[Nix-dev] extension error?

[Tim Sears]

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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