zed-industries/zed · error

Failed to open failed.jsonl

Error message

Failed to open failed.jsonl

What it means

A panic in the edit-prediction CLI's failure-recording path: opening failed.jsonl in the run directory for append fails (missing RUN_DIR, permissions). The record of the failed example cannot be persisted, so the CLI aborts.

Source

Thrown at crates/edit_prediction_cli/src/main.rs:1662

            .write(
                &failed_example_path,
                &serde_json::to_vec_pretty(&example).unwrap(),
            )
            .await
            .unwrap();
        let err_path = FAILED_EXAMPLES_DIR.join(format!("{}_err.txt", example_name));
        app_state
            .fs
            .write(&err_path, format!("{error:?}").as_bytes())
            .await
            .unwrap();

        let failed_jsonl_path = RUN_DIR.join("failed.jsonl");
        let mut file = OpenOptions::new()
            .create(true)
            .append(true)
            .open(&failed_jsonl_path)
            .expect("Failed to open failed.jsonl");
        writeln!(file, "{}", serde_json::to_string(example).unwrap())
            .expect("Failed to write to failed.jsonl");

        let cursor_path = match example.repo_name() {
            Ok(repo_name) => repo_name.worktree_path().join(&example.spec.cursor_path),
            Err(_) => example.spec.cursor_path.as_ref().to_path_buf(),
        };
        msg = format!(
            indoc::indoc! {"
                While processing \"{}\":

                \x1b[31m{:?}\x1b[0m

                Example:        \x1b[36m{}\x1b[0m
                Error file:     \x1b[36m{}\x1b[0m
                Cursor file:    \x1b[36m{}\x1b[0m
                Re-run:         cargo run -p edit_prediction_cli -- {} \x1b[36m{}\x1b[0m
            "},

View on GitHub (pinned to f4178619ac)

Solutions

1. Verify RUN_DIR exists and is writable (it is created at run start)
2. Check disk space and permissions in the run directory
3. Re-create the run directory if it was deleted mid-run

When it happens

Trigger: Thrown at crates/edit_prediction_cli/src/main.rs:1662 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/56666dcc45f08ac7. Report an issue: GitHub.