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: codequality_mr_diff.rb
    path of file: ./repos/gitlabhq/lib/gitlab/ci/reports
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

module Gitlab
  module Ci
    module Reports
      class CodequalityMrDiff
        attr_reader
    
        def build_report!
          codequality_files = @new_errors.each_with_object({}) do |degradation, codequality_files|
            unless codequality_files[degradation.dig(:location, :path)].present?
              codequality_files[degradation.dig(:location, :path)] = []
            end

            build_mr_diff_payload(codequality_files, degradation)
          end