zed-industries/zed · error

output dir is required

Error message

output dir is required

What it means

For the `synthesize` subcommand, when no `--output` is given the CLI defaults to `<cwd>/crates/edit_prediction_cli/evals-generated`. It checks that the parent of that default (`<cwd>/crates/edit_prediction_cli`) exists — true only when running from the Zed repo root. Otherwise it panics with 'output dir is required' rather than writing to an arbitrary location.

Source

Thrown at crates/edit_prediction_cli/src/main.rs:1151

            use strum::IntoEnumIterator as _;
            for format in ZetaFormat::iter() {
                println!("{}", format.to_string().to_lowercase());
            }
            return;
        }

        Command::Synthesize(synth_args) => {
            let output_dir = if let Some(output_dir) = args.output {
                output_dir
            } else {
                let default_output_dir = env::current_dir()
                    .unwrap()
                    .join("crates/edit_prediction_cli/evals-generated");
                if default_output_dir.parent().unwrap().exists() {
                    std::fs::create_dir(&default_output_dir).ok();
                    default_output_dir
                } else {
                    panic!("output dir is required");
                }
            };
            let config = SynthesizeConfig {
                repo_urls: synth_args.repos.clone(),
                count: synth_args.count,
                max_commits: synth_args.max_commits,
                output_dir,
                fresh: synth_args.fresh,
            };
            gpui::block_on(async {
                if let Err(e) = run_synthesize(config).await {
                    eprintln!("Error: {:?}", e);
                    std::process::exit(1);
                }
            });
            return;
        }
        Command::SplitCommit(split_commit_args) => {

View on GitHub (pinned to f4178619ac)

Solutions

1. Pass an explicit output directory: `--output /path/to/dir`
2. Or run the command from the Zed repository root so the default path exists
3. Verify the cwd with `pwd` before invoking if relying on the default

Example fix

# before (run from ~)
synthesize --repos https://github.com/a/b  # panic: output dir is required

# after
synthesize --repos https://github.com/a/b --output ~/evals-generated

// shell: verify default target exists before relying on it
crates/edit_prediction_cli/evals-generated 2>/dev/null || test -d crates/edit_prediction_cli \
  || { echo "run from repo root or pass --output"; exit 1; }

When it happens

Trigger: Running the synthesize command from any directory other than the Zed repository root without passing `--output`.

Common situations: Building/running the edit_prediction_cli binary standalone or from a scripts directory and forgetting the output flag.

Understand the failure class

Background: "Must pass :limit option" / "Missing required option" — required option errors explained — this error's family across 41 libraries.

Related errors

• --in-place requires exactly one input file
• {} has invalid example extension `{ext}`
• Cannot format prompt for {:?}
• Fatal error: {:?}
• prompt file not found: {name}

AI-assisted analysis of zed-industries/zed@f4178619ac (2026-08-20). Data as JSON: /api/errors/edfe6e78fdad4c59. Report an issue: GitHub.