You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: deprecation.rb
    path of file: ./repos/dd-trace-rb/spec/datadog/tracing/contrib/rails/support
    
    the code of the file until where you have to start completion: # Raises error when a deprecatio
    
def raise_on_rails_deprecation!
  # DEV: In Rails 6.1 `ActiveSupport::Deprecation.disallowed_warnings`
  #      was introduced that allows fine grain configuration
  #      of which warnings are allowed, in case we need
  #      such feature.
  ActiveSupport::Deprecation.behavior = :raise
end