From e5e33611d75b333492221e407e485a7dbfb438aa Mon Sep 17 00:00:00 2001
From: Ryan Lahfa <tvl@lahfa.xyz>
Date: Wed, 10 Jan 2024 23:26:36 +0100
Subject: fix(tvix/eval): catchable-aware `elem`

`elem` did not catch the list being a catchable.
This surfaced during Nixpkgs evaluation.

Change-Id: Icf19b94e914e35a435c4412d769ee63ba59ab7b0
Reviewed-on: https://cl.tvl.fyi/c/depot/+/10599
Reviewed-by: flokli <flokli@flokli.de>
Tested-by: BuildkiteCI
---
 tvix/eval/src/builtins/mod.rs | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tvix/eval/src/builtins/mod.rs b/tvix/eval/src/builtins/mod.rs
index 2070f6591e..eb24c0559f 100644
--- a/tvix/eval/src/builtins/mod.rs
+++ b/tvix/eval/src/builtins/mod.rs
@@ -397,6 +397,10 @@ mod pure_builtins {
 
     #[builtin("elem")]
     async fn builtin_elem(co: GenCo, x: Value, xs: Value) -> Result<Value, ErrorKind> {
+        if xs.is_catchable() {
+            return Ok(xs);
+        }
+
         for val in xs.to_list()? {
             match generators::check_equality(&co, x.clone(), val, PointerEquality::AllowAll).await?
             {
-- 
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