Incompatibility between runner aarch64-darwin-3_aarch64-darwin-3_855e630771e1 and experimental Nix commands
This is runner https://gitlab.haskell.org/admin/runners/598.
Error example: https://gitlab.haskell.org/ghc/ghc/-/jobs/1249366 .
I have paused the runner to avoid future conflict.
Ah, I see the runner is brand new, so perhaps it's not due to any changes in CI, but use of a different Nix on the system?