# File lib/pry/commands/edit/file_and_line_locator.rb, line 9
        def from_code_object(code_object, filename_argument)
          if File.exists?(code_object.source_file.to_s)
            [code_object.source_file, code_object.source_line]
          else
            raise CommandError, "Cannot find a file for #{filename_argument}!"
          end
        end