ghc and the hs-packages now simply include the necessary (haskell)
package description files in lib/ghc/package.conf.d and update the
package.cache by running ghc-pkg recache at the end. register and
unregister scripts are no longer needed.
and the line with the unregister.sh script down to the bottom of
the plist. Silences all the blurb about ".../*.haddock doesn't exist
or isn't a file."
for unregister.sh in all the new ghc libraries (which leads to bogus
registered ghc packages after updates).
You can use the command
ghc-pkg check
to check ghcs internal package list. If it reports missing files
for some package (like hashed-storage-0.4.11), you can forcibly
unregister it by running (as root) something like
ghc-pkg unregister hashed-storage-0.4.11
ok dcoppa@
