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-rw-r--r--tvix/eval/src/builtins/impure.rs3
1 files changed, 2 insertions, 1 deletions
diff --git a/tvix/eval/src/builtins/impure.rs b/tvix/eval/src/builtins/impure.rs
index cf3186ce5087..e01c642e0a4f 100644
--- a/tvix/eval/src/builtins/impure.rs
+++ b/tvix/eval/src/builtins/impure.rs
@@ -38,7 +38,8 @@ mod impure_builtins {
         let dir = generators::request_read_dir(&co, path).await;
         let res = dir.into_iter().map(|(name, ftype)| {
             (
-                NixString::from(name.as_str()),
+                // TODO: propagate Vec<u8> into NixString.
+                NixString::from(String::from_utf8(name).expect("parsing file name as string")),
                 Value::String(
                     match ftype {
                         FileType::Directory => "directory",