Hi Mateusz,
> With old Haskell setup we'd essentially have a shell.nix that was a bit like
>
> let
> pkgs = import <nixpkgs> {}
> some_stuff = …;
> in some_stuff.callPackage ./. {};
>
> or some variation thereof. This allowed us to both nix-shell *and*
> nix-build shell.nix out of the box. But with haskell-ng we end up with
>
> (some_stuff.callPackage ./. {}).env;
>
> which is all fine and dandy for when we want a shell but nix-build no
> longer Just Works™.
just omit the ".env" part from the expression above. Then running
$ nix-build shell.nix
will build the package, and
$ nix-shell -A env
will give you an interactive environment.
Best regards,
Peter
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