[nc@varda:~/nixpkgs.hask-split-out]$  nix-shell -p "haskellPackages.ghcWithPackages (ps: [ps.turtle])" -I .

[nix-shell:~/nixpkgs.hask-split-out]$ ghci 
GHCi, version 8.0.2: http://www.haskell.org/ghc/  :? for help
Loaded GHCi configuration from /home/nc/.ghc/ghci.conf
λ> import Turtle
(0.08 secs, 0 bytes)

[nc@varda:~/nixpkgs.hask-split-out]$  nix-shell -p "haskellPackages.ghcWithHoogle (ps: [ps.turtle])" -I .

[nix-shell:~/nixpkgs.hask-split-out]$ hoogle "MonadIO io => Shell a -> FoldM IO a r -> io r"
Turtle.Shell foldIO :: MonadIO io => Shell a -> FoldM IO a r -> io r
Turtle.Bytes shellStrictWithErr :: MonadIO io => Text -> Shell ByteString -> io (ExitCode, ByteString, ByteString)
Turtle.Bytes procStrict :: MonadIO io => Text -> [Text] -> Shell ByteString -> io (ExitCode, ByteString)
Turtle.Bytes procStrictWithErr :: MonadIO io => Text -> [Text] -> Shell ByteString -> io (ExitCode, ByteString, ByteString)
CoreMonad liftIO2 :: MonadIO m => (a -> b -> IO c) -> a -> b -> m c
MonadUtils liftIO2 :: MonadIO m => (a -> b -> IO c) -> a -> b -> m c
CoreMonad liftIO3 :: MonadIO m => (a -> b -> c -> IO d) -> a -> b -> c -> m d
MonadUtils liftIO3 :: MonadIO m => (a -> b -> c -> IO d) -> a -> b -> c -> m d
Data.StateVar ($~) :: (HasUpdate t a b, MonadIO m) => t -> (a -> b) -> m ()
Data.StateVar ($~!) :: (HasUpdate t a b, MonadIO m) => t -> (a -> b) -> m ()
-- plus more results not shown, pass --count=20 to see more

[nc@varda:~/nixpkgs.hask-split-out]$ nix-shell -p "haskellPackages.ghcWithPackages (ps: [ps.conduit])" -I .

[nix-shell:~/nixpkgs.hask-split-out]$ ghci
GHCi, version 8.0.2: http://www.haskell.org/ghc/  :? for help
Loaded GHCi configuration from /home/nc/.ghc/ghci.conf
λ> import Data.Conduit
(0.02 secs, 0 bytes)

$ git show           
commit 9f90700b564f35caa4ca28aa8d56cfffd4d1ae6f (HEAD -> up, upstream/master)
Merge: fd7953d95f4 62e6f2eb1dc
Author: Jörg Thalheim <[email protected]>
Date:   Tue Dec 5 10:47:55 2017 +0000

    Merge pull request #32336 from Mic92/vim-codefmt
    
    vim-codefmt: init at 2017-03-04

$ NIX_PATH=nixpkgs=. nix-shell -p "haskellPackages.ghcWithPackages (ps: [ps.conduit])"             

[nix-shell:~/dev/nixpkgs-upstream]$ ghci
GHCi, version 8.0.2: http://www.haskell.org/ghc/  :? for help
Prelude> import Data.Conduit
Prelude Data.Conduit> 

There are problems in package conduit-1.2.12.1:
  dependency "exceptions-0.8.3-ADEDRATtUrMK1JW4zMQ9U" doesn't exist
  dependency "lifted-base-0.2.3.11-Ei0JSPdt7KOCD2HIA5jFqV" doesn't exist
  dependency "mmorph-1.0.9-5bASEvmIkr5CpdAYXwPsn0" doesn't exist
  dependency "monad-control-1.0.2.2-1Ci8dYJ8Tb7E3HTcTqOb8l" doesn't exist
  dependency "mtl-2.2.1-BLKBelFsPB3BoFeSWSOYj6" doesn't exist
  dependency "primitive-0.6.2.0-4578caNkWQ54Gt1mxLF2Yh" doesn't exist
  dependency "resourcet-1.1.9-L2BUQrxWZMwDiwhcuyPuNi" doesn't exist
  dependency "transformers-base-0.4.4-GKSs0LKukAL8ymq2naFmrH" doesn't exist
  dependency "transformers-compat-0.5.1.4-IuFogs8HAVUJBWVNMhtssu" doesn't exist

The following packages are broken, either because they have a problem
listed above, or because they depend on a broken package.
conduit-1.2.12.1
builder for '/nix/store/vc9453svk0na3w237x6zvbsia0qph9j0-ghc-8.0.2-with-packages.drv' failed with exit code 1