[Nix-dev] nix-shell for a custom haskell library

[Dmitry Malikov]

I'm trying to setup a development environment for a custom haskell library
basing on a tutorial by Oliver Charles (http://wiki.ocharles.org.uk/Nix).

So, here is a `shell.nix` of engine-io package
with (import <nixpkgs> {}).pkgs;
(haskellngPackages.callPackage ./. {}).env

After I did `nix-shell` engine-io package is not actually installed inside
this shell:
>> ghc-pkg list | grep engine
>>

How to get Network.EngineIO available inside a nix-shell in this case?
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