Bug#1009883: dh_haskell_install_ghc_registration: does not support directories

[Felix Lechner]

Hi Scott,

> It's not quite clear to me how a directory is supposed to be handled

First off, thank you for your bug reports. I recently rewrote the
Haskell tooling to allow the use of Debhelper's dh sequencer with all
features. Unfortunately, I recently started using another OS and may
not be able to iron out all the kinks in the new code.

As for this bug, I was aware that I broke the directory feature but,
like you, was also not sure right away about how to handle it
properly. The directory feature for package registrations is described
in the documentation. [1]

Kind regards
Felix Lechner

[1] https://downloads.haskell.org/cabal/Cabal-3.0.0.0/doc/users-guide/installing-packages.html#cmdoption-setup-register-gen-pkg-config