route_source_location

# File actionpack/lib/action_dispatch/routing/mapper.rb, line 373
          def route_source_location
            if Mapper.route_source_locations
              action_dispatch_dir = File.expand_path("..", __dir__)
              Thread.each_caller_location do |location|
                next if location.path.start_with?(action_dispatch_dir)

                cleaned_path = Mapper.backtrace_cleaner.clean_frame(location.path)
                next if cleaned_path.nil?

                return "#{cleaned_path}:#{location.lineno}"
              end
              nil
            end
          end