From 0f71d8f813adad2d8bf4cc3048adb7fb60f5a1f8 Mon Sep 17 00:00:00 2001 From: sterni Date: Wed, 7 Jun 2023 16:08:37 +0200 Subject: test(tvix/eval): genericClosure (pointer) comparison support genericClosure has very limited support for pointer equality: It relies on comparison (not equality!) in C++ Nix, so as soon as C++ Nix supports comparing lists (langVersion >= 6) we can rely on pointer equality for key. Since Tvix uses equality, not comparison for the insert, our behavior is currently different, as documented by the notyetpassing tests. Change-Id: Ifcd741ed4fc3ccc3825f7038875d56a9918b786a Reviewed-on: https://cl.tvl.fyi/c/depot/+/8720 Tested-by: BuildkiteCI Autosubmit: sterni Reviewed-by: tazjin --- ...eval-okay-builtins-genericClosure-pointer-equality.nix | 15 +++++++++++++++ 1 file changed, 15 insertions(+) create mode 100644 tvix/eval/src/tests/tvix_tests/eval-okay-builtins-genericClosure-pointer-equality.nix (limited to 'tvix/eval/src/tests/tvix_tests/eval-okay-builtins-genericClosure-pointer-equality.nix') 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 000000000000..5e662cdaf75e --- /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? πŸ₯ΊπŸ‘‰πŸ‘ˆ"; } + ]; +} -- cgit 1.4.1