`override` function no longer accepts parameter, in Python env

Help
1

Hello everyone, how are you?

I’m trying to solve an issue I have in a development environment using mkShell.

In this environment, I set up a development environment with Python packages like this (see Add an "addPackages" utility to python buildEnv by trevorcook · Pull Request #97467 · NixOS/nixpkgs · GitHub):

with import (fetchTarball "channel:nixos-20.03") {};

with python3.pkgs;

let
  env = python3.withPackages(ps: with ps; [ pytest ]);  # Equivalent to the commented `buildEnv.override`
  env2 = env.override (old: {
    extraLibs = old.extraLibs ++ [ numpy ];
  });
in env2

However, the override function no longer accepts this parameter. So I’m unable to add extra packages after the environment is built.

Does anyone have any ideas?

2

What error are you getting?

3

After producing an example outside of flake, I could solve it and sent a pull request fixing the root cause of my error: