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-rw-r--r--lib/customisation.nix3
1 files changed, 2 insertions, 1 deletions
diff --git a/lib/customisation.nix b/lib/customisation.nix
index 32bc1b34683..fb78335ea1c 100644
--- a/lib/customisation.nix
+++ b/lib/customisation.nix
@@ -157,7 +157,8 @@ rec {
 
   /* Add attributes to each output of a derivation without changing
      the derivation itself. */
-  addPassthru = extendDerivation true;
+  addPassthru = lib.warn "`addPassthru` is deprecated, replace with `extendDerivation true`"
+                         (extendDerivation true);
 
   /* Strip a derivation of all non-essential attributes, returning
      only those needed by hydra-eval-jobs. Also strictly evaluate the