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-rw-r--r--tvix/glue/src/builtins/derivation.rs4
1 files changed, 3 insertions, 1 deletions
diff --git a/tvix/glue/src/builtins/derivation.rs b/tvix/glue/src/builtins/derivation.rs
index 4eb0141d544b..6eedbc13e7e3 100644
--- a/tvix/glue/src/builtins/derivation.rs
+++ b/tvix/glue/src/builtins/derivation.rs
@@ -247,7 +247,9 @@ pub(crate) mod derivation_builtins {
         // TODO: the JSON serialisation has to happen here.
         if let Some(sa) = input.select(STRUCTURED_ATTRS) {
             if generators::request_force(&co, sa.clone()).await.as_bool()? {
-                return Err(ErrorKind::NotImplemented(STRUCTURED_ATTRS));
+                return Ok(Value::Catchable(CatchableErrorKind::UnimplementedFeature(
+                    STRUCTURED_ATTRS.to_string(),
+                )));
             }
         }