# File lib/bundler/cli.rb, line 548
    def exec(*args)
      Bundler.definition.validate_ruby!
      Bundler.load.setup_environment

      begin
        if RUBY_VERSION >= "2.0"
          args << { :close_others => !options.keep_file_descriptors? }
        elsif options.keep_file_descriptors?
          Bundler.ui.warn "Ruby version #{RUBY_VERSION} defaults to keeping non-standard file descriptors on Kernel#exec."
        end

        # Run
        Kernel.exec(*args)
      rescue Errno::EACCES
        Bundler.ui.error "bundler: not executable: #{args.first}"
        exit 126
      rescue Errno::ENOENT
        Bundler.ui.error "bundler: command not found: #{args.first}"
        Bundler.ui.warn  "Install missing gem executables with `bundle install`"
        exit 127
      rescue ArgumentError
        Bundler.ui.error "bundler: exec needs a command to run"
        exit 128
      end
    end