message: Use Some([header])
diff: @@ -332,10 +332,9 @@ impl RustdocPage {
  result => result.context("error rewriting HTML")?,
  };
  - let robots = if is_latest_url { "" } else { "noindex" };
  Ok((
  StatusCode::OK,
  - [("X-Robots-Tag", robots)],
  + (!is_latest_url).then_some([("X-Robots-Tag", "noindex")]),
  Extension(if is_latest_url {
  CachePolicy::ForeverInCdn
  } else {
  