fix(tvix/eval): fix b/281 by adding Value::Catchable r/6650

This commit makes catchable errors a variant of Value.

The main downside of this approach is that we lose the ability to
use Rust's `?` syntax for propagating catchable errors.

Change-Id: Ibe89438d8a70dcec29e016df692b5bf88a5cad13
Reviewed-on: https://cl.tvl.fyi/c/depot/+/9289
Reviewed-by: tazjin <tazjin@tvl.su>
Autosubmit: Adam Joseph <adam@westernsemico.com>
Tested-by: BuildkiteCI

1 files changed, 1 insertions, 0 deletions

diff --git a/tvix/serde/src/de.rs b/tvix/serde/src/de.rs
index 59a72b7417f9..2e8a9618e637 100644
--- a/tvix/serde/src/de.rs
+++ b/tvix/serde/src/de.rs
@@ -109,6 +109,7 @@ impl<'de> de::Deserializer<'de> for NixDeserializer {
             | Value::DeferredUpvalue(_)
             | Value::UnresolvedPath(_)
             | Value::Json(_)
+            | Value::Catchable(_)
             | Value::FinaliseRequest(_) => Err(Error::Unserializable {
                 value_type: self.value.type_of(),
             }),