Bug#1014021: haskell-ghc-mtl FTBFS: error: Could not find module

[Adrian Bunk]

Source: haskell-ghc-mtl
Version: 1.2.1.0-10
Severity: serious
Tags: ftbfs bookworm sid

https://buildd.debian.org/status/package.php?p=haskell-ghc-mtl&suite=sid

...
Control/Monad/Ghc.hs:22:1: error:
    Could not find module ‘MonadUtils’
    Use -v (or `:set -v` in ghci) to see a list of the files searched for.
   |
22 | import qualified MonadUtils as GHC
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Control/Monad/Ghc.hs:23:1: error:
    Could not find module ‘Exception’
    Use -v (or `:set -v` in ghci) to see a list of the files searched for.
   |
23 | import qualified Exception  as GHC
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Control/Monad/Ghc.hs:25:1: error:
    Could not find module ‘GhcMonad’
    Use -v (or `:set -v` in ghci) to see a list of the files searched for.
   |
25 | import qualified GhcMonad   as GHC
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Control/Monad/Ghc.hs:31:1: error:
    Could not find module ‘DynFlags’
    Use -v (or `:set -v` in ghci) to see a list of the files searched for.
   |
31 | import qualified DynFlags as GHC
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 at /usr/share/perl5/Debian/Debhelper/Buildsystem/Haskell/Recipes.pm line 107.
	Debian::Debhelper::Buildsystem::Haskell::Recipes::run_quiet("debian/hlibrary.setup", "haddock", "--builddir=dist-ghc", "--with-haddock=/usr/bin/haddock", "--with-ghc=ghc", "--verbose=2", "--html", "--hoogle", ...) called at /usr/share/perl5/Debian/Debhelper/Buildsystem/Haskell/Recipes.pm line 131
	Debian::Debhelper::Buildsystem::Haskell::Recipes::run("debian/hlibrary.setup", "haddock", "--builddir=dist-ghc", "--with-haddock=/usr/bin/haddock", "--with-ghc=ghc", "--verbose=2", "--html", "--hoogle", ...) called at /usr/share/perl5/Debian/Debhelper/Buildsystem/Haskell/Recipes.pm line 707
	Debian::Debhelper::Buildsystem::Haskell::Recipes::haddock_recipe() called at -e line 1
make: *** [/usr/share/cdbs/1/class/hlibrary.mk:153: build-ghc-stamp] Error 25