1 files changed, 4 insertions, 0 deletions
diff --git a/tvix/eval/src/value/string.rs b/tvix/eval/src/value/string.rs
index 56f9a3f860..aa82ed36eb 100644
--- a/tvix/eval/src/value/string.rs
+++ b/tvix/eval/src/value/string.rs
@@ -322,6 +322,10 @@ impl NixString {
         Self::new_context_from(context, &s.into_boxed_str())
     }
 
+    pub(crate) fn context_mut(&mut self) -> Option<&mut NixContext> {
+        return self.1.as_mut();
+    }
+
     pub fn iter_plain(&self) -> impl Iterator<Item = &str> {
         return self.1.iter().flat_map(|context| context.iter_plain());
     }