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-rw-r--r--lib/attrsets.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/attrsets.nix b/lib/attrsets.nix
index 3615328b1924..cb4091b916c5 100644
--- a/lib/attrsets.nix
+++ b/lib/attrsets.nix
@@ -1,7 +1,7 @@
 # Operations on attribute sets.
 
 with {
-  inherit (builtins) head tail;
+  inherit (builtins) head tail length;
   inherit (import ./trivial.nix) or;
   inherit (import ./default.nix) fold;
   inherit (import ./strings.nix) concatStringsSep;