zed-industries/zed · error

Failed to open output file

Error message

Failed to open output file

What it means

A panic in the edit-prediction CLI when opening the output file (or the in-place .jsonl.tmp temp file) with the configured create/write/truncate/append flags fails — e.g. permission denied or a bad path. The results writer cannot be set up, so the run aborts.

Source

Thrown at crates/edit_prediction_cli/src/main.rs:1276

                let mut in_place_temp_path: Option<PathBuf> = None;
                if !args.markdown
                    && let Some(output_path) = output.as_ref()
                {
                    let write_path = if args.in_place {
                        let temp = output_path.with_extension("jsonl.tmp");
                        in_place_temp_path = Some(temp.clone());
                        temp
                    } else {
                        output_path.clone()
                    };

                    let file = OpenOptions::new()
                        .create(true)
                        .write(true)
                        .truncate(args.in_place)
                        .append(!args.in_place)
                        .open(&write_path)
                        .expect("Failed to open output file");

                    let mut writer = BufWriter::new(file);
                    let (sender, mut receiver) = mpsc::unbounded::<String>();
                    cx.background_spawn(async move {
                        while let Some(line) = receiver.next().await {
                            writeln!(writer, "{}", line).expect("Failed to write example");
                            writer.flush().expect("Failed to flush output");
                        }
                    })
                    .detach();
                    output_sender = Some(sender);
                }

                let example_batches = if args.group_by_repo {
                    group_examples_by_repo(examples)
                } else {
                    chunk_examples(examples, args.max_parallelism)
                };

View on GitHub (pinned to f4178619ac)

Solutions

1. Check the output path is writable and its directory exists
2. Ensure no other process locks the output file
3. For in-place runs, verify the temp `.jsonl.tmp` file can be created

When it happens

Trigger: Thrown at crates/edit_prediction_cli/src/main.rs:1276 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of zed-industries/zed@f4178619ac (2026-08-20). Data as JSON: /api/errors/b770d5b3b7ba672a. Report an issue: GitHub.