message: Stop gating feature "edition2021"
diff: @@ -1137,9 +1137,13 @@ impl TomlManifest {
  } else {
  Edition::Edition2015
  };
  - if edition == Edition::Edition2021 {
  - features.require(Feature::edition2021())?;
  - } else if !edition.is_stable() {
  + // Add these lines if start a new unstable edition.
  + // ```
  + // if edition == Edition::Edition20xx {
  + // features.require(Feature::edition20xx))?;
  + // }
  + // ```
  + if !edition.is_stable() {
  // Guard in case someone forgets to add .require()
  return Err(util::errors::internal(format!(
  "edition {} should be gated",
  