How to remove warnings about `fold` and `stdenv`

[waffle8946]

How to fix `evaluation warning: 'system' has been renamed to/replaced by 'stdenv.hostPlatform.system'`

This is an antipattern anyway. It should be replaced. Also an antipattern. In NixOS config users should be setting nixpkgs.hostPlatform. No it’s not going to fix this warning, but the underlying reasoning is the same: system does not specify the platform explicitly enough, and passing system to lib.nixosSystem has long been deprecated for the same reason. I expect a warning to eventually come for this antipattern too. I think you mean --option abort-on-warn true --show-trace and tbh it did…