[Nix-dev] Using hdevtools in haskellng infrastructure

[Dmitry Malikov]

Hey guys,

There is a paragraph "Local use via myEnvFun" at "Haskell" page
<https://nixos.org/wiki/Haskell#Local_use_via_myEnvFun> describing
so-called 'myEnvFun' flow and how it could be used for building an isolated
development environment with bunch of utilities like 'hdevtools' and some
others.

Despite the fact that there should be
"pkgs.haskellPackages.ghcWithPackagesOld" used instead of
"pkgs.haskellPackages.ghcWithPackages", this method have been working
properly providing adequate environment for tools like hdevtools.

There is a comment at the page added
<https://nixos.org/w/index.php?title=Haskell&diff=24023&oldid=24000> by
Goibhniu at February 28th saying "Warning: this is outdated. It is
recommended to use nix-shell instead of myEnvFun". And this comment seems
to be very legit, because in this new infrastructure hdevtools doesn't see
any installed modules any more
<https://gist.githubusercontent.com/dmalikov/8baef56b0e599037d454/raw/adcc78e9f1ecccb1ba937c717b22cdb94d7d0790/gistfile1.txt>
.

How to use hdevtools in haskellng infrastructure?
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