1 files changed, 15 insertions, 0 deletions
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-genericClosure-pointer-equality.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-genericClosure-pointer-equality.nix
new file mode 100644
index 0000000000..f6ca340c09
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-genericClosure-pointer-equality.nix
@@ -0,0 +1,15 @@
+let
+  foo = x: x;
+in
+
+# key needs to be a list since it uses comparison, not equality checks:
+  # lists are comparable in Nix if all non-comparable items in them are equal (e.g.
+  # functions, attribute sets).
+builtins.genericClosure {
+  startSet = [
+    { key = [{ inherit foo; }]; val = null; }
+  ];
+  operator = { val, ... }: if val != null then [ ] else [
+    { key = [{ inherit foo; }]; val = throw "no pointer equality? 🥺👉👈"; }
+  ];
+}