GHC 7.8.1: Many haddock-related complaints from 'ghc-pkg check'

[Conal Elliott]

I installed the binary distribution of GHC 7.8.1 for Mac OS this morning,
cabal-installed a few packages, and now I get a *lot* of warnings about
missing .haddock files:

    bash-3.2$ ghc-pkg check
    Warning: haddock-interfaces:
/Users/conal/.cabal/share/doc/x86_64-osx-ghc-7.8.1/uniplate-1.6.12/html/uniplate.haddock
doesn't exist or isn't a file
    Warning: haddock-interfaces:
/Users/conal/.cabal/share/doc/x86_64-osx-ghc-7.8.1/polyparse-1.9/html/polyparse.haddock
doesn't exist or isn't a file
    Warning: haddock-interfaces:
/Users/conal/.cabal/share/doc/x86_64-osx-ghc-7.8.1/ghc-syb-utils-0.2.1.2/html/ghc-syb-utils.haddock
doesn't exist or isn't a file
    Warning: haddock-interfaces:
/Users/conal/.cabal/share/doc/x86_64-osx-ghc-7.8.1/constraints-0.3.5/html/constraints.haddock
doesn't exist or isn't a file
    Warning: haddock-html:
/Users/conal/.cabal/share/doc/x86_64-osx-ghc-7.8.1/constraints-0.3.5/html
doesn't exist or isn't a directory
    Warning: haddock-interfaces:
/Users/conal/.cabal/share/doc/x86_64-osx-ghc-7.8.1/newtype-0.2/html/newtype.haddock
doesn't exist or isn't a file
    Warning: haddock-html:
/Users/conal/.cabal/share/doc/x86_64-osx-ghc-7.8.1/newtype-0.2/html doesn't
exist or isn't a directory
    ...

Expected behavior? Avoidable? Fixable?

Thanks,  - Conal
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