# Pastebin kqfnrCHC
i tried adding a top level let with
  xmobar = pkgs.haskell.lib.overrideCabal (pkgs.haskell.lib.justStaticExecutables pkgs.haskell.packages.ghc822 xmobar) (drv: {});

error: anonymous function at /home/bongsun/git/github.com/NixOS/nixpkgs/pkgs/development/haskell-modules/default.nix:1:1 called with unexpected argument 'mkDerivation', at /home/bongsun/git/github.com/NixOS/nixpkgs/lib/customisation.nix:74:12
(use '--show-trace' to show detailed location information)