feat(tvix/eval): Validate closed formals r/5154

Validate "closed formals" (formal parameters without an ellipsis) via a
new ValidateClosedFormals op, which checks the arguments (in an attr set
at the top of the stack) against the formal parameters on the Lambda in
the current frame, and returns a new UnexpectedArgument error (including
the span of the formals themselves!!) if any arguments aren't allowed

Change-Id: Idcc47a59167a83be1832a6229f137d84e426c56c
Reviewed-on: https://cl.tvl.fyi/c/depot/+/7002
Reviewed-by: tazjin <tazjin@tvl.su>
Tested-by: BuildkiteCI

1 files changed, 1 insertions, 0 deletions

diff --git a/tvix/eval/src/tests/tvix_tests/eval-fail-closed-formals.nix b/tvix/eval/src/tests/tvix_tests/eval-fail-closed-formals.nix
new file mode 100644
index 000000000000..937604c563e9
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-fail-closed-formals.nix
@@ -0,0 +1 @@
+({x}: x) {x = 1; y = 2;}