[Nix-dev] extension error?

[Charles Strahan]

Hi Tim,

It looks like you're using the latest from the stabe 14.04 release, which
doesn't support the `extension` argument:

https://github.com/NixOS/nixpkgs/blob/release-14.04/pkgs/top-level/haskell-defaults.nix#L230-237

Compare that to master:

https://github.com/NixOS/nixpkgs/blob/master/pkgs/top-level/haskell-defaults.nix#L148-155

You can see your current channel running:

    sudo nix-channel --list

I would suggest updating your nixos channel to nixos-14.12 or
nixos-unstable:

    sudo nix-channel --remove nixos
    sudo nix-channel --add https://nixos.org/channels/nixpkgs-unstable nixos
    # ...or...
    sudo nix-channel --add https://nixos.org/channels/nixpkgs-14.12 nixos

(The above commands are assuming that you're using NixOS, as opposed to
using Nix standalone.)

Let me know if that helps!

-Charles

On Mon, Dec 29, 2014 at 12:48 AM, Tim Sears <tim at timsears.com> wrote:

> Was trying this example at
> http://wiki.ocharles.org.uk/Nix#how-do-i-use-cabal2nix-for-local-projects
> and I when I enter nix-shell I an error
>
> $ nix-shell
> error: anonymous function at
> /nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/pkgs/top-level/haskell-defaults.nix:230:5
> called with unexpected argument `extension', at
> /nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/customisation.nix:58
>
> Anybody seen this error or have any insight to share?
>
> Thanks,
> Tim
>
>
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> nix-dev at lists.science.uu.nl
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