1 files changed, 15 insertions, 0 deletions

diff --git a/bin/tests/data/faster_groupby.nix b/bin/tests/data/faster_groupby.nix
new file mode 100644
index 0000000..30d1031
--- /dev/null
+++ b/bin/tests/data/faster_groupby.nix
@@ -0,0 +1,15 @@
+{
+  # trivial case
+  _ = lib.groupBy (x: if x > 2 then "big" else "small") [ 1 2 3 4 5 ];
+
+  # offer lint heuristically on this too
+  _ = nixpkgs.lib.groupBy (x: if x > 2 then "big" else "small") [ 1 2 3 4 5 ];
+
+  # do not lint on `builtins`
+  _ = builtins.groupBy (x: x.name) [
+    { name = "foo"; idx = 1; }
+    { name = "foo"; idx = 2; }
+    { name = "bar"; idx = 1; }
+    { name = "bar"; idx = 2; }
+  ];
+}