anchor.diff:  
     """Represents a 'locked' event on a given issue or pull request."""
     LOCKED_EVENT
  +
  +  """
  +  Represents a 'marked_as_duplicate' event on a given issue or pull request.
  +  """
  +  MARKED_AS_DUPLICATE_EVENT
   
     """Represents a 'mentioned' event on a given issue or pull request."""
     MENTIONED_EVENT
  
positive.code: """Used for return value of Repository.issueOrPullRequest."""
  union IssueOrPullRequest = Issue | PullRequest
  
  """The possible PubSub channels for an issue."""
  enum IssuePubSubTopic {
    """The channel ID for observing issue updates."""
  
negative.code: """
  A user is an individual's account on GitHub that owns repositories and can make new content.
  """
  type User implements Node & Actor & RegistryPackageOwner & RegistryPackageSearch & ProjectOwner & RepositoryOwner & UniformResourceLocatable & ProfileOwner & Sponsorable {
    """
    Determine if this repository owner has any items that can be pinned to their profile.
    """
  