Cc-ing Nicolas since he was part of the discussion:
https://lists.gnu.org/archive/html/guix-devel/2019-05/msg00404.html

Efraim Flashner <efraim@flashner.co.il> writes:

> The wrapping is wrong at the very top, it should be under the 'e' in
> define.

You mean the indentation?  I'm not sure what's wrong, could you write a snippet?

> Why core-updates specifically?

Because this rebuilds the world :(

-- 
Pierre Neidhardt
https://ambrevar.xyz/