I followed @cdepillabout’s suggestion and made another short video that demonstrates how to run hackage2nix to update the Haskell package set in Nixpkgs. This is pretty much what the automated process for the haskell-updates branch [1, 2] does once per night. Check out the video at:
Best regards,
Peter
[1] https://hydra.nixos.org/jobset/nixpkgs/haskell-updates
[2] GitHub - NixOS/nixpkgs at haskell-updates