fix(tvix/eval): wrap asserts in a thunk r/4807

As the new test case demonstrates, asserts need to be evaluated lazily.

Change-Id: I808046722c5a504e9497855ca5026d255c7a4c34
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6494
Tested-by: BuildkiteCI
Reviewed-by: tazjin <tazjin@tvl.su>
Reviewed-by: sterni <sternenseemann@systemli.org>

1 files changed, 8 insertions, 0 deletions

diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-lazy-assert.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-lazy-assert.nix
new file mode 100644
index 000000000000..5a36964976ca
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-lazy-assert.nix
@@ -0,0 +1,8 @@
+assert true;
+
+let
+  x = assert false; 13;
+  y = 12;
+in
+
+{ inherit x y; }.y