class RuboCop::Cop::Style::HashConversion

def single_argument(node)
  first_argument = node.first_argument
  if first_argument.hash_type?
    register_offense_for_hash(node, first_argument)
  elsif first_argument.splat_type?
    add_offense(node, message: MSG_SPLAT) unless allowed_splat_argument?
  elsif use_zip_method_without_argument?(first_argument)
    register_offense_for_zip_method(node, first_argument)
  else
    add_offense(node, message: MSG_TO_H) do |corrector|
      replacement = first_argument.source
      replacement = "(#{replacement})" if requires_parens?(first_argument)
      corrector.replace(node, "#{replacement}.to_h")
    end
  end
end