> it works well in my preferred mode of operation where I
> build everything locally and never use substitutes.

Do substitutes change the way GC behaves?  I use substitutes.

> (1) update my user profiles and delete old generations
> (2) delete older generations in /var/guix/profiles (but always
>     keeping the one referenced by /run/booted-system!)

You mean system generations?  I did that.

> (3) reconfigure the system to remove the old system profiles from
>     grub.cfg
> (4) guix gc

I did all this.  Then ghc-pandoc and all the ghc dependencies did not go.

Hmm...  I must be missing something.  Or else could there be a bug?

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