +0100
Subject: [PATCH] lib.warnOldVersion: init

---
 lib/default.nix | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/lib/default.nix b/lib/default.nix
index 347830e8c..75086f864 100644
--- a/lib/default.nix
+++ b/lib/default.nix
@@ -145,6 +145,11 @@ let
     in
       filter (x: x != []) ([acc.chunk] ++ acc.chunks);
 
+    warnOldVersion = oldName: newName:
+      if compareVersions oldName newName != -1 then
+        trace "Upstream `${oldName}' gets overridden by `${newName}'." newName
+      else
+        newName;
   };
 in