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-rw-r--r--tvix/glue/src/builtins/derivation.rs4
1 files changed, 2 insertions, 2 deletions
diff --git a/tvix/glue/src/builtins/derivation.rs b/tvix/glue/src/builtins/derivation.rs
index a7742ae40a66..7878ce0ed9ad 100644
--- a/tvix/glue/src/builtins/derivation.rs
+++ b/tvix/glue/src/builtins/derivation.rs
@@ -372,12 +372,12 @@ pub(crate) mod derivation_builtins {
                             return Ok(val);
                         }
 
-                        let (val_json, mut context) = match val.into_contextful_json(&co).await? {
+                        let (val_json, context) = match val.into_contextful_json(&co).await? {
                             Ok(v) => v,
                             Err(cek) => return Ok(Value::from(cek)),
                         };
 
-                        input_context = input_context.join(&mut context);
+                        input_context.extend(context.into_iter());
 
                         // No need to check for dups, we only iterate over every attribute name once
                         structured_attrs.insert(arg_name.to_owned(), val_json);