Yeah:
```
$ home-manager switch
error: --- EvalError -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- nix-build
at: (26:28) in file: /home/tad/.nix-defexpr/channels/home-manager/modules/programs/matplotlib.nix

    25|       default = { };
    26|       type = types.attrsOf types.anything;
      |                            ^
    27|       description = ''

attribute 'anything' missing
(use '--show-trace' to show detailed location information)
```