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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