Stefan, while this is awesome, do I have to (require 'cl-macs) for this to work properly?

On Tue, Jul 4, 2017 at 2:52 PM, Stefan Monnier <monnier@iro.umontreal.ca> wrote:
>        (if display-line-numbers-current-absolute
>            (setq display-line-numbers-current-absolute nil)
>          (setq display-line-numbers-current-absolute t)))

aka
        (setq display-line-numbers-current-absolute
              (not display-line-numbers-current-absolute))
aka
        (cl-callf not display-line-numbers-current-absolute)


-- Stefan