@lverns, thanks for your PR! By analyzing the history of the files in this pull request, we identified @peti, @obadz and @pikajude to be potential reviewers.

I merged ae6c7352aa2881bc56550b2150d979b59053616a, f257c5f4d75eb27c502b16f5d4f4cb856abb23e2, and 9bd7d4a443c398985dc18a63c33989416a8f182b to haskell-updates. I'll merge to master once the test builds at http://hydra.nixos.org/jobset/nixpkgs/haskell-updates are through.

This patch doesn't seem to work (for ghc 8.0.1). I just looked at ghc in revision
fd42555d32dad10cea70d09fbccc07ce6477919c of haskell-updates, and there's no man page:

$ nix-build --no-out-link "<nixpkgs>" -A ghc 
/nix/store/92i3gzgmrr8whpmln9i81xdzsbcx4pa5-ghc-8.0.1
$ tree /nix/store/92i3gzgmrr8whpmln9i81xdzsbcx4pa5-ghc-8.0.1/share/
/nix/store/92i3gzgmrr8whpmln9i81xdzsbcx4pa5-ghc-8.0.1/share/
└── bash-completion
    └── completions
        └── ghc

2 directories, 1 file

8.0.2 has no man page either:

$ nix-build --no-out-link "<nixpkgs>" -A haskell.compiler.ghc802
/nix/store/b63hrp0sanr0wrddg7kvmvzxsa272lq1-ghc-8.0.1.20161213
$ tree /nix/store/b63hrp0sanr0wrddg7kvmvzxsa272lq1-ghc-8.0.1.20161213/share/
/nix/store/b63hrp0sanr0wrddg7kvmvzxsa272lq1-ghc-8.0.1.20161213/share/
└── bash-completion
    └── completions
        └── ghc

Am I missing something?

For reasons that aren't particularly clear to me, the man pages and HTML documentation go into the 'doc' output. If you look at the tail end of the output from your build commands, you should see reference to it. Currently, when one uses nix-env to install a package with multiple outputs, they all get installed. So nix-env -iA ghc would bring the man pages and the binaries into the user's profile.

Ah, good point. That explains it.