route_source_location

# File actionpack/lib/action_dispatch/routing/mapper.rb, line 379
            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