2 files changed, 14 insertions, 0 deletions
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-repeated-list-to-attrs.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-repeated-list-to-attrs.exp
new file mode 100644
index 000000000000..b4a1e66d6b8a
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-repeated-list-to-attrs.exp
@@ -0,0 +1 @@
+[ 1 2 ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-repeated-list-to-attrs.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-repeated-list-to-attrs.nix
new file mode 100644
index 000000000000..2f719dcef5be
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-repeated-list-to-attrs.nix
@@ -0,0 +1,13 @@
+# Ensure that builtins.listToAttrs returns the first instance of a key.
+
+let
+  inherit (builtins) foldl' listToAttrs;
+
+  input = [ { name = "result"; value = 1; } { name = "result"; value = 2; } ];
+
+  # foldl-based version of listToAttrs with the _opposite_ behaviour.
+  listToAttrs' = list: foldl' ( acc: elem: acc // { ${elem.name} = elem.value; }) {} list;
+in [
+  (listToAttrs input).result
+  (listToAttrs' input).result
+]