Installing only 'ghc 8.6.5' (Glasgow Haskell compiler) and sourcing
'~/.guix-profile/etc/profile' leads to ghc not finding core modules.
('ghci' doesn't find System.IO for instance).
This is due to $GHC_PACKAGE_PATH not containing ghc 8.6.5's
package.conf.d, but
instead ghc 8.4.3's database.
Note: Not setting this variable leads to a working ghc (will search in
default
location), but is required to install additional packages via guix.
The issue might come from guix/profiles.scm:812, since
(module-ref (resolve-interface '(gnu packages haskell)) 'ghc)
evaluates to <package ghc@8.4.3 gnu/packages/haskell.scm:445> in my repl.
