{"ast_node_type":"other","tokens":[{"end":99,"kind":"keyword","start":0,"text":"///"}]}
    /// Allows `union` fields that don't implement `Copy` as long as they don't have any drop glue.
     Some("The feature restricts possible layouts for tuples, and this restriction is not worth it."), 137728),
    (removed, untagged_unions, "1.64.0", Some(55149),