From a bit of experimentation, it appears that the problematic packages do indeed have Haddock failures. For instance,

    bash-3.2$ cd random-1.0.1.1/
    bash-3.2$ cabal configure
    Resolving dependencies...
    Configuring random-1.0.1.1...
    bash-3.2$ cabal haddock
    Running Haddock for random-1.0.1.1...
    Preprocessing library random-1.0.1.1...
    Haddock coverage:

    System/Random.hs:2:2: parse error on input ‘#’

On Wed, Apr 9, 2014 at 10:46 AM, Conal Elliott <conal@conal.net> wrote:

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