fix(tvix/eval): Propagate catchables in NixAttrs::construct r/7492

Correctly propagate the case where the *key* of an attrset is a
Value::Catchable (eg { "${builtins.throw "c"}" = "b"; }) in
`NixAttrs::construct`, by converting the return type to
`Result<Result<Self, CatchableErrorKind>, ErrorKind>` (ugh!!) and
correctly handling that everywhere (including an `expect` in the
Deserialize impl for NixAttrs, since afaict this is impossible to hit
when deserializing from stuff like JSON).

Change-Id: Ic4bc611fbfdab27c0bd8a40759689a87c4004a17
Reviewed-on: https://cl.tvl.fyi/c/depot/+/10786
Reviewed-by: raitobezarius <tvl@lahfa.xyz>
Tested-by: BuildkiteCI

1 files changed, 12 insertions, 6 deletions

diff --git a/tvix/eval/src/value/attrs/tests.rs b/tvix/eval/src/value/attrs/tests.rs
index d7e2f113ebdf..534b78a00d10 100644
--- a/tvix/eval/src/value/attrs/tests.rs
+++ b/tvix/eval/src/value/attrs/tests.rs
@@ -4,7 +4,9 @@ use super::*;
 
 #[test]
 fn test_empty_attrs() {
-    let attrs = NixAttrs::construct(0, vec![]).expect("empty attr construction should succeed");
+    let attrs = NixAttrs::construct(0, vec![])
+        .expect("empty attr construction should succeed")
+        .unwrap();
 
     assert!(
         matches!(attrs, NixAttrs(AttrsRep::Empty)),
@@ -15,7 +17,8 @@ fn test_empty_attrs() {
 #[test]
 fn test_simple_attrs() {
     let attrs = NixAttrs::construct(1, vec![Value::from("key"), Value::from("value")])
-        .expect("simple attr construction should succeed");
+        .expect("simple attr construction should succeed")
+        .unwrap();
 
     assert!(
         matches!(attrs, NixAttrs(AttrsRep::Im(_))),
@@ -39,7 +42,8 @@ fn test_kv_attrs() {
             meaning_val.clone(),
         ],
     )
-    .expect("constructing K/V pair attrs should succeed");
+    .expect("constructing K/V pair attrs should succeed")
+    .unwrap();
 
     match kv_attrs {
         NixAttrs(AttrsRep::KV { name, value })
@@ -55,7 +59,7 @@ fn test_kv_attrs() {
 
 #[test]
 fn test_empty_attrs_iter() {
-    let attrs = NixAttrs::construct(0, vec![]).unwrap();
+    let attrs = NixAttrs::construct(0, vec![]).unwrap().unwrap();
     assert!(attrs.iter().next().is_none());
 }
 
@@ -75,7 +79,8 @@ fn test_kv_attrs_iter() {
             meaning_val.clone(),
         ],
     )
-    .expect("constructing K/V pair attrs should succeed");
+    .expect("constructing K/V pair attrs should succeed")
+    .unwrap();
 
     let mut iter = kv_attrs.iter().collect::<Vec<_>>().into_iter();
     let (k, v) = iter.next().unwrap();
@@ -90,7 +95,8 @@ fn test_kv_attrs_iter() {
 #[test]
 fn test_map_attrs_iter() {
     let attrs = NixAttrs::construct(1, vec![Value::from("key"), Value::from("value")])
-        .expect("simple attr construction should succeed");
+        .expect("simple attr construction should succeed")
+        .unwrap();
 
     let mut iter = attrs.iter().collect::<Vec<_>>().into_iter();
     let (k, v) = iter.next().unwrap();