module RuboCop::Cop::ParserDiagnostic

def investigate(processed_source)
  processed_source.diagnostics.each do |d|
    next unless relevant_diagnostic?(d)
    message = if respond_to?(:alternative_message, true)
                alternative_message(d)
              else
                d.message.capitalize
              end
    add_offense(nil, d.location, message, d.level)
  end
end