zed-industries/zed · error

Failed to send to output writer

Error message

Failed to send to output writer

What it means

Panics when sending an example's serialized line to the output-writer task via the mpsc channel fails — the writer task has shut down (e.g. after a prior write error), so remaining examples cannot be recorded.

Source

Thrown at crates/edit_prediction_cli/src/main.rs:1449

                                    false
                                };

                                let should_write = !failed || args.failed == FailedHandling::Keep;
                                if should_write {
                                    if args.markdown {
                                        let markdown_dir =
                                            output.as_ref().expect("--markdown requires -o");
                                        let filename = format!("{}.md", example.spec.filename());
                                        let path = markdown_dir.join(&filename);
                                        let markdown = example.spec.to_markdown();
                                        std::fs::write(&path, &markdown)
                                            .expect("Failed to write markdown file");
                                    } else if let Some(ref mut sender) = output_sender.clone() {
                                        let line = serde_json::to_string(&example).unwrap();
                                        sender
                                            .send(line)
                                            .await
                                            .expect("Failed to send to output writer");
                                    } else if args.output.is_none()
                                        && !matches!(command, Command::Eval(_))
                                    {
                                        let line = serde_json::to_string(&example).unwrap();
                                        println!("{}", line);
                                    }
                                }
                            }

                            let project = repo_examples
                                .iter()
                                .find_map(|e| e.state.as_ref().map(|s| s.project.clone()));

                            if let Some(project) = project {
                                let mut cx = cx.clone();

                                let shutdown_task: Task<()> =
                                    project.update(&mut cx, |project, cx| {

View on GitHub (pinned to f4178619ac)

Solutions

1. Look earlier in the log for the writer task's underlying I/O error
2. Re-run with resume to repopulate the output file
3. Avoid killing the process mid-write

When it happens

Trigger: Thrown at crates/edit_prediction_cli/src/main.rs:1449 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/eab7b0f22f1effbd. Report an issue: GitHub.